Enhanced electrochemical oxidation of benzene and toluene in aqueous environments using Sb–SnO_(2)-doped TiO_(2) nanotubes modified by hydrophobic polytetrafluoroethylene(PTFE)  

作　　者：Yameng Li Shuo Zhang Peizhen Yang Yilin Yang Fei Chen Xiang Liu Miao Li 

机构地区：[1]School of Environment,Tsinghua University,Beijing,100084,China [2]Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University,300387,Tianjin,China

出　　处：《Progress in Natural Science:Materials International》2024年第5期1009-1020,共12页自然科学进展·国际材料(英文版)

基　　金：the Beijing Municipal Science and Technology Commission (Z181100005318002) for providing financial support for this research

摘　　要：The presence of benzene and toluene in groundwater poses a serious threat to both aquatic ecosystems and human health. The electrochemical removal of these contaminants is primarily hindered by the low generation yield of reactive oxygen species(ROS). Herein, polytetrafluoroethylene(PTFE) was electrodeposited onto the surface of Sb–SnO_(2)-doped TiO_(2)nanotubes(TNT/Sb–SnO_(2)/5PTFE-300) to enhance electrochemical activity. The resulting nanoelectrode achieved removal efficiencies of 96.2 % for benzene and 97.6 % for toluene. The minimal variation in the degradation of benzene and toluene following 8 cycles of use verified its stability. Experiments confirmed that ·OH was the primary ROS. Hydrophobic surface of the nanoelectrode promoted the one-electron reaction of H2O oxidation, leading to ·OH concentrations that were 54.0 and 27.5 times higher, respectively, than those produced by Ti/Sb–SnO_(2), and 4.7 and 2.0 times higher, respectively, than those produced by TNT/Sb–SnO_(2)-300.Moreover, intermediate products suggested the ring-opening of benzene and toluene, yielding easily degradable small organic molecules. The electrochemical oxidation(EO) process revealed a competitive relationship between benzene and toluene, with toluene exhibiting stronger competitive effects(kinetic constant was 2.1 times that of benzene). The efficient nanoelectrode provide a novel approach for the removal of benzene and toluene from aquatic environments through EO.

关 键 词：Electrochemical oxidation Benzene and toluene removal Competitive oxidation Aquatic environment remediation HYDROPHOBICITY 

分 类 号：TB383.1[一般工业技术—材料科学与工程] X52[环境科学与工程—环境工程]