Selective Adsorption of Magnesium Using Lithium Carboxylate-Based Covalent Organic Frameworks

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2025-03-06 DOI:10.1021/acsapm.4c0408410.1021/acsapm.4c04084

Ataf Ali Altaf, Ahmadreza Khosropour, Amin Zadehnazari, Samia Kausar, Amin Zarei, Imann Mosleh and Alireza Abbaspourrad*,

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Abstract

Magnesium and lithium exhibit similar behaviors in aqueous solutions, making their separation from each other in saltlake brine challenging. Here, we report the design and synthesis of four lithium carboxylate-based covalent organic frameworks (COFs), ATSA-1 through ATSA-4, that selectively adsorb Mg²⁺ ions over Li⁺. Adsorption performance was investigated under varying initial Mg²⁺ concentrations, adsorbent dosages, and contact times. Among the COFs, ATSA-4 demonstrated the highest Mg²⁺ adsorption capacity, reaching 19 mg g^–1. Adsorption data aligned with the Langmuir isotherm model, while kinetic analysis indicated a pseudo-second-order model best described Mg²⁺ uptake. Regeneration tests revealed that hydrochloric acid at pH 3 efficiently desorbed Mg²⁺, enabling the COF reusability. Additionally, a COF-supported ultrafiltration bed yielded a Mg²⁺ separation flux of 19 g h^–1 m^–2. The ATSA-COF series further displayed a high selectivity for Mg²⁺ in mixed Mg²⁺/Li⁺ solutions.

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羧酸锂基共价有机骨架对镁的选择性吸附

镁和锂在水溶液中表现出相似的行为，这使得它们在盐湖卤水中相互分离具有挑战性。在这里，我们报道了四种基于羧酸锂的共价有机框架（COFs） ATSA-1至ATSA-4的设计和合成，它们选择性地吸附Mg2+离子而不是Li+。研究了不同初始Mg2+浓度、吸附剂用量和接触时间下的吸附性能。在COFs中，ATSA-4对Mg2+的吸附量最高，达到19 mg g-1。吸附数据符合Langmuir等温线模型，而动力学分析表明伪二阶模型最能描述Mg2+的吸收。再生试验表明，pH为3的盐酸能有效解吸Mg2+，使COF可重复使用。此外，cof负载的超滤床的Mg2+分离通量为19 g h-1 m-2。ATSA-COF系列在Mg2+/Li+混合溶液中进一步表现出对Mg2+的高选择性。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.