Desalination最新文献

{"title":"Efficient lithium extraction from salt lakes brine via regulating the electric double-layer interface of high-loading film electrodes with CMCLi","authors":"Yawen Gao ,&nbsp;Luxiang Ma ,&nbsp;Xin Zeng ,&nbsp;Zhixiang Li ,&nbsp;Ting Li ,&nbsp;Chunxi Hai ,&nbsp;Tiandong Chen ,&nbsp;Yanxia Sun ,&nbsp;Shengde Dong ,&nbsp;Xin He ,&nbsp;Qi Xu ,&nbsp;Xiaowang Wu ,&nbsp;Hongli Su ,&nbsp;Yuan Zhou","doi":"10.1016/j.desal.2025.119395","DOIUrl":"10.1016/j.desal.2025.119395","url":null,"abstract":"<div><div>In response to the problems of large interfacial diffusion resistance and low lithium extraction efficiency in traditional high-loading film electrodes during lithium extraction from salt lakes by the electrochemical de-intercalation method, this paper presents an interfacial engineering strategy based on the carboxymethyl cellulose lithium (CMC<img>Li) binder. By modulating the structure of the inner Helmholtz plane (IHP) of the electrical double layer and enlarging the effective specific surface area, the migration rate of Li⁺ and the lithium extraction efficiency are remarkably enhanced.</div><div>In this study, a CMC-Li composite electrode sheet was prepared using Spent LiFePO₄ as the raw material. It was demonstrated that the carboxyl (-COOH) and hydroxyl (-OH) functional groups of CMC-Li can be directionally adsorbed on the electrode surface. This adsorption event reconstructs the IHP-layer structure, reduces the solvation energy barrier of Li⁺, and increases the effective specific surface area of the film electrode. As a result, the contact angle decreased from 130.01° to 55.17°. Furthermore, in the CMC-Li system, the lithium extraction rate in simulated brine increased from 0.33 mg·g⁻¹·min⁻¹ to 0.69 mg·g⁻¹·min⁻¹, while the energy consumption decreased by a factor of 3. In the West Taijinar brine, the lithium extraction capacity reached 23.01 mg·g⁻¹ with a concurrent dramatic reduction in the Mg/Li ratio from 141 to 0.42. These results indicate that the CMC-Li system exhibits excellent lithium extraction performance and high selectivity. Overall, this study proposes a groundbreaking interfacial design concept that achieves both high efficiency and sustainability for lithium extraction from salt lake brines.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119395"},"PeriodicalIF":9.8,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-purity rubidium salts production from high-alkalinity and high-impurity solution via solvent extraction","authors":"Hui Yang ,&nbsp;Baozhong Ma ,&nbsp;Weiwei Zhang ,&nbsp;Shuyang Shi ,&nbsp;Yubo Liu ,&nbsp;Chengyan Wang","doi":"10.1016/j.desal.2025.119393","DOIUrl":"10.1016/j.desal.2025.119393","url":null,"abstract":"<div><div>Rubidium and its compounds are widely utilized in advanced technologies. Alkaline leaching is an effective approach for rubidium extraction from ores. However, the leachate is characterized by high alkalinity and potassium concentrations, which complicates the recovery of rubidium. This study utilizes t-BAMBP as an extractant to achieve efficient extraction and separation of rubidium from alkaline leachates, ultimately yielding high-purity rubidium salt products. Firstly, key parameters including diluent type, NaOH concentration, t-BAMBP concentration, mixing time, and phase ratio were systematically optimized. A four-stage countercurrent extraction validation achieved 99.3 % Rb extraction, with residual Rb concentration of 0.002 g/L in the raffinate. ¹H NMR and FT-IR analyses revealed that the extraction mechanism was cation exchange between Rb⁺ and H⁺ on the phenolic hydroxyl group in t-BAMBP. Subsequently, HCl was utilized as both the scrubbing and stripping agent. After a nine-stage countercurrent scrubbing simulation, the potassium concentration in the loaded organic phase decreased to 0.004 g/L, achieving an efficient separation of rubidium and potassium. Ultimately, high-purity RbCl and Rb₂CO₃ were synthesized, both meeting the purity requirement of 99.5 %.