Selective removal of toxic Cr(VI) from aqueous solution by adsorption combined with reduction at a magnetic nanocomposite surface

Journal of Colloid and Interface Science
Nazia H KeraArjun Maity

Abstract

The adsorption of toxic hexavalent chromium (Cr(VI)) and its reduction to trivalent chromium (Cr(III)) are important processes for the treatment of industrial wastewater. Conducting polymers can adsorb and reduce Cr(VI) to less toxic Cr(III) but have low adsorption capacities due to agglomeration of particles and are difficult to separate from treated water. In this study, magnetic polypyrrole (PPy)-polyaniline (PANI)/iron oxide (Fe3O4) nanocomposite was synthesized for the selective removal of Cr(VI) in aqueous solution. PPy-PANI/Fe3O4 nanocomposite was characterized using various techniques including ATR-FTIR, FE-SEM, HR-TEM, EDX, TGA, XRD, VSM and XPS analyses. PPy-PANI/Fe3O4 nanocomposite (0.05g) removed 99% of Cr(VI) from aqueous solution (100mg/L, pH 2). Speciation studies confirmed Cr(VI) adsorption and reduction to Cr(III) by the PPy-PANI/Fe3O4 nanocomposite in solutions with initial pH of 2 and 3 and that no Cr(VI) reduction occurred at pH values of 4 and above. The Langmuir maximum adsorption capacity for Cr(VI) removal by PPy-PANI/Fe3O4 nanocomposite at pH 2 was 303mg/g at 25°C. PPy-PANI/Fe3O4 nanocomposite was highly selective for Cr(VI) removal and could be used for three consecutive treatment cycles without loss o...Continue Reading

Citations

May 4, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhimin LvLei Chen
Jan 8, 2018·Environmental Science and Pollution Research International·Yilin JiangQingyun He
Dec 29, 2019·International Journal of Environmental Research and Public Health·Linfeng JinLiyuan Zhang
Jan 18, 2020·Environmental Science and Pollution Research International·Ziheng YangHuanran Hu
Nov 21, 2020·Environmental Science and Pollution Research International·Xiuxiu ZhangChuanxiang Zhang
Jun 30, 2019·Environment International·Hubdar Ali MaitloJae-Woo Park
Dec 29, 2020·Journal of Environmental Management·Kingsley Eghonghon UkhureborIsrael Uzuazor Siloko
Aug 14, 2021·Journal of Colloid and Interface Science·Xiancheng ShiYihe Zhang
Sep 1, 2021·International Journal of Phytoremediation·Junjun WangLi Shen
Aug 14, 2020·Journal of Environmental Management·Alireza HosseinkhaniMajid Baghdadi

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