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Ph.D. in Soil Chemistry and Solid-state NMR spectroscopy (focused on NMR spectroscopy), University of Massachusetts Amherst, (2000)

M.Sc. in Environmental Chemistry, Nanjing Agricultural University, (1992)

B.S. in Soil Science and Agricultural Chemistry, Nanjing Agricultural University, (1989)

Expertise

Research Interests

Dr. Mao joined the Department of Chemistry and Biochemistry at ������ in 2006. As both a biogeochemist and a solid-state NMR specialist, Dr. Mao's primary research interest is the development and application of advanced solid-state NMR techniques for characterizing two kinds of complex natural organic matter (NOM) samples: (1) environmentally/geochemically-related NOM such as organic matter from soil, water, sediment, and organic wastes, and (2) energy-related organic matter such as kerogen, coal, corn stover and its residues, and biochars. He has developed, modified and applied many advanced solid-state NMR techniques for elucidating NOM structures and proposed a systematic approach to characterizing NOM. Dr. Mao is considered as a pioneer in this area in the world.

Articles

Hua, B., Yang, J., Liu, F., Zhu, G., Deng, B. and Mao, J. (2018). Characterization of dissolved organic matter/nitrogen by fluorescence excitation-emission matrix spectroscopy and X-ray photoelectron spectroscopy for watershed management. Chemosphere 201 , pp. 708-715.

Duan, D., Zhang, D., Ma, X., Yang, Y., Ran, Y. and Mao, J. (2018). Chemical and structural characterization of thermally simulated kerogen and its relationship with microporosity. Marine and Petroleum Geology 89 (1) , pp. 4-13.

Ye, X., Li, H., Wang, Q., Chai, R., Ma, C., Gao, H. and Mao, J. (2018). Influence of aspartic acid and lysine on the uptake of gold nanoparticles in rice. Ecotoxicology and Environmental Safety 148 , pp. 418-425.

Cao, X., Mulholland, M. R., Helms, J. R.., Bernhardt, P. W.., Duan, P., Mao, J. and Schmidt-Rhor, K. (2017). A major step in opening the black box of high-molecular-weight dissolved organic nitrogen by isotopic labeling of synechococcus and multibond two-dimensional NMR. Analytical Chemistry , pp. 9.

Mao, J., Xiaoyan, C., Olk, D. C., Wenying, C. and Schmidt-Rohr, K. (2017). Advanced solid-state NMR spectroscopy of natural organic matter. Progress in Nuclear Magnetic Resonance Spectroscopy 100 , pp. 17-51.

Xu, J., Zhao, B., Chu, W., Mao, J., Olk, D. C.., Xin, X. and Zhang, J. (2017). Altered humin compositions under organic and inorganic fertilization on an intensively cultivated sandy loam soil. Science of The Total Environment 601-602 , pp. 356 - 364.

Song, G., Novotny, E. H., Mao, J. and Hayes, M. HB. (2017). Characterization of transformations of maize residues into soil organic matter. Science of The Total Environment 579 , pp. 1843–1854.

Xu, J., Zhao, B., Chu, W., Mao, J. and Zhang, J. (2017). Chemical nature of humic substances in two typical Chinese soils (upland vs paddy soil): A comparative advanced solid state NMR study. Science of The Total Environment 576 , pp. 444–452.

Toosi, E. R.., Kravchenko, A. N.., Mao, J., Quigley, M. Y.. and Rivers, M. L.. (2017). Effects of management and pore characteristics on organic matter composition of macroaggregates: evidence from characterization of organic matter and imaging. European Journal of Soil Science 68 (2) , pp. 200--211.

Qu, X., Fu, H., Mao, J., Ran, Y., Zhang, D. and Zhu, D. (2016). Chemical and structural properties of dissolved black carbon released from biochars. Carbon 96 , pp. 759–767.

Cao, X., Lattao, C., Schmidt-Rohr, K., Mao, J. and Pignatello, J. J. (2016). Investigation of sorbate-induced plasticization of Pahokee peat by solid-state NMR spectroscopy. Journal of Soils and Sediments 16 (7) , pp. 1841–1848.

Cao, X., Aiken, G. R., Spencer, R. GM., Butler, K., Mao, J. and Schmidt-Rohr, K. (2016). Novel insights from NMR spectroscopy into seasonal changes in the composition of dissolved organic matter exported to the Bering Sea by the Yukon River. Geochimica et Cosmochimica Acta 181 , pp. 72–88.

Fu, H., Liu, H., Mao, J., Chu, W., Li, Q., Alvarez, P. JJ., Qu, X. and Zhu, D. (2016). Photochemistry of dissolved black carbon released from biochar: reactive oxygen species generation and phototransformation. Environmental science & technology 50 (3) , pp. 1218–1226.

Cao, X., Drosos, M., Leenheer, J. A. and Mao, J. (2016). Secondary Structures in a Freeze-Dried Lignite Humic Acid Fraction Caused by Hydrogen-Bonding of Acidic Protons with Aromatic Rings. Environmental science & technology 50 (4) , pp. 1663–1669.

Zhang, D., Ran, Y., Cao, X., Mao, J., Cui, J. and Schmidt-Rohr, K. (2015). Biosorption of nonylphenol by pure algae, field-collected planktons and their fractions. Environmental Pollution 198 , pp. 61–69.

Zhang, X., Gao, H., Wu, H., Yang, T., Zhang, Z., Mao, J. and Wan, X. (2015). Ca 2+ and CaM are involved in Al 3+ pretreatment-promoted fluoride accumulation in tea plants (Camellia sinesis L.). Plant Physiology and Biochemistry 96 , pp. 288–295.

Zhou, Z., Hua, B., Cao, X., Yang, J., Olk, D. C., Deng, B., Liu, F., Li, R. and Mao, J. (2015). Chemical composition of dissolved organic matter from various sources as characterized by solid-state NMR. Aquatic Sciences 77 (4) , pp. 595–607.

