多羟基单体调控分离层结构制备高性能净水用纳滤膜  

Polyhydroxy monomers modulate the structure of the separation layer to prepare high-performance nanofiltration membranes for water purification

作　　者：鲁艺文 吕晓龙[1,2] 任凯 陈向上 张慧莹 刘慧丽 王晨宇 LU Yiwen;LYU Xiaolong;REN Kai;CHEN Xiangshang;ZHANG Huiying;LIU Huili;WANG Chenyu(State Key Laboratory of Separation Membrane and Membrane Process,School of Material Science and Engineering,Institute of Biological and Chemical Engineering,Tiangong University,Tianjin 300387,China;State Key Laboratory of Membrane Materials and Membrane Applications,Tianjin Membrane Technology Co.,Ltd.,Tianjin 300457,China)

机构地区：[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,天津300387 [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,天津300457

出　　处：《膜科学与技术》2024年第5期108-116,共9页Membrane Science and Technology

基　　金：国家重点研发计划“高端功能与智能材料”重点专项(2023YFB3810500)。

摘　　要：为了制备高效净化水中微污染物的纳滤膜,在哌嗪(PIP)水相溶液中混入小分子的多羟基第二单体双(2-羟乙基)氨基(三羟甲基)甲烷(BIS-TRIS),两者同时与均苯三甲酰氯(TMC)发生聚合反应,利用BIS-TRIS的羟基与PIP的氨基产生竞争作用来调控纳滤膜的分离层结构,制备净水用纳滤膜.采用傅里叶红外光谱与Zeta电位研究了膜的化学结构及表面荷电性,并对膜的分离性能与抗污染性能进行了表征.结果表明,与纯PIP和TMC制备的聚酰胺膜相比,BIS-TRIS的加入将膜孔径分布从0.3~0.9 nm提升至0.4~1.0 nm,成膜截留分子量从223提高到267,分离层厚度由135 nm减小到115 nm,渗透通量从93.6 L/(m^(2)·h·MPa)增加为220 L/(m^(2)·h·MPa),Na_(2)SO_(4)截留率由最初的95.6%提升至98%,盐酸四环素截留率由94%提升至98.4%,并且膜的抗污染性能进一步得到改善.本研究提出利用水相溶液中羟基、氨基与TMC的竞争交联作用来调控分离层结构,为高效去除水中微污染物的纳滤膜制备提供了简便的策略.In order to prepare a nanofiltration membrane for efficient purification of micropollutants in water,in this study,a small molecule of polyhydroxyl second monomer bis(2-ydroxyethyl)amino(trimethyl)methane(BIS-TRIS)was mixed into piperazine(PIP)aqueous solution,and the two were polymerized with homobenzesulfyl chloride(TMC)at the same time.Fourier transform infrared spectroscopy and zeta potential were used to study the chemical structure and surface chargeability of the membrane,and the separation performance and anti-fouling performance of the membrane were characterized.The results showed that compared with the polyamide membranes prepared by pure PIP and TMC,the addition of BIS-TRIS increased the pore size distribution of the membrane from 0.3~0.9 nm to 0.4~1.0 nm,the molecular weight cut-off of the film from 223 to 267,and the permeation flux from 93.6 to 220 L/(m^(2)·h·MPa),the rejection rate of Na_(2)SO_(4) increased from 95.6%to 98%,and the rejection rate of tetracycline hydrochloride increased from 94%to 98.4%,and the anti-fouling performance of the membrane was further improved.In this study,it was proposed to use the competitive cross-linking of hydroxyl groups,amino groups and TMCs in the aqueous solution to regulate the structure of the separation layer,which provided a convenient strategy for the preparation of nanofiltration membranes for the efficient removal of micropollutants in water.

关 键 词：纳滤 BIS-TRIS 饮用水处理 去除微污染物 调控膜孔径 

分 类 号：TQ028.8[化学工程]