氨基连接的共价有机框架膜实现了优越的离子选择性
Rui Guo1,2, Zhiyuan Zha1,2, Jixiao Wang1,2
1School of Chemical Engineering and Technology, Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin, 300072, China.
这项研究引入了一种新的氨基联共价有机框架 (COF) 膜,用于高盐度废水的高效处理. 先进的膜实现了卓越的单价/双价盐分离,这对于水资源循环利用和零排放目标至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 高盐度废水对水资源回收和实现零排放构成全球性挑战.
- 膜技术为从-盐水中去除硫酸盐提供了一个有前途的途径,但目前的膜缺乏足够的水透性和离子选择性.
- 单价盐和双价盐的有效分离对于有效的废水处理和资源利用至关重要.
研究的目的:
- 开发一种具有增强的离子选择性和水透性的新型共价有机框架 (COF) 膜,用于高盐度废水处理.
- 为了研究一种与氨基酸结合的COF膜在分离单价盐 (NaCl) 和双价盐 (Na2SO4) 的性能.
- 评估开发的膜在废水资源利用和零排放等工业应用中的潜力.
主要方法:
- 组装一个统一的共价有机框架 (COF) 层使用1,4-甲 (TPA) -piperazine (PZ) 通过化三聚化物 (TMC).
- 制造一种与氨基结的COF膜 (sTPA-PZ),具有亚纳米尺寸的通道和7 Å的正规孔径.
- 使用混合盐溶液测试膜在水透,Na2SO4排放和Cl-/SO42-分离方面的性能.
主要成果:
- 化学拼接的TPA-PZ (sTPA-PZ) 膜显示出高水透率13.1 L m−2 h−1 bar−1.
- 达到99.1%的优异Na2SO4排斥率和66的Cl-/SO42-分离因子,用于混合盐分离.
- 对NaCl/Na2SO4混合盐溶液的单阶段处理产生了高NaCl纯度 (>95%) 和约60%的回收率.
结论:
- 氨基联COF膜在单价盐/双价盐分离中表现出色,性能优于现有的COF基膜.
- 开发的膜显示了废水资源利用和实现零排放目标的工业应用的巨大潜力.
- 这项工作为设计先进的安格斯特罗姆尺度分离膜材料提供了新的途径.
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