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Equilibrium Modeling of Arsenic Adsorption in a Ternary Arsenic–Iron Oxide–Natural Organic Matter System
Author(s) -
Fakour Hoda,
Lin TsairFuh,
Lo ShangLien
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201500962
Subject(s) - sorption , arsenic , adsorption , ternary operation , chemistry , iron oxide , langmuir adsorption model , organic matter , natural organic matter , humic acid , oxide , inorganic chemistry , environmental chemistry , organic chemistry , fertilizer , computer science , programming language
The effect of natural organic matter (NOM) on the adsorption efficiency of arsenic (As) species by iron oxide‐based adsorbent (IBA) under different concentrations was investigated. To evaluate the sorption of As in the presence of humic materials, simple isotherm curves should be replaced by three‐dimensional sorption isotherm surfaces. In this study, a modified Langmuir‐type model was developed to describe the isotherm surfaces. The proposed model showed satisfactory predictions for the As uptake in different scenarios with the presence of As(V)/(III), organic matter fractions, and model adsorbent. The isotherms indicated a competitive uptake of the As species and humic substances, causing that less As was adsorbed on the adsorbent. The developed model for the ternary sorption system enabled quantitative estimation of As sorption onto iron oxide based adsorbents in complex natural water systems.