Highly selective lithium recovery from seawater desalination brine using Li₂TiO₃ membrane-coated capacitive deionization

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-06-26 DOI:10.1016/j.watres.2025.124113

Hanwei Yu , Chen Wang , Sherub Phuntsho , Tao He , Gayathri Naidu , Dong Suk Han , Ho Kyong Shon

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Abstract

Selective lithium (Li) recovery from seawater-based resources is challenged by low Li concentrations and the presence of competing ions such as Na⁺, K⁺, Mg²⁺, and Ca²⁺. This study presents an innovative approach by integrating capacitive deionization (CDI) with a titanium-based lithium-ion sieve (LIS) membrane-coated cathode and an anion exchange membrane (AEM)-coated anode for enhanced Li recovery from seawater desalination brine (SWDB). The cathode was fabricated using Li₂TiO₃ (LTO) adsorbent through rolling pressing and dip coating methods. Characterization confirmed the successful fabrication of the LTO membrane-coated electrode. The performance of the LTO-AEM-CDI system was evaluated using simulated SWDB through an adsorption-rinsing-desorption operational mode. The results indicated that the rinsing stage plays a crucial role in significantly enhancing Li selectivity. A 10-cycle stability test demonstrated the system's reliability, maintaining the active Li selectivity (ALS) consistently above 100 across all cycles. This research highlights the potential of combining LIS, membrane technologies, and CDI for effective Li extraction from seawater-based resources.

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利用Li₂TiO₃膜包覆电容去离子技术高选择性回收海水淡化盐水中的锂

从海水资源中选择性回收锂（Li）受到低锂浓度和Na +、K +、Mg 2 +和Ca 2 +等竞争离子的挑战。本研究提出了一种创新的方法，将电容去离子（CDI）与钛基锂离子筛（LIS）膜涂层阴极和阴离子交换膜（AEM）涂层阳极相结合，以提高海水淡化盐水（SWDB）中锂的回收率。以Li2TiO3 （LTO）吸附剂为材料，采用滚压和浸涂法制备阴极。表征证实了LTO膜包覆电极的成功制备。通过吸附-漂洗-解吸操作模式，对LTO-AEM-CDI系统的性能进行了模拟SWDB评估。结果表明，漂洗阶段对提高锂选择性起着至关重要的作用。10个循环的稳定性测试证明了系统的可靠性，在所有循环中，活性锂选择性（ALS）始终保持在100以上。本研究强调了结合LIS、膜技术和CDI技术从海水资源中有效提取Li的潜力。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.