Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 20 2 2024 05 31 Lithium Extraction by Metal Organic Framework-Based Adsorbent (MnO2@Co/Zn ZIF) from Aqueous Solutions 129 142 715069 10.22034/ijnn.2024.2022011.2474 EN Saman Mesvari Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran Mojtaba Shariaty-Niassar Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran 0000-0002-4477-8397 Javad Karimi-Sabet Material and Nuclear Fuel Research School (MNFRS), Nuclear Science and Technology Research Institute, Tehran, Iran Abolfazl Dastbaz Material and Nuclear Fuel Research School (MNFRS), Nuclear Science and Technology Research Institute, Tehran, Iran Journal Article 2024 02 03 <em>   Lithium is one of the critical elements in the development of industries, and its amount in seawater and brines (2.5×10¹¹ tonnes) is estimated to be about 16,000 times more than land-based resources. However, the low lithium concentration in seawater (0.17 ppm) requires an efficient and selective method of lithium extraction. Although metal-organic frameworks (MOFs) are widely utilized for removing or extracting heavy metals from seawater, they have not been extensively employed for lithium extraction from such sources. This research used a bimetallic MOF-based adsorbent (MnO₂@Co/Zn ZIF) to extract lithium ions from the solution. The effects of Li⁺ concentration and contact time on adsorption were investigated. Based on kinetic studies, the pseudo-second-order model adequately represents the kinetic behavior of lithium adsorption. The thermodynamic study demonstrated lithium adsorption with MnO₂@Co/Zn ZIF is endothermic, spontaneous, and physisorption. The adsorption process fitted well with the Freundlich isotherm (R²=0.994), and this isotherm showed the maximum adsorption capacity at room temperature to be 71.43 mg/g. The desorption process was carried out with an HCl solution and showed that MnO₂@Co/Zn ZIF has excellent desorption ability. In addition, it was demonstrated that the adsorbent could be used for lithium adsorption after three cycles of regeneration. Moreover, MnO₂@Co/Zn ZIF is a viable candidate for recovering large amounts of lithium ions from solutions, based on the results.</em> https://www.ijnnonline.net/article_715069_ceed56e4dac837ce464a644f4c6801e8.pdf