纳米光催化剂Sm2InNbO7的制备及其可见光产氢活性

采用溶胶-凝胶法制备了纳米光催化剂Sm2InNbO7,通过XRD、FE-SEM、BET以及UV-Vis DRS测试对该材料的结构、粒径、比表面积和光吸收性能进行了表征。结果表明,Sm2InNbO7的晶粒尺寸和比表面积与柠檬酸(CA)加入量和煅烧温度有关。着重考察了不同条件下制备的Sm2InNbO7系列催化剂的光催化分解水产氢活性。实验结果表明,当CA与金属阳离子(Nb5++Sm3++In3+)的物质的量的比为2、煅烧温度为1073K时,获得的Sm2InNbO7纳米粉体具有最高的光催化产氢活性,测得的8h内平均产氢速率为8.32μmol/h,为固相法制备的Sm2InNbO7粉体的产氢速率的2.2倍。

Preparation of nanosized photocatalyst Sm2 InNbO7 and its photocatalytic hydrogen evolution activity under visible light irradiation

Nanosized photocatalyst Sm2InNbO7 were synthesized by sol-gel method and characterized on crystal structure,crystallite size,surface area and optical absorption by XRD,FE-SEM,BET and UV-Vis DRS.The results showed that the amount of citric acid(CA)and calcination temperature had great effect on their particle size and surface area.The photocatalytic activities of samples for hydrogen evolution were compared with different preparation conditions.The results indicated that photocatalytic activities of Sm2InNbO7,which was prepared when the molar rate of CA/(Nb5++Sm3++In3+)was 2 and calcination temperature was 1073K,was the highest with an average hydrogen evolution rate of 8.32μmol/h in 8 hours,which was 2.2 times that of Sm2InNbO7 synthesized by solid-state reaction method.