(1. 长沙理工大学 化学与生物工程学院，长沙 410114；
2. 中南大学 化学化工学院，长沙 410083)
摘 要: 以钛酸丁酯为原料，用低温超声水解方法合成不同掺杂W浓度的金红石型TiO2光催化剂，采用XRD、PL、DRS和BET等技术进行催化剂性能的表征。在光源为高压汞灯和氙灯、Fe3+为电子受体、悬浮液pH值为2.0的条件下，考察W掺杂对金红石型TiO2的光催化分解水析氧活性的影响。结果表明：当W掺杂量为1.0%~4.0%(摩尔分数)时，W掺杂没有引起金红石型TiO2晶型的改变，表面形成氧空位，在导带底附近形成施主能级，有利于光生电子和空穴的分离，掺杂催化剂光致发光强度与其光催化析氧活性的变化趋势一致；当W掺杂量为2.0%时，掺杂催化剂的光催化分解水析氧活性最高，在紫外光和可见光下光催化分解水的析氧速率分别为148.8 μmol/(L∙h)和102.9 μmol/(L∙h)，分别比金红石型TiO2掺杂改性前的析氧速率提高了30.6%和65.7%.
关键字: 金红石型TiO2；钛酸丁酯；超声水解；掺杂钨；光催化分解水；析氧
（1. College of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:W doped rutile TiO2 powders with different W doping concentrations were prepared by low temperature ultrasonic hydrolysis using tetrabutyl titanate(C16H36O4Ti) as raw material. The powders were characterized by XRD, PL, DRS and BET. Using Fe3+ as electron acceptor, under condition of pH=2.0, UV irradiation and visible radiation, the effect of W doping concentration on the photocatalytic oxidation activity of rutile TiO2 particles was investigated. The results show that when W doping concentration is 1.0%−4.0%, W doping does not cause any change in rutile TiO2 crystal structure. Therefore, surface oxygen vacancies and the donor energy level near the bottom of the conduction band lead to easier departure of photoinduced electrons from holes to achieve stronger photocatalytic activity. The highest photocatalytic oxygen evolution and PL spectra intensity are achieved when the concentration of W is 2.0% , the O2 evolution speeds are 148.8 μmol/(L∙h) and 102.9 μmol/(L∙h) under UV irradiation and visible radiation, which are 30.6% and 65.7% higher than those before being doped.
Key words: rutile TiO2; tetrabutyl titanate; ultrasonic hydrolysis; W doping; photocatalytic water splitting; O2 evolution
