一个空洞的纤维支持的离子液体膜接触器,用于从高/比盐中持续提取
Bo Dong1, Junyuan Hua1, Jintao He1
1State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, PR China; School of Materials Science and Engineering, Tiangong University, Tianjin 300387, PR China.
Water research
|March 11, 2025
概括
这项研究开发了一种支持的离子液体膜 (SILM) 接触器,使用功能化的空心纤维膜来有效地从低度盐湖盐水中提取. 创新的设计显著提高了的回收和选择性,即使的度很高.
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:
- 从盐湖盐水中提取是具有挑战性的,因为的度低,含量高.
- (Mg2+) 和 (Li+) 离子具有相似的物理和化学特性,这使分离变得复杂.
研究的目的:
- 开发一种高效的支持离子液体膜 (SILM) 接触器,用于从模拟的盐湖盐水中选择性提取.
- 研究用14-皇冠-4以太 (14C4PI) 功能化的空洞纤维 (HF) 膜的性能,以提高回收.
主要方法:
- 使用非溶剂诱导的相分离制造14-皇冠-4以太功能化聚胺 (14C4PI) 空心纤维膜.
- 用离子液相 (trifluoromethylsulfonyl) imide - NaNTf2) 浸泡多孔膜,以创建SILM接触器.
- 使用模拟盐水 (料) 和盐酸 (脱落) 的SILMs接触器连续运行120小时.
主要成果:
- 高频膜的孔径为20.1nm,孔径为73.6%,破裂强度为5.64MPa.
- 在Mg/Li质量比为3.5和1.5%的膜包装时,Li+质量转移率为0.468μm/s,分离因子 (SF_Li-Mg) 为15.86.
- 将Mg/Li比率提高到35和包装密度提高到15%,提高了Li+质量转移率到0.623μm/s和SF_Li-Mg到30.8,证明了良好的稳定性和效率.
结论:
- 具有高密度高频膜的SILMs接触器提供了卓越的操作稳定性和高效的提取.
- 皇冠乙醇组对Li+的特定识别以及离子运输和脱水中离子液体的作用有助于高选择性.
- 这种方法为从盐湖中提取提供了一种有希望的,连续的和可扩展的方法,防止了离子体的损失.
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