带正电荷的聚胺纳米过膜用于精确的离子离子分离
Zhenyi Zhao1, Nanxi Di1, Zhiyuan Zha1
1School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, P. R. China.
ACS applied materials & interfaces
|October 5, 2023
概括
这项研究引入了一种新的正电荷纳米过膜,用于精确的离子分离. 新的聚胺基膜在分离和离子方面具有很高的选择性,这对于各种工业应用至关重要.
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:
- 传统的纳米过 (NF) 膜在离子分离方面面临限制,原因是表面负电荷.
- 实现高离子离子选择性对于-分离和水软化等应用至关重要.
研究的目的:
- 开发一种先进的,带正电荷的纳米过膜,用于精确的离子分离.
- 为了克服传统的聚胺基膜的性能限制.
主要方法:
- 聚乙胺 (PEI) 和1,3,5-三甲 (TBB) 的界面聚合,以创建PEI-TBB选择性层.
- 复合膜的制造具有超薄厚度 (~95 nm) 和 6.5 Å 的孔径.
- 表面电荷的表征 (pH 7时泽塔电位+20.9 mV) 和分离性能.
主要成果:
- PEI-TBB膜的水透率为4.2 L·m−2·h−1·bar−1.1. 这是一个非常好的结果.
- 对各种双价盐的排斥率达到了>90%,对于NaCl/MgCl2和LiCl/MgCl2.2,分离因子达到了>15.
- 一个三阶段的NF工艺将Mg2+/Li+质量比从50降至0.11,总分离因子为455.
结论:
- 开发的基于聚胺的NF膜提供了精确的离子离子分离能力.
- 在连续过和高压下表现出卓越的运行稳定性.
- 显示了需要选择性离子去除和回收的应用的巨大潜力.
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