CAJ | 학술논문

以钛酸正丁酯为前驱物,采用溶胶-凝胶低温水热方法,以离子液体(1-乙基-3-甲基咪唑醋酸盐)和水为混合溶剂,制备了锐钛矿相的纳米二氧化钛.产物经XRD,TEM,N2吸附-脱附等表征,结果表明与纯水相比,混和溶剂中制备的二氧化钛具有较高的纯度,结晶度和热稳定性,且缩短反应时间到24 h,所得颗粒尺寸10 nm与在纯水中反应48 h所得颗粒尺寸7 nm相当,说明离子液体的存在可促进锐钛矿相二氧化钛的结晶和生长.另外,该产物表面积可达238 m2·g-1.本文还进一步研究了该产物对甲基橙水溶液的光降解作用,结果表明,用此方法制备的TiO2对甲基橙降解作用优于商业P25二氧化钛.
이태산정정지위전구물,채용용효-응효저온수열방법,이리자액체(1-을기-3-갑기미서작산염)화수위혼합용제,제비료예태광상적납미이양화태.산물경XRD,TEM,N2흡부-탈부등표정,결과표명여순수상비,혼화용제중제비적이양화태구유교고적순도,결정도화열은정성,차축단반응시간도24 h,소득과립척촌10 nm여재순수중반응48 h소득과립척촌7 nm상당,설명리자액체적존재가촉진예태광상이양화태적결정화생장.령외,해산물표면적가체238 m2·g-1.본문환진일보연구료해산물대갑기등수용액적광강해작용,결과표명,용차방법제비적TiO2대갑기등강해작용우우상업P25이양화태.
Titania was prepared in the mixture solvent of ionic liquid (1-ethyl-3-methyl-imidazole acetate [EmIm+AcO-]) and water by sol-gel low temperature hydro-thermal treatment of tetrabutyl titanate. The sample was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform-IR spectroscopy and nitrogen adsorption-desorption isotherms. The results show that the anatase titania, with an average grain sizeof 10 nm and specific surface area of 238 m2.g-1, is better in purity, crystallinity and thermal stability compared with that prepared in pure water. Moreover, the reaction time in mixture solvent is reduced to half of that in pure water for about the same crystalline size. The photocatalytic activity of the samples was evaluated by photocatalytic decolorization of methyl orange in water. The results also indicate that the titania prepared in this work displays a better activity than the commercial degussa P25.