SiO_2-TiO_2中空型界面光催化剂的制备及性能  

Preparation and Properties of Nanovoid SiO_2-TiO_2 Phase-Boundary Photocatalysts

作　　者：许章炼[1] 王晟[1] 王掏 王维[1] 陈文兴[1] 

机构地区：[1]浙江理工大学先进纺织材料与制备技术教育部重点实验室,浙江杭州310018

出　　处：《催化学报》2008年第10期987-991,共5页

基　　金：长江学者和创新团队发展计划(PCSIRT;IRT0654);国家自然科学基金(50802088;20574061);浙江省钱江人才计划(2008R10091);浙江省自然科学基金(Y406285);浙江理工大学科研启动基金(ZSTU;0601064-Y;0601293-Y)

摘　　要：采用十八烷基三乙氧基硅烷对TiO2和核壳中空型纳米粒子SiO2-TiO2进行了壳表面疏水烷基化修饰,制备出新型界面光催化剂,并用IR和XRD进行表征.在紫外光照射下,考察了两种界面光催化剂的光稳定性,并以弱酸性黄G溶液的界面光降解为模型反应,考察了催化剂的光催化活性.结果表明,长链烷基成功接枝在了两种纳米粒子表面,且改性前后晶型无变化.与TiO2界面光催化剂相比,SiO2-TiO2界面光催化剂不仅具有优异的界面光稳定性,同时在无搅拌状态下对弱酸性黄G溶液也有良好的光催化活性.Novel phase-boundary photocatalysts were prepared by partial modification of the surface of nanovoid SiO2-TiO2 nanoparticles with octadecyltriethoxysilane （ODTS） and characterized by IR and XRD. The photostability and the photocatalytic activity of the nanoparticles were investigated under UV light irradiation. The results showed that the alkylsilylation groups were successfully grafted on the surfaces of the two nanoparticles, and the phase transfer of the TiO2 core was not observed after ODTS modification. Compared with TiO2 nanoparticles, the surface-alkylsilylated nanovoid SiO2-TiO2 nanoparticles showed excellent photostability and high photocatalytic activity for photodegradation of weak acid yellow G solution with mechanical stirring.

关 键 词：二氧化钛 二氧化硅 中空结构 界面 纳米粒子 光催化 

分 类 号：O643.36[理学—物理化学]