Silica Adsorbents and Peroxide Functionality for Removing Paraquat from Wastewater
Publication: Journal of Environmental Engineering
Volume 139, Issue 7
Abstract
To treat wastewater containing paraquat, the interaction of the herbicide with unmodified and modified (i.e., chemically treated) proprietary silicas is explored using liquid chromatography—mass spectrometry and ultraviolet-visible spectrometry. Strong adsorption and rapid exchange kinetics (i.e., more than 80% within 30 s) of the contaminant onto both unmodified and modified silica surfaces indicate that paraquat adsorption is inherent to the unmodified silica. Although activated carbon sequesters paraquat more effectively than silica at long times (i.e., after 2 h), considering both constant mass and constant area approaches in loading the adsorbents, the best performance in the short-term (i.e., at least up to 150 s) interaction was achieved by using unmodified silicas. Comparison of data fitting to a competitive binding model with or without consideration of homogeneous solid diffusion indicates that, at least for times relevant to water-treatment applications, the competitive binding model is an appropriate mathematical tool to explain experimental adsorption data. Addition of is also attempted to initiate paraquat decomposition; however, silica is not an effective catalyst for peroxide decomposition paraquat.
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Acknowledgments
This material is based upon work supported by the Engineer Research and Development Center–Construction Engineering Regulation Laboratory (ERDC-CERL) under Contract No. W9132T-09-C-0046. Work was further supported and, in part, collaboratively guided by PPG Industries. Sincere acknowledgment is given to Professor Kenneth Suslick, Maryam Sayyah, Edward Chainani, and Furong Sun from the School of Chemical Sciences, and Dr. Glennys A. Mensing from the Department of Mechanical Science and Engineering at the University of Illinois at Urbana Champaign, for their continued support in providing the logistics and scientific infrastructure required to conduct this research.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 139 • Issue 7 • July 2013
Pages: 975 - 985
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 10, 2012
Accepted: Jan 30, 2013
Published online: Feb 1, 2013
Published in print: Jul 1, 2013
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