过硫酸盐增强花状MnCo_(2)O_(4)可见光降解性能

Enhanced Photodegradation Performance of Flower-like MnCo_2O_(4)with Persulfate Under Visible Light

为了充分利用光降解技术与过硫酸盐氧化技术耦合的优势,成功制备了具有3D中空结构的花状MnCo_(2)O_(4)催化剂(HF-MnCo_(2)O_(4))。在可见光照射下,HF-MnCo_(2)O_(4)能够有效地活化过硫酸钾(PS)。将PS引入光催化体系(HF-MnCo_(2)O_(4)/PS/Vis),可以降低光生e^(-)/h^(+)对的复合机率,同时也增加该体系的活性物种数量。以亚甲基蓝(MB)为目标物,考察了HF-MnCo_(2)O_(4)/PS/Vis耦合体系的光催化性能。得益于MnCo_(2)O_(4)独特的分级结构及MnCo_(2)O_(4)和PS之间协同效应,HF-MnCo_(2)O_(4)/PS/Vis耦合体系对MB展现出较好的降解去除能力,可见光照射50 min对MB的去除率达到96.8%。根据自由基捕获实验和能带分析,系统地探讨了HF-MnCo_(2)O_(4)/PS/Vis耦合体系光降解性能增强的机制。

The 3D hierarchical hollow flower-like MnCo_2O_4(HF-MnCo_2O_4)is prepared successfully to combine the advantages of the photocatalytic degradation and persulfate(PS)oxidation.The obtained HF-MnCo_2O_(4)could effectively activate PS under visible irradiation.The photocatalytic activities for the coupled system containing of HF-MnCo_2O_(4)and PS are investigated by the photodegradation of methylene blue(MB)under visible light irradiation.The introduction of PS not only inhibits the recombination of photoexcited e~-/h~+pairs,but also generates more actived species in the system.Benefiting from the unique construction and the synergistic effect between of HF-MnCo_2O_(4)and PS,the removal ratio of HF-MnCo_2O_4/PS/Vis system for MB reaches to 95.8%.The enhanced mechanism for mineralization contaminant of HF-MnCo_2O_4/PS/Vis system is discussed in details.