Pulsed gas–liquid discharge plasma catalytic degradation of bisphenol A over graphene/Cd S:process parameters optimization and O_(3)activation mechanism analysis  

作　　者：姜楠 李学川 李举 李杰 廖兵 彭邦发 刘国 Nan JIANG;Xuechuan LI;Ju LI;Jie LI;Bing LIAO;Bangfa PENG;Guo LIU(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,People's Republic of China;Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education of the People's Republic of China,Dalian 116024,People's Republic of China;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Chengdu 610059,People's Republic of China)

机构地区：[1]School of Electrical Engineering,Dalian University of Technology,Dalian 116024,People's Republic of China [2]Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education of the People's Republic of China,Dalian 116024,People's Republic of China [3]State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Chengdu 610059,People's Republic of China

出　　处：《Plasma Science and Technology》2023年第10期81-90,共10页等离子体科学和技术（英文版）

基　　金：supported by the Open Fund for State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution(No.GHBK-2020-006);National Natural Science Foundation of China(No.21876070)。

摘　　要：In the present work,pulsed gas–liquid hybrid discharge plasma coupled with graphene/Cd S catalyst was evaluated to eliminate bisphenol A(BPA)in wastewater.The optimization of a series of process parameters was performed in terms of BPA degradation performance.The experimental results demonstrated that nearly 90%of BPA(20 mg l^(-1))in the synthetic wastewater(p H=7.5,σ=10μS m^(-1))was degraded by the plasma catalytic system over 0.2 g l^(-1)graphene/Cd S at 19k V with a 4 l min^(-1)air flow rate and 10 mm electrode gap within 60 min.The BPA removal rate increased with increasing the discharge voltage and decreasing the initial BPA concentration or solution conductivity.Nevertheless,either too high or too low an air flow rate,electrode gap,catalyst dosage or initial solution p H would lead to a decrease in BPA degradation.Moreover,optical emission spectroscopy was used to gain information on short-lived reactive species formed from the pulsed gas–liquid hybrid discharge plasma system.The results indicated the existence of several highly oxidative free radicals such as·O and·OH.Finally,the activation pathway of O_(3)on the catalyst surface was analyzed by density functional theory.

关 键 词：pulsed discharge gas-liquid discharge wastewater treatment parameters optimization DFT calculation 

分 类 号：O64[理学—物理化学]