As(V) and Removal by an Iron-Impregnated Activated Carbon in a Single and Binary Adsorbate System: Experimental and Surface Complexation Modeling Results
Publication: Journal of Environmental Engineering
Volume 142, Issue 1
Abstract
The objective of this study was to predict As(V) removal by an iron-oxide impregnated carbon (L-Act, 9% Fe(III) amorphous iron-oxide) over a range of environmental conditions using the surface complexation modeling (SCM) approach. The L-Act surface sites and electric double layer were modeled using the two monoprotic site-diffuse layer model (2MDLM). As(V) and surface complexes were modeled as bidentate complexes at low hydrogen ion concentration (pH) and monodentate complexes at high pH. surface complexation constants were determined from a single pH-adsorbent edge, and these were used to effectively predict pH-dependent removal of As(V) and across a range of adsorbent/adsorbate ratios in single and binary adsorbate systems and from a National Sanitation Foundation challenge water. The 2MDLM also successfully predicted As(V) removal by three literature-based iron-based adsorbents: two iron-impregnated ion exchange resins (PWX5, 16% Fe; PWX3, 10% Fe) and a hydrous ferric oxide that was incorporated into a porous diatomite.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 15, 2013
Accepted: May 29, 2015
Published online: Aug 3, 2015
Published in print: Jan 1, 2016
Discussion open until: Jan 3, 2016
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