TiO_2纳滤膜的制备及其离子截留性能  

Preparation and Ions Retention Properties of TiO_2 Nanofiltration Membranes

作　　者：漆虹[1] 李世大[1] 江晓骆[1] 韩静[1] 

机构地区：[1]南京工业大学膜科学技术研究所,材料化学工程国家重点实验室,南京210009

出　　处：《无机材料学报》2011年第3期305-310,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金青年基金(20906047);化学工程联合国家重点实验室开放基金(SKL-ChE-09A01)~~

摘　　要：以钛酸四异丙酯为前驱体,通过聚合溶胶路线制备出平均尺寸约1.2 nm的TiO2溶胶.采用浸浆法,经过一次涂膜,在平均孔径约为3nm的片状γ-Al2O3/α-Al2O3支撑体上制备出完整无缺陷的TiO2纳滤膜.详细考察了煅烧温度对非担载膜(TiO2粉末)和TiO2纳滤膜性能的影响.在350℃的煅烧温度下制备出孔径约为1.5nm的TiO2纳滤膜,该膜对PEG的截留分子量为890,纯水渗透通量为5.3 L/(m2 h)(8×105Pa,20℃);并详细考察了该膜对NaCl、CaCl2、Na2SO4、MgCl2和Ni(NO3)25种溶液的截留性能.结果表明,在pH=4,压力5×105Pa的条件下,Ti-350膜对0.025 mol/L CaCl2和MgCl2溶液的离子截留率分别达到96.5%和92.8%.A stable TiO2 Sol with a mean particle size of 1.2 nm was synthesized with titanium isopropoxide as a precursor through polymeric Sol-Gel route.Disk-Al2O3 supported mesoporous-Al2O3 membrane with mean pore size of 3 nm was used as support for nanofiltration membranes deposition.Defect-free TiO2 nanofiltration membranes superimposed on these supports were fabricated via dip-coating method followed by drying and calcination.The effect of calcination temperature on properties of unsupported TiO2 membranes（powders） as well as supported TiO2 nanofiltration membranes was studied in detail.The MWCO,mean pore size and pure water flux of TiO2 nanofiltration membrane calcined at 350℃ were 890,1.5 nm and 5.3 L/（m2·h）（at 8×105Pa,20℃）,respectively.Ions retention properties of Ti-350 nanofiltration membrane towards five solutions like NaCl,CaCl2,Na2SO4,MgCl2 and Ni（NO3）2 were characterized.Under a pH value of 4.0 and transmembrane pressure of 5.0×105Pa,the retention properties of Ti-350 membrane towards CaCl2 and MgCl2 solutions reach maximum values of 96.5% and 92.8%,respectively.

关 键 词：陶瓷纳滤膜 TIO2 溶胶-凝胶法 离子截留 

分 类 号：TQ028[化学工程]