Bi掺杂纳米TiO_2光催化甘油水溶液制氢性能研究  

Photocatalytic H_2 Evolution from Glycerol Solution over Bi^(3+)-doped TiO_2 Nanoparticles

作　　者：桑换新[1,2] 田野[2] 王希涛[1] 陶磊[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津市环境保护科学研究院,天津300191

出　　处：《无机材料学报》2012年第12期1283-1288,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(21276190;20806059)~~

摘　　要：采用溶胶–凝胶法制备了TiO2和Bi掺杂的TiO2纳米颗粒,用N2吸附-脱附、SEM、XRD、FT-Raman、UV-VisDRS对光催化材料的孔结构、表面构造、能带结构、吸光特性进行了表征,并考查了其光催化甘油水溶液制氢反应的活性.结果表明:Bi掺杂后的TiO2为介孔结构的锐钛矿晶型纳米颗粒,其分散度明显增加,晶粒变小,比表面积增大;Bi掺杂使得TiO2禁带内形成杂质能级,降低了禁带能量,增加了光生电子和空穴的分离效率,有利于将TiO2的吸光带边界扩展至可见光区;Bi掺杂的TiO2样品表现出了远高于纯TiO2的光催化甘油水溶液制氢性能,2mol%Bi掺杂的样品在紫外光和模拟太阳光辐射下表现出了最高产氢活性,其速率分别为3534.8μmol/(h.gcat)和455.7μmol/(h.gcat).TiO2 and Bi3＋-doped TiO2 semiconductors were prepared by using Sol-Gel method. Their pore size distribution, crystal structure, surface composition, photo absorption properties and photocatalytic performance for H2 evolution from glycerol solution were investigated by techniques of N2 adsorption-desorption, XRD, FT-Raman, SEM, UV-Vis DRS and photocatalytic reaction. The results show that Bi3＋-doped TiO2 appears anatase phase nanoparticles with mesoporous structure and has a much smaller crystallite size and much higher BET surface area than bare TiO2. These samples exhibit a visible-light absorption capability much higher than bare TiO2, which mainly originates from the doping process with the formation of new energy level of Bi3＋ between conduction band and valence band of TiO2 to reduce the energy gap and the electron-hole recombination rate. The Bi3＋-doped TiO2 samples display improved photocatalytic H2 production from glycerol solution, and 2%Bi-doped TiO2 shows a maximum H2 production rate of 3534.8 μmol/（h.gcat） under UV irradiation and 455.7 μmol/（h.gcat） under simulated-solar irradiation, respectively.

关 键 词：Bi掺杂TiO2纳米颗粒 光催化 甘油水溶液 制氢 

分 类 号：O643[理学—物理化学]