The role of Al-goethites on arsenate mobility

Water Research
Juscimar SilvaTony Jong

Abstract

The geochemical fates of Fe and As are so closely correlated that methods of As removal from contaminated water are in general based on the high affinity of this metalloid for Fe (hydr)oxides. Dissimilatory Fe reducing bacteria, however, play a fundamental role in catalysing the redox transformations that ultimately control the mobility of As in anoxic environments. The potential of Al-goethites in adsorbing As(V) compared with hematite, goethite, ferrihydrite, and gibbsite, and the stability of As retained by the Fe compounds under anoxic conditions were investigated in this study. The (hydr)oxides were synthesised, and adsorption isotherms and As(V) adsorption maxima at different pH were measured. Arsenic loaded samples were anaerobically incubated in the presence of Shewanella putrefaciens, and periodically sampled to evaluate the contents of soluble As and Fe. The As(V) adsorption maxima decreased in the following order: Fh > AlGt(13) > AlGt(20) > AlGt(23) > Gb > Hm > Gt. In terms of surface area, Gb, Gt, and Hm showed higher As(V) loading capacity than Fh, suggesting available reactive sites not fully occupied by arsenate on Fh. The same hypothesis can be considered for Al-goethites, as they showed even lower arsenate load...Continue Reading

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Citations

Sep 7, 2013·Journal of Hazardous Materials·Wei JiangShuzhen Zhang
Aug 30, 2011·Journal of Environmental Management·Dion E GilesPritam Singh
Feb 13, 2015·Archives of Environmental Contamination and Toxicology·Patrícia Sueli RezendeCláudia Carvalhinho Windmöller
Dec 3, 2013·Environmental Science & Technology·Yandi HuYoung-Shin Jun
Feb 27, 2018·Environmental Science and Pollution Research International·Isabela C F VasquesWalter A P Abrahão
Dec 5, 2018·Journal of Environmental Quality·Isabela C F VasquesWalter A P Abrahão
Jul 8, 2020·Bulletin of Environmental Contamination and Toxicology·Liyang ZhangYuanyuan Liu
May 2, 2018·Environmental Science and Pollution Research International·Gisely S BarcelosMassimo Gasparon
Jan 31, 2021·Environmental Pollution·Daphne C AntônioVirginia S T Ciminelli
Jul 13, 2021·Journal of Hazardous Materials·Taiane G F SouzaVirginia S T Ciminelli
Aug 13, 2021·The Science of the Total Environment·Yu LiangWenfeng Tan

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