摘要
以钛酸四丁酯为前体、聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物为模板剂,采用溶胶-凝胶辅助微波加热法或常规加热法制备了介孔SO42-/Nb-TiO2@SiO2光催化剂,采用XRD、TEM、XPS、N2吸附-脱附和UV-Vis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SO42-/0.25%Nb-TiO2@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增强,紫外光下60 min时甲基橙脱色率为99.28%,可见光下40 h时甲基橙脱色率为84.43%。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。
Mesoporous SO4^2-/Nb-TiO2@SiO2 photocatalysts were prepared by sol-gel assisted microwave or conventional heating method using tetrabutyl titanate as the precuesor 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 photocatalytic activity of SO4^2-/Nb-TiO2@SiO2 （n（Nb） ： n（Yi） 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 99.28% 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.
出处
《石油化工》
CAS
CSCD
北大核心
2013年第8期921-927,共7页
Petrochemical Technology
基金
国家自然科学基金项目(21274131
51203139
21161009)
江西省自然科学基金项目(20132BAB203023
20132BAB203004)
江西省教育厅科技基金项目(GJJ13723)
浙江省重中之重学科开放基金项目(20121137)
