PMo/BWO光催化降解水中亚甲基蓝的性能和机理  

Performance and mechanism of photocatalytic methylene blue degradation by PMo/BWO

作　　者：李静 李帅 李征 李杨松 胡乐 LI Jing;LI Shuai;LI Zheng;LI Yangsong;HU Le(School of Civil and Transportation,Hebei University of Technology,Tianjin 300401,China;First Design&Research Institute,North China Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300074,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国市政工程华北设计研究总院有限公司第一设计研究院,天津300074

出　　处：《应用化工》2025年第1期186-192,共7页Applied Chemical Industry

基　　金：河北省自然基金(B2022202077);河北工业大学本科教育教学改革研究与实践项目(202202013)。

摘　　要：通过沉淀和浸渍法制备出PMo/BWO_(9)异质结复合光催化剂,进行光催化降解亚甲蓝(MB)研究。结果表明,400℃煅烧的PMo/BWO_(9)具有优异光催化性能,可在90 min可见光照射下降解99.5%的MB。PMo/BWO_(9)的反应速率常数是BWO的4.18倍,且经过5次循环使用后,PMo/BWO_(9)对MB的降解效率仍在80%以上。能带分析表明,PMo和BWO之间形成Z型异质结,降低光生电子-空穴复合率,提升光催化效率。通过自由基猝灭实验和电子顺磁共振(EPR)测试发现,在光催化体系中空穴和超氧自由基(·O^(-)_(2))是MB降解的主要活性物种。PMo/BWO_(9)Composite photocatalyst were synthesized by precipitation and impregnation method for the degradation of methylene blue(MB)under visible light.The results showed that PMo/BWO_(9)calcined under 400℃exhibited excellent photocatalytic performance.In comparsion with BWO,the particle size of the PMo/BWO_(9)catalyst changed insignificantly.Moreover,the PMo/BWO_(9)exhibited a MB degradation efficiency of 99.5%within 90 min,and with a reaction rate constant 4.18 times that of the BWO.Notably,the degradation rate of MB by PMo/BWO_(9)is still greater than 80%after 5 cycles of use,indicating the PMo/BWO_(9)possessed stable and good photocatalytic performance.Band analysis explored the charge transfer pathways between the heterojunction components,indicating that the heterojunction type of the PMo/BWO_(9)was Z-scheme,which reduced electron hole recombination rate and improved photocatalytic efficiency.From the quenching experiments and electron paramagnetic resonance(EPR)tests,it was found that holes and superoxide radicals(·O^(-)_(2))are the main active species for MB degradation in the photocatalytic system.

关 键 词：钨酸铋(Bi_(2)WO_(6)) 杂多酸 光催化性能 

分 类 号：TQ426.64[化学工程] TQ032TQ085