Zhang, Y., Yao, S., Mao, J., Olk, D. C., Cao, X. and Zhang, B. (2015). Chemical composition of organic matter in a deep soil changed with a positive priming effect due to glucose addition as investigated by 13 C NMR spectroscopy. Soil Biology and Biochemistry 85 , pp. 137–144.

Keiluweit, M., Nico, P., Harmon, M. E., Mao, J., Pett-Ridge, J. and Kleber, M. (2015). Long-term litter decomposition controlled by manganese redox cycling. Proceedings of the National Academy of Sciences 112 (38) , pp. E5253–E5260.

Zhou, G., Zhang, J., Mao, J., Zhang, C., Chen, L., Xin, X. and Zhao, B. (2015). Mass loss and chemical structures of wheat and maize straws in response to ultraviolet-B radiation and soil contact. Scientific reports 5.

Li, Y., Chen, N., Harmon, M. E., Li, Y., Cao, X., Chappell, M. A. and Mao, J. (2015). Plant species rather than climate greatly alters the temporal pattern of litter chemical composition during long-term decomposition. Scientific reports 5 , pp. 15783.

He, Z., Zhang, M., Cao, X., Li, Y., Mao, J. and Waldrip, H. M. (2015). Potential traceable markers of organic matter in organic and conventional dairy manure using ultraviolet–visible and solid-state 13C nuclear magnetic resonance spectroscopy. Organic Agriculture 5 (2) , pp. 113–122.

Helms, J. R., Mao, J., Chen, H., Perdue, E. Michael., Green, N. W., Hatcher, P. G., Mopper, K. and Stubbins, A. (2015). Spectroscopic characterization of oceanic dissolved organic matter isolated by reverse osmosis coupled with electrodialysis. Marine Chemistry 177 , pp. 278–287.

Helms, J. R., Mao, J., Chen, H., Perdue, E. Michael., Green, N., Hatcher, P. G., Mopper, K. and Stubbins, A. (2015). Supplementary Material to accompany: Spectroscopic characterization of oceanic dissolved organic matter isolated by reverse osmosis coupled with electrodialysis: Implications for oceanic carbon cycling.

Mao, J., Johnson, R., Lehmann, J., Olk, D., Neves, E., Thompson, M. and Schmidt-Rohr, K. (2014). APPENDIX A. ABUNDANT AND STABLE CHAR RESIDUES IN SOILS: IMPLICATIONS FOR SOIL FERTILITY AND CARBON SEQUESTRATION. Solid state NMR of carbon and catalyst materials with applications for biorenewable chemicals 46 , pp. 155.

Zhou, Z., Chen, N., Cao, X., Chua, T., Mao, J., Mandel, R. D., Bettis, E. Arthur. and Thompson, M. L. (2014). Composition of clay-fraction organic matter in Holocene paleosols revealed by advanced solid-state NMR spectroscopy. Geoderma 223 , pp. 54–61.

Zhang, Y., Huang, W., Ran, Y. and Mao, J. (2014). Compositions and constituents of freshwater dissolved organic matter isolated by reverse osmosis. Marine pollution bulletin 85 (1) , pp. 60–66.

Ma, H., Li, J., Liu, W., Cheng, B., Cao, X., Mao, J. and Zhu, S. (2014). Hydrothermal Preparation and Characterization of Novel Corncob-Derived Solid Acid Catalysts. Journal of agricultural and food chemistry 62 (23) , pp. 5345–5353.

Lattao, C., Cao, X., Mao, J., Schmidt-Rohr, K. and Pignatello, J. J. (2014). Influence of molecular structure and adsorbent properties on sorption of organic compounds to a temperature series of wood chars. Environmental science & technology 48 (9) , pp. 4790–4798.

Gao, H., Zhao, Q., Zhang, X., Wan, X. and Mao, J. (2014). Localization of fluoride and aluminum in subcellular fractions of tea leaves and roots. Journal of agricultural and food chemistry 62 (10) , pp. 2313–2319.

Helms, J. R., Mao, J., Stubbins, A., Schmidt-Rohr, K., Spencer, R. GM., Hernes, P. J. and Mopper, K. (2014). Loss of optical and molecular indicators of terrigenous dissolved organic matter during long-term photobleaching. Aquatic sciences 76 (3) , pp. 353–373.

Zhou, Z., Cao, X., Schmidt-Rohr, K., Olk, D. C., Zhuang, S., Zhou, J., Cao, Z. and Mao, J. (2014). Similarities in chemical composition of soil organic matter across a millennia-old paddy soil chronosequence as revealed by advanced solid-state NMR spectroscopy. Biology and fertility of soils 50 (4) , pp. 571–581.

Cao, X., Lattao, C., Pignatello, J. J., Mao, J. and Schmidt-Rohr, K. (2014). Sorption Selectivity in Natural Organic Matter Probed with Fully Deuterium-Exchanged and Carbonyl-13C-Labeled Benzophenone and 1H–13C NMR Spectroscopy. Environmental science & technology 48 (15) , pp. 8645–8652.

Cao, X., Yang, J. and Mao, J. (2013). Characterization of kerogen using solid-state nuclear magnetic resonance spectroscopy: A review. International Journal of Coal Geology 108 , pp. 83–90.

Cao, X., Chappell, M. A., Schimmelmann, A., Mastalerz, M., Li, Y., Hu, W. and Mao, J. (2013). Chemical structure changes in kerogen from bituminous coal in response to dike intrusions as investigated by advanced solid-state 13 C NMR spectroscopy. International Journal of Coal Geology 108 , pp. 53–64.

Cao, X., Ro, K. S., Libra, J. A., Kammann, C. I., Lima, I., Berge, N., Li, L., Li, Y., Chen, N., Yang, J. and others (2013). Effects of biomass types and carbonization conditions on the chemical characteristics of hydrochars. Journal of agricultural and food chemistry 61 (39) , pp. 9401–9411.

