Separation and Purification Technology最新文献

{"title":"Facet-specific adsorption of fluoride on (100) and (101) surfaces of MIL-88 A(Fe) regulated by interfacial H2O","authors":"Rui Sun ,&nbsp;Jian Wei ,&nbsp;Junyong He ,&nbsp;Dandan Yang ,&nbsp;Jiandong Lu ,&nbsp;Peidong Hong ,&nbsp;Yulian Li ,&nbsp;Yahui Li ,&nbsp;Chao Xie ,&nbsp;Zijian Wu ,&nbsp;Lingtao Kong","doi":"10.1016/j.seppur.2025.136481","DOIUrl":"10.1016/j.seppur.2025.136481","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) are frequently used in model studies of fluoride adsorption, but there is a lack of research on the connection between the molecular details of facet-specific fluoride adsorption and the macroscopic uptake behavior. In this study, a solvent interface effect of H₂O/<em>N</em>,<em>N</em>-dimethylformamide (DMF) was proposed to regulate the growth rate of facets on MIL-88 A(Fe) to enhance fluorophilic property. Three kinds of MIL-88 A(Fe) with different ratios of (100)/(101) facet exposed were synthesized by increasing the proportion of interfacial H₂O in the solvent to enhance the growth rate of (101) facet. Adsorption experiments revealed significant facet-specific adsorption among the three materials, the (100) facet-oriented a-MIL-88 A presented the best fluoride removal performance (53.76 mg/g). The facet-specific adsorption was attributed to two reasons: (1) More -OH on the surface of (100) facet that could remove more fluoride ions by ion exchange. (2) Different coordinate environments of iron atoms, the four-coordinated iron on (100) facet had a higher absolute value of adsorption energy (−5.449 eV), more transferred electrons (0.67 e), and a shorter Fe<img>F bond (1.95 Å) compared with the five-coordinated iron on (101) facet. This work provided a novel research perspective on facet-specific adsorption, offering a new strategy on developing fluoride adsorbents for fluorine-related enterprises.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136481"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732079","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":"Phenolic resin-coated NH2-UiO-66-based mixed matrix membranes for high-efficiency natural gas purification","authors":"Xiaolei Cui ,&nbsp;Yuchen Cui ,&nbsp;Ziang Li ,&nbsp;Zixi Kang ,&nbsp;Soryong Ryan Chae ,&nbsp;Lubomira Tosheva ,&nbsp;Hailing Guo","doi":"10.1016/j.seppur.2025.136489","DOIUrl":"10.1016/j.seppur.2025.136489","url":null,"abstract":"<div><div>Under industrially conditions (pressures ≥10 bar), polymer membranes usually exhibit poor CO₂/CH₄ separation performance and limited stability, severely restricting their practical application. Here, we present a materials engineering strategy, in which phenolic resin is in-situ polymerized on the surface of NH₂-UiO-66 to engineer the MOF-polymer interface, thereby enabling high CO₂/CH₄ separation performance and excellent structural stability for mixed matrix membranes. The phenolic resin forms a uniform coating (∼10 nm thick) on the porous MOF surface, providing a high-density CO₂ active sites that accelerate CO₂ transport. In addition, due to favorable interfacial interactions between the phenolic resin shell and the polyetherimide matrix, the resulting MMMs exhibit excellent stability under high pressures. Compared to the pristine PEI membranes, the CO₂ permeability and CO₂/CH₄ selectivity of the optimized 30-RF@NH₂-UiO-66-PEI membranes are enhanced by 8550% and 1500%, respectively. Under simulated industrial conditions (10/90 CO₂/CH₄ mixture at 10 bar and 50 °C), the engineered membranes maintain a CO₂ permeability of 6105 Barrer and a CO₂/CH₄ selectivity of 30.5, demonstrating excellent separation performance. More importantly, the 30-RF@NH₂-UiO-66-PEI membrane exhibits both scalability (readily extendable to the square-meter level) and cost-effectiveness (∼55 USD per square meter). This work highlights the potential of phenolic resin-modified MOF fillers to enable efficient CO₂/CH₄ separation under realistic industrial conditions.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136489"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788034","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":"Periodate assisted visible photocatalysis over AgIO3-BiOIO3 S-scheme heterojunction toward phenolic pollutants: kinetics enhancement and quantitative structure-activity relationship insights","authors":"Meirui Yu ,&nbsp;Zhenshen Li ,&nbsp;Huahong Xu ,&nbsp;Aobo He ,&nbsp;Yunqian Han ,&nbsp;Min Huang ,&nbsp;Yiwen Peng ,&nbsp;Qiao Wang ,&nbsp;Zhiwei Zhao","doi":"10.1016/j.seppur.2025.136503","DOIUrl":"10.1016/j.seppur.2025.136503","url":null,"abstract":"<div><div>This study investigated the photocatalytic activity and selectivity of AgIO₃-BiOIO₃ composites in degrading emerging phenolic pollutants under periodate (PI)-assisted visible-light conditions. The AgIO₃-BiOIO₃ S-scheme heterostructures with varying AgIO₃ loadings were fabricated via in-situ synthesis, and their efficiency in degrading bisphenol A (BPA) was evaluated. Under combined visible