利用介质极性调节制备纯二氧化钛可见光催化剂

Preparation of Titania Visible Photocatalysts by Polar Modulation of Solvent

利用介质极性调节与表面活性剂(十二烷基磺酸钠,SDS)辅助Ti Cl4水解,成功地制备了纯二氧化钛光催化剂(TPC)。所制备的样品均具有可见光催化降解甲基橙的活性,而且随着Ti Cl4与SDS摩尔比及Ti Cl4与正辛烷摩尔比增大、甲基橙的初始浓度降低,催化降解效率提高。介质极性调节与表面活性剂(十二烷基磺酸钠,SDS)协同作用,可调控粒子间的相互作用强度以及高能氧桥键的分布,从而调控可见光催化活性;TPC光催化降解甲基橙的反应具有假一级反应的动力学特征。使用Ti Cl4与SDS摩尔比为51.2、Ti Cl4与正辛烷摩尔比为3.5的TPC_4,在可见光(35 W普通民用光源)下照射3 h,甲基橙降解率高达69.6%。

Titania photocatalysts（ TPC） were successfully prepared by polar modulation of solvent and SDS-assisted hydrolysis of Ti Cl4. The results show that all of the as-prepared samples have good visible light photocatalytic activities for the photodegradation of methyl orange. It possesses a high efficiency for photodegradation of methyl orange as the mole ratio of Ti Cl4 to SDS and Ti Cl4 to n-octane is high,or the initial concentration of methyl orange is low. The synergistic effect of polar modulation of solvent and SDS is helpful to regulate the intensity of interaction between particles,and the distribution of high-energy oxo-bridging,so as to control visible light photocatalytic activties. The degradation of metyl orange by TPC fits the pseudo-first-order kinetics. The removal efficiency of methyl orange by TPC_4（ the mole ratio of Ti Cl4 to SDS is 51. 2,and mole ratio of Ti Cl4 to n-octane is 3. 5） is up to 69. 6% under visible light（ 35 W,common civilian illuminant） irradiation for 3 h. It would possess extensive application prospect in self-cleaning interior building latex coating with photocatalysis.