化工进展 ›› 2017, Vol. 36 ›› Issue (08): 3125-3133.DOI: 10.16085/j.issn.1000-6613.2016-2363

• 资源与环境化工 • 上一篇    

Ce-TiO2-SiO2的制备及其光降解罗丹明B的动力学

樊国栋1,2, 张国贤1,2, 冯昕钰1,2, 张光华1,2   

  1. 1. 陕西科技大学化学与化工学院, 陕西 西安 710021;
    2. 教育部轻化工助剂化学与技术重点实验室, 陕西 西安 710021
  • 收稿日期:2016-12-20 修回日期:2017-03-27 出版日期:2017-08-05 发布日期:2017-08-05
  • 通讯作者: 樊国栋(1964-),男,博士,教授,研究方向为光降解催化。
  • 作者简介:樊国栋(1964-),男,博士,教授,研究方向为光降解催化。E-mail:fangd@sust.edu.cn。
  • 基金资助:
    陕西省科技攻关项目(2014K08-12)、陕西省教育厅重点实验室科研计划(14JS015)及陕西科技大学研究生创新基金项目。

Preperation of Ce-TiO2-SiO2 and the kinetics of RhB photodegradation

FAN Guodong1,2, ZHANG Guoxian1,2, FENG Xinyu1,2, ZHANG Guanghua1,2   

  1. 1. College of Chemistry & Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China;
    2. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education. Xi'an 710021, Shaanxi, China
  • Received:2016-12-20 Revised:2017-03-27 Online:2017-08-05 Published:2017-08-05

摘要: 以钛酸丁酯、正硅酸乙酯和硝酸铈为前体,采用溶胶凝胶法制备了x% Ce-TiO2/SiO2x=0,0.1,0.3,0.5,0.8,1,质量分数)光降解催化剂。X射线衍射(XRD)测试表明,Ce的掺杂和SiO2的引入能够有效抑制TiO2晶相由锐钛矿相向金红石相的转变,增加了样品的热稳定性。X射线光电子能谱(XPS)和傅里叶红外光谱(FTIR)分析表明,样品Ce-TiO2/SiO2中存在Si-O-Ti和Si-O-Si键,说明SiO2和TiO2有键合作用。扫描电镜(SEM)和BET结果表明,相比于纯TiO2,0.3% Ce-TiO2/SiO2的颗粒尺寸更小,颗粒分布更加均匀,且比表面积更大(194.98m2/g)。以罗丹明B(Rh B)为目标污染物,研究了Ce-TiO2/SiO2光降解催化剂在紫外光和可见光下的催化降解效率。结果表明,当m(TiO2):m(SiO2)=10:1,Ce掺杂量为0.3%时,催化剂的光催化性能达到最佳。经过30min紫外光和180min可见光的照射,对罗丹明B的降解率分别达到99%和78%。通过对降解后,苯酚溶液中总有机碳含量(TOC)去除率的研究发现,0.3% Ce-TiO2/SiO2的去除率为41%,而二氧化钛P25却不足10%。

关键词: 二氧化钛, 二氧化硅, 动力学, 溶胶凝胶法, 催化剂

Abstract: The photocatalysts of x%Ce-TiO2/SiO2(x=0,0.1,0.3,0.5,0.8,1,mass fraction)were prepared with Si(OC2H5)4,Ti(OC2H5)4 and Ce(NO3)3·6H2O as precursors via a sol-gel method. The XRD date showed that thermal stability of TiO2 can be improved by introducing Cerium and SiO2 into it,and phase transformation from anatase to rutile can be inhibited effectively. The analysis results of XPS and FTIR showed that chemical bonds are formed between TiO2 and SiO2 by the appearance of Si-O-Ti and Si-O-Si bonds in 0.3% Ce-TiO2/SiO2. The result of SEM and BET showed that 0.3%Ce-TiO2/SiO2 has smaller particle size,more uniform size distribution and larger specific surface area(194.98m2/g) than pure TiO2. The Rh B was used as the target pollutant,and effects of cerium content on photodegradation efficiency of Ce-TiO2/SiO2 were studied under the condition of ultraviolet light and visible light irradiation. The results showed that the TiO2 10% SiO2 and 0.3% Ce has the best photo-degradation performance. The degradation efficiency could reach to 99% and 78% after reaction for 30min under the ultraviolet light and 180min visible light irradiation,respectively. Compared to P25(8%),the removal rate(41%)of TOC of 0.3%Ce-TiO2/SiO2 showed higher degaradation of phenol.

Key words: titanium dioxide, kinetics, silica dioxide, sol-gel method, catalyst

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