AgBr/Ag3PO4的制备及光催化性能研究

摘要

AgBr/Ag3PO4 photocatalyst has been prepared by in-situ ion exchange method,using Ag3PO4 as precursor. Its photocatalytic degradation capacity under visible light is studied,using methyl orange(MO) as model pollutants. The influences of material ratio,initial MO mass concentration and catalyst dosage on photocatalytic capacity are investigated. The recyclability and degradation mechanism of the materials are also studied. The results show that the composite catalyst has better MO degradation capacity than Ag3PO4. When the material ratio is 1∶1,the catalyst obtained has the best capacity. When the initial MO is 5 mg/L,catalyst dosage is 2 g/L and illumination time is 30 min, the degradation rate of MO can reach 96%or more. This catalyst can be used repeatedly. The main active species in the photo-degradation reaction are h+and·OH free radicals.%以Ag3PO4为前体，采用原位离子交换法制备了AgBr/Ag3PO4光催化剂，以甲基橙为模型污染物，研究了其可见光催化降解性能。考察了物料配比、甲基橙初始质量浓度和催化剂用量对光降解的影响，以及材料的循环使用性及降解机理。结果表明：复合催化剂对甲基橙的降解性能优于Ag3PO4，物料比为1∶1时所得催化剂的性能最好。在甲基橙为5 mg/L、催化剂用量为2 g/L时，光照30 min降解率可达96%以上。该复合催化剂可重复使用。空穴和羟基自由基是该光降解反应中的主要活性物种。