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Accelerated chromate reduction by tea waste: Comparison of chromate reduction properties between water and ice systems

Cited 2 time in wos
Cited 2 time in scopus
Title
Accelerated chromate reduction by tea waste: Comparison of chromate reduction properties between water and ice systems
Other Titles
차 폐기물에 의한 크롬 독성 감소 가속화 연구: 물과 얼음에서 독성크롬 감소 특성 비교
Authors
Han, Tae Uk
Kim, Jungwon
Kim, Kitae
Subject
Environmental Sciences & EcologyPublic, Environmental & Occupational Health
Keywords
Waste utilizationChromateIceLiquid-like layerFreezing
Issue Date
2021-06
Citation
Han, Tae Uk, Kim, Jungwon, Kim, Kitae. 2021. "Accelerated chromate reduction by tea waste: Comparison of chromate reduction properties between water and ice systems". ENVIRONMENTAL RESEARCH, 197: 1-11.
Abstract
The concentration of chromium (Cr) in natural water and soil environments has gradually increased in recent decades, owing to intensive use of Cr in industry and its subsequent disposal. In this study, we performed a comparison study on chromate (Cr6+) reduction by tea waste (green tea, black tea, red tea, and chamomile) in water (25 °C) and ice (-20 °C) to develop a new strategy for environmental-friendly stabilization of hazardous Cr6+ by freezing. This study shows that the freezing process can enhance the reduction of Cr6+ by tea waste. The residual Cr6+ concentration ratios (C/C0) by tea wastes in water were in the range of 0.71 (green tea) to 0.92 (chamomile); however, the ratios dramatically decreased under the freezing process (i.e., 0.06 by green tea, 0.13 by black tea, 0.18 by red tea, and 0.08 by green tea). According to the results obtained from the fluorescent, chromatographic, and spectroscopic analyses, under the freezing process, the enhanced reduction of Cr6+ could be explained by the freeze concentration of Cr6+, phenolic components in tea extracts, and protons in small liquid pockets in liquid-like layers (LLLs). In addition, the proposed system can efficiently purify the real Cr6+-containing wastewater (i.e., electroplating wastewater), indicating that the system will be economically feasible in cold regions (i.e., polar regions).
URI
https://repository.kopri.re.kr/handle/201206/13633
DOI
http://dx.doi.org/10.1016/j.envres.2021.111059
Type
Article
Station
기타()
Indexed
SCIE
Appears in Collections  
2021-2021, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (21-21) / Kim, Kitae (PE21120)
2020-2020, Development of potential candidates as antibiotics based on polar genetic resources (20-20) / Lee, Jun Hyuck (PM20030)
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