Nb-TiO2@SiO2及其光催化性能.pdf

石油化工
2013年第42卷第8期
PETROCHEMICAL TECHNOLOGY
微波辅助制备介孔SO4/Nb-TiO2@SiO2
及其光催化性能
占昌朝…2,钟明强,陈枫,曹小华2,孔前广2,王艺蓉2
(1.渐江工业大学化学工程与材料学院、浙江杭州310014;2.九江学院化学与环境工程学院,江西九江332005)
摘要
钛酸四丁酯为前体、聚环氧乙烷-聚环氧内烷一聚环氧乙烷三嵌段共聚物为模板剂,采用溶胶一凝胶辅助微波加热法
或常规加热法制备了介孔SO3ANb-TO2@Si0O2光催化剂,采用XRD、TEM、XPS、N2吸附-脱附和UV-Vs等技术对其进行了表
征,并以光催化降解甲基橙为模型反应考察了加热方式及Nb掺杂量对其光催化性能的影响。实验结果表明,同常规加热法相
比,微波加热法制备的SO:70.,25%Nb-TiO@のSiO2(Nb与Ti的摩尔比为0.25%)的紫外及可见光催化性能得到明显増强,紫外光
下60min时甲基橙脱色率为99,28%,可见光下40h时甲基橙脱色率为8443%。表征结果显示,微波加热法制得的光催化剂具
有较大的比表面积和孔体积、典型的锐钛矿型结构及高光生电子空穴分离效率;该光催化剂具有较好的重复使用性能。
关键词]So2ハNb- Tio (@sio2光催化剂;微波;光催化降解
文章编号j1000-8144(2013)08-0921-07
[中图分类号]TQ426.8
L文献标志码]A
Preparation of Mesoporous SOA/NB-TIO2 @Sio2 Photocatalysts via
Microwave Assisted Process and Their Photocatalytic Properties
Chen Feng, Cao Xiaohua.2, Kong Qianguang, Wang Yirong
( 1. College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou Zhejiang 310014, China
2. College of Chemistry and Environmental Engineering, Jiujiang University, Jiujiang Jiangxi 332005, China)
Abstract Mesoporous SO/NB-TIO, @sio, photocatalysts were prepared by sol-gel assisted
microwave or conventional heating method using tetrabutyl titanate as the precursor and a three block
copolymer P123 as the template, and were characterized by means of XRD, TEM, XPS, N2
adsorption-desorption and Uv-vis techniques. The effects of heating methods and Nb doping dosage on
their photocatalytic performances in the photodegradation of methyl orange were studied. The results
showed that the pho ocatalytic activity of SO./0.25%NB-TIO @Sio((N): n(T1) 0.25%)prepared by
microwave heating method was obviously enhanced under UV and visible light. The photodecolorization
rates of methyl orange under UV for 60 min and under visible light for 40 h were.28% and 84.43%
respectively. The results also indicated that the photocatalyst prepared by microwave heating method
exhibited high specific surface area and pore volume, typical anatase structure, and high separation
efficiency for photogenerated electron hole pairs. The photocatalyst also showed good reusability
Keywords O /NB-TI @ Si photocatalyst; microwave; photocatalytic degradation
TO2光催化氧化技术被广泛用于解决日益严重构坍塌、比表面积减小和晶型转变,从而导致光
的水、空气、土壤等环境污染问题,但TO:存『收稿日12013-0-12:修改稿日期1201304-02
在激发波长短、太阳能利用率低、光生电子及空穴[作者简介]占昌朝(1973ー),男,江西省九江市人,博土上生,
复合几率高、量子效率低、光催化剂吸附性能较差副教授,电话15350230,电邮zhan223163.com。联系人:
等不足,因此,开发具有可见光响应的高活性光催钟明强,电话Q071-88089电邮zhongmq(@zjut.edu.cn
化剂成为目前光催化领域的一个重要课题?。
基金项目]国家自然科学基金项日(21274131,51203139,
21161009);江西省自然科学基金项目(20132BAB203023,
介孔TiO2具有较大比表面积,有利于提高光
20132BAB203004);江西省教育厅科技基金项目(GJ3723);
催化活性,但在高温后处理过程中会发生介孔结浙江省重中之重学科开放基金项目(2012117)。