摘要:
高温废水处理一直是各行业水处理的难点,尤其是在受高温限制的反渗透膜水处理领域,而热稳定膜材料的研究和制备是解决这一难题的关键。首先通过界面聚合在聚砜基膜表面形成聚酰胺层,再利用膜表面残留的酰氯基团与富含羟基的α-环糊精(α-CD)进行二次界面聚合,成功在聚酰胺层上构建了基于α-CD改性的聚酯保护层,制备出一种α-CD改性聚酯/聚酰胺复合反渗透膜。得益于α-CD的耐热特性和独特的纳米空腔结构,在保证通量的条件下,有效提高了反渗透膜的耐高温性能。经过3个周期的常温-高温循环测试,复合膜对氯化钠的脱除率能够保持在99.18%~99.56%范围内,水通量随温度升高而相应提升,表明α-CD改性聚酯/聚酰胺复合反渗透膜具有优良的耐高温性能。
关键词:
聚酰胺,
α-环糊精,
聚酯,
反渗透膜,
高温稳定性
Abstract:
High temperature wastewater treatment has always been a challenge in various industries, especially in the field of reverse osmosis membranes that are limited by high temperatures. The research and preparation of thermally stable membrane materials are the key to solving this problem. Firstly, a polyamide layer was formed on the surface of the polysulfone base film through interface polymerization, and then residual acyl chloride groups on the membrane surface were used to undergo secondary interfacial polymerization with α-cyclodextrin(α-CD) rich in hydroxyl. A polyester protective layer modified with α-CD was successfully constructed on the polyamide layer, and an α-CD modified polyester/polyamide composite reverse osmosis membrane was prepared. Thanks to the heat-resistant properties and unique nano cavity structure of α-CD, the high temperature stability of reverse osmosis membranes has been effectively improved while ensuring flux. After three cycles of room temperature-high temperature cycling tests, the removal rate of the composite membrane for sodium chloride could be maintained within the range of 99.18% to 99.56%, and the water flux increased correspondingly with the increase of temperature, which indicated that the α-CD modified polyester/polyamide composite reverse osmosis membrane had excellent high temperature resistance.
Key words:
polyamide,
α-cyclodextrin,
polyester,
reverse osmosis membrane,
high temperature stability
中图分类号:
任其成, 王海涛, 刘鹏, 陈董根, 许以农, 王锡惠, 常娜. α-环糊精改性反渗透膜制备及耐高温性能研究[J]. 工业水处理, 2025, 45(10): 69-77.
Qicheng REN, Haitao WANG, Peng LIU, Donggen CHEN, Yinong XU, Xihui WANG, Na CHANG. Preparation and high temperature resistance of α-cyclodextrin modified reverse osmosis membrane[J]. Industrial Water Treatment, 2025, 45(10): 69-77.