Preparation of Zn/TiO2 powder and its photocatalytic performance for oxidation of P-nitrophenol

• Published in: Nuclear science and techniques 2007-02, Vol.18 (1), p.59-64
• Main Authors: LIU, X, XU, Y, ZHONG, Z, FU, Y, DENG, Y
• Format: Article
• Language: English
• Subjects: 二氧化钛; 光催化性能; 对硝基酚; 金属粉末
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1016/S1001-8042(07)60020-7

Zn-doped TiO2 catalysts were prepared using a sol-gel method and characterized by XPS,UV-Vis, BET, XRD in this study. Under the irradiation of simulant sunlight, the photocatalytic activity for the degradation of p-nitrophenol was studied too. After irradiation for 2.5 h, the degradation percentage of p-nitrophenol could rise to more than 80 %. The results showed that the spectrum absorption band edge of Zn/TiO2 powder does not broaden obviously comparing with pure TiO2 powder. Zinc exists as Zn （11）. When calcined at 973 K, there is a new phase as ZnTiO3 in Zn/TiO2 catalyst. The order of photocatalytic activity of Zn/TiO2 catalysts calcined at different temperatures for p-nitrophenol is 773 K 〉 673 K 〉 873 K 〉 573 K 〉 973 K and the photocatalytic activity of Zn/TiO2 catalyst calcined at 773 K is better than TiO2 catalysts heated at the same temperature, and outclasses that of commercial TiO2 catalyst. It also showed that the photocatalytic degradation of p-nitrophenol follows first-order kinetics under the irradiation of simulant sunlight.