膜科学与技术

哌嗪聚酰胺纳滤膜的氯氧化特性及机理

作者：李梦菲，杨少霞，杨宏伟，林小锋，王小??

单位： 1. 华北电力大学水利与水电工程学院，北京 102206；2. 清华大学环境学院，环境模拟与污染控制国家重点联合实验室，北京 100084；3. 清华苏州环境创新研究院，苏州 215163；4. 苏州普希环保科技有限公司，苏州 215124

关键词：哌嗪聚酰胺纳滤膜；游离氯；膜性能；红外光谱；氯化机理

DOI号：

分类号：

出版年,卷(期):页码： 2023,43(1):27-36

摘要：

聚酰胺纳滤膜广泛应用于水处理领域，对含氯消毒剂比较稳定，但仍有报道聚哌嗪酰胺纳滤膜与水中的游离氯发生反应。因此，了解哌嗪聚酰胺纳滤膜的氯化机理，对膜的耐久性和耐氯膜的开发具有重要意义。系统研究了商品哌嗪聚酰胺纳滤膜在氯氧化过程中膜性质和性能的变化，分析了酸性和碱性条件下氯化对膜的影响。通过对剥离得到的聚酰胺活性层进行红外光谱表征和X射线光电子能谱分析，探究膜的氯化机理。结果表明：酸性条件下，N-氯化、水解和环氯化是主要的氯破坏降解机制；碱性条件下，N-氯化和氯化促进水解是主要发生的过程。由于酸性条件下主要活性氯物质HClO的氧化能力高于碱性条件下的ClO-，所以酸性条件下氯氧化导致膜结构被更严重破坏；碱性条件下更有利于膜的水解；在2种氯化条件下，随着总游离氯剂量的增加水渗透系数增大，并且中性有机化合物截留率下降，膜性能呈下降趋势。

Polyamide nanofiltration membrane is widely used in the field of water treatment, and it is relatively stable to chlorine containing disinfectants. However, it is still reported that the polypiperazine amide nanofiltration membrane reacts with free chlorine in water. Therefore, understanding the chlorination mechanism of piperazine polyamide nanofiltration membrane is of great significance to the durability of membrane and the development of chlorine-resistant membrane. In this work, the changes of performance and properties of commercial piperazine polyamide nanofiltration membrane during chlorine oxidation were systematically studied, and the effects of chlorination on the membrane under acidic and alkaline conditions were analyzed. The chlorination mechanism of the membrane was explored by ATR-FTIR characterization and XPS analysis of the stripped polyamide active layer. The results showed that under alkaline conditions, N-chlorination, hydrolysis and ring-chlorination were the main chlorination degradation mechanisms. Under alkaline conditions, N-chlorination and chlorination promoting hydrolysis are the main processes. Because the oxidation capacity of the main active chlorine HClO under acidic conditions is higher than that of ClO- under alkaline conditions, the chlorine oxidation in acid condition leads to more serious degradation to the membrane structure. Alkaline condition contribute to hydrolysis of membrane. Under the two chlorination conditions, with the increase of CT value, the water permeability increased and the rejection of neutral organic compounds decreased, indicates a declining trend in membrane performance.

基金项目：

作者简介：

李梦菲（1996-），女，天津，硕士，主要研究方向为纳滤膜的氯氧化降解机理，E-mail：1308741138@qq.com

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