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离子液体-水混合溶剂中制备纳米晶TiO2的结构特性及其光催化活性

Structural Characterization of Nanocrystalline TiO2 from Ionic Liquid-Water Solvent Mixture and Its Photocatalytic Activity

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【作者】 闫智英武丽艳孙桂香张宁郑文君

【Author】 YAN Zhi-Ying1,2 WU Li-Yan1 SUN Gui-Xiang1 ZHANG Ning1 ZHENG Wen-Jun1,(1Department of Materials Chemistry,College of Chemistry,Nankai University,Tianjin 300071,P.R.China;2Department of Applied Chemistry,Yunnan University,Kunming 650091,P.R.China)

【机构】 南开大学化学学院材料化学系南开大学化学学院材料化学系 天津300071云南大学应用化学系昆明650091天津300071

【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.

【Abstract】 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.

【基金】 国家自然科学基金(20273033,20571044)资助项目
  • 【文献出处】 物理化学学报 ,Acta Physico-Chimica Sinica , 编辑部邮箱 ,2007年07期
  • 【分类号】O614.411;O644.1
  • 【被引频次】13
  • 【下载频次】542
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