酞菁敏化纳米TiO2的水热法原位合成及其可见光催化性能

Copper(Ⅱ) Phthalocyanine Tetrasulfonate Sensitized Nanocrystalline TiO_2: in-Situ Hydrothermal Synthesis and Photocatalysis under Visible Light

以钛酸丁酯为原料、三乙醇胺作络合剂、酞菁铜(CuPcTs)为敏化剂,采用水热法原位制备了CuPcTs/TiO2复合纳米光催化剂,通过XRD、TEM、DRS等对其进行了表征,通过光催化降解甲基橙(MO)对其可见光催化性能进行了研究。结果表明:所制得的样品中,TiO2呈锐钛矿晶型。颗粒尺寸在20～30 nm之间,具有较好的分散性;CuPcTs的存在能有效拓展TiO2吸收光谱至可见光区,并与TiO2协同作用,使之在可见光范围具有明显的光催化性能;原位合成的CuPcTs/TiO2光催化剂的可见光催化性能明显高于浸溃法制备的CuPcTs/P25光催化剂;敏化剂的含量及热处理温度对复合光催化剂的活性有很大的影响,均存在一个最佳值。

Copper（Ⅱ） phthaiocyanine tetrasuifonate sensitized nanocrystailine titania photocatalysts were prepared through hydrothermai in-situ synthesis. The as-prepared samples were characterized by X-ray diffraction （XRD）, Transmission electron microscopy （TEM） and UV-Vis diffuse reflectance spectroscopy （DRS）. The photocatalytic activity of the products was evaluated by the photocatalytic decomposition of methyl orange under visible light （λ〉450 nm）. The XRD patterns demonstrated that TiO2 was anatase structured, and the TEM images displayed that the average particle sizes of the as-prepared powders were 20--30 nm. The DRS data indicated that the CuPcTs/TiO2 had obvious absorption band in the visible light region. The results of photodecomposition of methyl orange revealed that CuPcTs/TiO2 had much more photocatalytic activity under the visible light （λ〉450 nm） than CuPcTs/P25 prepared by absorption. The photocatalytic activity of CuPcTs/TiO2 was influenced greatly by the concentration of CuPcTs and temperature of heat treatment.