锐钛矿TiO_2溶胶紫外、可见、红外光降解罗丹明B  

Photo Degradation on Rhodamine B for Anatase TiO_2 Sol under UV,Visible Light and IR

作　　者：高基伟[1,2] 申乾宏[1] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027 [2]浙江大学绿色建材与应用技术工程研究中心,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期20-23,共4页Rare Metal Materials and Engineering

基　　金：国家科技支撑计划(2006BAJ05B05);浙江省科技计划(2005C24005)资助

摘　　要：采用溶胶．凝胶合成路线，通过反应体系的配方设计和工艺控制，在常温下获得含有锐钛矿晶体的氧化钛溶胶。核磁共振证实，前驱体钛酸丁酯在水过量体系中完全水解，生成无机产物；透射电镜中，可观察到溶胶中纳米级的正方体形锐钛矿晶体；在200～1000nm波段内整百单波长光线照射下，溶胶均可使罗丹明B降解，即溶胶具有紫外、可见、近红外的宽光谱激发响应能力。量子效应产生的亚稳态次能级和原位生长导致的晶体缺陷，可拓宽氧化钛对光线的利用范围，并提高电子和空穴的量子产率。TiO2 sol containing nano anatase crystals was prepared at room temperature in a designed reaction system through a controlled sol-gel way. Nuclear Magnetic Resonance confirmed that Ti （OC4H9） 4 had hydrolyzed thoroughly and produced inorganic products in the final sol. In the image of Transmission Electron Microscope, there are nanometer cubic anatase TiO2 crystals. The sol can photodecompose Rhodamine B under every single hundred wavelength lights during 200-1000 nm, which means that the sol can response to UV lights, visible lights and near infrared lights. The metastable energy levels, created by the quantum effect of the nano crystals, and the crystalline defects, induced by the in-suit growth of the anatase crystals in the liquid, can together broaden the range of lights that can be used by TiO2, and improve the quantum production of excited electrons and holes.

关 键 词：锐钛矿溶胶 可见激发 红外响应 亚稳态次能级 晶体缺陷 

分 类 号：O643.32[理学—物理化学]