Degradation Characteristics of Carbon Tetrachloride by Granular Sponge Zero Valent Iron

Xueqiang Zhu, Yuncong Li, Baoping Han, Qiyan Feng and Lai Zhou
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Xueqiang Zhu: 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
Lai Zhou: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

IJERPH, 2021, vol. 18, issue 23, 1-13

Abstract: Granular sponge zero valent iron (ZVI) was employed to degrade carbon tetrachloride (CCl 4 ). The effects of acidic washing, initial solution pH, and ZVI dosage on CCl 4 degradation were investigated. Results showed that CCl 4 was effectively removed by ZVI and approximately 75% of CCl 4 was transformed into chloroform through hydrogenolysis. The rate of chloroform transformation was slower compared to that of CCl 4 , resulting in chloroform accumulation. CCl 4 degradation was a pseudo first-order process. The observed pseudo first-order reaction rate constant ( k obs ) for CCl 4 and chloroform were 0.1139 and 0.0109 h −1 , respectively, with a ZVI dosage of 20 g/L and an initial CCl 4 concentration of 20 mg/L. Surface acidic washing had a negligible effect on CCl 4 degradation with ZVI. The k obs for CCl 4 degradation increased linearly with increasing ZVI dosage and the optimal dosage of ZVI was 20 g/L based on the surface area-normalized rate constants. The negative relationship between k obs and the solution pH indicated that the degradation of CCl 4 by ZVI performed better under weakly acidic conditions.

Keywords: granular sponge iron; carbon tetrachloride; reductive dechlorination; chloroform (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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