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中间层构建及其反渗透复合膜性能的探讨

作者：李文远¹，吕晓龙¹，²，任凯¹，谷杰¹，张慧莹¹

单位： 1. 省部共建分离膜与膜过程国家重点实验室，材料科学与工程学院，生物化工研究所，天津工业大学 2. 膜材料与膜应用国家重点实验室，天津膜天膜科技股份有限公司

关键词：反渗透膜；界面聚合；膜通量；中间层

DOI号： 10.16159/j.cnki.issn1007-8924.2024.05.018

分类号： TQ028.8

出版年,卷(期):页码： 2024,44(5):150-155

摘要：

自制了聚氯乙烯（PVC）超滤基膜，通过多元胺（二乙烯三胺-DETA和哌嗪-PIP）和多元酸（衣康酸-IA、马来酸酐-MAH和柠檬酸-CA）反应形成了基膜表面中间层，采用间苯二胺（MPD）和均苯三甲酰氯（TMC）界面聚合（IP）制备了反渗透（RO）复合膜，讨论了多元胺/多元酸种类（DETA/CA,DETA/MAH,DETA/IA,PIP/IA）、反应次数等对中间层性能和RO膜性能的影响.结果表明，当50 ℃时，利用3 mol/L二乙烯三胺和0.5 mol/L衣康酸在基膜表面反应4次的中间层所制备的RO复合膜，在2.0 MPa压力下对质量浓度1 800 mg/L的氯化钠水溶液脱盐率为97.58%，其水通量为34.8 L/(m2·h·MPa)，与空白对照RO膜相比水通量提升41.3%，因此，这种中间层构建的方法为高通量RO复合膜的制备提供了理论依据.

In this paper, polyvinyl chloride (PVC) ultrafiltration base membrane was prepared, and through the reaction of polyamines (diethylenetriamine-DETA and piperazine-PIP) and polyacids (itaconic acid-IA, maleic anhydride-MAH and citric acid-CA), intermediate layer of base membrane surface was formed, reverse osmosis (RO) composite membrane was prepared by interfacial polymerization (IP) of m-phenylenediamine (MPD) and trimesoyl chloride (TMC) and the effects of DETA/IA reaction times of polyamines/polyacids (DETA/CA, DETA/MAH, DETA/IA and PIP/IA) on the properties of interlayer and RO film were discussed. It is shown from the result that, at 50 ℃, for the RO composite membrane prepared by 3 mol/L diethylenetriamine and 0.5 mol/L itaconic acid through reaction for 4 times on the surface of the base membrane, the desalination rate for 1 800 mg/L sodium chloride water solution was 97.58% at 2.0 MPa pressure and water flux was 34.8 L/(m2·h·MPa). Compared with the blank control RO membrane, the water flux increased by 41.3%. Therefore, the method of constructing intermediate layer provides a theoretical basis for the preparation of high-flux RO composite membranes.

基金项目：

国家重点研发计划( 2023YFB3810500)

作者简介：

李文远(1998-),男，天津市人，硕士生，研究方向为分离膜制备与应用.*通讯作者,E-mail：13920286131@163.com

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