单步聚电解质复合涂层在中空纤维上产生纳滤或生物催化性能

IF 4.9 Q1 ENGINEERING, CHEMICAL
Maria A. Restrepo , Johannes Kamp , Lasse Guericke , Robin Schnichels , Hannah Roth , Matthias Wessling
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引用次数: 1

摘要

近年来,通过逐层(LBL)方法用聚电解质改性膜已成为最新技术。它用于制造纳滤中空纤维膜或将生物分子固定在膜表面。然而,这仍然是一个耗时的过程。相反,这项工作探索了用含有聚阴离子和聚阳离子的涂层溶液进行一步膜改性。涂层溶液中的高盐浓度抑制了在涂层之前聚电解质的络合。然后,在涂覆期间盐浓度的受控降低触发在膜上形成聚电解质复合物层。提出了三种涂布方法:(1)在界面络合(IC)中,聚电解质溶液涂布在膜上,然后用水冲洗沉淀。(2) 扩散脱盐(DDS)利用内腔中的涂层溶液和壳侧的水流之间的浓度差来连续去除盐离子。(3) 在聚电解质浓度(PC)中,聚电解质溶液以恒定流量涂布。在这里,当离子渗透通过时,膜保留聚电解质。首先,我们评估了涂层方法生产纳滤膜的能力,这取决于所使用的涂层方法。使用PC,获得了MgCl2截留率高达79%、渗透性为30LMH/bar的膜。此外,通过添加酶来研究膜的原位功能化。在这里,利用DDS,酶被固定化,主要通过静电相互作用的吸附来实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Single‐step polyelectrolyte complex coating on hollow fibers yields nanofiltration or biocatalytic properties

The modification of membranes with polyelectrolytes via the Layer-by-Layer (LBL) method has become state of the art in recent years. It is used to fabricate nanofiltration hollow fiber membranes or to immobilize biomolecules on a membrane surface. However, it still remains a time consuming process. In contrast, this work explores a single-step membrane modification with coating solutions containing both polyanions and polycations. High salt concentration in the coating solution suppresses the complexation of the polyelectrolytes prior to the coating. Then, the controlled reduction of the salt concentration during the coating triggers the formation of a polyelectrolyte complex layer on the membrane. Three coating methods are proposed: (1) In interfacial complexation (IC), the polyelectrolyte solution coats the membrane and is subsequently precipitated by flushing with water. (2) Diffusive desalination (DDS) uses the concentration difference between the coating solution in the lumen and a water stream in the shell side to remove salt ions continuously. (3) In polyelectrolyte concentration (PC), the polyelectrolyte solution is coated at a constant flux. Here, the membrane retains the polyelectrolyte while ions permeate through. First, we evaluate the coating methods regarding their ability to produce nanofiltration membranes, which varies depending on the coating method used. With PC, membranes with up to 79% MgCl2 rejection and a permeability of 30 LMH/bar are obtained. Moreover, in-situ functionalization of the membranes is investigated by the addition of enzymes. Here, with DDS enzymes are immobilized, mostly achieved through adsorption via electrostatic interactions.

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