• 关键词：H₃PW₁₂O₄₀/TiO₂  可见光光催化  孔雀石绿  降解

• 基金项目：教育部归国留学人员科研启动基金;江苏大学人才基金(No.06JDG030)

• 黄卫红
• 江苏大学环境学院, 镇江 212013

• 刘瑞
• 江苏大学环境学院, 镇江 212013

• 王晶博
• 江苏大学环境学院, 镇江 212013

• 杨丹
• 江苏大学环境学院, 镇江 212013

• 阮介兵
• 江苏大学环境学院, 镇江 212013

• 摘要：以钛酸四丁酯为原料,采用溶胶-凝胶法制备TiO₂光催化剂,然后浸渍法制备出H₃PW₁₂O₄₀/TiO₂复合型光催化剂,并运用XRD、SEM、FT-IR和DRS对催化剂进行表征和分析.研究了可见光光照下H₃PW₁₂O₄₀/TiO₂对孔雀石绿降解的光催化活性,考察了浸渍量、催化剂用量、底物浓度、pH值对光催化降解率的影响.实验表明,在pH=5条件下,H₃PW₁₂O₄₀/TiO₂催化剂用量为0.3g·L^-1,浓度为10mg·mL^-1的孔雀石绿溶液在2L·min^-1曝气、300W可见光下光照4h后光催化降解率为78%,比TiO₂光催化活性提高了24%.

• Abstract：Acomposite H₃PW₁₂O₄₀/TiO₂ photocatalyst was prepared by impregnating H₃PW₁₂O₄₀ onto nanosized TiO₂,which was prepared by a sol-gel method with tetrabutyl titanate.The composite photocatalyst was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectrometry(FT-IR)and UV-Vis diffuse reflectance spectroscopy(DRS).The photocatalytic activity of the catalyst toward decomposing malachite green(MG)was studied under visible-light irradiation.The influences of several operating parameters,such as impregnation volume,the dosage of catalyst,initial dye concentration,and pH,on the photocatalytic degradation of MGwere investigated.The degradation rate of MGwith H₃PW₁₂O₄₀/TiO₂ was 78% after being treated for 4 h under 300 Wvisible-light irradiation at pH 5,with 2 L·min^-1 aeration using 0.3 g·L^-1 H₃PW₁₂O₄₀/TiO₂ as the photocatalyst,which was higher than that when using TiO₂ photocatalyst alone.

• Key words：H₃PW₁₂O₄₀/TiO₂  visible-light photocatalysis  malachite green  degradation

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