(1. 中南大學 化學化工學院，長沙 410083；
2. 長沙理工大學 化學與生物工程學院，長沙 410077)
摘 要: 以鈦酸丁酯為原料，用低溫超聲水解方法合成不同Ta摻雜濃度的金紅石型TiO2光催化劑，采用XRD、PL、DRS、BET等技術進行了催化劑表征。在光源為高壓汞燈和氙燈、Fe3+為電子受體、懸浮液pH值為2.0的條件下，考察Ta摻雜對金紅石型TiO2的光催化分解水析氧活性的影響。結果表明：Ta摻雜量(質(zhì)量分數(shù))在1.0%~5.0%范圍時，Ta摻雜沒有改變金紅石型TiO2的晶型，表面形成氧空位，在導帶底附近形成施主能級，有利于光生電子和空穴的分離，摻雜催化劑光致發(fā)光強度與其光催化析氧活性的變化趨勢一致；當Ta摻雜量在1.0%時，摻雜催化劑的光催化分解水析氧活性最高，紫外光和可見光下光催化分解水的析氧速率分別為130.4和69.6 μmol/(L∙h)，比金紅石型TiO2摻雜改性前的析氧速率分別提高14.6%和12.1%.
關鍵字: 金紅石型TiO2；摻雜鉭；光催化分解水；析氧
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. School of Chemistry and Biological Engineering, Changsha University of Science and Technology,
Changsha 410076, China）
Abstract: The photocatalyst of Ta-doped rutile TiO2 with different Ta doping concentrations were prepared by low temperature ultrasonic hydrolysis using tetrabutyl titanate(C16H36O4Ti) as raw material. This photocatalyst was characterized by XRD, PL, DRS and BET. Under the condition of Fe3+ as electron acceptor, pH=2.0 with UV irradiation and visible radiation, the effects of various Ta doping concentrations on the photocatalytic oxidation activity of Ta doped rutile TiO2 particles were investigated. The results show that with appropriate concentration ranging in 1.0%−5.0%, Ta can be doped into rutile TiO2 lattice without causing any change in rutile TiO2 crystal structure. Therefore, the 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 Ta is 1.0%, the O2 evolution speeds are 130.4 and 69.6 umol/(L∙h) under UV irradiation and visible radiation, which are 14.6% and 12.1% higher than those before doping, respectively.
Key words: rutile titania; Ta-doped; photocatalytic water splitting; oxygen evolution
