A simple Cr(VI)-S(IV)-O2 system for rapid and simultaneous reduction of Cr(VI) and oxidative degradation of organic pollutants

Journal of Hazardous Materials
Yanan YuanFeng Wu

Abstract

Hexavalent chromium (Cr(VI)), a heavy-metal contaminant, can be easily reduced to less toxic trivalent chromium (Cr(III)) by sulfite ions (S(IV)). However, S(IV) has not drawn as much attention as the ferrous ion has. We report herein a novel Cr(VI)-S(IV)-O2 system containing sulfite ions that rapidly and simultaneously reduces Cr(VI) and oxidize organic pollutants in the presence of oxygen in aqueous solutions. This Cr(VI)-S(IV)-O2 system contains the initiator Cr(VI), the reductant S(IV), and the oxidant O2, which produce oxysulfur radicals (mainly SO4(-) and SO5(-)) and hydroxyl radicals (OH). The Cr(VI)/S(IV) molar ratio, pH, and oxygen content play important roles in the entire reaction system. Acidic conditions (pH 3.0) facilitated degradation of organic compounds and reduction of Cr(VI) as well. In addition, experiments of rapid degradation of several kinds of organic pollutants such as azo dye (acid orange 7, AO7), aniline, phenol, bisphenol A etc were also conducted. Preliminary results show that the removal rates of the analogs of phenols or aromatic amines in this Cr(VI)-S(IV)-O2 system have a relationship with the electronic parameters (Hammett constant, σ) of the substituted groups. Thus, the Cr(VI)-S(IV)-O2 system...Continue Reading

References

Jun 21, 2001·Environmental Science & Technology·C KimH Xu
May 5, 2009·Journal of Hazardous Materials·Ashwini C Poopal, R Seeta Laxman
Jul 9, 2011·The Science of the Total Environment·M Chrysochoou, A Ting
May 23, 2012·Journal of Hazardous Materials·Carlos E Barrera-DíazBryan Bilyeu
Sep 14, 2013·Ground Water·Kawalpreet Kaur, Michelle Crimi
Sep 24, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Ivan P PozdnyakovVictor F Plyusnin

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Citations

Mar 17, 2020·Applied Microbiology and Biotechnology·Amina ElahiAbdul Rehman
Jun 27, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tao LuoIvan P Pozdnyakov
Oct 11, 2017·Environmental Science & Technology·Long ChenFeng Wu

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