纳米金红石TiO2光催化剂的水解合成及其性能

Synthesis and Properties of Nano-Rutile TiO_2 Photocatalysts

采用水解法在323K制备了比表面积较大的纳米金红石TiO2光催化剂,并通过X射线衍射(XRD)、BET比表面积测试法、紫外-可见吸收光谱(UV-Vis)、红外光谱(IR)和光电化学(PEC)测量对纳米光催化剂进行了表征。以甲基橙为光催化反应的模型化合物,在比表面积相近的条件下,对纳米金红石和锐钛矿TiO2光催化剂的光催化活性进行了评价。光催化实验结果表明:比表面积为～95m2.g-1时,比表面积相近的金红石和锐钛矿的紫外光催化活性相当,但金红石的可见光催化活性明显高于锐钛矿的可见光催化活性。光电化学实验表明:在紫外光照射下催化剂的光电流密度从弱到强的顺序与其紫外光催化活性从低到高的次序一致。

Nano-rutile TiO2 photocatalysts with bigger specific surface area were prepared by a hydrolysis method at 323 K,and characterized by X-ray diffraction（XRD）,Brunauer-Emmett-Teller（BET）,ultraviolet-visible diffuse reflection spectroscopy（UV-Vis DRS）,infrared spectroscopy（IR） and photoelectrochemical（PEC）.The ultraviolet（UV） and visible light photocatalytic activities of as-prepared rutile and anatase TiO2 nano-photocatalysts with almost same specific surface areas were evaluated by methyl orange（MO） as mode compound to photocatalytic reaction.The results of the photocatalytic experiment shows that when rutile and anatase have the similar specific surface area of ~95 m2·g-1,the UV light photocatalytic activity of rutile is comparable to that of anatase,while rutile shows significantly higher visible light photocatalytic activities than anatase.The photoelectrochemical experiment shows that the order of photocurrent densities of the catalysts from weak to strong is in accordance with the order of UV light photocatalytic activities of the catalysts from low to high under UV light irradiation.