Sun, K., Ran, Y., Yang, Y., Xing, B. and Mao, J. (2013). Interaction mechanism of benzene and phenanthrene in condensed organic matter: importance of adsorption (nanopore-filling). Geoderma 204 , pp. 68–74.

Helms, J. R., Mao, J., Schmidt-Rohr, K., Abdulla, H. and Mopper, K. (2013). Photochemical flocculation of terrestrial dissolved organic matter and iron. Geochimica et Cosmochimica Acta 121 , pp. 398–413.

Chen, N., Lan, Y., Wang, B. and Mao, J. (2013). Reduction of Cr (VI) by organic acids in the presence of Al (III). Journal of hazardous materials 260 , pp. 150–156.

Zhang, Y., Ran, Y. and Mao, J. (2013). Role of extractable and residual organic matter fractions on sorption of phenanthrene in sediments. Chemosphere 90 (6) , pp. 1973–1979.

Li, J., Evanylo, G. K., Xia, K. and Mao, J. (2013). Soil Carbon Characterization 10 to 15 Years After Organic Residual Application: Carbon (1s) K-Edge Near-Edge X-Ray Absorption Fine-Structure Spectroscopy Study. Soil Science 178 (9) , pp. 453–464.

Xie, M., Lv, D., Shi, X., Wan, Y., Chen, W., Mao, J. and Zhu, D. (2013). Sorption of monoaromatic compounds to heated and unheated coals, humic acid, and biochar: Implication for using combustion method to quantify sorption contribution of carbonaceous geosorbents in soil. Applied geochemistry 35 , pp. 289–296.

Mao, J., Johnson, R., Lehmann, J., Olk, D., Neves, E. Goes., Thompson, M. and Schmidt-Rohr, K. (2012). Abundant and stable char residues in soils: implications for soil fertility and carbon sequestration. Environmental science & technology 46 (17) , pp. 9571–9576.

Mao, J., Kong, X., Schmidt-Rohr, K., Pignatello, J. J. and Perdue, E. Michael. (2012). Advanced solid-state NMR characterization of marine dissolved organic matter isolated using the coupled reverse osmosis/electrodialysis method. Environmental science & technology 46 (11) , pp. 5806–5814.

Li, Y., Cao, X., Zhu, D., Chappell, M. A., Miller, L. F. and Mao, J. (2012). Characterization of coals and their laboratory-prepared black carbon using advanced solid-state 13 C nuclear magnetic resonance spectroscopy. Fuel processing technology 96 , pp. 56–64.

Cao, X., Pignatello, J. J., Li, Y., Lattao, C., Chappell, M. A., Chen, N., Miller, L. F. and Mao, J. (2012). Characterization of wood chars produced at different temperatures using advanced solid-state 13C NMR spectroscopic techniques. Energy & Fuels 26 (9) , pp. 5983–5991.

Schneckenburger, T., Lattao, C., Pignatello, J. J., Schaumann, G. E., Thiele-Bruhn, S., Cao, X. and Mao, J. (2012). Preparation and characterization of humic acid cross-linked with organic bridging groups. Organic geochemistry 47 , pp. 132–138.

Regmi, P., Moscoso, J. Luis Garcia., Kumar, S., Cao, X., Mao, J. and Schafran, G. (2012). Removal of copper and cadmium from aqueous solution using switchgrass biochar produced via hydrothermal carbonization process. Journal of environmental management 109 , pp. 61–69.

Lattao, C., Cao, X., Li, Y., Mao, J., Schmidt-Rohr, K., Chappell, M. A., Miller, L. F., dela Cruz, A. Leo. and Pignatello, J. J. (2012). Sorption selectivity in natural organic matter studied with nitroxyl paramagnetic relaxation probes. Environmental science & technology 46 (23) , pp. 12814–12822.

Helms, J. R., Kong, X., Salmon, E., Hatcher, P. G., Schmidt-Rohr, K. and Mao, J. (2012). Structural characterization of gilsonite bitumen by advanced nuclear magnetic resonance spectroscopy and ultrahigh resolution mass spectrometry revealing pyrrolic and aromatic rings substituted with aliphatic chains. Organic geochemistry 44 , pp. 21–36.

Wang, X., Sun, B., Mao, J., Sui, Y. and Cao, X. (2012). Structural convergence of maize and wheat straw during two-year decomposition under different climate conditions. Environmental science & technology 46 (13) , pp. 7159–7165.

Holtman, K. M., Kodama, A., Klamczynski, A. P., Flynn, A., Bozzi, D. V., Torres, L., Franqui-Villanueva, D., Mao, J., Glenn, G. M. and Orts, W. J. (2012). Thermal properties of poly (ethylene terephthalate) recovered from municipal solid waste by steam autoclaving. Journal of Applied Polymer Science 126 (5) , pp. 1698–1708.

Fang, X., Mao, J., Cory, R. M., McKnight, D. M. and Schmidt-Rohr, K. (2011). 15N and 13C ${$14N$}$ NMR investigation of the major nitrogen-containing segment in an aquatic fulvic acid: Evidence for a hydantoin derivative. Magnetic Resonance in Chemistry 49 (12) , pp. 775–780.

Cao, X., Guo, J., Mao, J. and Lan, Y. (2011). Adsorption and mobility of Cr (III)–organic acid complexes in soils. Journal of hazardous materials 192 (3) , pp. 1533–1538.

Mao, J., Chen, N. and Cao, X. (2011). Characterization of humic substances by advanced solid state NMR spectroscopy: demonstration of a systematic approach. Organic Geochemistry 42 (8) , pp. 891–902.

Cao, X., Mastalerz, M., Chappell, M. A., Miller, L. F., Li, Y. and Mao, J. (2011). Chemical structures of coal lithotypes before and after CO 2 adsorption as investigated by advanced solid-state 13 C nuclear magnetic resonance spectroscopy. International Journal of Coal Geology 88 (1) , pp. 67–74.

