g-C_(3)N_(4)/Pd/Bi_(2)WO_(6)光催化剂协同降解苯扎贝特机理研究  

Study on g-C_(3)N_(4)/Pd/Bi_(2)WO_(6) heterostructure and its synergistic degradation mechanism of bezafibrate

作　　者：尹泽 高博熠 刘愿强 高爱舫 YIN Ze;GAO Bo-yi;LIU Yuan-qiang;GAO Ai-fang(Hebei GEO University,Shijiazhuang 050031,China;Hebei Province Key Laboratory of Sustained Utilization and Development of Water Resources,Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources,Hebei Center for Ecological and Environmental Geology Research and Optimization of Industrial Structure,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学水资源与环境学院,河北石家庄050031 [2]河北省水资源可持续利用与开发实验室,河北省高校生态环境地质应用技术研发中心,河北省水资源可持续利用与产业结构优化协同创新中心,河北石家庄050031

出　　处：《中国环境科学》2024年第5期2504-2513,共10页China Environmental Science

基　　金：河北省教育厅科学研究项目(BJK2024008);河北省高校基本科研业务费资助项目(QN202120,QN202122);河北地质大学教学改革研究与实践项目(2023J28)。

摘　　要：利用贵金属Pd的等离子体共振效应和形貌可控Bi2WO6的光催化协同作用,通过低温水热法设计合成具有高效可见光活性的花状g-C_(3)N_(4)/Pd/Bi_(2)WO_(6)异质结复合催化剂.在可见光照射下,异质结复合催化剂光催化降解BZF的去除率均高于g-C_(3)N_(4),g-C_(3)N_(4)/Bi_(2)WO_(6),Pd/g-C_(3)N_(4)和Bi_(2)WO_(6),其中,50%g-C_(3)N_(4)/Pd/Bi_(2)WO_(6)对BZF的去除率为96%,是Pd/g-C_(3)N_(4)的1.8倍,g-C_(3)N_(4)和Bi_(2)WO_(6)的2.7倍.基于表征分析可知,g-C_(3)N_(4)/Pd/Bi_(2)WO_(6)复合催化剂中Bi_(2)WO_(6)呈现中心辐射花状纳米结构,并与层状Pd/g-C_(3)N_(4)连接;贵金属Pd可作为电子传输的介质,促进g-C_(3)N_(4)和Bi_(2)WO_(6)Z型异质结构的形成,有利于协同提升可见光催化活性.淬灭实验和EPR表征证实了·OH是g-C_(3)N_(4)/Pd/Bi_(2)WO_(6)催化降解BZF的主要活性物质,LC-MS/MS分结果表明羟基化作用取代贝特链是BZF降解的主要路径.A flower-like g-C_(3)N_(4)/Pd/Bi_(2)WO_(6) heterostructure with high visible light activity was designed and synthesized by low temperature hydrothermal method utilizing the plasmon resonance effect of noble metal Pd and the photocatalytic synergism of shape-controlled Bi_(2)WO_(6).It was found that the composite of Pd/g-C_(3)N_(4) and Bi_(2)WO_(6) significantly enhanced removal efficiency of BZF under visible light irradiation.Further analysis of characterization showed that Bi_(2)WO_(6) in g-C_(3)N_(4)/Pd/Bi_(2)WO_(6) exhibited a central radiated flower-like nanostructure,which is connected with layered Pd/g-C_(3)N_(4).The noble metal Pd could be used as the medium for electron transport to promote the formation of Z-type heterostructures between g-C_(3)N_(4) and Bi_(2)WO_(6),which is beneficial to cooperatively enhance the photocatalytic activity.It was confirmed that·OH was the main active species in degradation of BZF with g-C_(3)N_(4)/Pd/Bi_(2)WO_(6) heterostructures by quenching experiments and EPR analysis.Moreover,the LC-MS/MS analysis indicated that hydroxylation with fibrate chain substituent was the main route of BZF degradation.

关 键 词：苯扎贝特 PD g-C_(3)N_(4) Bi_(2)WO_(6) 异质结 

分 类 号：X703.5[环境科学与工程—环境工程]