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.
作者
余关龙
王世涛
杨凯
孙琪芳
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)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
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)。
作者简介
通信作者:余关龙,博士,副教授,硕士生导师,研究方向为光催化材料及污水处理,E-mail:ygl079@csust.edu.cn。