He, Z. and Mao, J. (2011). Functional groups identified by solid state 13 C NMR spectroscopy. Environmental chemistry of animal manure. Nova, NY , pp. 41–59.

Berge, N. D., Ro, K. S., Mao, J., Flora, J. RV., Chappell, M. A. and Bae, S. (2011). Hydrothermal carbonization of municipal waste streams. Environmental science & technology 45 (13) , pp. 5696–5703.

Berge, N. D., Ro, K. S., Mao, J., Flora, J. RV., Chappell, M. A. and Bae, S. (2011). Hydrothermal Carbonization of Municipal Waste Streams: Supporting Information. Environmental Science & Technology 42 (13) , pp. 5696-5703.

Shi, X., Fu, H., Li, Y., Mao, J., Zheng, S. and Zhu, D. (2011). Impact of coal structural heterogeneity on the nonideal sorption of organic contaminants. Environmental Toxicology and Chemistry 30 (6) , pp. 1310–1319.

Guo, J., Du, Y., Lan, Y. and Mao, J. (2011). Photodegradation mechanism and kinetics of methyl orange catalyzed by Fe (III) and citric acid. Journal of hazardous materials 186 (2) , pp. 2083–2088.

Dai, R., Yu, C., Gou, J., Lan, Y. and Mao, J. (2011). Photoredox pathways of Cr (III)–tartrate complexes and their impacting factors. Journal of hazardous materials 186 (2) , pp. 2110–2116.

Gao, X., Yang, F., Lan, Y., Mao, J. and Duan, X. (2011). Rapid degradation of carbon tetrachloride by commercial micro-scale zinc powder assisted by citric acid. Environmental chemistry letters 9 (3) , pp. 431–438.

Cao, X., Olk, D. C., Chappell, M., Cambardella, C. A., Miller, L. F. and Mao, J. (2011). Solid-state NMR analysis of soil organic matter fractions from integrated physical–chemical extraction. Soil Science Society of America Journal 75 (4) , pp. 1374–1384.

Mao, J., Tremblay, L. and Gagné, J. (2011). Structural changes of humic acids from sinking organic matter and surface sediments investigated by advanced solid-state NMR: Insights into sources, preservation and molecularly uncharacterized components. Geochimica et Cosmochimica Acta 75 (24) , pp. 7864–7880.

Tian, X., Gao, X., Yang, F., Lan, Y., Mao, J. and Zhou, L. (2010). Catalytic role of soils in the transformation of Cr (VI) to Cr (III) in the presence of organic acids containing $α$-OH groups. Geoderma 159 (3) , pp. 270–275.

Mao, J., Fang, X., Lan, Y., Schimmelmann, A., Mastalerz, M., Xu, L. and Schmidt-Rohr, K. (2010). Chemical and nanometer-scale structure of kerogen and its change during thermal maturation investigated by advanced solid-state 13 C NMR spectroscopy. Geochimica et Cosmochimica Acta 74 (7) , pp. 2110–2127.

Holtman, K. M., Chen, N., Chappell, M. A., Kadla, J. F., Xu, L. and Mao, J. (2010). Chemical structure and heterogeneity differences of two lignins from loblolly pine as investigated by advanced solid-state NMR spectroscopy. Journal of agricultural and food chemistry 58 (18) , pp. 9882–9892.

Cao, X., Ro, K. S., Chappell, M., Li, Y. and Mao, J. (2010). Chemical structures of swine-manure chars produced under different carbonization conditions investigated by advanced solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Energy & Fuels 25 (1) , pp. 388–397.

Mao, J. and Helms, J. R. (2010). Elucidating the structure of gilsonite bitumen by advanced Nuclear Magnetic Resonance Spectroscopy. Geoderma 140 , pp. 17–29.

Mao, J., Schimmelmann, A., Mastalerz, M., Hatcher, P. G. and Li, Y. (2010). Structural features of a bituminous coal and their changes during low-temperature oxidation and loss of volatiles investigated by advanced solid-state NMR spectroscopy. Energy & Fuels 24 , pp. 2536-2544.

Mao, J., Schimmelmann, A., Mastalerz, M. and Schmidt-Rohr, K. (2010). Systematic characterization of kerogen using advanced solid-state nuclear magnetic resonance. The Society for Organic Petrology (TSOP).

Sun, H., Shi, X., Mao, J. and Zhu, D. (2010). Tetracycline sorption to coal and soil humic acids: an examination of humic structural heterogeneity. Environmental Toxicology and Chemistry 29 (9) , pp. 1934–1942.

Dai, R., Liu, J., Yu, C., Sun, R., Lan, Y. and Mao, J. (2009). A comparative study of oxidation of Cr (III) in aqueous ions, complex ions and insoluble compounds by manganese-bearing mineral (birnessite). Chemosphere 76 (4) , pp. 536–541.

He, Z., Mao, J., Honeycutt, C., Ohno, T., Hunt, J. F. and Cade-������n, B. J. (2009). Characterization of plant-derived water extractable organic matter by multiple spectroscopic techniques. Biology and Fertility of Soils 45 (6) , pp. 609–616.

Liu, Z., Mao, J., Peterson, M. L., Lee, C., Wakeham, S. G. and Hatcher, P. G. (2009). Characterization of sinking particles from the northwest Mediterranean Sea using advanced solid-state NMR. Geochimica et Cosmochimica Acta 73 (4) , pp. 1014–1026.

Sun, J., Mao, J., Gong, H. and Lan, Y. (2009). Fe (III) photocatalytic reduction of Cr (VI) by low-molecular-weight organic acids with $α$-OH. Journal of hazardous materials 168 (2) , pp. 1569–1574.

Fang, X., Mao, J., Levin, E. and Schmidt-Rohr, K. (2009). Nonaromatic core- shell structure of nanodiamond from solid-state NMR spectroscopy. Journal of the American Chemical Society 131 (4) , pp. 1426–1435.

