Effects of pH, dissolved oxygen, and aqueous ferrous iron on the adsorption of arsenic to lepidocrocite

Journal of Colloid and Interface Science
Lin Wang, Daniel E Giammar

Abstract

The adsorption of arsenic to iron oxyhydroxides strongly depends on water chemistry. Iron(III) oxyhydroxides can also participate in the oxidation of As(III) to As(V), which changes arsenic's toxicity and adsorption behavior. As(III) and As(V) adsorption to lepidocrocite (γ-FeOOH) were examined in batch experiments that explored the effects of lepidocrocite dose, pH, availability of dissolved oxygen, and the presence of aqueous Fe(II) on adsorption. Lepidocrocite is an iron oxyhydroxide found in soils, and it is one of the major products of iron electrocoagulation for water treatment. A surface complexation model was able to describe the adsorption of both As(III) and As(V) to lepidocrocite over a broad range of conditions. The concentration and oxidation states of arsenic in solution were measured over the course of the reactions. At both oxic and anoxic conditions, As(III) was oxidized to As(V) in systems that contained lepidocrocite together with Fe(II); this oxidation led to overall enhanced arsenic adsorption at near neutral pH. With oxygen the pH-dependent generation of oxidants from the Fenton reaction drove the As(III) oxidation. In the absence of oxygen the As(III) was probably oxidized by Fe(III) in lepidocrocite that...Continue Reading

References

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Citations

Feb 27, 2018·Environmental Science and Pollution Research International·Isabela C F VasquesWalter A P Abrahão
Aug 30, 2020·Bulletin of Environmental Contamination and Toxicology·Hao-Jie CuiWeijun Zhou
Sep 21, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Di ZhangYiqun Xu
Feb 19, 2020·Environmental Science and Pollution Research International·Xiangyu KongGang Yu
Dec 5, 2018·Journal of Environmental Quality·Isabela C F VasquesWalter A P Abrahão
Jul 1, 2020·Environmental Geochemistry and Health·Guowei ChengWei Gao
Nov 21, 2020·Environmental Pollution·Jurate KumpieneMichel Mench
Aug 3, 2020·Journal of Hazardous Materials·Reto Gubler, Laurel K ThomasArrigo
Jul 17, 2021·Water Research·Md AnnaduzzamanDoris van Halem
Feb 7, 2018·Environmental Science & Technology·Luiza NotiniMichelle M Scherer
May 24, 2019·Environmental Science & Technology·Lucien StolzeMassimo Rolle
Feb 23, 2020·Environmental Science & Technology·Jeffrey Paulo PerezLiane G Benning
Nov 29, 2021·The Science of the Total Environment·Qi LiHongwen Sun

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