Enhanced Removal of Hexavalent Chromium in the Presence of H2O2 in Frozen Aqueous Solutions

Environmental Science & Technology
Kitae KimJungwon Kim

Abstract

The reductive transformation of Cr(VI) to Cr(III) by H2O2 in ice was compared with that in water. The reduction of Cr(VI) was significant at -20 °C (ice), whereas the reduction efficiency was very low at 25 °C (water). This enhanced reduction of Cr(VI) in ice was observed over a wide range of H2O2 concentration (20-1000 μM), pH (3-11), and freezing temperature (-10 to -30 °C). The observed molar ratio of consumed [H2O2] to reduced [Cr(VI)] in ice was in close agreement with the theoretical (stoichiometric) molar ratio (1.5) for H2O2-mediated Cr(VI) reduction through proton-coupled electron transfer (PCET). The synergistic increase in Cr(VI) reduction in water by increasing the H2O2 and proton concentrations confirms that the freeze concentration of both H2O2 and protons in the liquid brine is primarily responsible for the enhanced Cr(VI) reduction in ice. In comparison, the one-electron reduction of Cr(VI) to Cr(V) and subsequent reoxidation of Cr(V) to Cr(VI) is the major reaction mechanism in aqueous solution. The reduction efficiency of Cr(VI) by H2O2 in the frozen aqueous electroplating wastewater was similar to that in the frozen aqueous deionized water, which verifies the enhanced reduction of Cr(VI) by freezing in real C...Continue Reading

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Citations

Mar 7, 2017·The Science of the Total Environment·Kitae KimJungwon Kim
Feb 13, 2017·Journal of Hazardous Materials·Jinjung JuJungwon Kim
Jun 15, 2017·Environmental Science & Technology·Xiu YuanJames A Davis
Aug 14, 2019·Environmental Science and Pollution Research International·Nan WangDan Shang
Apr 17, 2021·Journal of Colloid and Interface Science·Manoj P RayarothYoon-Seok Chang
May 7, 2021·The Science of the Total Environment·Yong-Yoon AhnKitae Kim
Nov 8, 2019·Environmental Science & Technology·Zhiqiang TanGuibin Jiang
May 14, 2019·Environmental Science & Technology·Kitae KimWonyong Choi
Apr 13, 2018·Environmental Science & Technology·Yejin ChoiJungwon Kim
Mar 28, 2019·Environmental Science & Technology·Kitae KimJungwon Kim

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