纳米TiO_2多孔微粒阳光催化降解活性艳蓝染料

Investigation on Solar Degradation of Reactive Brilliant Blue Dye KN-R Using Porous Nanocrystalline Titania Particles as Photocatalyst

首次利用高分子悬浮聚合与溶胶-凝胶法相结合的技术,成功地制备不同孔结构的TiO2多孔微粒,并对其光催化降解活性艳蓝KN-R的染料溶液pH、无机阴离子、光强、通空气等影响因素进行了系统研究。结果表明:强酸性条件有利于染料在催化剂表面的吸附,而强碱性条件有利于催化反应的进行;常见无机阴离子Cl-、SO42-,对染料降解有不同程度的抑制作用;染料降解效率随光强增加而提高;光降解动力学结果表明:TiO2多孔微粒对活性艳蓝KN-R染料的光催化降解反应符合一级反应动力学;降解时持续通空气有利于降解效率的提高。实验证明所制得的微粒具有良好的光催化降解效果和重复使用性能。

The porous nanocrystalline titania particles were prepared by combination of suspension polymerization and sol-gel method. The various factors, such as the pH of dye solution, inorganic anion, light intensity, aeration which have effects on the degradation of dye, were investigated systemically. The results showed that strong acidity was propitious for dye to the adsorption on the surface of the catalyst, while the strong alkalescence was propitious to catalyzed reaction; The familiar inorganic anion, such as Cl- and SO42-, showed different restriction on the degradation of dye; The efficiency of the degradation increased with the increase of light intensity; The result of kinetics of photo-degradation showed that the photo-degradation was first order kinetic reaction. The continual aeration was in favor of the increase of degradation efficiency. It was proved that the prepared TiO2 particles have excellent degradation effect and can be used repeatedly. 