单乙醇胺和二氧化碳对聚酰胺反渗透复合膜的影响
作者:刘伟良,马晓华
单位: 化学工程联合国家重点实验室,华东理工大学化学工程研究所膜科学与工程研发中心,上海 200237
关键词: 膜;二氧化碳;界面聚合;酸吸收剂;单乙醇胺;脱盐
分类号: TQ 316.4
出版年,卷(期):页码: 2020,40(6):1-6

摘要:

聚酰胺反渗透复合膜占据了反渗透膜的主要市场,其分离性能主要由聚酰胺分离层的结构和性能决定,是目前研究的热点。采用纳米发泡的方法调控聚酰胺分离层的微纳结构,通过在水相中加入乙醇胺调控二氧化碳的溶解度,借以调控聚酰胺分离层的形貌,考察单乙醇胺用量对聚酰胺反渗透复合膜结构和性能的影响。采用扫描电子显微镜、动态接触角测试仪、傅里叶红外光谱和过滤实验对聚酰胺反渗透复合膜结构和性能进行表征。结果表明一定量乙醇胺的加入可以有效地改变膜的表面形貌,影响其表面性质,1%的添加量下可使膜的通量提升31.5%。
 Polyamide (PA) reverse osmosis (RO) thin-film composite (TFC) membranes dominate the market of RO membrane. The separation performance of the RO TFC membrane is mainly determined by the structure and property of the PA separation layer. In this paper, a nanofoaming method was used to adjust the micro-nano structure of the PA separation layer. By adding monoethanolamine (MEA) to the aqueous phase to adjust the solubility of carbon dioxide, the morphology of the PA separation layer was adjusted. The effect of the amount of MEA on the structure and performance of RO membrane was investigated. The surface morphology and separation performance of the RO membrane were characterized by scanning electron microscope, dynamic contact angle tester, fourier infrared spectroscopy and filtering experiments. The results showed that the addition of a certain amount of MEA can effectively change the surface morphology of the membrane, affect its surface properties and improve the separation performance.


基金项目:
国家自然科学基金项目(21978081

作者简介:
刘伟良(1995-),男,上海,硕士研究生,研究方向:反渗透膜的制备与改性,E-mail:bc1995lwl@foxmail.com

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