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以钛酸四异丙酯为前驱体,通过颗粒溶胶路线制备出平均粒径为41nm的TiO2溶胶,并以此溶胶制备出稳定的制膜液。采用浸浆法,经过一次涂膜和在400～600℃烧成,在平均孔径约为70nm的片状α-Al2O3支撑体上制备出完整无缺陷的截留分子量小于10000的TiO2中孔膜。考察了烧成温度对非担载TiO2粉末和TiO2中孔膜性能的影响。结果表明:在400℃烧成3h可制备出孔径为4.7nm的TiO2中孔膜,其对PEG的截留分子量为8150,在0.8MPa,20℃下,纯水渗透通量为30L/(m2·h),对pH=3的Ni(NO3)2溶液的截留率达到95.14%。
With tetraisopropyl titanate as precursor, a titania sol with the average particle size of 41 nm was prepared by particle sol route, and a stable film forming solution was prepared by this sol. The complete mesoporous TiO2 membrane with molecular weight less than 10,000 was prepared by dip-coating method after one coating and firing at 400-600 ℃ on the sheet-like α-Al2O3 support with the average pore size of about 70nm. The effect of sintering temperature on the properties of non-supported TiO2 powder and TiO2 membrane was investigated. The results showed that the mesoporous TiO2 membrane with pore size of 4.7nm can be prepared by calcining at 400 ℃ for 3h. The molecular weight cut-off of PEG is 8150. The permeation flux of pure water is 30L / (m2 · h), the rejection of Ni (NO3) 2 solution with pH = 3 reached 95.14%.