期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 214, 期 -, 页码 195-203出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2015.04.027
关键词
Nanofiltration; Ceramic membrane; gamma-alumina; High-flux
类别
资金
- National High Technical Research Program of China [2012AA03A606]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Peak Specialists in Six Industries High-level Specialist Fund of Jiangsu Province [2012JNHB016]
- Major Program of the Nature Science for Higher Education Institutions of Jiangsu Province [12KJA530001]
Membrane technology has become a low-cost and high-efficiency separation technology for industrial processes over the past decennia. The colloidal route is an environmentally benign process for the preparation of ceramic membranes by using water as solvent. A stable, colloidal boehmite sol with an average particle size of 16 nm was prepared from aluminum tri-sec-butoxide using water as a solvent in the pH range of 3-4. Acetic acid was used as the peptizing agent instead of nitric acid. The stable sol was used to fabricate gamma-alumina nanofiltration membranes on alpha-alumina microfiltration substrates by a dip-coating approach. The effects of the peptizing agents on the properties of the sols and the membranes were investigated. gamma-alumina nanofiltration membranes with an average membrane thickness of 1.8 mu m were obtained after sintered at 600 degrees C for 2 h. The molecular weight cut-off of the gamma-alumina nanofiltration membranes, as obtained by filtration of an aqueous PEG solution, was approximately 1 kDa. This membrane also showed a typical retention for monovalent ions and divalent ions. Additionally, the nanofiltration membranes exhibited a relatively high pure-water flux (>20 L/(m(2) h bar)), which is four times higher than that of the gamma-alumina nanofiltration membranes reported in the literature. The contribution ratios of different microstructure factors on pure-water flux were calculated. The change in tortuosity with a contribution ratio of 75.6% was the main factor for the improvement of pure-water flux. (C) 2015 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据