Ag/TiO_(2)复合物的低温合成及其光催化性能研究

Characterization and photocatalytic performance of Ag/TiO_(2) composite synthesized at low temperature

以钛酸四正丁酯、硝酸银为原料,采用溶胶凝胶与溶剂热相结合的方法,在低温(120℃)条件下制备了Ag/TiO_(2)复合物。采用SEM、EDS、XRD、XPS、DRS等对样品进行表征并对其光催化性能进行测试。结果表明:所合成的Ag/TiO_(2)(3%)复合物具有最佳的光催化效果,光催化活性最高,在100 W高压汞灯照射下光反应90 min对30 mg/L的活性Red 24染料的降解率就能达到100%;在500 W氙灯照射下150 min对30 mg/L的活性Red 24的降解率能达到92.6%;在紫外和可见光下对染料的降解率都能达到90%以上,具有优异的紫外/可见光光催化活性。研究结果为低温合成复合光催化材料的研究提供一种有效的思路。

Ag/TiO_(2) photocatalyst was prepared by sol-gel and solvothermal method with tetrabutyl titanate and silver nitrate as raw materials at low temperature(120℃).The samples were characterized by SEM,EDS,XRD,XPS and DRS,and the photocatalytic performance of Ag/TiO_(2) photocatalyst was tested.The results show that the Ag/TiO_(2)(3 wt%)photocatalyst synthesized at low temperature(120℃)has the best photocatalytic effect.Under 100 W high pressure mercury lamp irradiation,the degradation rate of 30 mg/L reactive Red 24 dye can reach 100%after 90 min photo reaction.Under the irradiation of 500 W xenon lamp for 150 min,the degradation rate of reactive Red 24 of 30 mg/L can reach 92.6%,and the degradation rate of dyes can reach more than 90%under both ultraviolet and visible light.It has excellent ultraviolet/visible light photocatalytic activity,which can provide an effective idea for the research of low temperature synthesis composite photocatalyst.