Electrochemical Dechlorination of Trichloroethylene by Manganese Phthalocyanine: Performance and Mechanisms

  • Jia Deng School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China
  • Zheng Fang School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China
  • Yitao Dai Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
  • Lizhi Huang School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China
Keywords: Electrochemical, dechlorination, TCE, MnPc, DFT

Abstract

Trichloroethylene (TCE) is one of the most abundant persistent organic pollutant in subsurface environment. TCE can be reduced electrochemically, but the extremely negative applied potential limits the application of this technology. Manganese phthalocyanine (MnPc) catalyst was used for the electrochemical reductive dechlorination of TCE. The results show that MnPc can be reduced by electrons attachment at −-0.21 V, −-1.22 V and −-1.77 V, respectively. With the decrease of applied potential from −-0.3 V to −-1.8 V, the transformation from TCE to dichloroethylene (DCE) efficiency increased from 19.9% to 41.8% after 5 hours of reaction. Although the electron transfer ability was enhanced with applied potential decreasing, the intensive HER caused the electron selectivity decreased when MnPc attached more electrons. MnPc catalyze the electrochemical reduction of TCE, which has potential application on the remediation of TCE-contaminated groundwater.

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Author Biographies

Jia Deng, School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China

Jia Deng is an Eng.D. student at the school of civil engineering Wuhan University since autumn 2019. He received his bachelor of engineering degree from Shihezi University in 2016. He received his master of engineering degree from Hefei University of Technology in 2019. His research interests include reductive dehalogenation of halogenated pollutants, iron-based environmental materials and advanced oxidation process. Email: Jagger@whu.edu.cn.

Zheng Fang, School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China

Zheng Fang, corresponding author, received his master of engineering degree from Xi’an University of Architecture and Technology and obtained a Ph.D. from Wuhan University. He is currently a doctoral supervisor of Wuhan University, a member of the National Steering Committee of Water Supply and Drainage Science and Engineering of Higher Education Institutions, director of Hubei Urban Comprehensive Disaster Prevention and Fire Rescue Engineering Technology Research Center. He is a member of the Building Water Supply and Drainage Committee of the Architectural Society, a member of the Fire Safety Engineering Sub-Committee of the National Standardization Committee and an expert member of the China Water Supply and Drainage Pipeline Association. His main research directions are: building water supply and drainage and fire protection, municipal pipeline network and sponge city, municipal engineering disaster prevention and mitigation. Email: zfang@whu.edu.cn.

Yitao Dai, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China

Yitao Dai, received his master of science degree from Dalian University of Technology and obtained a Ph.D. from Aarhus University. He was a postdoctoral researcher at Max-Planck-Institute in Germany and was awarded the title of “Humboldt Scholar”. He joined University of Science and Technology of China Suzhou Institute for Advanced Research in August 2021. His research direction is heterogeneous catalysis. Email: yitaodai@ustc.edu.cn.

Lizhi Huang, School of Civil Engineering, Wuhan University, Wuhan, Hubei, 430072, China

Lizhi Huang, received his master of engineering from Huazhong University of Science and Technology and obtained a Ph.D. from University of Copenhagen. He is currently a doctoral supervisor of Wuhan University, a high-level talent in Hubei Province, a member of the Youth Committee of China Water Association, and a member of the International Water Association. His research interests are iron environmental chemistry and water pollution control. Email: huanglizhi1984@foxmail.com.

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Published
2022-02-04
Section
New Technologies and Strategies for Sustainable Development