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Enhanced reduction of hexavalent chromium by hydrogen sulfide in frozen solution

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Title
Enhanced reduction of hexavalent chromium by hydrogen sulfide in frozen solution
Other Titles
얼음 내 2가철에 의한 독성 크롬 제거기작 연구
Authors
Nguyen, Quoc Anh
Kim, Bomi
Chung, Hyun Young
Kim, Jungwon
Kim, Kitae
Subject
Engineering
Keywords
Hexavalent chromium; Hydrogen sulfide; Freeze concentration effect; Electroplating wastewater; Ice chemistry
Issue Date
2020-11
Citation
Nguyen, Quoc Anh, et al. 2020. "Enhanced reduction of hexavalent chromium by hydrogen sulfide in frozen solution". SEPARATION AND PURIFICATION TECHNOLOGY, 251(1): 117377-117383.
Abstract
Significant enrichment of hexavalent chromium [Cr (VI)] has been detrimentally influenced both environment and human's health in the polar regions. We found that reduction of Cr (VI) by hydrogen sulfide (H2S) was significantly enhanced in ice (-20 degrees C) but relatively slow in water (25 degrees C) under the same experimental conditions. This enhancement is ascribed to the freeze concentrations of Cr (VI), H2S, and proton (H+) in ice grain boundaries during freezing. Sulfate (SO42-) was produced more appreciably in ice than in water. Cr (VI) reduction in ice was enhanced effectively under various H2S concentrations (5.0-100 mu M), pHi (2.0-7.7), and increasing the freezing temperature from -30 to -15 degrees C. Optical and chemical observations with a confocal Raman microscope under frozen state supported the freeze concentration of Cr (VI) in ice grain boundaries. The accumulation of H+ (pH decrease) in ice grain boundaries was verified with the UV-visible absorption spectra of cresol red (CR) in ice. Removal of Cr (VI) in electroplating wastewater was significant and comparable to that in distilled water by freezing. Therefore, Cr (VI) reduction by H2S in ice phase indicates the occurrence of Cr (VI) removal in cold regions.
URI
https://repository.kopri.re.kr/handle/201206/11860
DOI
http://dx.doi.org/10.1016/j.seppur.2020.117377
Appears in Collections  
2020-2020, Development of potential candidates as antibiotics based on polar genetic resources (20-20) / Lee, Jun Hyuck (PM20030)
2020-2020, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (20-20) / Kim, Kitae (PE20030)
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