SDBS辅助合成Y2O3/Ag3VO4光催化剂及其催化可见光降解罗丹明B

SDBS-assisted Synthesis of Y_2O_3/Ag_3VO_4 Photocatalyst and Its Photocatalytic Activity for Degradation of Rhodamine B under Visible Light Irradiation

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%.

Ag3VO4 and Y2O3/Ag3VO4 photocatalysts were synthesized by precipitation and impregnation with the assistant of sodium dodecylbenzene sulfonate（SDBS）, and V2O5, AgNO3 and Y（NO3）3·6H2O as raw materials, their structure and morphology characterized, and the synthesis mechanism was analyzed. The results showed that the absorption edge of Y2O3/Ag3VO4 was red-shifting, and the energy gap was 1.83 e V with SDBS assistance. The synthesized Y2O3/Ag3VO4 showed excellent photocatalytic activity and stability for degradation of rhodamine B（Rh B） because of the adsorption enrichment of benzene and effective separation of photogenerated electron-hole pair. The degradation rate of 8 mg/L Rh B in 200 m L solution was 94.2% by 0.08 g 3%Y2O3/Ag3VO4 in 15 min illumination.