Refereed Publications       Cheng, Chin-Min, Yu Sik Hwang, John J. Lenhart and Harold W. Walker, 2008, "Mechanisms for Organic Acid Induced Leaching of Fixated FGD Material." Fuel, Vol. 87, pp. 3137-3146. Hwang, Yu Sik and John J. Lenhart, 2008, "The Dependence of Site-Occupancy Standard State Triple Layer Model Parameters on Inner-Layer Capacitance." Journal of Colloid and Interface Science, Vol. 319, pp. 206-213. Hwang, Yu Sik , Jin Liu, John J. Lenhart and Christopher M. Hadad, 2007, “Surface Complexes of Phthalic Acid at the Hematite/Water Interface.” Journal of Colloid and Interface Science, Vol. 307, pp. 124-134. Chen, Dong, Linda K. Weavers, Harold W. Walker and John J. Lenhart, 2006, "Ultrasonic Control of Ceramic Membrane Fouling Caused by Dissolved Organic Matter and Silica Particles: Effect of Solution Chemistry." Journal of Membrane Science, Vol. 276, pp. 135-144. Lenhart, John J. and James E. Saiers, 2004, “Adsorption of Natural Organic Matter to Air-Water Interfaces During Transport through Unsaturated Porous Media.” Environmental Science and Technology, Vol., 38, pp. 120-126. [download] Lenhart, John J. and James E. Saiers, 2003, “Colloid Mobilization in Water-Saturated Porous Media under Transient Chemical Conditions.” Environmental Science and Technology, Vol. 37, pp. 2780-2787. [download] Saiers, James E. and John J. Lenhart, 2003, “Ionic-Strength Effects on Colloid Transport and Interfacial Reactions in Partially Saturated Porous Media.” Water Resources Research, Vol. 39, No. 9, 1256, doi: 10.1029/2002WR001887. [download] Saiers, James E. and John J. Lenhart, 2003, “Colloid Mobilization and Transport within Unsaturated Porous Media Under Transient-Flow Conditions.” Water Resources Research, Vol. 39, No. 1, 1019, doi: 10.1029/2002WR001379. [download] Lenhart, John J. and James E. Saiers, 2002, “Transport of Silica Colloids Through Unsaturated Porous Media: Experimental Results and Model Comparisons.” Environmental Science and Technology, Vol. 36, pp. 769-777. [download] Lenhart, John J., John R. Bargar and James A. Davis, 2001, “Spectroscopic Evidence for Ternary Surface Complexes in the Lead(II)-Malonic Acid-Hematite System.” Journal of Colloid and Interface Science, Vol. 234, pp. 449-452. [download] Lenhart, John J., Stephen E. Cabaniss, Patrick MacCarthy and Bruce D. Honeyman, 2000, “Uranium(VI) Complexation with Citric, Humic and Fulvic Acids.” Radiochimica Acta, Vol. 88, pp. 345-353. [download] Bargar, John R., Rebecca L. Reitmeyer, John J. Lenhart and James A. Davis, 2000, “Characterization of U(VI)-Carbonato Ternary Complexes of Hematite. I. EXAFS and Electrophoretic Mobility Measurements.” Geochimica et Cosmochimica Acta, Vol. 64, No 16, pp. 2737-2749.[download] Murphy, Richard. J., John. J. Lenhart and Bruce. D. Honeyman, 1999, “The Binding of Thorium and Uranium to Hematite in the Presence of Natural Organic Matter.” Colloids and Surfaces: A. Physicochemical and Engineering Aspects, Vol. 157, pp. 47-62. [download] Lenhart, John J. and Bruce D. Honeyman, 1999 “Uranium(VI) Adsorption to Hematite in the Presence of Humic Acid.” Geochimica et Cosmochimica Acta, Vol. 63, No. 19/20, pp. 2891-2901.[download] Santschi, Peter H., John J. Lenhart and Bruce D. Honeyman. 1997. “Heterogeneous Processes Affecting Trace Element Distribution in Estuaries: The Role of Natural Organic Matter.” Marine Chemistry, Vol. 58, pp. 99-125. [download] Lenhart, John J., Linda A. Figueroa, Bruce D. Honeyman and David Kaneko. 1997. “Modeling the Adsorption of U(VI) onto Animal Chitin Using Coupled Mass Transfer and Surface Complexation Models.” Colloids and Surfaces: A. Physicochemical and Engineering Aspects, Vol. 120, pp. 243-254. [download]          Papers Presented       Fox, Patrick J., Jangguen Lee and John J. Lenhart, 2008, “Coupled Consolidation and Contaminant Transport in Compressible Porous Media”, Proceedings of the 2008 International Association for Computer Methods and Advances in Geomechanics (IACMAG), Goa, India. Murphy, Richard J., John J. Lenhart and Bruce D. Honeyman, 1997, “The Binding of Thorium and Uranium to Hematite in the Presence of Natural Organic Matter.” Presented at the 1997 Conference on Interfaces Against Pollution, Wageningen, The Netherlands. Moutoux, D.E., L. Alvarado-Benson, J. Lenhart, M.A. Swanson, T.H. Wiedemeier, J.T. Wilson, and J.E. Hansen. 