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Sorption of Nitroaromatics by Ammonium- and Organic Ammonium-Exchanged Smectite: Shifts from Adsorption/Complexation to a Partition-Dominated Process

Published online by Cambridge University Press:  01 January 2024

Michael G. Roberts ,
Hui Li ,
Brian J. Teppen  and
Stephen A. Boyd
Michael G. Roberts
Affiliation:
Department of Crop and Soil Sciences, Environmental Science and Policy Program, Michigan State University, East Lansing, Michigan 48824-1325, USA
Hui Li
Affiliation:
Department of Crop and Soil Sciences, Environmental Science and Policy Program, Michigan State University, East Lansing, Michigan 48824-1325, USA
Brian J. Teppen
Affiliation:
Department of Crop and Soil Sciences, Environmental Science and Policy Program, Michigan State University, East Lansing, Michigan 48824-1325, USA
Stephen A. Boyd*
Affiliation:
Department of Crop and Soil Sciences, Environmental Science and Policy Program, Michigan State University, East Lansing, Michigan 48824-1325, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Nitroaromatic compounds (NACs) are components of munitions commonly found as soil contaminants at military training sites and elsewhere. These compounds pose possible threats to human health and ecological systems. Recent studies indicate that these compounds are strongly retained by smectite clays. The adsorption mechanisms are not fully reconciled, but it is known that the type of exchangeable cation strongly affects NAC affinity for smectites. This study examined the sorption of 1,3-dinitrobenzene, 2,4-dinitrotoluene and naphthalene from water by a smectite clay (SWy-2) saturated with ammonium, tetramethylammonium (TMA), trimethylphenylammonium (TMPA) and hexadecyltrimethylammonium (HDTMA). In all cases, we observed greater sorption of 2,4-dinitrotoluene compared with 1,3-dinitrobenzene. The sorption isotherms for 2,4-dinitrotoluene and 1,3-dinitrobenzene displayed a concave-downward curve for NH4-SWy-2 and TMA-SWy-2, whereas the isotherms for sorption of HDTMA-SWy-2 and TMPA-SWy-2 were essentially linear. The magnitude of sorption followed the order: NH4-SWy-2 > TMA-SWy-2 > TMPA-SWy-2 > HDTMA-SWy-2 for both compounds. The greater affinity of NACs for NH4- and TMA-SWy-2 is due in part to complex formation between the exchangeable cation and −NO2 groups. These clays also provide near optimal interlayer distances that approximate the molecular thickness of NACs hence promoting the simultaneous interaction of the planar aromatic rings with opposing siloxane surfaces and solute dehydration. Both processes are energetically favorable. In HDTMA-SWy-2, sorption of all solutes is via a partition-dominated process. Solute competition (diminished uptake of one solute in the presence of a second) was observed for TMA-SWy-2 but not HDTMA-SWy-2. This is consistent with an adsorptive mechanism for TMA-SWy-2 and a partitioning mechanism for HDTMA-SWy-2. This study demonstrates that the dominant molecular mechanism of NAC sorption by smectite changes fundamentally from complexation between −NO2 groups and the exchangeable cation (viz. NH4 and TMA) to partitioning for a systematic series of ammonium and quaternary ammonium cations in which the locus of positive charge (the central N atom) is progressively shielded by organic moieties of increasing size.

Keywords

MunitionsNitroaromatic CompoundsSmectiteSoil Contamination
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 4 , August 2006 , pp. 426 - 434
Copyright
Copyright © 2006, The Clay Minerals Society

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