Ultrathin sulfonated mesoporous interlayer facilitates to prepare highly-permeable polyamide nanofiltration membranes
Ultrathin sulfonated mesoporous interlayer facilitates to prepare highly-permeable polyamide nanofiltration membranes
复制标题
超薄磺化介孔夹层有利于制备高渗透聚酰胺纳滤膜
DOI：
10.1016/j.memsci.2022.120507
复制
发表时间：
2022-03-29
影响因子：
9.5
通讯作者：
Liu, Qinglin
中科院分区：
文献类型：
--
作者：
Deng, Miao;Pei, Tengfei;Liu, Qinglin
高渗透性纳滤膜（NF）的强烈需求，并已成为越来越重要的水处理和净化的关注。本文提出了一种通过传统的界面聚合（IP）工艺制备高渗透性聚酰胺（PA）纳滤膜的通用方法，该方法由磺化介孔夹层促进。制备了一系列厚度为110-250 nm、截留值约为12 nm的中间层，并将其用于制备由哌嗪（PIP）和1，3，5-苯并三甲酰氯（TMC）组成的PA纳滤膜。考察了膜层厚度、单体浓度等因素对膜制备的影响。中间层上的亚硫酸根基团极大地促进了PIP的吸附，从而增加了PIP在中间层中的储存，导致在低单体浓度下形成无缺陷的10-50 nm厚的PA膜。PA层的厚度和表面粗糙度随着中间层厚度的增加而增加。通常，40 nm厚的PA膜具有高达36.3 L m（-2）h（-1）bar（-1）的纯水渗透率，Na 2SO 4截留率为98.5%。该方法在水处理、化工分离等领域具有广泛的应用前景。
Highly-permeable nanofiltration (NF) membranes are strongly required and have become more crucial with increasing concerns in water treatment and purification. Herein a versatile approach is developed to prepare a highly-permeable polyamide (PA) NF membrane via the traditional interfacial polymerization (IP) process facilitated by an ultrathin sulfonated mesoporous interlayer. A series of the interlayers with a thickness of 110-250 nm and a cut-off around 12 nm is prepared and employed to prepare the PA NF membrane from piperazine (PIP) and 1, 3, 5-benzotriformyl chloride (TMC). Influence factors on the membrane preparation including the interlayer thickness and monomer concentrations are investigated in detail. Sulfonic groups on the interlayer greatly facilitate the PIP adsorption and thus increase the PIP storage in the interlayer, resulting in the formation of a defect-free, 10-50 nm-thick PA membrane at a low monomer concentration. The thickness and surface roughness of PA layer increase with the interlayer thickness simultaneously. Typically, the 40 nm-thick PA membrane has a pure water permeance of high to 36.3 L m(-2) h(-1 )bar(- 1) with a Na2SO4 rejection of 98.5%. The newly developed approach has a wide application in the preparation of highly-permeable PA membranes for various fields including water treatment and chemical separation.