离子液体-水混合溶剂中制备纳米晶TiO_2的结构特性及其光催化活性  

Structural Characterization of Nanocrystalline TiO_2 from Ionic Liquid-Water Solvent Mixture and Its Photocatalytic Activity

作　　者：闫智英[1] 武丽艳[1] 孙桂香[1] 张宁[1] 郑文君[1] 

机构地区：[1]南开大学化学学院材料化学系

出　　处：《物理化学学报》2007年第7期1032-1036,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20273033;20571044)资助项目

摘　　要：以钛酸四丁酯为原料,离子液体1-乙基-3-甲基咪唑醋酸盐([EMIM]+AcO-)-水为混合溶剂,通过低温水热法制备了锐钛矿相TiO2纳米晶.用XRD、N2吸附-脱附、XPS及UV-Vis漫反射等技术对产物的晶相、比表面积、表面性质及光吸收性进行表征,并以甲基橙水溶液为研究对象,考察了产物的光催化活性及催化剂用量、溶液酸碱度对其的影响.结果表明,离子液体-水混合溶剂中反应24h所得到的TiO2具有较高光催化活性,并明显优于DegussaP25,这一结果可归因于其具有较高的锐钛矿含量和较大的比表面积.Nanocrystalline TiO2 was synthesized by the low-temperature hydrothermal method using ionic liquid （1- ethyl-3-methyl-imidazole acetate）-water mixture as solvent; various studies such as X-ray diffraction, Brunauer- Emmett-Teller surface area, X-ray photoelectron spectra, UV-Vis spectroscopy were conducted. The products prepared from ionic liquid-water mixture possessed good anatase crystallinity and contained less brookite phase than that from pure water. The photocatalytic degradation of methyl orange in water was studied in photoreactor with UV lamp as light source. The product prepared from ionic liquid-water solvent for 24 h showed superior photocatalytic activity for the degradation of methyl orange compared to commercial TiO2, Degussa P25. The higher photocatalytic activity was attributed to the crystal phase, grain size, and specific surface area of the catalyst. Further, the effects of the catalyst amount and pH value of solution on the photocatalytic activity of the product were also investigated.

关 键 词：二氧化钛 离子液体 低温水热 甲基橙 光催化活性 

分 类 号：O614.411[理学—无机化学] O644.1[理学—化学]