Competitive Adsorption of As, and PO.sub.4 by an Iron Oxide Impregnated Activated Carbon: Surface Complex Modeling

The objective of this study was to predict the competitive adsorption of As(III), As(V), and PO.sub.4 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. L-Act surface complexati...

Full description

Saved in:
Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2020-09, Vol.231 (9)
Main Authors: Ngantcha-Kwimi, T. Angele, Reed, Brian E
Format: Article
Language:English
Subjects:
Adsorption
Analysis
Ferric oxide
Iron compounds
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The objective of this study was to predict the competitive adsorption of As(III), As(V), and PO.sub.4 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. L-Act surface complexation constants determined from a single pH-adsorption edge were used to predict pH-dependent competitive removal in singular, binary, and tertiary adsorbate systems. As(III), As(V), and PO.sub.4 complexes were modeled as bidentate binuclear species at low pH and monodentate species at high pH using the two monoprotic surface site/diffuse electric double layer model (2MDLM). F values determined based on 2MDLM predictions were close to those calculated by FITEQL (a statistical optimization program) demonstrating the effectiveness of the 2MDLM in describing adsorption behavior. F values were generally in the recommended range of 0.1-20 indicating a good fit between the data and the model. The 2MDLM also successfully predicted As(III)/As(V)/PO.sub.4 adsorption data of hydrous ferric oxide and goethite adsorbents from the literature.
ISSN:0049-6979
DOI:10.1007/s11270-020-04853-y