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119393"},"PeriodicalIF":9.8,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A customizable woven asymmetric fabric for efficient synergistic water-electricity coproduction from saltwater","authors":"Luxin Li ,&nbsp;Jiansong Luo ,&nbsp;Wenxi Liao ,&nbsp;Jiajia Deng ,&nbsp;Ting Wang ,&nbsp;Yanyan Huang ,&nbsp;Jianming Deng ,&nbsp;Huang Zhou ,&nbsp;Yuxin Yang","doi":"10.1016/j.desal.2025.119380","DOIUrl":"10.1016/j.desal.2025.119380","url":null,"abstract":"<div><div>Water and energy are indispensable pillars of human civilization, yet both face mounting challenges due to population growth, climate change, and environmental degradation. Enhancing the efficiency of water and energy systems and reducing their environmental impact are thus critical to achieving a low-carbon, water-secure future. This study introduces a novel, scalable and adjustable water-electricity coproduction fabric (PP-WECF) developed via an accessible shuttle-flying weaving technique. The PP-WECF integrates PEDOT:PSS fibers, which serve as a transpiration-driven electrokinetic power generator, with hydrophilic fibers that channel water, and PANI fibers that enable solar-driven steam generation. The integration of PEDOT:PSS fibers and PANI fibers for PP-WECF facilitates sustainable operation and synergistic energy utilization. Furthermore, our results demonstrate that solar illumination of 1 kW·m⁻², the PP-WECF shows an efficient, self-operating, and sustainable output of 1.1 V, 116.0 μA, and 1.6 kg·m⁻²·h⁻¹ in 3.5 wt% NaCl solution. The scalable, prolonged, and adaptable outdoor operation throughout the daytime ensures the clean production of electricity and freshwater.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119380"},"PeriodicalIF":9.8,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solar-driven polypyrrole-decorated polyester filter cotton for efficient desalination and zero liquid discharge","authors":"Renpan Xing ,&nbsp;Xin Zhong ,&nbsp;Jing Wu ,&nbsp;Zijun Zhang ,&nbsp;Hui Huang ,&nbsp;Weizhan Zhong ,&nbsp;Ming Li ,&nbsp;Weiming Wang ,&nbsp;Jun Xiong","doi":"10.1016/j.desal.2025.119391","DOIUrl":"10.1016/j.desal.2025.119391","url":null,"abstract":"<div><div>Interfacial solar evaporation technology (ISET) holds significant promise for mitigating freshwater scarcity through solar-driven desalination. However, the advancement of solar evaporators that employ straightforward methods to enhance the evaporation rate (ER), improve salt resistance, and facilitate the collection of salt crystals poses a considerable challenge for ISET. In this study, we developed a photothermal material (PTM) named polypyrrole-polyester filter cotton (PPy-PFC), achieved by coating polypyrrole (PPy) onto polyester filter cotton (PFC) using a simple solution immersion technique. The PPy-PFC effectively reduces the enthalpy of water evaporation, resulting in an impressive ER of 2.44 kg m⁻² h⁻¹ under 1-solar intensity. The polyester fiber bundle (PFB) incorporates vertical water supply channels and acts as a water pump. When multiple PFBs are employed to deliver water to the PPy-PFC, it can consistently evaporate 20 wt% saltwater with an ER of 1.95 kg m⁻² h⁻¹. This remarkable salt resistance performance is attributed to the ample water supply delivered by the multiple PFBs, which facilitates the diffusion backflow of salt ions. Additionally, by positioning a single PFB at the center of the PPy-PFC, a unidirectional saltwater-flowing evaporator is constructed. Crystallized salt forms around the single PFB with a radius of 1.5 cm, achieving zero liquid discharge (ZLD). This study presents a novel strategy for designing solar evaporators that improve ER by reducing the enthalpy of water evaporation, enhancing salt resistance through sufficient water supply, and enabling the collection of salt crystals via the establishment of a unidirectional saltwater-flowing channel.