Comparison of different chelating agents to enhance reductive Cr(VI) removal by pyrite treatment procedure

Water Research
Cetin KantarSelda Keskin

Abstract

New technologies involving in-situ chemical hexavalent chromium [Cr(VI)] reduction to trivalent chromium [Cr(III)] with natural Fe(II)-containing minerals can offer viable solutions to the treatment of wastewater and subsurface systems contaminated with Cr(VI). Here, the effects of five different chelating agents including citrate, EDTA, oxalate, tartrate and salicylate on reductive Cr(VI) removal from aqueous systems by pyrite were investigated in batch reactors. The Cr(VI) removal was highly dependent on the type of ligand used and chemical conditions (e.g., ligand concentration). While salicylate and EDTA had no or little effect on Cr(VI) removal, the ligands including citrate, tartrate and oxalate significantly enhanced Cr(VI) removal at pH < 7 relative to non-ligand systems. In general, the efficiency of organic ligands on Cr(VI) removal decreased in the order: citrate ≥ oxalate ≈ tartrate > EDTA > salicylate ≈ non-ligand system. Organic ligands enhanced Cr(VI) removal by 1) removing surface oxide layer via the formation of soluble Fe-Cr-ligand complexes, and 2) enhancing the reductive iron redox cycling for the regeneration of new surface sites. While citrate, oxalate and tartrate eliminated the formation of surface Cr (I...Continue Reading

References

Sep 21, 2007·Journal of Colloid and Interface Science·Frédéric DemoissonBernard Humbert
Nov 21, 2007·Chemosphere·Yeqing LanJun Sun
Apr 18, 2009·Journal of Hazardous Materials·Jun SunYeqing Lan

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Citations

Jul 4, 2016·Journal of Environmental Sciences (China)·Guohong QiuChengshuai Liu
Jul 9, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Cetin Kantar
Sep 7, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Haoran DongGuangming Zeng
Aug 25, 2019·Environmental Science and Pollution Research International·Na LiFenglian Fu
Mar 3, 2020·Frontiers in Microbiology·Xinxing LiuGuanzhou Qiu
Oct 1, 2017·Journal of Hazardous Materials·Xiaolei LiuQiang Zeng
Dec 19, 2019·Journal of Hazardous Materials·Bingdang WuShujuan Zhang
Nov 7, 2019·Environmental Science & Technology·Xiaolei LiuDonglei Zhang

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