light and PI, the 30AgIO₃-BiOIO₃ catalyst showed the highest catalytic performance, achieving over 99 % BPA removal within 5 min. This remarkable photocatalytic activity was attributed to the synergistic effect of S-scheme heterojunction and electron acceptor PI, which jointly promoted photoinduced carriers separation and minimized recombination losses. In this system, iodate radicals (IO₃^•) formed PI reacting with photoelectrons were the predominant reactive oxygen species, while hydroxyl radicals (^•OH), superoxide radicals (^•O₂⁻), and positive holes (h⁺) played secondary roles. Furthermore, this study systematically evaluated the degradation kinetics of nine phenolic organic pollutants in this PI-assisted photocatalytic system. BPA showed optimal removal efficiency, while benzoic acid, 4-hydroxybenzoic acid, and p-nitrophenol exhibited significant kinetic suppression. The observed selectivity was attributed to a two-step sequential degradation mechanism: pollutant adsorption on the catalyst surface via hydrophobic interactions, followed by oxidative reactions with active radicals. Consequently, selective oxidation strongly correlated with four pollutant parameters (all R² &gt; 0.8), including the octanol-water partition coefficient (XLogP), ionization potential (IP), energy of the highest occupied molecular orbital (E_HOMO), and Hammett parameter (σ⁺), while showing weak correlations with energy of the lowest unoccupied molecular orbital (E_LUMO), Band gap energy (Eg), and half-wave potential (φ_1/2). This study highlighted the crucial role of PI in synergistic degradation and its potential for selective pollutant removal, with minimal susceptibility to environmental ions. The findings offered a valuable reference for targeted organic compounds removal in photocatalytic water treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136503"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788075","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":"Alternative extraction strategies for biosurfactants produced by solid-state fermentation from organic waste","authors":"Nicolás Oiza ,&nbsp;Javier Moral-Vico ,&nbsp;Jose A. Mendiola ,&nbsp;Elena Ibañez ,&nbsp;Antoni Sánchez ,&nbsp;Teresa Gea","doi":"10.1016/j.seppur.2025.136501","DOIUrl":"10.1016/j.seppur.2025.136501","url":null,"abstract":"<div><div>This study investigates alternative extraction techniques in solid-state fermentation of organic substrates. Extracting from a solid matrix is a significant downstream processing challenge, as most technologies are adapted from those used in submerged fermentation without accounting for the solid matrix's intrinsic properties. In this study, extraction of sophorolipids (SL) through conventional ethyl acetate solvent extraction (maceration) was compared to pressurized liquid extraction (PLE) and ultrasound-assisted extraction (UAE). SL are especially relevant not only as potential substitutes to some traditional surfactants but also because of their interesting antimicrobial and anti-cancer properties. All strategies used both ethyl acetate and ethanol to reveal the effect of the solvent on the processes. In this study, PLE with ethyl acetate achieved the highest crude SL yields (0.443 g crude SL/g dry fermented solid). UAE yielded results similar to traditional extraction but reduced the time from 2 h to 30 min; while ethyl acetate generally resulted in higher total crude extracts, ethanol improved SL extraction across all methods. PLE using ethanol achieved the highest SL yields with high purity (0.063 g final extract/g dry fermented solid and 62 % SL content). Afterwards, supercritical fluid extraction with CO₂ (SFE-CO₂) was employed to selectively remove fatty acids and oils from the fermented solids as a pretreatment step before SL extraction. This improved SL recovery, and by performing a sequential ethanol PLE after SFE-CO₂ in the same cell, a 308 % increase in extracted SL yield was achieved compared to traditional solvent extraction with ethyl acetate. This approach also showed itself to be the greenest one following the Path2green methodology and considering solvent consumption. This research shows that PLE, SFE, and UAE are promising, more sustainable, and efficient alternatives to traditional solvent extraction.