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119391"},"PeriodicalIF":9.8,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-efficiency lithium recovery from desalination brine via MnAl layered double hydroxide","authors":"Mohammed Abujayyab ,&nbsp;Shadi W. Hasan ,&nbsp;Hassan A. Arafat ,&nbsp;Fawzi Banat","doi":"10.1016/j.desal.2025.119376","DOIUrl":"10.1016/j.desal.2025.119376","url":null,"abstract":"<div><div>The increasing global population necessitates the exploration and adoption of environmentally friendly extraction methods and alternative sources to meet the growing demand for lithium (Li). Adsorption offers high selectivity for Li and has emerged as a promising and cost-effective alternative. However, current methods utilizing manganese- and titanium-based adsorbents present environmental risks and exhibit instability under acidic conditions. Layered double hydroxides (LDHs) show significant potential for Li extraction from various sources, including brine. This study aimed to synthesize a novel manganese‑aluminum double-layered hydroxide (Mn<img>Al LDH) combined with keratin for Li extraction from brine. The Keratin/Mn-Al LDH demonstrated efficient Li adsorption with a capacity of 49.7 mg/g and a desorption rate of 92 %. Both the Langmuir and Temkin isotherms effectively represented the equilibrium data, indicating monolayer adsorption with chemisorption characteristics. Moreover, the Pseudo-Second-Order (PSO) kinetic model accurately depicted the adsorption rate, suggesting that chemical interactions predominantly govern the process. Furthermore, the maximum adsorption capacity, as determined by the Langmuir model, was 384.62 mg/g. These results suggest a promising direction for exploring the potential of LDH in Li extraction.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119376"},"PeriodicalIF":9.8,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pilot-scale membrane bioreactor for source-separated urine: Impact of hydraulic retention time on fertiliser production","authors":"Weonjung Sohn ,&nbsp;Andrea Merenda ,&nbsp;A.H. Shafaghat ,&nbsp;Sherub Phuntsho ,&nbsp;Li Gao ,&nbsp;Ho Kyong Shon","doi":"10.1016/j.desal.2025.119388","DOIUrl":"10.1016/j.desal.2025.119388","url":null,"abstract":"<div><div>Prolonged hydraulic retention time (HRT) in urine-treating membrane bioreactors (MBR) remains a challenge as it increases system footprint and costs. This study investigated the effects of HRT conditions in a pilot-scale compact MBR system on urine nitrification performance, aiming to determine the optimal HRT threshold ensuring the effectiveness of the produced liquid fertiliser on hydroponic plant growth. The start-up phase of the MBR successfully achieved stable nitrification at a 7-day HRT under pH-controlled feeding, with a high enrichment of <em>Nitrospira</em> as the predominant nitrite-oxidising bacteria (NOB) and <em>Nitrosococcus</em> as the dominant ammonia-oxidising bacteria (AOB). However, the transition to continuous urine feeding at systematically reducing HRTs of 5 days, 3 days, and 1 day resulted in a decreasing ammonia-to-nitrate conversion rate, dropping from 40 % to 10 % along with a significant nitrite accumulation caused by the high enrichment of AOB over NOB. The urine fertiliser produced under each HRT condition presented distinctive formulations, with a fixed total nitrogen concentration and varying nitrogen species proportions. The fertilisers were applied to hydroponic growth of basil and orchard grass. Both basil and orchard grass showed optimal growth, in terms of roots-to-shoots ratio, at HRTs of up to 5 days. However, orchard grass showed more resilience to the variations in HRT, displaying similar fresh biomass yields across the different conditions. This study offers valuable insights into optimising HRT in urine MBR systems to enhance nutrient recovery as a liquid fertiliser, paving the way for more compact and cost-efficient on-site nutrient recovery and fertiliser application at scale.