Preparation of composite hollow fiber membranes: co-extrusion of hydrophilic coatings onto porous hydrophobic support structures
Preparation of composite hollow fiber membranes: co-extrusion of hydrophilic coatings onto porous hydrophobic support structures
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DOI：
10.1016/s0376-7388(02)00118-7
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发表时间：
2002-09-15
影响因子：
9.5
通讯作者：
Wessling, M
中科院分区：
文献类型：
--
作者：
He, T;Mulder, MHV;Wessling, M
在支撑膜上涂覆一层可以作为膜表面功能化的一种手段。通常，此过程分为两个步骤。在本文中，我们描述了一种膜制备的概念，即通过共挤出工艺一步在支撑膜上原位形成一层涂层。我们的目标是在聚砜载体上涂覆一层薄的离子交换层(磺化聚醚砜，SPES)。对离子交换材料在疏水支撑膜(聚砜)上的机械稳定性和附着力进行了系统的初步原理验证实验，然后进行了单层和双层平板浇注。通过后面的实验量化的关键参数被转化为共挤出纺丝过程。由于SPES的离子交换能力较低，复合中空纤维膜作为支撑液膜对铜的去除通量较低。气体对的选择性接近1，表明复合膜的涂层是多孔的。然而，我们的新复合膜具有良好的纳滴特性：它通过单价和二价无机盐，但拒绝更大的带电有机分子。实验工作表明，即使载体和涂层材料的亲水性有很大不同，共挤出也是一种可行的工艺，可以一步连续地制备表面定制的中空纤维膜。(C)2002 Elsevier Science B.V.保留所有权利。
Coating a layer onto a support membrane can serve as a means of surface functionalization of membranes. Frequently, this procedure is a two-step process. In this paper, we describe a concept of membrane preparation in which a coating layer forms in situ onto a support membrane in one step by a co-extrusion process. Our aim is to apply a thin ion exchange layer (sulfonated polyethersulfone, SPES) onto a polysulfone support. The mechanical stability and adhesion of the ion-exchange material to the hydrophobic support membrane (polysulfone) has been studied by a systematic approach of initial proof-of-principle experiments, followed by single layer and double-layer flat sheet casting. Critical parameters quantified by the latter experiments are translated into the co-extrusion spinning process. The composite hollow fiber membrane has low flux as a supported liquid membrane for the copper removal due to the low ion exchange capacity of the SPES. The coating layer of the composite membrane is porous as indicated by gas pair selectivity close to unity. However, our new composite membrane has good nanotiltration properties: it passes mono and bivalent inorganic salts but rejects larger charged organic molecules. The experimental work demonstrates that co-extrusion can be a viable process to continuously prepare surface tailored hollow fiber membranes in a one-step process, even if the support and coating material differ significantly in hydrophilicity. (C) 2002 Elsevier Science B.V. All rights reserved.