催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (6): 1076-1082.DOI: 10.3724/SP.J.1088.2011.10336

• 研究论文 • 上一篇    

无定形 TiO2 可见光敏化降解染料污染物

王齐1,*, 赵进才2, 丛燕青1, 张轶1   

  1. 1浙江工商大学环境科学与工程学院, 浙江杭州 310018; 2中国科学院化学研究所北京分子科学国家实验室, 北京 100190
  • 收稿日期:2011-04-08 修回日期:2011-05-06 出版日期:2011-06-21 发布日期:2014-10-31

Photo-sensitized Degradation of Dye Pollutants on Amorphous TiO2 under Visible Light Irradiation

WANG Qi 1,*, ZHAO Jincai 2, CONG Yanqing1, ZHANG Yi1   

  1. 1School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang, China; 2Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2011-04-08 Revised:2011-05-06 Online:2011-06-21 Published:2014-10-31

PDF

2107

被引次数

41

摘要： 采用一步水解法制备了无定形 TiO2 (Am-TiO2), 并运用 X 射线衍射、X 射线光电子能谱、N2 吸附-脱附和紫外-可见漫反射光谱等手段对其进行了表征. 结果表明, Am-TiO2 具有大的比表面积 (216 m2/g) 和丰富的表面羟基/化学吸附的水. 与晶态 TiO2 相比, Am-TiO2 的吸收带边明显蓝移 (411 nm→378 nm), 禁带宽度增加. 可见光照射 (λ > 420 nm) 下 Am-TiO2 样品能快速敏化降解罗丹明 B (RhB), 近一级反应速率常数 (k = 0.0325 min?1) 分别为锐钛矿相 TiO2 和商业化 P25 的 6.5 倍和 5.2 倍, 且 RhB 降解以脱 N-乙基和发色团开环同时进行; 而晶态 TiO2 体系中, RhB 以发色团开环为主. 矿化/脱 N-乙基分别是由于 RhB 通过 –COOH 或–N+Et2 与催化剂表面作用所致. Am-TiO2 催化剂重复使用性能良好, 重复使用 4 次后, RhB 的降解速率没有明显变化.

关键词: 无定形, 二氧化钛, 罗丹明 B, 光催化, 可见光

Abstract: Amorphous TiO2 (Am-TiO2) was prepared via a simple step through hydrolysis. The as-prepared Am-TiO2 was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy, and N2 adsorption-desorption. Large surface area (216 m2/g) and abundant surface hydroxyl group/chemical adsorbed water were observed on Am-TiO2. Compared with crystallized TiO2, the adsorption edge of Am-TiO2 exhibited a blue shift (from 411 to 378 nm). Rapid photo-sensitized degradation of rhodamine B (RhB) was achieved on Am-TiO2 under visible light (λ > 420 nm) irradiation. The pseudo-first-order rate constant (k = 0.0325 min-1) was 6.5 and 5.2 times that of anatase and TiO2 P25, respectively. Moreover, both the N-deethylation and cleavage of chromophore ring structure of RhB were observed on Am-TiO2 while only the latter path predominated on crystallized TiO2. The difference between cleavage of chromophore ring structure and N-deethylation was ascribed to different anchoring groups of RhB on TiO2 through –COOH and –N+Et2, respectively. Testing in 4 recycle experiments, the degradation rate of RhB did not change significantly, indicating the excellent stability and reusability of the Am-TiO2 photocatalyst.

Key words: amorphous, titanium dioxide, rhodamine B, photocatalytic, visible light