摘要
采用超声溶胶-凝胶法,以钛酸四丁酯为前驱体,乙酰丙酮为螯合剂,硝酸为催化剂,利用超声空化效应制备颗粒粒径小且分布窄的TiO_2溶胶,考察了超声时间和超声功率对TiO_2溶胶及材料的微结构性质的影响。采用流变仪、粒径分析仪、X射线衍射(XRD)、低温N_2吸附-脱附等手段对溶胶及材料进行了系统表征。结果表明,随着超声时间和超声功率的增大,溶胶粒径逐渐变小,而对溶胶的粘度影响不大,溶胶稳定性较好;且随着超声时间和超声功率的增大,制备的TiO_2材料的孔容和比表面积逐渐增加,晶粒尺寸逐渐减小,TiO_2材料主要为锐钛矿相,因此将超声溶胶-凝胶法应用于制备小孔径二氧化钛超滤膜具有良好的应用前景。
Titanium sols with small particle size and narrow particle size distribution was obtained by ultrasonic sol-gel method, using tetrabutyl titanate as precursor, acetylacetone as chelating agent, and nitric acid as catalyst. And also the influences of ultrasonic irradiation time and intensity on titanium sols and the microstructure of titania materials were investigated. Rheometer, particle analyzer, X-ray diffraction and low temperature N_2 adsorption-desorption techniques were used to analyse the viscosity and particle size of the titania sols and the microstructure of titania materials systematically. It was showed that the diameter of titania sols became smaller, but the viscosity of titania sols changed very little under different ultrasound conditions, and also the stability of sols was very well. Moreover, with the increasing of ultrasonic time and ultrasonic intensity, specific surface area and pore volume of titania materials increased, while the sizes of titania particle decreased and also mesoporous anatase titania was obtained. Therefore, to prepare narrow pore-size TiO_2membranes have great application prospects by using ultrasonic sol-gel method.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2010年第5期447-452,共6页
Chemical Reaction Engineering and Technology
基金
国家重点基础研究发展(973)计划(2009cB623403)
江苏省高校自然科学基金(10K.JB530003)
