膜科学与技术

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A colloidal route to prepare high-flux γ-Al2O3 NF membrane

Authors： CHEN Xianfu, ZHANG Wei, FAN Yiqun

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

KeyWords： nanofiltration, ceramic membrane, sol-gel, γ-Al2O3

ClassificationCode：TQ174

year,volume(issue):pagination： 2014,34(3):48-52

Abstract：

Colloidal route is an environmental benign process for the preparation of ceramic membranes without using organic solvent. A stable colloidal boehmite sol with an average particle size of 16 nm was prepared from aluminum tri-sec-butoxide by using H2Oas solvent in the pH value of 3-4. The stable sol was used to fabricateγ-Al2O3 NF membranes on α-Al2O3 MF substrates through a dip-coating approach. The effects of calcination temperature and dipping time were investigated. As the dipping time was 60 s and the calcination temperature was 600 ℃, γ-Al2O3 NF membranes with an average membrane thickness of 1.8 μm were obtained. The MWCO of γ-Al2O3 NF membranes, obtained by filtration of an aqueous PEG solution, was about 1000 Da, which corresponds to an average pore size of ca. 1.6 nm. Meanwhile, the NF membranes showed relative high pure water flux (~20 L m-2h-1bar-1). Colloidal route is suitable for the preparation of γ-Al2O3 NF membrane.

Funds：

国家“863”计划课题(2012AA03A606)、江苏高校优势学科建设工程资助项目

AuthorIntro：

陈献富(1989-), 男, 江苏省淮安市人, 硕士, 从事膜分离材料的研究与应用. *通讯联系人

Reference：

Colloidal route is an environmentally benign process for the preparation of ceramic membranes without using organic solvent. A stable colloidal boehmite sol with an average particle size of 16 nm was prepared from aluminum tri-sec-butoxide by using H2O as solvent in the pH value of 3-4. The stable sol was used to fabricate γ-Al2O3 NF membranes on α-Al2O3 MF substrates through a dip-coating approach. The effects of calcination temperature and dipping time were investigated. As the dipping time was 60 s and the calcination temperature was 600 oC, γ-Al2O3 NF membranes with an average membrane thickness of 1.8 μm were obtained. The MWCO of γ-Al2O3 NF membranes, obtained by filtration of an aqueous PEG solution, was about 1000 Da, corresponding to an average pore size of ca. 1.6 nm. Meanwhile, the NF membranes showed relative high pure water flux (~20 L m-2h-1bar-1). Colloidal route is suitable for the preparation of γ-Al2O3 NF membrane

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