KOPRI Repository

Freezing-Induced Simultaneous Reduction of Chromate and Production of Molecular Iodine: Mechanism, Kinetics, and Practical Implications

Cited 0 time in wos
Cited 1 time in scopus
Metadata Downloads
Title
Freezing-Induced Simultaneous Reduction of Chromate and Production of Molecular Iodine: Mechanism, Kinetics, and Practical Implications
Other Titles
동결을 이용한 독성크롬 제거 및 유용 요오드 회수 연구
Authors
Kim, Kitae
Chung, Hyun Young
Kim, Bomi
Wong, Gracie
Nguyen, Anh Quoc Khuong
Kim, Saewung
Kim, Jungwon
Subject
Engineering; Environmental Sciences & Ecology
Keywords
Chromate removal; Electroplating wastewater; Freezing; dual-function system; iodine production
Issue Date
2020-12
Citation
Kim, Kitae, et al. 2020. "Freezing-Induced Simultaneous Reduction of Chromate and Production of Molecular Iodine: Mechanism, Kinetics, and Practical Implications". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 54(24): 16204-16211.
Abstract
A new method for the concurrent treatment of Cr(VI)-contaminated wastewater and production of the useful I2 chemical was developed. The method is based on the redox reaction between Cr(VI) and I? that occurs when an aqueous wastewater solution containing Cr(VI) and I? is frozen, producing I2 and allowing for the effective removal of Cr. The redox reaction occurs primarily due to the accumulation of Cr(VI), I?, and protons in the ice grain boundaries formed during freezing (i.e., the freeze concentration effect). This effect was verified by confocal Raman spectroscopy and the experiments varying I? concentration and pH. The reduction of Cr(VI) (20 μM) was near complete after freezing at I? concentrations ≥ 100 μM, pH ≤ 3.0, and temperatures ≤ ?10 °C. The freezing method (liquid cooling vs air cooling) had little effect on the final Cr(VI) reduction efficiency, but had a significant effect on the Cr(VI) reduction rate. The freezing method was also tested with Cr(VI)-contaminated electroplating wastewater samples and simultaneous Cr(VI) reduction and I2 production proceeded rapidly in a frozen solution but was not observed in an aqueous solution. Additionally, other substances in electroplating wastewater did not reduce the rate and final efficiency of Cr(VI) reduction and I2 production. Therefore, the freezing/Cr(VI)/I? system can be considered a feasible approach to water-energy nexus technology for simultaneous I2 production and Cr(VI)-contaminated wastewater treatment.
URI
https://repository.kopri.re.kr/handle/201206/11818
DOI
http://dx.doi.org/10.1021/acs.est.0c05322
Appears in Collections  
2020-2020, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (20-20) / Kim, Kitae (PE20030)
2020-2020, Development of potential candidates as antibiotics based on polar genetic resources (20-20) / Lee, Jun Hyuck (PM20030)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse