Tao Wu , Shiyu Zhang , Miaomiao Zhang , Mengying Long , Guangzhe Wang , Tianrun Gu , Hao Deng , Cuiting Ding , Runnan Zhang , Zhongyi Jiang
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The acid acceptor can neutralize the HCl to prevent CPIP from being protonated during the IP process, thereby facilitating the cross-linking reaction rate. The thickness of the resulting membrane decreases from 180 nm to 30 nm, accompanied by the fortification of the negative charge, an increase in cross-linking density, and a reduction in pore size. The resulting PA-AA/CPIP_1.0 membrane exhibits a water permeance of 44.6 L m<sup>−2</sup> h<sup>−1</sup> bar<sup>−1</sup>, with a significantly increased Na<sub>2</sub>SO<sub>4</sub> rejection of 98.4 % compared with 50.4 % of the PA-AA/CPIP_0 membrane fabricated without acid acceptor. This work may open a new avenue to fabricating high-performance PA membranes for nanofiltration.</p></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":null,"pages":null},"PeriodicalIF":8.4000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Acid acceptor modulated interfacial polymerization with piperazine-2-carboxylic acid as diamine monomer for ultrathin polyamide nanofiltration membrane\",\"authors\":\"Tao Wu , Shiyu Zhang , Miaomiao Zhang , Mengying Long , Guangzhe Wang , Tianrun Gu , Hao Deng , Cuiting Ding , Runnan Zhang , Zhongyi Jiang\",\"doi\":\"10.1016/j.memsci.2024.123019\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>When introducing acid groups in the diamine monomer for the fabrication of polyamide (PA) membranes through interfacial polymerization (IP), the acid groups not only reduce the diffusion flux of diamine monomer for the polymerization to prepare ultrathin membrane but also provide the negative charges on the membrane surface. 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引用次数: 0
摘要
在通过界面聚合(IP)制造聚酰胺(PA)膜的二胺单体中引入酸性基团时,酸性基团不仅能降低二胺单体在聚合过程中的扩散通量,从而制备出超薄膜,还能在膜表面提供负电荷。然而,酸性基团的引入往往会削弱二胺单体的反应活性,导致形成的 PA 膜厚而疏松,离子排斥率低。本研究提出了一种调节哌嗪-2-羧酸(CPIP)IP 过程的策略,即利用酸性接受体(NaOH)制备薄纳滤膜。酸接受体可以中和盐酸,防止 CPIP 在 IP 过程中被质子化,从而促进交联反应速率。所得膜的厚度从 180 纳米减至 30 纳米,同时负电荷增强,交联密度增加,孔径减小。所制备的 PA-AA/CPIP_1.0 膜的透水率为 44.6 L m-2 h-1 bar-1,Na2SO4 阻隔率显著提高至 98.4%,而不含酸接受体的 PA-AA/CPIP_0 膜的阻隔率仅为 50.4%。这项研究为制造用于纳滤的高性能 PA 膜开辟了一条新途径。
Acid acceptor modulated interfacial polymerization with piperazine-2-carboxylic acid as diamine monomer for ultrathin polyamide nanofiltration membrane
When introducing acid groups in the diamine monomer for the fabrication of polyamide (PA) membranes through interfacial polymerization (IP), the acid groups not only reduce the diffusion flux of diamine monomer for the polymerization to prepare ultrathin membrane but also provide the negative charges on the membrane surface. However, the introduction of acid groups often weakens the reactivity of diamine monomers, resulting in the formation of thick and loose PA membranes with low rejection of ions. This study proposes a strategy of modulating the IP process of piperazine-2-carboxylic acid (CPIP) by employing an acid acceptor (NaOH) to prepare thin nanofiltration membranes. The acid acceptor can neutralize the HCl to prevent CPIP from being protonated during the IP process, thereby facilitating the cross-linking reaction rate. The thickness of the resulting membrane decreases from 180 nm to 30 nm, accompanied by the fortification of the negative charge, an increase in cross-linking density, and a reduction in pore size. The resulting PA-AA/CPIP_1.0 membrane exhibits a water permeance of 44.6 L m−2 h−1 bar−1, with a significantly increased Na2SO4 rejection of 98.4 % compared with 50.4 % of the PA-AA/CPIP_0 membrane fabricated without acid acceptor. This work may open a new avenue to fabricating high-performance PA membranes for nanofiltration.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.