改性二氧化钛对X-3B的光催化性能及降解动力学研究

Study on the photocatalysis performance and degradation kinetics of X-3B over modified titanium dioxide.

作者信息

Qi Xin-Hua, Wang Zhong-Hua, Zhuang Yuan-Yi, Yu Ying, Li Jia-Ling

机构信息

College of Environmental Science and Engineering of Nankai University, Tianjin 300071, PR China.

出版信息

J Hazard Mater. 2005 Feb 14;118(1-3):219-25. doi: 10.1016/j.jhazmat.2004.11.007.

DOI:10.1016/j.jhazmat.2004.11.007

PMID:15721547

Abstract

In this paper, reactive brilliant X-3B was used as a model compound to study the photocatalytic activity of TiO2. Experimental results showed that the adulteration of iron and silver on TiO2 could greatly improve the activity of TiO2, and the optimum adulteration amount of iron and silver was 0.1 wt.% (Fe/TiO2) and 0.05 wt.% (Ag/TiO2), respectively, at the adulteration range of experiments. The photocatalytic degradation kinetics of X-3B on TiO2, Fe/TiO2 and Ag/TiO2 were also studied. The results showed that the degradation of X-3B on all of them were in accordance with the Langmiur-Hinshelwood kinetics model well, and the sequence of apparent reaction rate constants k of X-3B degradation catalyzed by TiO2, Fe/TiO2 and Ag/TiO2 was Ag/TiO2>Fe/TiO2>TiO2, while adsorption equilibrium constants KA of X-3B on Fe/TiO2 and Ag/TiO2 were approximately the same, and both were greater than that of TiO2.

摘要

本文以活性艳红X-3B为模型化合物研究TiO₂的光催化活性。实验结果表明，铁和银掺杂到TiO₂中可大大提高其活性，在实验掺杂范围内，铁和银的最佳掺杂量分别为0.1 wt.%（Fe/TiO₂）和0.05 wt.%（Ag/TiO₂）。还研究了X-3B在TiO₂、Fe/TiO₂和Ag/TiO₂上的光催化降解动力学。结果表明，X-3B在所有这些催化剂上的降解都很好地符合Langmiur-Hinshelwood动力学模型，TiO₂、Fe/TiO₂和Ag/TiO₂催化X-3B降解的表观反应速率常数k的顺序为Ag/TiO₂>Fe/TiO₂>TiO₂，而X-3B在Fe/TiO₂和Ag/TiO₂上的吸附平衡常数KA大致相同，且均大于TiO₂上的吸附平衡常数。