一种可见光响应纳米TiO2催化剂的表面吸附特性及超声处理作用  

Surface Adsorption Status of Nanosized TiO_2 Photocatalyst and its Change after Ultrasonic Treatment

作　　者：夏平[1] 唐培松[1,2] 陈冠钦[2] 洪樟连[2] 

机构地区：[1]湖州师范学院化学系,浙江湖州313000 [2]浙江大学材料科学与工程学系,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期295-298,共4页Rare Metal Materials and Engineering

基　　金：浙江省教育厅项目(20030265);浙江省科技厅项目(2003C11027)资助

摘　　要：以钛酸丁酯和丙酮为主要原料,采用丙酮溶剂水热法合成了单相锐钛矿型纳米TiO2粉体。利用漫反射吸收谱(DRS)、气相色谱-质谱(GC-MS)、紫外-可见光谱(UV-Vis)及综合热分析(DTA-DTG)等手段,研究了纳米TiO2催化剂的可见光响应与表面吸附特性。结果表明:所合成的纳米TiO2催化剂具有优良的可见光响应特性;纳米TiO2表面除吸附有水和残留溶剂外,还吸附了在高温高压反应条件下形成的有机类物质。纳米TiO2催化剂经超声处理研究发现,TiO2的表面吸附物在超声时发生了一定程度的脱附,同时超声处理后的试样其可见光催化活性也发生了明显变化。Nanosized anatase TiO2 photocatalyst was synthesized by hydrothermal method with acetone and tetrabutyl titanate （TEOT） as raw materials. DRS, GC-MS and DTA-DTG were used to characterize surface adsorption status and visible-light response of the as-prepared TiO2 photocatalyst. The results show that the TiO2 photocatalyst has excellent visible-light response. It was revealed that, besides H2O and residue solvents adsorbed on the surface of nanosized TiO2, the surface adsorption compounds may contain aromatic compounds formed under high-pressure steam condition. It was found that, for TiO2 photocatalysts obtained after ultrasonic treatment with various time, the surface adsorption compounds were desorbed partly. The visible-light photocatalytic efficiency were found to change in a similar way.

关 键 词：纳米二氧化钛 表面吸附 可见光催化 超声处理 

分 类 号：O643.36[理学—物理化学]