Ce-TiO2-SiO2的制备及其光降解罗丹明B的动力学

doi:10.16085/j.issn.1000-6613.2016-2363

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. 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 Guodong^1,2, ZHANG Guoxian^1,2, FENG Xinyu^1,2, ZHANG Guanghua^1,2

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/Abstract

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/SiO₂（x=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

中图分类号:

O643

樊国栋, 张国贤, 冯昕钰, 张光华. Ce-TiO₂-SiO₂的制备及其光降解罗丹明B的动力学[J]. 化工进展, 2017, 36(08): 3125-3133.

FAN Guodong, ZHANG Guoxian, FENG Xinyu, ZHANG Guanghua. Preperation of Ce-TiO₂-SiO₂ and the kinetics of RhB photodegradation[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 3125-3133.

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Ce-TiO₂-SiO₂的制备及其光降解罗丹明B的动力学

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

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