利用乙烯醇-乙烯胺共聚物制备交联可控的耐酸渗透蒸发脱盐复合膜
Controllable cross-linking of VA-co-VAm composite membrane for pervaporation desalination under acidic conditions
付佳雯 1郝妙莉 1董晨曦 2何欣平 1吴东云 1伊春海1
作者信息
- 1. 西安交通大学 化学工程与技术学院,陕西 西安 710049
- 2. 陕西延长石油(集团)有限责任公司研究院,陕西 西安 710065
- 折叠
摘要
为了制备交联可控的耐酸脱盐膜,合成了同时含有羟基和氨基的乙烯醇-乙烯胺共聚物(VA-co-VAm),并基于酸性条件下羟基可以与醛发生缩醛反应的特性制备一系列交联可控的渗透蒸发脱盐膜.对聚合物材料和复合膜进行表征测试,研究聚合物组成、进料液 pH 等因素对脱盐性能的影响.结果表明,复合膜在酸性条件下表现出良好的脱盐性能,在 60℃下处理质量浓度为 35 g·L-1 的NaCl溶液(pH=1),复合膜水通量超过 12 kg·m-2·h-1,盐截留率>99.95％.基于以上结果,所制备的膜为酸性条件下的高浓盐水脱盐处理提供了新的思路.
Abstract
In order to prepare desalination membranes with controllable cross-linking degree and acid resistance,a vinyl alcohol-vinylamine copolymer(VA-co-VAm)containing both amino and hydroxyl groups was synthesized.The cross-linked membrane was prepared using glutaraldehyde as a cross-linking agent under acidic conditions.Cross-linking degree can be carefully controlled based on the reaction between glutaraldehyde and hydroxyl groups under acidic conditions.The polymer materials and composite membranes were characterized,and the effects of polymer composition,pH of feed solution,and other factors on membrane desalination performance were studied.The results show that the composite membrane exhibits good performance under acidic conditions.Specifically,the water flux of composite membrane exceeded 12 kg·m-2·h-1 with salt rejection over 99.95％when treating a 35 g·L-1 NaCl solution(pH=1)at 60℃.The prepared membrane offers a promising platform for desalination treatment of high salt concentrated water under acidic conditions.
关键词
渗透蒸发/脱盐/聚合物/耐酸膜/可控交联Key words
pervaporation/desalination/polymer/acid resistant membrane/controllable cross-linking引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据