利用生物模板法制备TiO₂，将（NH₄）₃PW₁₁O₃₉Sn负载于TiO₂上，制备具有多孔结构的（NH₄）₃PW₁₁O₃₉Sn/TiO₂复合材料。采用XRD、DRS、SEM、TEM和XPS等手段表征了（NH₄）₃PW₁₁O₃₉Sn/TiO₂的微观形貌和结构。采用Tauc Plot法计算（NH₄）₃PW₁₁O₃₉Sn/TiO₂的禁带宽度为2.45 eV，吸收波长达到506 nm。通过可见光催化性能实验考察了（NH₄）₃PW₁₁O₃₉Sn和TiO₂的质量添加比对AR3R降解效果的影响。结果表明，当（NH₄）₃PW₁₁O₃₉Sn和TiO₂的质量比为1：1时对AR3R的降解效果较好，可见光下反应30 min，降解率可达100%左右。自由基捕获实验结果表明，降解过程中h⁺和·OH起主要的氧化作用，·O^-₂起辅助作用。

(NH₄)₃PW₁₁O₃₉Sn is loaded on TiO₂ that is prepared through bio-template method,and the product (NH₄)₃PW₁₁O₃₉Sn/TiO₂ composite with porous structure is obtained.The microstructure and morphology of the composite are characterized by XRD,DRS,SEM,TEM and XPS.Calculated by means of Tauc Plot method,the energy gap and absorption wavelength of (NH₄)₃PW₁₁O₃₉Sn/TiO₂ are 2.45 eV and 506 nm,respectively.The effects of the dosage ratio of (NH₄)₃PW₁₁O₃₉Sn/TiO₂,initial pH and the solution concentration on the photocatalytic degradation of AR3R are investigated by the visible light photocatalytic performance experiments.The results show that the degradation efficiency of AR3R reaches the best over the composite that the mass ratio of (NH₄)₃PW₁₁O₃₉Sn and TiO₂ is 1:1.The degradation rate of AR3R can reach around 100% after reacting for 30 min under visible light.It is demonstrated by free radical capture experiments that h⁺ and·OH are the key active radicals while·O₂^- plays a supplementary role during the photocatalytic degradation process.

岳琳(1980-),女,博士,副教授,主要从事水污染控制工程方向的研究,yuelintj@126.com