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

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

Abstract

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

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

CLC Number:

O643

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.

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.

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

Ce-TiO₂-SiO₂的制备及其光降解罗丹明B的动力学

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