在船闸型离子选择性渗透系统中利用锂阱LiAlFe-LDHs/MWCNTs/QCS复合膜进行锂选择性萃取

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-05-24 DOI:10.1016/j.seppur.2025.133730

Yi Wang, Huanhuan Guo, Xiaohan Xing, Can Wang, Xuefeng Zhang, Xiumin Li, Fengfeng Gao, Xiaogang Hao

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引用次数: 0

摘要

采用真空过滤法和预解吸工艺制备了锂离子空位（Li+-trap）复合膜（LiAlFe-LDHs/MWCNTs/QCS）。为了在船闸型离子选择性渗透（SL-ISP）系统中选择性提取Li+，研制了Li+捕集膜LiAlFe-LDHs/MWCNTs/QCS。在Li+陷阱LiAlFe-LDHs/MWCNTs/QCS复合膜中，LiAlFe-LDHs内的Li+陷阱是实现Li+选择性提取的关键。这种选择性是通过Li+在LiAlFe-LDHs层间结构中的Li+陷阱位点的循环插入来实现的，这一过程也促进了Cl-的渗透。SL-ISP体系进一步消除了杂质离子的干扰，有利于Li+的选择性萃取。研究发现，Li+捕集器LiAlFe-LDHs/MWCNTs/QCS复合膜在等摩尔浓度（CMg, Li = 0.05 m）下，Li+通量为0.055 mol·m−2·h−1，分离因子为8.3。此外，Li+捕集器LiAlFe-LDHs/MWCNTs/QCS复合膜在模拟盐水中表现出优异的分离性能，计算出Li+渗透通量为0.053 mol·m−2·h−1。Li+/Mg2+、Li+/K+、Li+/Na+和Li+/Ca2+的分离系数分别为91.84、69.75、81.51和17.99。因此，Li+捕集器LiAlFe-LDHs/MWCNTs/QCS复合膜可以有效地应用于SL-ISP体系中进行Li+的选择性提取。

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Lithium-selective extraction utilizing lithium-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane within the ship lock-type ion selective permeability system

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Lithium-selective extraction utilizing lithium-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane within the ship lock-type ion selective permeability system

A lithium aluminum iron layered double hydroxides/multiwalled carbon nanotubes/quaternized chitosan (LiAlFe-LDHs/MWCNTs/QCS) composite membrane with lithium-ion vacancies (Li⁺-trap) was fabricated through vacuum filtration method and pre-desorption process. The Li⁺-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane had been developed for the selective extraction of Li⁺ within the ship lock-type ion selective permeability (SL-ISP) system. In the Li⁺-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane, the Li⁺-trap within LiAlFe-LDHs was pivotal for achieving selective Li⁺ extraction. This selectivity was realized through the cyclic intercalation of Li⁺ into the Li⁺-trap sites within the interlayer structure of LiAlFe-LDHs, a process that also facilitates the permeation of Cl^-. The interference of impurity ions was further eliminated by the SL-ISP system, thus facilitating the selective extraction of Li⁺. Upon investigation, the Li⁺-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane was found to achieve a Li⁺ flux of 0.055 mol·m⁻²·h⁻¹ and a separation factor of 8.3 at an equimolar concentration (C_{Mg, Li} = 0.05 M) within the SL-ISP system. Additionally, the Li⁺-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane demonstrated excellent separation performance in simulated brine, with a calculated Li⁺ permeation flux of 0.053 mol·m⁻²·h⁻¹. The separation factors of Li⁺/Mg²⁺, Li⁺/K⁺, Li⁺/Na⁺ and Li⁺/Ca²⁺ reached values of 91.84, 69.75, 81.51 and 17.99, respectively. Therefore, the Li⁺-trap LiAlFe-LDHs/MWCNTs/QCS composite membrane could be effectively applied in the SL-ISP system for the selective extraction of Li⁺.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.