Fang, X. W., Mao, J., Levin, E. M. and Schmidt-Rohr, K. (2009). Nonaromatic coreshell structure of nanodiamond from solid-state NMR. Journal of the American Chemical Society 131 , pp. 1426-1435.

Fang, X., Mao, J., Levin, E. and Schmidt-Rohr, K. (2008). . Nonaromatic core-shell structure of nanodiamond from solid–state NMR. NMR studies of complex carbon-containing materials: Maillard reaction products, soil, nanodiamond, and carbon modified TiO? , pp. 158.

He, Z., Ohno, T., Olk, D. C., Wu, F., Honeycutt, C. and Mao, J. (2008). Capillary Electrophoresis and Fluorescence Excitation-Emission Matrix Characterization of Soil Mobile and Calcium Humates. From Molecular Understanding to Innovative Applications of Humic Substances , pp. 91.

Schmidt-Rohr, K., Mao, J., Fang, X. and Thompson, M. (2008). Characterization of Black Carbon by Advanced NMR.. Session.

Mao, J., Olk, D. C., Fang, X., He, Z. and Schmidt-Rohr, K. (2008). Influence of animal manure application on the chemical structures of soil organic matter as investigated by advanced solid-state NMR and FT-IR spectroscopy. Geoderma 146 , pp. 353-362.

Mao, J., Olk, D. C., Fang, X., He, Z. and Schmidt-Rohr, K. (2008). Influence of animal manure application on the chemical structures of soil organic matter as investigated by advanced solid-state NMR and FT-IR spectroscopy. Geoderma 146 (1) , pp. 353–362.

Lan, Y., Li, C., Mao, J. and Sun, J. (2008). Influence of clay minerals on the reduction of Cr 6+ by citric acid. Chemosphere 71 (4) , pp. 781–787.

Zhou, H., He, Y., Lan, Y., Mao, J. and Chen, S. (2008). Influence of complex reagents on removal of chromium (VI) by zero-valent iron. Chemosphere 72 (6) , pp. 870–874.

Palazzo, A. J., Clapp, C. Edward., Senesi, N., Hayes, M. HB., Cary, T. J., Mao, J. and Bashore, T. L. (2008). Isolation and characterization of humic acids in Idaho slickspot soils. Soil science 173 (6) , pp. 375–386.

Sun, H., Zhu, D. and Mao, J. (2008). Sorption of polar and nonpolar aromatic compounds to two humic acids with varied structural heterogeneity. Environmental Toxicology and Chemistry 27 (12) , pp. 2449–2456.

He, Z., Mao, J., Honeycutt, W., Ohno, T., Hunt, J. F. and Cade-������n, B. J. (2008). Spectral Characterization of Plant-Derived Dissolved Organic Matter. From Molecular Understanding to Innovative Applications of Humic Substances , pp. 87.

Mao, J., Cory, R. M., McKnight, D. M. and Schmidt-Rohr, K. (2007). Characterization of a nitrogen-rich fulvic acid and its precursor algae by solid-state NMR. Organic Geochemistry 38 , pp. 1277-1292.

Mao, J., Cory, R. M., McKnight, D. M. and Schmidt-Rohr, K. (2007). Characterization of a nitrogen-rich fulvic acid and its precursor algae from solid state NMR. Organic Geochemistry 38 (8) , pp. 1277–1292.

Mao, J., Ajakaiye, A., Lan, Y., Olk, D. C., Ceballos, M., Zhang, T., Fan, M. Z. and Forsberg, C. W. (2007). Chemical structures of manure from conventional and phytase transgenic pigs investigated by advanced solid-state NMR spectroscopy. Journal of agricultural and food chemistry 56 (6) , pp. 2131–2138.

Levin, E., Bud¡¯ko, SL, Mao, J., Huang, Y. and Schmidt-Rohr, K. (2007). Effect of magnetic particles on NMR spectra of Murchison meteorite organic matter and a polymer-based model system. Solid state nuclear magnetic resonance 31 (2) , pp. 63–71.

Mao, J., Tremblay, L., Gagné, J., Kohl, S., Rice, J. and Schmidt-Rohr, K. (2007). Humic acids from particulate organic matter in the Saguenay Fjord and the St. Lawrence Estuary investigated by advanced solid-state NMR. Geochimica et Cosmochimica Acta 71 (22) , pp. 5483–5499.

Mao, J., Tremblay, L., Gagne, J. P., Kohl, S., Rice, J. and Schmidt-Rohr, K. (2007). Humic acids from particulate organic matter in the Saguenay Fjord and the St. Lawrence Estuary investigated by advanced solid-state NMR. Geochimica et Cosmochimica Acta 71 , pp. 5483-5499.

Mao, J., Fang, X., Schmidt-Rohr, K., Carmo, A. M., Hundal, L. S. and Thompson, M. L. (2007). Molecular-scale heterogeneity of humic acid in particle-size fractions of two Iowa soils. Geoderma 140 (1) , pp. 17–29.

Mao, J., Fang, X., Schmidt-Rohr, K., Carmo, A. M., Hundal, L. S. and Thompson, M. L. (2007). Molecular-scale heterogeneity of humic acid in particle-size fractions of two Iowa soils. Geoderma 140 , pp. 17-29.

Masutti, C. Miranda., Mermut, A., Candela, L., Álvarez-Benedi, J., de Melo, M. Condesso., Rao, P., Mao, J., Fang, X., Schmidt-Rohr, K., Carmo, A. and others (2007). www. elsevier. com/locate/geoderma. Geoderma 140 , pp. 215.

Mao, J. and Schmidt-Rohr, K. (2006). Absence of mobile carbohydrate domains in dry humic substances proven by NMR, and implications for organic-contaminant sorption. Environmental Science and Technology 40 (6) , pp. 1751-1756.

