Preparation of hydrophilic Cr-doped LiTi2(PO4)3 ion sieves with expanded cell structure for enhanced lithium extraction

IF 8.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2024-11-28 DOI:10.1016/j.desal.2024.118354

Mingzhu Li, Xin Shen, Xu Yang, Zhijun Xu, Feng Xue, Shengui Ju

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引用次数: 0

Abstract

Phosphate-based HTi₂(PO₄)₃ was a novel lithium ion with a NASICON network structure. In this work, Cr doped was used to improve the adsorption performance by expanding the Li⁺ transport channel and increasing the hydrophilicity of the adsorbent. The crystal structure of Cr-LTPO-0.5 was characterized by XRD, XPS, Contact angle and FT-IR analysis, and the morphology of Cr-LTPO-0.5 was analyzed by SEM and HR-TEM. Cr-HTPO-0.5 was obtained after acid washing of Cr-LTPO-0.5. The adsorption of Li⁺ on Cr-HTPO-0.5 was consistent with the Langmuir isothermal model and pseudo-2nd-order kinetic model, in which the adsorption was endothermic and spontaneous process. The structure and adsorption energy of Li⁺ on Cr-HTPO-0.5 were calculated by the density function theory (DFT) to assess the feasibility of lithium uptake. Cr-HTPO-0.5 showed remarkable selectivity for Li⁺ on heteroatoms in artificial brines. These results made Cr-HTPO-0.5 as a highly promising candidate for applications in Li⁺ recovery.

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扩孔结构的亲水cr掺杂LiTi2(PO4)3离子筛的制备及锂萃取性能研究

磷酸基HTi2(PO4)3是一种具有NASICON网络结构的新型锂离子。在本研究中，Cr掺杂通过扩大Li+的传递通道和增加吸附剂的亲水性来改善吸附性能。采用XRD、XPS、接触角和FT-IR分析表征了Cr-LTPO-0.5的晶体结构，并采用SEM和HR-TEM分析了Cr-LTPO-0.5的形貌。将Cr-LTPO-0.5酸洗后得到Cr-HTPO-0.5。Cr-HTPO-0.5对Li+的吸附符合Langmuir等温模型和拟二级动力学模型，吸附过程为吸热自发过程。利用密度泛函理论（DFT）计算了Li+在Cr-HTPO-0.5上的结构和吸附能，以评估锂吸附的可行性。Cr-HTPO-0.5对人工盐水中的杂原子Li+具有显著的选择性。这些结果使得Cr-HTPO-0.5在Li+回收中具有很高的应用前景。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.