Effective degradation of 1,2-dichloroethane in calcium peroxide activated by Fe(III): performance and mechanisms
Zhanpeng Lu,
Guilu Zeng,
Zhengyuan Zhou,
Yulong Liu,
Peng Wang,
Xianxian Sheng,
Jiaqi Dong,
Ayesha Idress,
Qian Sui,
Shuguang Lyu
Affiliations
Zhanpeng Lu
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Guilu Zeng
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Zhengyuan Zhou
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Yulong Liu
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Peng Wang
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Xianxian Sheng
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Jiaqi Dong
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Ayesha Idress
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Qian Sui
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
Shuguang Lyu
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
As a kind of refractory chlorinated hydrocarbon, 1,2-dichloroethane (1,2-DCA) has been frequently detected in contaminated groundwater, and it is hard for common technology to degrade it due to its stability. Moreover, the existence of 1,2-DCA can do harm to human organs. Hence, it is urgent to develop an effective technology for the remediation of 1,2-DCA-contaminated groundwater. In this study, a calcium peroxide (CaO2) system activated by Fe(III) was applied to the degradation of 1,2-DCA and 83.3% of 1,2-DCA could be effectively removed within 3 h when the molar ratio of CaO2/Fe(III)/1,2-DCA was 30/120/1. The results of probe experiments, electron paramagnetic resonance (EPR) detection, and scavenging tests demonstrated that both HO• and O2−• were the key factors for 1,2-DCA degradation. The released amount of Cl− (84.1%) revealed that most of the chlorine in 1,2-DCA could be dechlorinated. GC-MS was applied for the detection of intermediates during 1,2-DCA degradation and the possible degradation pathway was proposed that 1,2-DCA was first reduced to vinyl chloride (VC) and then oxidized to CO2 and H2O. Finally, 73.4% removal of 1,2-DCA could be achieved in actual groundwater when the molar ratio of CaO2/Fe(III)/1,2-DCA was 100/400/1, demonstrating that the CaO2/Fe(III) system has a remarkable prospect in 1,2-DCA-contaminated groundwater remediation. HIGHLIGHTS Efficient degradation of 1,2-DCA in the CaO2/Fe(III) system was achieved.; HO• and O2–• were the key factors for 1,2-DCA removal in the CaO2/Fe(III) system.; The possible degradation pathway of 1,2-DCA was proposed.; The effect of water matrices on 1,2-DCA degradation in the CaO2/Fe(III) system was investigated.;