1996, “Estimating the Changing Rate of Anaerobic Reductive Dehalogenation of Chlorinated Aliphatic Hydrocarbons in the Presence of Petroleum Hydrocarbons.” Presented at the 1996 National Ground Water Association, Petroleum Hydrocarbons and Organic Chemicals in Ground Water Conference. Houston, Texas. Staman, Orel and John Lenhart, 1994, "Risk Assessment of Inorganic Contamination of Groundwater from Copper Dump-Leaching Operations." Presented at the 1994 SME Annual Meeting. Albuquerque, New Mexico. Lenhart, John J., Linda A. Figueroa, and Bruce D. Honeyman, 1994, "The Design and Testing of CSTR and Batch Treatment Systems for U(VI) in Wastewaters Which Couple Surface Chemistry, Reaction Kinetics, and Mass Transport." Proceedings of the ASCE Environmental Eng. Conference. Boulder, Colorado.         Abstracts and Posters Presented       Hwang, Yu Sik and John J. Lenhart, 2008, “Surface Complexation Modeling of Dicarboxylic Acids at the Hematite/Water Interface”, 235th ACS National Meeting, New Orleans, LA. Lenhart, John J. and Krishnakumar Raman, 2007, “Electrolytic Recovery of Crystalline Brucite from Membrane Residuals”, 233rd ACS National Meeting, Chicago, IL. Hwang, Yu Sik, Lee, Jangguen, John J. Lenhart, Patrick J. Fox and Michael C. Scullion, 2007, “Evaluating PCB Transport from Contaminated Sediments during In Situ Capping”, 233rd ACS National Meeting, Chicago, IL. Raman, Krishnakumar and John J. Lenhart, 2006, “Treatment and Disposal of Membrane Concentrate”, 2006 Ohio Section AWWA SE District Summer Meeting, Columbus, OH. Lenhart, John J. and Yu Sik Hwang, 2006, “Probing the structure of organic acids adsorbed to environmental surfaces using fourier-transform infrared spectroscopy” To be present at the 231th ACS National Meeting. Atlanta Lenhart, John J. and Yu Sik Hwang, 2005, “Probing the surface activity of natural organic matter using surrogate dicarboxylic acids.” Presented at the EMSI/NOM Workshop , Columbus, OH. Hwang, Yu Sik and John J. Lenhart, 2005, “Surface complexation of o-phthalic acid at the hematite/water interface.” Presented at the EMSI/NOM Workshop , Columbus, OH. Liu, Jin, Yu Sik Hwang, John J. Lenhart and Christopher M. Hadad, 2005, “Computational Studies of phthalic acids complexed to iron in solution and on a mineral surface.” Presented at the EMSI/NOM Workshop , Columbus, OH. Hwang, Yu Sik and John J. Lenhart, 2005, "An ATR-FTIR study of dicarboxylic acids at the hematite/water interface". Presented at the 79th ACS Colloid and Surface Science Symposium. Clarkson University, Potsdam, NY. Hwang, Yu Sik , Jin Liu, John J. Lenhart and Christopher M. Hadad, 2005, "Characterizing the structure of dicarboxylic acids at the hematite/water interface." Presented at the 230th ACS National Meeting. Washington, DC. Saiers, James. E., John J. Lenhart and Bin Gao, 2004, “Colloid Mobilization, Transport, and Deposition in Unsaturated Porous Media.” Presented at the 227th American Chemical Society National Convention, Anaheim, CA. Lenhart, John J., 2004, “Applying Surface Complexation Modeling Concepts to Natural Systems: Accounting for NOM.” Presented at the 3rd Annual Environmental Molecular Science, Columbus, OH. Hwang, Yu Sik and John J. Lenhart, 2004, “An ATR-FTIR Study of Carboxylic Acid sorption on Hematite.” Presented at the 3rd Annual Environmental Molecular Science Workshop, Columbus, OH. Lenhart, John J., 2003, “Characterizing Natural Organic Matter Adsorption and Metal-Binding Interactions.” Presented at the 2nd Annual Environmental Molecular Science Workshop, Columbus, OH. Lenhart, John J. and James E. Saiers, 2002, “Coupling