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以V_2O_5,AgNO_3和Y(NO_3)_3×6H_2O为原料、十二烷基苯磺酸钠为辅助剂,采用直接沉淀法和浸渍法制备单斜晶相Ag_3VO_4和Y_2O3_/Ag_3VO_4复合催化剂,表征了产物的结构和形貌,并分析了其形成机理;在可见光下研究了其催化可见光降解罗丹明B(Rh B)的性能.结果表明,所得Y_2O_3/Ag_3VO_4复合催化剂吸收边相对纯相Ag_3VO_4发生红移,禁带宽度减小至1.83 e V,电子-空穴对复合几率降低,对Rh B有较好的可见光催化活性和稳定性,可见光照射15 min后,0.08 g 3%Y2O_3/Ag_3VO_4催化200 m L 8 mg/L Rh B溶液的降解率达94.2%.
The composite catalysts of monoclinic Ag_3VO_4 and Y_2O_3_ / Ag_3VO_4 were prepared by direct precipitation and impregnation with V2O5, AgNO_3 and Y (NO_3) _3 × 6H_2O as raw materials and sodium dodecyl benzene sulfonate as auxiliary agent. And its formation mechanism was analyzed.The photocatalytic degradation of rhodamine B (Rh B) under visible light was studied.The results show that the absorption edge of the obtained Y_2O_3 / Ag_3VO_4 composite catalyst is red shifted relative to pure phase Ag_3VO_4 , The band gap decreases to 1.83eV, the recombination probability of electron-hole pair decreases, and the visible light photocatalytic activity and stability of Rh B are better. After 15 min of visible light irradiation, 0.08 g 3% Y2O3 / Ag3VO4 catalyzes 200 m The degradation rate of L 8 mg / L Rh B solution was 94.2%.