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

Cited 42 time in wos
Cited 41 time in scopus

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dc.contributor.authorKim, Kitae-
dc.contributor.authorKim, Jaesung-
dc.contributor.authorBokare, Alok D.-
dc.contributor.authorChoi, Wonyong-
dc.contributor.authorYoon, Ho Il-
dc.contributor.authorKim, Jungwon-
dc.date.accessioned2017-08-03T14:08:07Z-
dc.date.available2017-08-03T14:08:07Z-
dc.date.issued2015-
dc.description.abstractThe reductive transformation of Cr(VI) to Cr(III) by H<sub>2</sub>O<sub>2</sub 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 H<sub>2</sub>O<sub>2</sub> 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 H<sub>2</sub>O<sub>2</sub> -mediated Cr(VI) reduction through proton-coupled electron transfer (PCET). The synergistic increase in Cr(VI) reduction in water by increasing the H<sub>2</sub>O<sub>2</sub> and proton concentrations confirms that the freeze concentration of both H<sub>2</sub>O<sub>2</sub> 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 H<sub>2</sub>O<sub>2</sub> 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 Cr(VI)-contaminated aquatic systems.-
dc.languageEnglish-
dc.subjectEngineering-
dc.subjectEnvironmental Sciences & Ecology-
dc.titleEnhanced Removal of Hexavalent Chromium in the Presence of H2O2 in Frozen Aqueous Solutions-
dc.typeArticle-
dc.identifier.bibliographicCitationKim, Kitae, et al. 2015. "Enhanced Removal of Hexavalent Chromium in the Presence of H2O2 in Frozen Aqueous Solutions". <em>Environmental Science & Technology</em>, 49: 10937-10944.-
dc.citation.titleEnvironmental Science & Technology-
dc.citation.volume49-
dc.citation.page10937-10944.-
dc.identifier.doi10.1021/acs.est.5b02702-
dc.identifier.scopusid2-s2.0-84941729899-
dc.identifier.wosid000361415800022-
Appears in Collections  
2014-2016, Monitoring of Abrupt Environmental Change in The Ice Shelf System and Reconstruction of Quaternary Deglaciation History in West Antarctica (14-16) / Yoon; Ho Il (PP15010; PP16010; PP14010)
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