不同水解抑制剂下Sr2+掺杂改性纳米TiO2的制备及可见光响应行为

采用溶胶-凝胶法，以钛酸丁酯为钛源，分别以三乙醇胺和亚氨基二乙酸为水解抑制剂，制备掺杂不同含量Sr²⁺的纳米TiO₂，并对其在可见光范围内对孔雀石绿的光催化降解活性进行评价。结果表明，Sr²⁺掺杂能够有效提高纳米TiO₂的光催化性能，并确定不同条件下合成的纳米TiO₂的最佳掺杂量和反应条件。对掺杂的TiO₂进行紫外可见漫反射光谱、X射线衍射、傅里叶变换红外光谱以及氮物理等温吸附等表征，揭示了表面性能、电子结构、脱水性能、吸附性能、结晶程度和晶相结构等多方面协同作用是Sr²⁺掺杂的TiO₂具有最高光催化活性的原因。这种新型光催化剂可能在环境净化和水处理方面具有一定的应用价值。

Preparation of Sr2+-doped TiO2 nanoparticles in different hydrolysis inhibitors and their visible light response performance

Using butyl titanate ［Ti(OBu)₄］ as titanium source and triethanolamine ［N(OC₂H₅)₃］ or iminodiacetic acid as the hydrolysis inhibitors,nano TiO₂ with different Sr²⁺ doping amounts were prepared by sol-gel method.The photocatalytic activity of Sr²⁺-doped TiO₂ for photocatalytic degradation of malachite green under visible light was investigated.The results showed that the photocatalytic activity of nano TiO₂ was enhanced by doping strontium,and the optimal doping amount of strontium and reaction condition of the catalysts prepared under defferent conditions were determined.The as-prepared photocatalysts were characterized by FT-IR,XRD,BET and UV-Vis-DRS.The characterization results indicated that the synergetic effect of surface property,electronic structures,dehydration properties,absorption properties,the degree of crystallinity and crystalline structures was the reason that Sr²⁺-doped TiO₂ calcined at 550 ℃ possessed the highest photocatalytic activity.The new photocatalysts could had certain application value in depollution of environment and water treatment.