Release Kinetics with Solute Transport to Simulate Colloid Entrainment.” Presented at the 76th Colloid and Surface Science Symposium, Ann Arbor, MI. Gower, Drew, James E. Saiers, John J. Lenhart and George M. Hornberger, 2002 "Air Bubble Enhanced Colloid Mobilization in an Unsaturated Porous Medium." Presented at the International Workshop on Colloids and Colloid-Facilitated Transport of Contaminants in Soils and Sediments, Tjele, Denmark. Hornberger, George. M., James E. Saiers, John J. Lenhart, Janna M. Levin and Janet S. Herman, 2001, “Mobilization and Transport of Colloids in the Vadose Zone.” Presented at the AGU Fall 2001 Meeting, San Francisco, CA. Lenhart, John J., Richard J. Murphy, Satawat Saenton and Bruce D. Honeyman, 1999, “The Effect of Citric Acid on the Sorption of Thorium and Uranium on Hematite.” Presented at the 217th American Chemical Society National Convention, Anaheim, CA. Bargar, John R., Rebecca L. Reitmeyer, James A. Davis and John J. Lenhart, 1999, “EXAFS and FTIR characterization of U(VI)-carbonato ternary complexes on iron oxides.” Presented at the 217th American Chemical Society National Convention, Anaheim, CA. Honeyman, Bruce D., Cetin Kantar, John J. Lenhart and Richard J. Murphy, 1999, “Experimental investigation and modeling of citric acid effects on actinide speciation and transport.” Presented at the 7th International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, Lake Tahoe, CA. Lenhart, John J., John R. Bargar and James A. Davis, 1999, “Spectroscopic Evaluation of the Binding of Malonate to Hematite and its Affect on Lead Sorption.” Presented at the 1999 Geological Society of America Annual Meeting, Denver, CO. Lenhart, John J., Richard Murphy, Bruce D. Honeyman and Charoen Sanpawanitchakit, 1997, “The Effects of NOM on the Sorption of U(VI) and Th(IV) by Hematite.” Presented at the American Chemical Society National Convention, San Francisco, CA. Sanpawanitchakit, Charoen, John J. Lenhart and Bruce D. Honeyman, 1997, “A Study of the Role of NOM in Trace Metal Flux from Sediments using a Bench Scale Benthic Chamber.” Presented at the American Chemical Society National Convention, San Francisco, CA. Sanpawanitchakit, Charoen, John J. Lenhart and Bruce D. Honeyman, 1997, “The Role of Organic Acids in the Transport of U(VI) Across the Sediment/Water Interface.” Presented at the Chemical Oceanography Gordon Conference, Kendall Union Academy, NH. Murphy, Richard J., John J. Lenhart and Bruce D. Honeyman, 1997, "Binding of Thorium and Uranium to Natural Organic Matter." Presented at the American Chemical Society National Convention, Las Vegas, NV. Lenhart, John J. and Bruce D. Honeyman, 1997, "Determination of the Effects of Different Molecular Weight Fractions of NOM on the Binding of U(VI) by Hematite." Presented at the 1997 Geological Society of America Annual Meeting, Salt Lake City, UT. Lenhart, John J., Bruce D. Honeyman and Patrick MacCarthy, 1996, “The Role of NOM in the Sorption of Uranium by Hematite.” Presented at International Workshop on Interactions of Small Solutes with Materials of Environmental Relevance, Monte Verita, Ascona, Switzerland. Kaneko, David, John J. Lenhart, Linda Figueroa, Bruce D. Honeyman and Alex Shrinsky, 1995, “Removal of Uranium from aqueous solution by sorption on Animal Chitin: Design and Implementation of a Bench Scale System.” Presented at DOE Environmental Restoration Conference, Denver, Colorado. Kaneko, David, John J. Lenhart, Linda A. Figueroa and Bruce D. Honeyman, 1995, “Metal Adsorption on Biosurfaces: Animal Chitin as a Model Organic Surface.” Presented at International Congress of Pacific Basin Societies, Honolulu, Hawaii. Lenhart, John J., Leigh Alvarado-Benson, Linda A. Figueroa and Bruce D. Honeyman, 1993, "The Design and Testing of a CSTR System for U(VI) Treatment Which Couples Surface Chemistry, Reaction Kinetics, and Mass Transport." Presented at The American Chemical Society National Convention. Denver, Colorado.       [top]