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136501"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788129","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":"Toluene adsorption on a novel hydrophobic ZSM-5(300)@LDH: Material synthesis, adsorption performances and moisture-resistant characteristics","authors":"Jingkai Hu ,&nbsp;Huaxin Lin ,&nbsp;Zhuowei Cheng ,&nbsp;Jianmeng Chen ,&nbsp;Ruiqi Zhu ,&nbsp;Dongzhi Chen ,&nbsp;Zhaoyang Lu","doi":"10.1016/j.seppur.2025.136429","DOIUrl":"10.1016/j.seppur.2025.136429","url":null,"abstract":"<div><div>Volatile organic compounds (VOCs), particularly toluene, pose significant environmental and health challenges. This study addresses the limitations of ZSM-5 zeolite in humid environments by integrating Si/Al ratio optimization with hydrophobic modification via layered double hydroxide (LDH) coatings. H-ZSM-5 zeolites with Si/Al ratios of 25, 85, and 300 were synthesized using hydrothermal methods, revealing that higher Si/Al ratios enhance specific surface area (387.67 m²/g for Si/Al = 300) and mesopore volume (66.4 %). However, humidity reduced the adsorption capacity (e.g., ZSM-5(300) decreased from 85.37 ± 3.60 to 65.76 ± 2.26 mg/g at 80 % RH). To mitigate moisture interference, three LDH-coated composites were fabricated: self-assembled (ZZ-300@LDH), co-precipitated (GC-300@LDH), and sol-gel-derived (RN-300@LDH). Among these, GC-300@LDH exhibited superior hydrophobicity (water contact angle: 53°) and a hierarchical pore structure (mesopore volume: 0.3688 cm³/g), achieving a toluene adsorption capacity of 94.43 ± 1.43 mg/g under 80 % RH—43.6 % higher than ZSM-5(300). The dual adsorption sites and enhanced surface roughness contribute to prolonged breakthrough time (6.6 ± 0.3 min) and stable regeneration over five cycles. Comparative analysis with industrial zeolites highlights GC-300@LDH's potential for integration into zeolite rotor-RTO systems, offering a scalable solution for humid industrial VOC treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136429"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145746671","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 separation and recovery of strontium and calcium by non-saponification complexing solvent extraction using EHEHPA and ammonium citrate","authors":"Mengnan Yuan ,&nbsp;Peng Cen ,&nbsp;Chengliang Xiao","doi":"10.1016/j.seppur.2025.136497","DOIUrl":"10.1016/j.seppur.2025.136497","url":null,"abstract":"<div><div>Due to their highly similar chemical properties, the separation of strontium and calcium has long been a great challenge. Although conventional saponification extraction enables Sr/Ca separation, it mainly suffers from inherent limitations including high-salinity wastewater generation and process complexity. This study developed a novel extraction approach utilizing ammonium citrate as a complexing agent in an EHEHPA/chloride system. Under optimized operational parameters (20 % EHEHPA, 0.02 mol/L AC, 30 min extraction duration, and 0.05 mol/L HCl for stripping), the system demonstrated remarkable separation performance with a separation factor reaching 161.5, which corresponded to a 27 times increase compared to saponification approaches. A four-stage cross-current extraction process yielded a strontium carbonate product with 91.06 % purity. Mechanistic studies indicated that the exceptional performance of this technology originated from the triple synergistic effects of ammonium citrate: robust pH buffering that stabilized the extraction system; selective coordination chemistry that dramatically increased the Sr²⁺/Ca²⁺ reactivity differential; and interfacial activity modification that boosted mass transfer at the interface. This environmentally benign method can minimize the generation of ammonia‑nitrogen wastewater while operating under ambient conditions. Not only does it provide an innovative solution for greener recycling of strontium resources, it also offers valuable technical insights into the efficient separation of other similar metals.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136497"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788032","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 electro-chemisorption recovery of rare earth elements from simulated coal fly ash matrix","authors":"Eugene Engmann,&nbsp;Abderrahman Atifi","doi":"10.1016/j.seppur.2025.136494","DOIUrl":"10.1016/j.seppur.2025.136494","url":null,"abstract":"<div><div>Coal fly ash (CFA) continues to emerge as a promising nonconventional source of rare earth elements (REEs). The electrochemical extraction and separation of REEs from CFA leachates at realistic concentrations and chemical composition remains underexplored, even in simulated conditions. This study investigates the electrosorption behavior of REEs in simulated CFA electrolyte matrix using a carbon-based electrode (Vulcan XC72R). Application of a cathodic bias over an extended electrolysis duration results in a significant REE recovery efficiency (50 %) albeit with a low REE separation factor (&lt;1) and preferential electrosorption of metal co-ions, such as Fe, Cr and Pb. In contrast, higher REE selectivity is achieved under anodic bias, with a separation factor of about 4.2 at an oxidative current density of 0.25 mA/mg. Adjustment of pH and applied current density further enhances the REE separation factor to over 7, while maintaining a 40 % recovery efficiency. Additional acid functionalization of the carbon electrode improved recovery efficiencies to 60 %, with a slight enhancement in REE selectivity. Overall, anodic electro-chemisorption enables effective and selective REE isolation from matrixial metal co-ions in the CFA leachate. These findings demonstrate efficient and selective REE recovery, through electrochemical separation strategies, from complex CFA leachate.