Olk, D., Cassman, K. G., Schmidt-Rohr, K., Anders, M., Mao, J. and Deenik, J. (2006). Chemical stabilization of soil organic nitrogen by phenolic lignin residues in anaerobic agroecosystems. Soil Biology and Biochemistry 38 (11) , pp. 3303–3312.

Mao, J., Holtman, K. M., Scott, J. T., Kadla, J. F. and Schmidt-Rohr, K. (2006). Differences between lignin in unprocessed wood, milled wood, mutant wood, and extracted lignin detected by 13C solid-state NMR. Journal of agricultural and food chemistry 54 (26) , pp. 9677–9686.

Mao, J., Holtman, K. M., Scott, J. T., Kadla, J. F. and Schmidt-Rohr, K. (2006). Differences between lignin in unprocessed wood, milled wood, mutant wood, and extracted lignin detected by ^13C solid-state NMR. Journal of Agricultural and Food Chemistry 54 , pp. 9677-9686.

Olk, D., Cassman, K., Anders, M., Schmidt-Rohr, K., Mao, J. and others (2005). Does anaerobic decomposition of crop residues impair soil nitrogen cycling and yield trends in lowland rice?. Copyright International Rice Research Institute 2005 , pp. 374.

Mao, J. and Schmidt-Rohr, K. (2005). Methylene spectral editing in solid-state 13 C NMR by three-spin coherence selection. Journal of Magnetic Resonance 176 (1) , pp. 1–6.

Mao, J. and Schmidt-Rohr, K. (2005). Methylene spectral editing in solid-state NMR by three-spin coherence selection. Journal of Magnetic Resonance 176 , pp. 1-6.

Ding, G., Mao, J., Herbert, S., Xing, B. and Amarasiriwardena, D. (2005). Spectroscopic characterization of fulvic acid under different cover crop systems. Communications in soil science and plant analysis 36 (15-16) , pp. 2101–2111.

Mao, J. and Schmidt-Rohr, K. (2004). Accurate quantification of aromaticity and nonprotonated aromatic carbon fraction in natural organic matter by 13C solid-state nuclear magnetic resonance. Environmental science & technology 38 (9) , pp. 2680–2684.

Mao, J. and Schmidt-Rohr, K. (2004). Accurate quantification of aromaticity and unprotonated aromatic carbon fraction in natural organic matter by ^13C solid-state NMR. Environmental Science and Technology 38 , pp. 2680-2684.

FERREIRA, J., SIMÕES, M., MILORI, D., MARTIN NETO, L., HAYES, M., Mao, J. and SCHMIDT-ROHR, K. (2004). Caracterizacao Espectroscópica da Matéria Organica do Solo.. Embrapa Instrumentacao Agropecuária. Circular Técnica.

Mao, J. and Schmidt-Rohr, K. (2004). Separation of acetal or ketal O-C-O ^13C NMR signals from aromatic-carbon bands by a chemical-shift-anisotropy filter. Solid State NMR 26 , pp. 36-45.

Mao, J., Hundal, L., Schmidt-Rohr, K. and Thompson, M. (2003). Nuclear magnetic resonance and diffuse-reflectance infrared Fourier transform spectroscopy of biosolids-derived biocolloidal organic matter. Environmental science & technology 37 (9) , pp. 1751–1757.

Mao, J. and Schmidt-Rohr, K. (2003). Recoupled long-range C–H dipolar dephasing in solid-state NMR, and its use for spectral selection of fused aromatic rings. Journal of Magnetic Resonance 162 (1) , pp. 217–227.

Liu, S., Mao, J. and Schmidt-Rohr, K. (2002). A robust technique for two-dimensional separation of undistorted chemical-shift anisotropy powder patterns in magic-angle-spinning NMR. Journal of Magnetic Resonance 155 (1) , pp. 15–28.

Mao, J., Hundal, L., Thompson, M. and Schmidt-Rohr, K. (2002). Correlation of poly (methylene)-rich amorphous aliphatic domains in humic substances with sorption of a nonpolar organic contaminant, phenanthrene. Environmental science & technology 36 (5) , pp. 929–936.

Mao, J., Ding, G. and Xing, B. (2002). Domain mobility of humic acids investigated with one-and two-dimensional nuclear magnetic resonance: support for dual-mode sorption model. Communications in soil science and plant analysis 33 (9-10) , pp. 1679–1688.

Schmidt-Rohr, K. and Mao, J. (2002). Efficient CH-group selection and identification in 13C solid-state NMR by dipolar DEPT and 1H chemical-shift filtering. Journal of the American Chemical Society 124 (46) , pp. 13938–13948.

Schmidt-Rohr, K. and Mao, J. (2002). Selective observation of nitrogen-bonded carbons in solid-state NMR by saturation-pulse induced dipolar exchange with recoupling. Chemical physics letters 359 (5) , pp. 403–411.

Clapp, C., Hayes, M. and Mao, J. (2002). Studies of Humic Fractions from a Mollisol Soil. World , pp. 196.

Mao, J., Hu, W., Ding, G., Schmidt-Rohr, K., Davies, G., Ghabbour, E. and Xing, B. (2002). Suitability of different 13C solid-state NMR techniques in the characterization of humic acids. International Journal of Environmental & Analytical Chemistry 82 (4) , pp. 183–196.

Ding, G., Mao, J. and Xing, B. (2001). Characteristics of amino acids in soil humic substances. Communications in soil science and plant analysis 32 (13-14) , pp. 1991–2005.

Mao, J., Xing, B. and Schmidt-Rohr, K. (2001). New structural information on a humic acid from two-dimensional 1H-13C correlation solid-state nuclear magnetic resonance. Environmental science & technology 35 (10) , pp. 1928–1934.

Ding, G., Mao, J., Herbert, S., Amarasiriwardena, D. and Xing, B. (2001). Spectroscopic evaluation of humin changes in response to soil managements. SPECIAL PUBLICATION-ROYAL SOCIETY OF CHEMISTRY 273 , pp. 271–280.

