C空位协同g-C_(3)N_(4)/BiOCl异质结对亚甲基蓝光催化降解性能的研究  

Photocatalytic degradation of methylene blue by C-vacancy and g-C_(3)N_(4)/BiOCl heterojunction

作　　者：王雪燕 袁嘉泽 何禄英 WANG Xueyan;YUAN Jiaze;HE Luying(School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Key Laboratory of Green Chemical Process of Ministry of Education(Wuhan Institute of Technology),Wuhan 430205,China)

机构地区：[1]武汉工程大学化工与制药学院,绿色化工过程教育部重点实验室(武汉工程大学),湖北武汉430205

出　　处：《武汉工程大学学报》2024年第5期490-496,542,共8页Journal of Wuhan Institute of Technology

基　　金：武汉工程大学第十四届研究生教育创新基金(CX2022026);武汉工程大学绿色化工过程教育部重点实验室创新基金(GCX2023005);国家级大学生创新创业训练计划项目(202110490002)。

摘　　要：采用水热法合成了含C空位的g-C_(3)N_(4),并将不同含量的BiOCl负载其上制备得到g-C_(3)N_(4)/BiOCl复合光催化剂。采用电子顺磁共振、X射线光电子能谱、扫描电子显微镜、透射电子显微镜和紫外-可见漫反射光谱等手段对光催化剂的结构、形貌以及光吸收性能进行表征。以亚甲基蓝为目标降解物,探究了C空位和BiOCl对g-C_(3)N_(4)光降解性能的影响以及复合光催化剂催化降解机理。结果表明:与BiOCl和g-C_(3)N_(4)相比,制得的复合光催化剂不仅可以调控电子结构,还能有效分离光生电子和空穴,两者协同作用增强了光催化降解亚甲基蓝的效率。当负载质量分数70%BiOCl时,g-C_(3)N_(4)/BiOCl光催化降解效率在光反应90 min时达到了88.6%,其光催化性能显著优于纯相g-C_(3)N_(4)与BiOCl。C-vacancy-containing g-C_(3)N_(4)was synthesized using a hydrothermal method,and composite photocatalysts of g-C_(3)N_(4)/BiOCl with different BiOCl loadings were prepared.The structure,morphology,and light absorption properties of the photocatalysts were characterized using electron paramagnetic resonance,X-ray photoelectron spectroscopy,scanning electron microscopy,transmission electron microscopy,and ultraviolet-visible diffuse reflectance spectroscopy.Methylene blue was used as the degradation target to investigate the impact of carbon vacancies and BiOCl on the photocatalytic degradation performance of g-C_(3)N_(4),along with the degradation mechanism of the composite photocatalyst.Results show that the synthesized composite photocatalyst,compared to BiOCl and g-C_(3)N_(4)alone,can regulate the electronic structure and effectively separate photogenerated electrons and holes.This synergistic effect enhances the efficiency of photocatalytic degradation of methylene blue.With 70%BiOCl loading,the photocatalytic degradation efficiency of g-C_(3)N_(4)/BiOCl reached 88.6%after 90 minutes of light reaction,outperforming pure-phase g-C_(3)N_(4)and BiOCl.

关 键 词：g-C_(3)N_(4) BiOCl 碳空位 异质结 光催化降解 

分 类 号：O611.3[理学—无机化学]