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Chemosphere

Title:		Assessment of green tea reductive degradation of halogenated solvents
Author(s):		Wu SC; Wang CW; Hsu LH; Liang C;
Address:		"Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung, 402, Taiwan. Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung, 402, Taiwan. Electronic address: cliang@nchu.edu.tw"
Journal Title:		Chemosphere
Year:		2021
Volume:		20201208
Issue:
Page Number:		129196 -
DOI:		10.1016/j.chemosphere.2020.129196
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"Green tea (GT) leaves can be brewed into a solution rich in polyphenols that serve as effective reducing agents, and the complexes formed by combining green tea with ferrous ion (GT/Fe(II)) can provide an elevated reduction potential. The dissociated GT polyphenols at alkaline pH can dramatically increase the formation of GT/Fe(II) complexes. This experimental work evaluated the reductive reactivity of alkaline GT solution and GT/Fe(II) complexes (at pH 10) on 14 halogenated volatile organic compounds (VOCs). Carbon tetrachloride (CT), with a highest carbon oxidation state (COS) of IV, was observed to be degradable by the alkaline GT solution, while all others proved ineffective. The GT/Fe(II) complexes are very reactive and capable of degrading halogenated methanes, ethanes, and ethenes, in which chemical structures exhibit zero or positive COS values, and the chlorine or bromine atom is bonded at the saturated carbon atom, such as CT, chloroform, bromoform, dibromomethane, 1,1,1-trichloroethane, and 1,1,1,2-tetrachloroethane. The linear free energy relationship (LFER) approach was used to determine the overall reduction potentials (E(H)(0)) of the alkaline GT solution and GT/Fe(II) complexes, which were found to be -0.131 V and -0.368 V, respectively. These findings demonstrated that GT/Fe(II) complexes exhibit the potential to remediate halogenated contaminants and the E(H)(0) information obtained in this study may serve as a reference in determining probable reactivity that contributes to degradation of environmental contaminants"
Keywords:		Carbon Tetrachloride *Iron Oxidation-Reduction Solvents *Tea Chlorinated solvents Green tea In situ chemical reduction (ISCR) Polyphenol Soil and groundwater remediation;
Notes:		"MedlineWu, Siang Chen Wang, Chi-Wei Hsu, Li-Hsin Liang, Chenju eng England 2020/12/20 Chemosphere. 2021 Mar; 267:129196. doi: 10.1016/j.chemosphere.2020.129196. Epub 2020 Dec 8"