酞菁敏化混晶TiO_2薄膜的低温制备及其对罗丹明B的催化降解  

Low-Temperature Preparation of Phthalocyanine-Sensitized Mischcrystal TiO_2 Film and Its Catalysis for Degradation of Rhodamine B

作　　者：杨辉[1] 申乾宏[1] 高基伟[1] 

机构地区：[1]浙江大学材料科学与工程学系

出　　处：《催化学报》2007年第12期1072-1076,共5页

基　　金：国家科技支撑计划项目(2006BAJ05B05);浙江省科技计划项目(2005C24005)

摘　　要：以四磺酸酞菁铜(CuPcTs)为敏化剂,采用溶胶-凝胶法制备了酞菁敏化的TiO2溶胶,经浸渍提拉成膜并室温晾干,制得CuPcTs-TiO2薄膜.采用XRD,UV-Vis和SEM等测试手段对薄膜样品进行了表征,并通过罗丹明B的降解考察了薄膜的可见光催化性能.结果表明,TiO2为锐钛矿-板钛矿-金红石混晶结构,CuPcTs-TiO2薄膜对罗丹明B降解具有较高的光催化活性.CuPcTs敏化能有效提高TiO2的可见光催化活性,但过多的CuPcTs会使催化活性降低.在可见光照射条件下,罗丹明B主要是先脱乙基生成罗丹明,然后再逐步被分解.CuPcTs-TiO2薄膜在经2～3次循环使用后,其光催化活性趋于稳定.CuPcTs可牢固地负载于TiO2薄膜中,从而保证了CuPcTs-TiO2薄膜重复使用的稳定性.Phthalocyanine-sensitized TiO2 sol samples were prepared through a sol-gel method using copper（ Ⅱ ） phthalocyanine tetrasulfonic acid （CuPcTs） as a sensitizer. Phthalocyanine-sensitized TIO2（CuPcTs-TiO2） film samples were obtained from the as-prepared TiO2 sol by a dip-coating technique at room temperature. XRD, UV-Vis, and SEM were adopted to characterize the samples, and the degradation of rhodamine B was employed as the model reaction to evaluate the photocatalytic activity of CuPcTs-TiO2 film under the visible light. The results indicated that the TiO2 film is composed of the anatase-brookite-rutile mischcrystal phase, and thus the CuPcTs-TiO2 film samples have higher catalytic activity. The sensitization of CuPcTs can enhance visible-light catalytic activity of the TiO2 film, but too much CuPcTs can decrease its catalytic activity. Under the visible light illumination, rhodamine B first turns into rhodamine via the N-de-ethylation, and the intermediate prod- uct is subsequently degraded. The catalytic activity of the CuPcTs-TiO2 film samples becomes stable after being used 2-3 times. The preparation method is favorable for the firm loading of CuPcTs in TiO2 film, and thus ensures the stability for repeated use of the CuPcTs-TiO2 film.

关 键 词：四磺酸酞菁铜 敏化 二氧化钛 低温制备 罗丹明B 降解 光催化 可见光 

分 类 号：O643.3[理学—物理化学]