催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (12): 1072-1076.

• 研究论文 • 上一篇    下一篇

酞菁敏化混晶TiO2薄膜的低温制备及其对罗丹明B的催化降解

杨辉1,2,申乾宏1,高基伟1,2   

  1. 1 浙江大学材料科学与工程学系, 浙江杭州 310027; 2 浙江大学绿色建材与应用技术工程研究中心, 浙江杭州 310027
  • 收稿日期:2007-12-25 出版日期:2007-12-25 发布日期:2007-12-25

Low-Temperature Preparation of Phthalocyanine-Sensitized Mischcrystal TiO2 Film and Its Catalysis for Degradation of Rhodamine B

YANG Hui1,2*, SHEN Qianhong1, GAO Jiwei1,2   

  1. 1 Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China; 2 Green Construction Materials and Applied Technology Engineering Research Center, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2007-12-25 Online:2007-12-25 Published:2007-12-25

PDF

928

被引次数

53

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.

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

Abstract: 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 product is subsequently degraded. The catalytic activity of the CuPcTs-TiO2 film samples becomes stable after being used2-3times. 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.

Key words: copper(Ⅱ) phthalocyanine tetrasulfonic acid, sensitization, titania, low-temperature preparation, rhodamine B, degradation, photocatalysis, visible light