Synergistically S/N self-doped biochar as a green bifunctional cathode catalyst in electrochemical degradation of organic pollutant  

作　　者：Xuechun Wang Huizhong Wu Jiana Jing Ge Song Xuyang Zhang Minghua Zhou Raf Dewil 

机构地区：[1]Key Laboratory of Pollution Process and Environmental Criteria,Ministry of Education,College of Environmental Science and Engineering,Nankai University,Tianjin,300350,China [2]Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution,Nankai University,Tianjin,300350,China [3]Tianjin Advanced Water Treatment Technology International Joint Research Center,College of Environmental Science and Engineering,Nankai University,Tianjin,300350,China [4]Department of Chemical Engineering,KU Leuven,J.De Nayerlaan 5,Sint-Katelijne-Waver B,2860,Belgium

出　　处：《Green Energy & Environment》2025年第1期214-230,共17页绿色能源与环境（英文版）

基　　金：financially supported by National Key R&D Program International Cooperation Project(2023YFE0108100);Natural Science Foundation of China(No.52170085);Key Project of Natural Science Foundation of Tianjin(No.21JCZDJC00320);Tianjin Post-graduate Students Research and Innovation Project(2021YJSB013);Fundamental Research Funds for the Central Universities,Nankai University.

摘　　要：Biomass-derived heteroatom self-doped cathode catalysts has attracted considerable interest for electrochemical advanced oxidation processes(EAOPs)due to its high performance and sustainable synthesis.Herein,we illustrated the morphological fates of waste leaf-derived graphitic carbon(WLGC)produced from waste ginkgo leaves via pyrolysis temperature regulation and used as bifunctional cathode catalyst for simultaneous H_(2)O_(2) electrochemical generation and organic pollutant degradation,discovering S/N-self-doping shown to facilitate a synergistic effect on reactive oxygen species(ROS)generation.Under the optimum temperature of 800℃,the WLGC exhibited a H_(2)O_(2) selectivity of 94.2%and tetracycline removal of 99.3%within 60 min.Density functional theory calculations and in-situ Fourier transformed infrared spectroscopy verified that graphitic N was the critical site for H_(2)O_(2) generation.While pyridinic N and thiophene S were the main active sites responsible for OH generation,N vacancies were the active sites to produce ^(1)O_(2) from O_(2).The performance of the novel cathode for tetracycline degradation remains well under a wide pH range(3–11),maintaining excellent stability in 10 cycles.It is also industrially applicable,achieving satisfactory performance treating in real water matrices.This system facilitates both radical and non-radical degradation,offering valuable advances in the preparation of cost-effective and sustainable electrocatalysts and hold strong potentials in metal-free EAOPs for organic pollutant degradation.

关 键 词：BIOCHAR S and N self-doping H_(2)O_(2)production In-situ FTIR Metal-free electrochemical advanced oxidation processes 

分 类 号：O643.36[理学—物理化学] X505[理学—化学]