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119388"},"PeriodicalIF":9.8,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective preparation of CoNi (111) crystal plane to improve hydrogen production by water electrolysis","authors":"Yuan Shi ,&nbsp;Rongjiao Wang ,&nbsp;Shimin Liu ,&nbsp;Jun Zhu ,&nbsp;Xiaofeng Zhu ,&nbsp;Shuqiang Jiao","doi":"10.1016/j.desal.2025.119386","DOIUrl":"10.1016/j.desal.2025.119386","url":null,"abstract":"<div><div>The development of hydrogen energy can significantly reduce reliance on fossil fuels by providing a sustainable hydrogen production pathway. The aim of this study is to selectively prepare CoNi (111) crystal plane catalyst instead of other crystal planes from nickel‑cobalt containing waste to improve the properties of hydrogen evolution reaction by electrolytic water. During the catalyst preparation process, the reduction order and reduction efficiency of Ni²⁺, Co²⁺ and H₂O in the nickel‑cobalt containing waste leachate were controlled to regulate the electrodeposition of Ni²⁺ and Co²⁺, and the generation of crystal planes of CoNi(111). According to the electrocatalytic performance test, the prepared catalyst under conditions of 10 min, <em>c</em>(Ni²⁺) = 0.05 mol/L, 40 mA/cm², <em>m</em>(NiSO₄): <em>m</em>(CoSO₄) = 1:1 has excellent activity, an overpotential of 16.5 mV is required at a current density of 10 mA/cm², and a Tafel slope of 66.5 mV/dec. In this work, using nickel‑cobalt-containing waste as a raw material for catalyst synthesis can not only reduce the cost, but also reduce the harm to the environment. Therefore, this study provides an environmentally friendly and economical method for the preparation of a high-performance and low-cost catalyst for hydrogen evolution reaction.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119386"},"PeriodicalIF":9.8,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-step engineering of multifunctional ZIF-8/PES membrane for synergistic separation of selected proteins, dyes and antibiotics","authors":"Yanan Song ,&nbsp;Rui Zhang ,&nbsp;Baoyuan Dong ,&nbsp;Yuan Liu ,&nbsp;Mingming Zhang ,&nbsp;Xiaoxue Hu ,&nbsp;Jiake Li ,&nbsp;Jianxian Zeng ,&nbsp;Kaipeng Cheng ,&nbsp;Lelin Zeng ,&nbsp;Jie Shen","doi":"10.1016/j.desal.2025.119377","DOIUrl":"10.1016/j.desal.2025.119377","url":null,"abstract":"<div><div>To address the persistent challenges of low separation efficiency and severe membrane fouling in water treatment, we engineered multifunctional mixed matrix membranes (MMMs) through a facile one-step phase inversion method by incorporating zeolitic imidazolate framework-8 (ZIF-8) nanoparticles (0.1–1.0 wt%) into a polyethersulfone (PES) matrix. The effects of ZIF-8 loading (0.1–1.0 wt%) on the morphology, hydrophilicity, porosity, pore size, water flux of the MMMs were investigated. The optimal MMMs delivered a water flux of 299.2 L/m²·h, surpassing the pure PES membrane by 65.90 %. Furthermore, the optimized MMMs demonstrated a 516 % increase in permeate flux along with a 113 % increase in bovine serum albumin (BSA) rejection rate simultaneous, indicating their potential to break through the trade-off effect. The improved rejection rate of BSA was attributed to size exclusion and electrostatic repulsion, originating from the introduction of ZIF-8 nanoparticles. In addition, the rejection rate of Congo Red (CR), Rhodamine B (RhB) and tetracycline hydrochloride (TCH) elevated from 40.94 %, 15.40 % and 59.33 % to 95.40 %, 37.40 % and 96.80 %, respectively. This enhancement stems from the incorporated ZIF-8 nanoparticles, which simultaneously modulated the MMMs' structure and imparted specific interactions: Electrostatic attraction and π-π stacking to CR, electrostatic repulsion and π-π stacking to RhB, and π-π stacking to TCH. Furthermore, the MMMs exhibited improved antifouling performance with the increased flux recovery ratio and reduced irreversible fouling ratio. This facile one-step engineering strategy provides a scalable and efficient route to fabricate high permeability, multifunctional MMMs with increased rejection and improved antifouling performance for integrated separation of proteins, dyes, and antibiotics in complex wastewater.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119377"},"PeriodicalIF":9.