Dual layer composite nanofiltration hollow fiber membranes for low-pressure water softening

被引:51
作者
Setiawan, Laurentia [1 ]
Shi, Lei [1 ,2 ]
Wang, Rong [1 ,2 ]
机构
[1] Nanyang Technol Univ, Singapore Membrane Technol Ctr, Singapore 639798, Singapore
[2] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
基金
新加坡国家研究基金会;
关键词
Nanofiltration; Water softening; Dual layer hollow fiber membrane; WASTE-WATER; POLYAMIDE-IMIDE; OSMOSIS; POLYMERIZATION; FABRICATION; SEPARATION; RETENTION; REMOVAL;
D O I
10.1016/j.polymer.2013.12.032
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Nanofiltration (NF) membrane process has become increasingly attractive due to their unique characteristics to selectively remove specific compounds or ions. The most commonly NF membranes are negatively charged which is unsuitable for hardness removal. Therefore, the development of novel NF membranes with a positively charged skin has become a key issue for low pressure water softening. In this study, dual layer microporous hollow fiber membranes were fabricated using Torlon poly(amide-imide) (PAD as the material of the selective outer layer and polyethersulfone (PES) as the material of the porous support inner layer. A positively charged NF-like selective layer was developed by a simple polyelectrolyte cross-linking using polyallylamine (PAAm). The newly developed (PAI-PAAm)-PES dual layer hollow fiber membranes show a salt water permeability of 15.8 L/m(2) h bar and high Mg2+ and Ca2+ rejections of 94.2% and 92.3%, respectively, at operating pressure of 2 bar using a 3000 ppm TDS feed solution. This study provides a simple and effective approach to produce positively charged NF hollow fiber membranes for water softening applications with low energy consumption. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1367 / 1374
页数:8
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