Mao, J., Hu, W., Schmidt-Rohr, K., Davies, G., Ghabbour, E. and Xing, B. (2000). DIVISION S-2¡ªSOIL CHEMISTRY. Soil Sci. Soc. Am. J 64 , pp. 873–884.

Hu, W., Mao, J., Xing, B. and Schmidt-Rohr, K. (2000). Poly (methylene) crystallites in humic substances detected by nuclear magnetic resonance. Environmental science & technology 34 (3) , pp. 530–534.

Mao, J., Hu, W., Schmidt-Rohr, K., Davies, G., Ghabbour, E. and Xing, B. (2000). Quantitative characterization of humic substances by solid-state carbon-13 nuclear magnetic resonance. Soil Science Society of America Journal 64 (3) , pp. 873–884.

Mao, J., Schmidt-Rohr, K. and Xing, B. (2000). Structural investigation of Humic Substances using 2D solid-state nuclear magnetic resonance. SPECIAL PUBLICATION-ROYAL SOCIETY OF CHEMISTRY 259 , pp. 83–90.

Xing, B., Mao, J., Wei-Guo, H., Schmidt-Rohr, K., Davies, G. and Ghabbour, E. A. (1999). Evaluation of Different Solid-state 1 3C NMR Techniques for Characterizing Humic Acids. SPECIAL PUBLICATION-ROYAL SOCIETY OF CHEMISTRY 247 (1) , pp. 49–62.

Mao, J. and Xing, B. (1999). Fractionation and distribution of selenium in soils. Communications in Soil Science & Plant Analysis 30 (17-18) , pp. 2437–2447.

Wei-Guo, H., Mao, J., Schmidt-Rohr, K. and Xing, B. (1999). NMR evidence for crystalline domains in humic substances. SPECIAL PUBLICATION-ROYAL SOCIETY OF CHEMISTRY 247 (1) , pp. 63–68.

Mao, J. and Xing, B. (1998). Effect of soil amendments on fractionation of Selenium-enriched soil. Communications in Soil Science & Plant Analysis 29 (19-20) , pp. 2917–2925.

Mao, J., Hu, W., Schmidt-Rohr, K., Davies, G., Ghabbour, E. and Xing, B. (1998). Structure and Elemental Composition of Humic Acids: Comparison of Solid-State 1 3C NMR Calculations and Chemical Analyses. SPECIAL PUBLICATION-ROYAL SOCIETY OF CHEMISTRY 228 , pp. 79–90.

Book Chapters

Mao, J., Cao, X. and Chen, N. (2013). Characterization of Biochars Using Advanced Solid-State 13C Nuclear Magnetic Resonance Spectroscopy Advanced Biofuels and Bioproducts (pp. 47–55) Springer.

Mao, J., Olk, D. C., Chen, N., Dinnes, D. L. and Chappell, M. (2013). Chemical properties of humic and fulvic acid products and their ores of origin Functions of Natural Organic Matter in Changing Environment (pp. 1067–1070) Springer.

Conference Proceeding

Aiken, G., Cao, X., Mao, J., Stubbins, A., Schmidt-Rohr, K. and Spencer, R. (2015). Seasonal variability in the composition of dissolved organic matter in the Yukon River, Alaska AGU Fall Meeting Abstracts.

Zhou, Z., Hua, B., Cao, X., Yang, J., Schmidt-Rohrc, K., Olkd, D., Deng, B., Li, R. and Mao, J. (2014). Chemical structures of dissolved organic matter from various sources as characterized by solid-state NMR: Insights into molecular signatures in relation to point and nonpoint sources ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Pignatello, J. J., Cao, X., Lattao, C., Mao, J. and Schmidt-Rohr, K. (2014). Sorption selectivity in natural organic matter studied with NMR spin and relaxation probes ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

He, Z., Zhang, M., Mao, J. and Waldrip, H. M. (2013). Exploration of distinct spectral features between conventional and organic dairy manure ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mopper, K., Helms, JR, Mao, J., Abdulla, H. and Schmidt-Rohr, K. (2013). Photochemical Flocculation of Terrestrial Dissolved Organic Matter (tDOM) and Iron: Mechanisms and Geochemical Implications AGU Fall Meeting Abstracts.

Mao, J., Cao, X. and Birdwell, J. (2013). Systematic advanced NMR techniques for characterizing oil shale, its isolates, and residues after retorting ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mao, J., Chen, N., Harmon, M., Li, Y., Cao, X. and Chappell, M. (2012). Litter decomposition over broad spatial and long time scales investigated by advanced solid-state NMR: insight into effects of climate, litter quality, and time AGU Fall Meeting Abstracts (pp. 0259).

Mao, J., Cao, X., Chappell, M. A., Schimmelmann, A., Mastalerz, M. and Li, Y. (2011). Chemical structural changes in kerogen from bituminous coal in response to dike intrusions as investigated by advanced C-13 solid-state NMR ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mao, J. and Schmidt-Rohr, K. (2010). Advanced solid-state NMR spectroscopy for investigating charcoal ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Chappell, M. A., Mao, J., Ford, L. S. and Price, C. L. (2010). Biochars and soil humic surfactancy ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mao, J., Pignatello, J. J., Lehmann, J. and Chappell, M. (2010). Characterization of charcoal using advanced solid-state NMR ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Perdue, E. Michael., Green, N. W., Chen, H., Stubbins, A., Mopper, K., Mao, J., Helms, J. R. and Hatcher, P. G. (2010). Chemical and spectroscopic characterization of marine dissolved organic matter isolated using the coupled reverse osmosis-electrodialysis (RO/ED) method ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

He, Z., Mao, J., Tazisong, I. and Senwo, Z. (2010). FT-IR and C-13 NMR analysis of soil humic fractions from a long term cropping systems study Humic Science and Technology Conference (pp. 58).

