BiOI/BiOBr_(0.9)I_(0.1)光催化剂的制备及其对2,4-二氯苯氧乙酸的降解性能  

Preparation of BiOI/BiOBr_(0.9)I_(0.1)photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid

作　　者：余关龙[1,2] 王世涛 杨凯 孙琪芳[1] 阳艺 YU Guanlong;WANG Shitao;YANG Kai;SUN Qifang;YANG Yi(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province,Changsha 410114,China)

机构地区：[1]长沙理工大学水利与环境工程学院,长沙410114 [2]洞庭湖水环境治理与生态修复湖南重点实验室,长沙410114

出　　处：《复合材料学报》2023年第1期201-211,共11页Acta Materiae Compositae Sinica

基　　金：长沙理工大学专业学位研究生“实践创新与创业能力提升计划”项目(SJCX202038);湖南省自然科学基金(2021JJ30728);湖南省生态环境厅科研项目(HBKT-2021012);湖南省教育厅重点项目(19A032)。

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_(0.9)I_(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_(0.9)I_(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/BiOBr_(0.9)I_(0.1)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/BiOBr_(0.9)I_(0.1)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·O_(2)^(−)和h^(+)是主要的活性物种。制备的BiOBr_(0.9)I_(0.1)能有效调节BiOBr能带结构。BiOBr_(0.9)I_(0.1)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。The pollution of pesticides seriously threatens the ecological environment and drinking water safety.A novel and efficient photocatalyst of BiOI/BiOBr_(0.9)I_(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_(0.9)I_(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_(0.9)I_(0.1) and improves the redox ability of photogenerated carriers.The results of photocatalytic experiments show that 15wt%BiOI/BiOBr_(0.9)I_(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·O_(2)^(−)and h^(+)are the main active species.The BiOBr_(0.9)I_(0.1) synthesized can effectively modulate the energy band structure of BiOBr.The heterojunction composed of BiOBr_(0.9)I_(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.

关 键 词：BiOBr 固溶体 异质结 农药 光催化 2 4-二氯苯氧乙酸 BiOBr_(0.9)I_(0.1) 

分 类 号：TB331[一般工业技术—材料科学与工程]