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研究报告

Synthesis of transparent Cl-TiO₂ aqueous dispersion and its performance on toluene degradation and sterilization under visible light

胡芸
华南理工大学环境与能源学院，广州 510006;广东省大气环境与污染控制重点实验室，广州 510006;广东省环境风险防控与应急处置工程技术研究中心，广州 510006

摘要：开发具有高稳定性和高可见光活性的光催化剂透明分散液对光催化材料的实际应用至关重要.本文采用非水解溶胶凝胶法制备了透明Cl掺杂TiO₂分散液（Cl-TiO₂）.该分散液经过60 d仍能保持稳定，没有颗粒沉降.与商用P25、PEG400-TiO₂相比，Cl-TiO₂具有最优的可见光降解甲苯的光催化活性，并且具有良好的循环稳定性.Cl-TiO₂在可见光下同时具有优异的灭菌效果，对大肠杆菌的灭菌率达到98.75%.其优异的可见光响应性归因于Cl掺杂增强了对可见光的吸收，提高了电子空穴的分离效率.Cl-TiO₂水分散液良好的稳定性得益于表面带有的电荷以及较小的水合粒径.这项工作为光催化剂用于改善室内环境提供了新策略.

Abstract：The development of transparent photocatalyst dispersion with high stability and high visible light activity is very important for the application of photocatalyst. Transparent Cl doped TiO₂ dispersions （Cl-TiO₂） were prepared by a non-hydrolytic sol-gel method. The dispersion remained stable during 60 days without sedimentation. Cl-TiO₂ showed higher visible light photocatalytic activity for toluene degradation compared with commercial P25 and PEG400-TiO_2. Cl-TiO₂ was also found to be effective against Escherichia coli （antibacterial activity 98.75%） under visible light. Its excellent visible light activity was attributed to the Cl doping， which enhanced the absorption of visible light and improved the separation efficiency of electron-hole pairs. The high stability of Cl-TiO₂ aqueous dispersion was due to the charge on the surface and the small hydrated particle size. This work provided a new strategy for photocatalyst to improve indoor environment.