Mao, J., Kong, X., Schmidt-Rohr, K. and Perdue, E. Michael. (2010). Insight into chemical structures and potential sources of marine and coastal dissolved organic matter by advanced solid-state NMR ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mao, J., Olk, D. and Li, Y. (2009). Advanced 13C NMR Analysis of the Light Fraction, Particulate Organic Matter, and Humic Acid Fractions From a Corn-Soybean Soil ASA-CSSA-SSSA Annual Meeting Abstracts.

Mao, J. (2009). Characterization of nitrogen in geological organic matters samples using advanced solid-state NMR spectroscopy 2009 Portland GSA Annual Meeting.

He, Z., Honeycutt, C., Ohno, T. and Mao, J. (2009). Mobile humic acids and recalcitrant calcium humate in eight US soils Meeting Abstract (pp. 151).

Mao, J. (2009). STRUCTURAL FEATURES OF A BITUMINOUS COAL AND THEIR CHANGES AFTER LOW-TEMPERATURE OXIDATION AND LOSS OF VOLATILES INVESTIGATED BY ADVANCED SOLID-STATE NMR SPECTROSCOPY 2009 Portland GSA Annual Meeting.

Chappell, M., George, A. J., Mao, J., Bourne, G. and Price, C. L. (2009). Surfactive quality of humic substances for stabilizing carbon nanotube disperisons ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY.

Mao, J., AJAKAIYE, A., Yeqing, L., Olk, D., CEBALLOS, M., Zhang, T., MING, Z. and CECIL, W. FORSBERG. (2008). Characterization of Manure from Conventional and Phytase Transgenic Pigs by Advanced Solid-State NMR Spectroscopy. ASA-CSSA-SSSA Annual Meeting Abstracts.

Mao, J., Fang, X., Schimmelmann, A., Mastalerz, M., Xu, L. and Schmidt-Rohr, K. (2008). Correlation between chemical structures of kerogen and thermal maturity investigated by advanced solid-state NMR spectroscopy 2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM.

Mao, J., Olk, D. and Gleason, J. (2007). Advanced Solid-State 13C NMR Analysis of Organic Matter in a Nebraska Corn Soil Amended with Cattle Manure. ASA-CSSA-SSSA Annual Meeting Abstracts.

Clapp, C., Palazzo, A., Cary, T., Senesi, N., Brunetti, G., Hayes, M., Clapp, J., Mao, J. and Schmidt-Rohr, K. (2005). Isolation and Characterization of Humic Acids from" slickspot" Soils Meeting Abstract (pp. 54).

Vial, R., Clapp, C., Clapp, J., Cary, T., Palazzo, A., Senesi, N., Brunetti, G., Hayes, M., Schmitt-Rohr, K. and Mao, J. (2004). Characterization of Humic Acids from Idaho’slickspot’Soils ASA-CSSA-SSSA Annual Meeting Abstracts.

Cary, T., Palazzo, A., Bashore, T., Senesi, N., Brunetti, G., Clapp, C., Clapp, J., Hayes, M., Schmidt-Rohr, K. and Mao, J. (2004). Isolation and Characterization of Humic Substances from Soils Collected at Juniper Butte Range, Idaho Proceedings of the Brazilian Socity of Humic Substances (pp. 175–177).

Schmidt-Rohr, K., Mao, J. and Olk, D. C. (2004). Nitrogen-bonded aromatics in soil organic matter and their implications for a yield decline in intensive rice cropping (pp. 6351-6354) Proceedings of National Academy of Sciences.

Hayes, M., Clapp, C., Ferreira, J., Mao, J., Song, G. and Byrne, C. (2004). Peptides and Saccharides in Soil Humic Substances ASA-CSSA-SSSA Annual Meeting Abstracts.

Schmidt-Rohr, K., Mao, J. and Olk, D. (2003). Characterization of soil organic matter in tropical rice soils by advanced solid-state NMR American Chemical Society National Meeting.

Hayes, M., Clapp, C., Pedrosa, B., Ferreira, J., Song, G., Mao, J., Schmidt-Rohr, K., Millori, D. and Jongales, P. (2003). Chemistry of Humic Substances in Irish Soils Agronomy Abstracts.

Mao, J., Olk, D. and Schmidt-rohr, K. (2003). Detection of Aromatic-Bonded N and Associated Lignin Residues in a Humic Fraction by Advanced Solid-State Nmr ASA-CSSA-SSSA Proceedings.

Xing, B., Hu, W., Mao, J. and Schmidt-Rohr, K. (1999). Discovery of crystalline and amorphous aliphatic components in humic substances using solid-state NMR. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY (pp. U649–U649).

Ghabbour, E., Davies, G., Lam, Y., Mao, J. and Xing, B. (1999). Isolation of humic acids from the water hyacinth, Eichhornia crassipes. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY (pp. U584–U584).

Mao, J., Hu, W., Schmidt-Rohr, K. and Xing, B. (1999). Solid-state C-13 NMR quantification of humic acid composition by DP/MAS corrected by CP/T-1-TOSS. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY (pp. U649–U649).

Presentations

( 2017). Microbial controls of soil organic matter recycling: Emergent evidence. May 10th, 2017, S&T University of Henan, Luoyang. (invited) Other .

Mao, J. ( 2017). New forms of dissolved organic nitrogen identified by multibond two-dimensional nuclear magnetic resonance spectroscopy coupled with isotopic labeling, March 12th, 2017, Nanjing Agricultural University, Nanjing, China (invited) Other .

• 2017: Research Findings used as a case study in the most classical introductory soil science textbook: The Nature and Property of Soils ,
• 2016: “Excellence in Reviewing” award for 2016, Water, Air & Soil Pollution (WATE Top 25 Reviewers), Water, Air & Soil Pollution
• 2012: Distinguished Research Award, College of Sciences, ������
• 2000: Paul H. D'Amour Fellowship for Academic Excellence, Big Y Company, MA
• 1999: Best Paper by a Young Scientist, Division of Geochemistry, American Chemical Society