Bio-inspired polydopamine nanofiltration membranes modulated by spiro-piperazine

Advanced Membranes Pub Date : 2023-01-01 DOI:10.1016/j.advmem.2022.100059

Xufei Liu , Huawen Peng , Jing Lu , Yanli Ji , Shaoping Li , Jiayin Yuan , Qiang Zhao , Congjie Gao

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引用次数: 3

Abstract

Polydopamine (PDA) depositions, inspired by mussel foot adhesive proteins, represent a versatile method for preparing separation membranes. However, PDA-based nanofiltration membranes are limited by the long preparation time and moderate flux. This work modulated PDA deposition processes with a spiro-piperazine (SPIP) molecule containing two secondary amine groups and a quaternary ammonium salt. The SPIP could be covalently inserted into PDA coating structures via Michael addition reaction to accelerate the deposition process of PDA and reduce its aggregation. In addition, the rigid and spiro configuration of SPIP molecules provides higher fractional free volume and leads to looser and more uniform structures in the PDA coating. As such, water permeance of PDA/SPIP membranes is 73 L m⁻² h⁻¹ bar⁻¹, 4.6 times improved compared with PDA control membranes, while the dye rejection (>99% for Congo red) is maintained high. These results demonstrate that SPIP is an effective molecule for the structure and performance engineering of mussel-inspired PDA nanofiltration membranes.

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螺哌嗪修饰聚多巴胺生物纳滤膜

聚多巴胺（PDA）沉积受到贻贝足粘附蛋白的启发，是制备分离膜的一种通用方法。然而，基于PDA的纳滤膜由于制备时间长和流量适中而受到限制。这项工作用含有两个仲胺基团和一种季铵盐的螺哌嗪（SPIP）分子调节PDA沉积过程。SPIP可以通过Michael加成反应共价插入PDA涂层结构中，以加速PDA的沉积过程并减少其聚集。此外，SPIP分子的刚性和螺环构型提供了更高的自由体积分数，并导致PDA涂层中的结构更疏松、更均匀。因此，PDA/SPIP膜的透水性为73Lm−2h−1 bar−1，与PDA对照膜相比提高了4.6倍，同时染料截留率（刚果红＞99%）保持较高。这些结果表明，SPIP是一种有效的分子，可用于贻贝启发的PDA纳滤膜的结构和性能工程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Membranes

CiteScore

8.50

自引率

0.00%

发文量