摘要
以钛酸丁酯为钛源、MCM-41分子筛为载体,采用溶胶-凝胶法制备了掺杂与负载相结合的光催化剂Ba/TiO2/MCM-41。结果表明:Ba/TiO2/MCM-41是一种比表面积高达341.2 m2/g的介孔材料,主要晶相为锐钛矿相,比P25有更强的紫外光吸收。将Ba/TiO2/MCM-41用于光催化氧化水中的对硝基苯甲酸,当催化剂投加量为0.5 g/L,对硝基苯甲酸初始pH为4、浓度为2×10-4mol/L时,紫外光照30 min后,对硝基苯甲酸降解率达到96.0%。用紫外光谱、红外光谱和高效液相色谱分析对硝基苯甲酸降解前后的变化,发现随着光照时间延长,苯环上的硝基、羧基吸收峰逐渐减弱;对硝基苯甲酸首先被降解为一些中间小分子产物,随着反应进行,小分子物质也逐渐被降解。
A composite photoeatalyst, Ba/TiO2/MCM-41, was prepared by sol-gel method using titanate butyl acetate as titanium source and MCM-41 molecular sieve as carrier. The results showed that Ba/TiO2/MCM- 41 was a mesoporous material with the surface area of 341.15 m2/g and its main crystalline phase was still ana- tase phase, and the ultraviolet absorption of Ba/TiOJMCM-41 was stronger than [25. The photodegradation rate reached 96.0% under 30 min UV-irradiation with the dosage of 0.5 g/L of Ba/TiOJMCM-41, the initial con- centration of 2 x 10 -4mol/L and the pH of 4 of p-nitrobenzoic acid. The productions of intermediates during pho- todegradation were monitored using ultraviolet spectrum, infrared spectrum and HPLC analysis. It was found that with the increase of irradiation time, the absorption peaks of p-nitrobenzoic acid decreased,the absorption peaks of nitryl and carboxyl in benzene rings decreased and the intermediates emerged, with the reaction, small mole-cules were also degradated gradually.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第8期2629-2634,共6页
Chinese Journal of Environmental Engineering
基金
湖北省武汉市科技计划项目(200861113462)