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144997199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient radiocobalt removal from seawater and radioactive liquid waste using a radiation-stable layered metal sulfide ion exchanger","authors":"Fei Han ,&nbsp;Aocheng Yuan ,&nbsp;Zhi Zhang ,&nbsp;Qingquan Deng ,&nbsp;Jiaoting Li ,&nbsp;Shuibo Wu ,&nbsp;Mingdong Zhang ,&nbsp;Jingli Mu","doi":"10.1016/j.desal.2025.119379","DOIUrl":"10.1016/j.desal.2025.119379","url":null,"abstract":"<div><div>Radiocobalt (e.g., ⁵⁸Co and ⁶⁰Co), a critical neutron-activated corrosion product in the nuclear industry, poses great challenges due to high toxicity. Effective removal of radioactive Co²⁺ from complex environments is significantly urgent. Metal sulfide ion exchangers (MSIEs) are promising adsorbents; however, limited research has focused on Co²⁺ removal, especially from seawater and real-world radioactive waste. Herein, a layered K₂Cu₂Sn₂S₆ (CTS-1) was reported for the efficient capture of Co²⁺. The charge-balancing K⁺ ions are exchangeable, endowing CTS-1 with Co²⁺ capture ability via an ion exchange mechanism. This mechanism leads to the releasing K⁺ into solution and concurrently immobilizing Co²⁺, which was confirmed macroscopically and microscopically. CTS-1 exhibited Langmuir maximum adsorption capacities of 33.96 and 20.72 mg/g in deionized water and seawater at 25 °C, respectively; the overall adsorption kinetics were similar in both matrices. CTS-1 displayed excellent pH durability with &gt;99 % removal of Co²⁺ at pH 4–8 and high selectivity for Co²⁺ in various natural matrices. Impressively, in seawater (<em>C</em>₀^Co = 5 mg/L), CTS-1 achieved 97.38 % of Co²⁺ removal with a distribution coefficient (<em>K</em>_d) up to 3.817 × 10⁴ mL/g, surpassing many existing adsorbents. Furthermore, CTS-1 exhibited radiation resistance; its structure and adsorption performance remained largely unchanged after a gamma radiation dose of 200 kGy. CTS-1 demonstrated the ability to remove nearly 99 % of radiocobalt from real-world radioactive wastewater, while also showing removal efficiency for other radionuclides like ⁵¹Cr and ⁵⁸Mn. Overall, this work provides a highly promising material to tackle radiocobalt contamination in radioactive waste, greatly promoting environmental protection and safety for the radioactive industry.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119379"},"PeriodicalIF":9.8,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145019631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mussel-inspired surface engineering for LiMn1.9Cr0.1O4@carbon cloth electrodes for high-selectivity membrane capacitive Li-extraction from old brine","authors":"Xiaomeng Tan ,&nbsp;Chengping Li ,&nbsp;Guiying Tian ,&nbsp;Minrui Wang ,&nbsp;Lujie Zhang ,&nbsp;Yifang Gao ,&nbsp;Qixuan Ma ,&nbsp;Yiming Xiao ,&nbsp;Lei Zhang ,&nbsp;Na Tang","doi":"10.1016/j.desal.2025.119374","DOIUrl":"10.1016/j.desal.2025.119374","url":null,"abstract":"<div><div>Membrane capacitive Li-extraction technology (MCLiE) emerges as a highly promising technology for extracting lithium from saline brines, catering to the surging demand for lithium resources. In this study, a positively charged polymeric membrane consisting of dopamine-polyethyleneimine is adhered to the surface of LiMn_1.9Cr_0.1O₄@carbon cloth (LMC@CC/DA-PEI) via surface engineering strategy, which is then employed as a flexible electrode for Li-extraction assembled in the membrane capacitive deionization (MCDI) system. Experimental results confirm that the old brine from West Taijinar with high Li content and low Mg/Li ratio is proper for practical Li-extraction, and the initial discharge/absorption capacities of LMC@CC/DA-PEI-0.5 electrode are 105.9 mAh·g⁻¹/27.4 mg·g⁻¹. Following 200 cycles, capacity retentions of bare LMC@CC and LMC@CC/DA-PEI-0.5 are 43.40 % (13.5 mg·g⁻¹) and 59.77 % (16.4 mg·g⁻¹), respectively. Therefore, surface incorporation of DA-PEI mitigates structural degradation of LMC and stabilizes long-cycle (de)lithiation of Mn-based electrodes. Moreover, the high Li⁺ selectivity (α_Li/Mg = 156.7) is due to the spinel lattice of the LMC in combination with the electrostatic repulsion of the positively charged DA-PEI layer. Considering the strict environmental protection requirements and abundant new energy power supply in salt-lake areas, the assembled MCDI system with the DA-PEI-assisted LMC@CC electrode holds great potential for yielding enhanced Li⁺ selectivity in the lithium recovery from old brine.</div></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":"616 ","pages":"Article 119374"},"PeriodicalIF":9.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}