High flux ultrafiltration membranes based on electrospun nanofibrous PAN scaffolds and chitosan coating
High flux ultrafiltration membranes based on electrospun nanofibrous PAN scaffolds and chitosan coating
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DOI：
10.1016/j.polymer.2006.01.042
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发表时间：
2006-03-22
期刊：
影响因子：
4.6
通讯作者：
Chu, B
中科院分区：
文献类型：
--
作者：
Yoon, K;Kim, K;Chu, B
用于水处理的传统超滤（UF）或纳滤（NF）过滤器基于多孔膜，通常通过相浸入法制造。这些膜中的扭曲孔隙率通常导致相对较低的通量率。在这项研究中，我们展示了一种新型高通量超滤/纳滤介质，其基于电纺纳米纤维支架（例如聚丙烯腈、PAN），加上一层亲水、防水但透水的薄顶层涂层（例如壳聚糖）。这种纳米纤维复合膜可以取代传统的多孔膜，并表现出更高的水过滤通量。非织造纳米纤维支架的互连孔隙率可以通过静电纺丝处理改变纤维直径（从约100纳米到几微米）来部分控制。示例膜含有平均直径为 124 至 720 nm 的电纺 PAN 支架，孔隙率为约 70%，以及厚度约为 1 μm 的壳聚糖顶层，尽管尚未完全优化，但在 24 It 的操作中表现出比商业 NF 膜高一个数量级的通量率，同时保持与含油废水过滤相同的截留效率（> 99.9%）。 (c) 2006 Elsevier Ltd. 保留所有权利。
Conventional ultrafiltration (UF) or nanofiltration (NF) filters for water treatments are based on porous membranes, typically manufactured by the phase immersion method. The torturous porosity in these membranes usually results in a relatively low flux rate. In this study, we demonstrated a new type of high flux UF/NF medium based on an electrospun nanofibrous scaffold (e.g. polyacrylonitrile, PAN) coupled with a thin top layer of hydrophilic, water-resistant, but water-permeable coating (e.g. chitosan). Such nanofibrous composite membranes can replace the conventional porous membranes and exhibit a much higher flux rate for water filtration. The interconnected porosity of the non-woven nanofibrous scaffold can be controlled partially by varying the fiber diameter (from about 100 nm to a few micrometers) through the electrospinning processing. The example membrane, containing an electrospun PAN scaffold with an average diameter from 124 to 720 nm and a porosity of about 70%, together with a chitosan top layer having a thickness of about I pm, although not yet fully optimized, exhibited a flux rate that is an order magnitude higher than commercial NF membranes in 24 It of operation, while maintaining the same rejection efficiency (> 99.9%) for oily waste-water filtration. (c) 2006 Elsevier Ltd. All rights reserved.