Rapid Degradation of Carbon Tetrachloride by Microscale Ag/Fe Bimetallic Particles

Xueqiang Zhu, Lai Zhou, Yuncong Li, Baoping Han and Qiyan Feng
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Xueqiang Zhu: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Lai Zhou: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Yuncong Li: Department of Soil and Water Sciences, Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA
Baoping Han: School of Geography & Geomatics and Urban-Rural Planning, Jiangsu Normal University, Xuzhou 221116, China
Qiyan Feng: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

IJERPH, 2021, vol. 18, issue 4, 1-15

Abstract: Cost-effective zero valent iron (ZVI)-based bimetallic particles are a novel and promising technology for contaminant removal. The objective of this study was to evaluate the effectiveness of CCl 4 removal from aqueous solution using microscale Ag/Fe bimetallic particles which were prepared by depositing Ag on millimeter-scale sponge ZVI particles. Kinetics of CCl 4 degradation, the effect of Ag loading, the Ag/Fe dosage, initial solution pH, and humic acid on degradation efficiency were investigated. Ag deposited on ZVI promoted the CCl 4 degradation efficiency and rate. The CCl 4 degradation resulted from the indirect catalytic reduction of absorbed atomic hydrogen and the direct reduction on the ZVI surface. The CCl 4 degradation by Ag/Fe particles was divided into slow reaction stage and accelerated reaction stage, and both stages were in accordance with the pseudo-first-order reaction kinetics. The degradation rate of CCl 4 in the accelerated reaction stage was 2.29–5.57-fold faster than that in the slow reaction stage. The maximum degradation efficiency was obtained for 0.2 wt.% Ag loading. The degradation efficiency increased with increasing Ag/Fe dosage. The optimal pH for CCl 4 degradation by Ag/Fe was about 6. The presence of humic acid had an adverse effect on CCl 4 removal.

Keywords: microscale bimetallic Ag/Fe; carbon tetrachloride; degradation; reaction kinetics (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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