Efficient H_(2)O_(2)Electrosynthesis and Its Electro-Fenton Application for Refractory Organics Degradation  

作　　者：Lei Li Jing Bai Panyu Jiang Yan Zhang Tingsheng Zhou Jiachen Wang Changhui Zhou Jinhua Li Baoxue Zhou 

机构地区：[1]School of Environmental Science and Engineering,Key Laboratory of Thin Film and Microfabrication Technology(Ministry of Education),Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China

出　　处：《Engineering》2023年第11期131-143,共13页工程（英文）

基　　金：National Natural Science Foundation of China(22176125,52200103 and22178220);China Postdoctoral Science Foundation(2022 M722081 and 2021 M692064);the Fundamental Research Funds for the Central Universities;the Center for Advanced Electronic Materials and Devices and the instrumental Analysis Center,School of Environmental Science and Engineering,Shanghai Jiao Tong University for support。

摘　　要：Hydrogen peroxide(H_(2)O_(2))in situ electrosynthesis by O_(2)reduction reaction is a promising alternative to the conventional Fenton treatment of refractory wastewater.However,O_(2)mass transfer limitation,cathodic catalyst selectivity,and electron transfer in O_(2)reduction remain major engineering obstacles.Here,we have proposed a systematic solution for efficient H_(2)O_(2)generation and its electro-Fenton(EF)application for refractory organic degradation based on the fabrication of a novel ZrO_(2)/CMK-3/PTFE cathode,in which polytetrafluoroethylene(PTFE)acted as a hydrophobic modifier to strengthen the O_(2)mass transfer,ZrO_(2)was adopted as a hydrophilic modifier to enhance the electron transfer of O_(2)reduction,and mesoporous carbon CMK-3 was utilized as a catalyst substrate to provide catalytic active sites.Moreover,feasible mass transfer of O_(2)from the hydrophobic to the hydrophilic layer was designed to increase the contact between O_(2)and the reaction interface.The H_(2)O_(2)yield of the ZrO_(2)/CMK-3/PTFE cathode was significantly improved by approximately 7.56 times compared to that of the co nventional gas diffusion cathode under the same conditions.The H_(2)O_(2)generation rate and Faraday efficiency reached125.98 mg·cm^(-2)·h^(-1)(normalized to 5674.04 mmol·g^(-1)·h^(-1)by catalyst loading)and 78.24%at-1.3 V versus standard hydrogen electrode(current density of-252 mA·cm^(-2)),respectively.The high H_(2)O_(2)yield ensured that sufficient OH was produced for excellent EF performance,resulting in a degradation efficiency of over 96%for refractory organics.This study offers a novel engineering solution for the efficient treatment of refractory wastewater using EF technology based on in situ high-yield H_(2)O_(2)electrosynthesis.

关 键 词：Hydrogen peroxide Hydrophilic/hydrophobic interface MODIFICATION ELECTRO-FENTON Refractory organics 

分 类 号：X505[环境科学与工程—环境工程] O643.36[理学—物理化学] TQ123.6[理学—化学]