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-C3N4/Pd/Bi2WO6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-C3N4,g-C3N4/Bi2WO6,Pd/g-C3N4和Bi2WO6,其中,50％g-C3N4/Pd/Bi2WO6对 BZF 的去除率为 96％,是 Pd/g-C3N4 的 1.8 倍,g-C3N4和 Bi2WO6 的 2.7 倍.基于表征分析可知,g-C3N4/Pd/Bi2WO6复合催化剂中Bi2WO6呈现中心辐射花状纳米结构,并与层状Pd/g-C3N4连接;贵金属Pd可作为电子传输的介质,促进g-C3N4和Bi2WO6Z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-C3N4/Pd/Bi2WO6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.
Abstract
A flower-like g-C3N4/Pd/Bi2WO6 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 Bi2WO6.It was found that the composite of Pd/g-C3N4 and Bi2WO6 significantly enhanced removal efficiency of BZF under visible light irradiation.Further analysis of characterization showed that Bi2WO6 in g-C3N4/Pd/Bi2WO6 exhibited a central radiated flower-like nanostructure,which is connected with layered Pd/g-C3N4.The noble metal Pd could be used as the medium for electron transport to promote the formation of Z-type heterostructures between g-C3N4 and Bi2WO6,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-C3N4/Pd/Bi2WO6 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.
基金项目
河北省教育厅科研项目(BJK2024008)
河北省高等学校基本科研业务费资助项目(QN202120)
河北省高等学校基本科研业务费资助项目(QN202122)
河北地质大学教学改革研究与实践项目(2023J28)
万方数据