【摘要】 农药污染严重危害生态环境和饮用水安全。采用溶剂热法制备一种新型高效的BiOI/BiOBr_0.9I_0.1光催化剂。通过XRD、SEM、XPS、UV-vis DRS、PL、EIS等手段表征其结构、形貌和光学性能等理化性质。制备的BiOI/BiOBr_0.9I_0.1呈团簇状堆积结构，有助于活性位点的增加，固溶体和异质结两种策略的结合拓宽了BiOBr的光响应范围，有效防止光生电子-空穴对在BiOI/BiOBr0.9I0.1内部复合并提高产生光生载流子的氧化还原能力。光催化实验结果表明，合成的15wt%BiOI/BiOBr0.9I0.1在可见光下对2,4-二氯苯氧乙酸（2,4-D）有最佳的光催化性能，120 min降解2,4-D效率最高可达95%,4次循环实验后降解率仍达到80.9%。结合捕获实验与电子自旋共振（ESR）技术结果可以证实?O2-和h+是主要的活性物种。制备的BiOBr0.₉I0.1能有效调节BiOBr能带结构。BiOBr0.9I0.1和BiOI构成的异质结符合Z型异质结特点，构建异质结和固溶体两方法之间可在增强BiOBr光催化活性上产生协同作用。更多还原

【Abstract】 The pollution of pesticides seriously threatens the ecological environment and drinking water safety.A novel and efficient photocatalyst of BiOI/BiOBr_0.9I_0.1 was prepared through solvothermal method.The physicochemical properties,such as structure,morphology and optical properties,were characterized by detections of XRD,SEM,XPS,UV-vis DRS,PL,EIS,etc.The BiOI/BiOBr_0.9I_0.1 synthesized has a cluster-like accumulation structure,which facilitates the increase of active sites.The combination of solid solution and heterojunction broadens the photoresponse range of BiOBr,effectively prevents the recombination of photogenerated electron-hole pairs inside BiOI/BiOBr_0.9I_0.1 and improves the redox ability of photogenerated carriers.The results of photocatalytic experiments show that 15wt%BiOI/BiOBr_0.9I_0.1 reaches the best photocatalytic performance for 2,4-dichlorophenoxyacetic acid （2,4-D） under visible light,and the degradation efficiency of 2,4-D can reach 95%within 120 min.Furthermore,the degradation rate still reaches 80.9%after four cycles of experiments.According to the results of capture experiments and electron spin-resonance （ESR） tests,it can be confirmed that?O2-and h+are the main active species.The BiOBr_0.9I_0.1synthesized can effectively modulate the energy band structure of BiOBr.The heterojunction composed of BiOBr_0.9I_0.1 and BiOI is consistent with the characteristics of Z-scheme heterojunction,and the synergistic effect between the two strategies of constructing heterojunction and solid solution can be produced in enhancing the photocatalytic activity of BiOBr.更多还原