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"386 ","pages":"Article 136494"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145765654","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":"Synergy between Ti single atoms and Ti nanoparticles for promoted photocatalytic CO2 reduction to CH4 over zeolite L/TiO2","authors":"Yonghui Ma ,&nbsp;Baozhen Sun ,&nbsp;Jianqiang Hu ,&nbsp;Lei Su ,&nbsp;Yemei Liu ,&nbsp;Qingling Huang ,&nbsp;Jiale He ,&nbsp;Na Hu ,&nbsp;Xiangshu Chen","doi":"10.1016/j.seppur.2025.136493","DOIUrl":"10.1016/j.seppur.2025.136493","url":null,"abstract":"<div><div>Developing efficient photocatalysts with high activity and selectivity for CO₂ methanation remains a significant challenge. Herein, we report a heterostructured photocatalyst composed of Zeolite L/TiO₂ (ZL/TO), with both Ti single atoms (SAs) and Ti nanoparticles (NPs) anchored on the TO surface. Comprehensive characterizations and density functional theory (DFT) calculations reveal that the synergy between Ti SAs and Ti NPs promotes the separation and transfer of photogenerated charge carriers through a type II heterojunction mechanism, leading to a preferential accumulation of photogenerated electrons on the Ti NPs for CO₂ photoreduction. Furthermore, the Ti NPs play a dual role in the reaction: they not only stabilize the key CO* intermediate, thereby promoting its subsequent exothermic protonation steps, but also facilitate the desorption of the final CH₄ product from the photocatalyst surface. Consequently, using only water vapor and without any sacrificial agents, the optimal photocatalyst achieves a high CH₄ production rate of 49.26 μmol·g⁻¹·h⁻¹ with a selectivity of 95.0 %, which is comparable to the performance of state-of-the-art photocatalysts. This work provides a feasible strategy for effective photocatalytic CO₂ methanation by leveraging the synergy between metal SAs and NPs loaded on a semiconductor support.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"385 ","pages":"Article 136493"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788076","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":"Nitrite photo-assisted catalytic reduction in water: mechanism and kinetic study","authors":"Vanesa A. Hahn,&nbsp;Alicia L. Garcia-Costa,&nbsp;Jose A. Casas","doi":"10.1016/j.seppur.2025.136491","DOIUrl":"10.1016/j.seppur.2025.136491","url":null,"abstract":"<div><div>NO₂⁻, a toxic and potentially carcinogenic nitrogen compound, poses serious risks to water quality and human health. Although several physicochemical treatments have been developed, many convert NO₂⁻ into NH₄⁺ rather than N_2(g), limiting their environmental effectiveness. This study investigates the catalytic photo-reduction of NO₂⁻ using C₂O₄²⁻ as a reducing agent and Fe³⁺ as a homogeneous catalyst under UV irradiation.</div><div>The mechanism, intermediate species, and reaction kinetics were investigated by varying the concentration of the reactants and iron species. Complete NO₂⁻ conversion was achieved within 60 min under optimized conditions, with negligible NH₄⁺ generation and transient detection of NO_X gases only in the early reaction stages.</div><div>Reaction mechanism follows a dual pathway, with contribution of NO₂⁻ disproportionation reactions which generate NO, NO₂ and NO₃⁻. NO and NO₂ can further react with H₂O producing HNO₂ and HNO₃. On the other hand, the photo-assisted catalytic decomposition of C₂O₄²⁻ yields CO₂^•⁻ radicals, which are responsible for the sequential NO₂⁻ reduction to NO^• and N₂O, ultimately achieving N_{2 (g)}.</div><div>Kinetic analysis showed that NO₃⁻ and NO₂⁻ reduction follow an apparent pseudo-first order kinetic model, with higher apparent rate constants at lower initial NO₂⁻ concentration. In contrast, C₂O₄²⁻ consumption follows a zero-order kinetic model.</div><div>These findings provide mechanistic and kinetic insights into the selective photo-assisted reduction of NO₂⁻, contributing to the development of advanced water treatment strategies targeting nitrogenous contaminants.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"386 ","pages":"Article 136491"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799492","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":"Two-step selective extraction of Ga(III) and in(III) from hydrochloric acid media using different ketones","authors":"Nicolas Stankovic,&nbsp;Tatsuya Oshima","doi":"10.1016/j.seppur.2025.136500","DOIUrl":"10.1016/j.seppur.2025.136500","url":null,"abstract":"<div><div>Indium and gallium are critical metals with increasing demand in advanced electronics and photovoltaics but a limited primary supply. This work presents a two-step solvent extraction process using neutral ketones for their selective recovery from hydrochloric acid leachates. Gallium (Ga(III)) was first separated using 2-nonanone, achieving &gt;99 % extraction at 5 mol·L⁻¹ HCl with &lt;1 % indium (In(III)) co-extraction. In(III) was then recovered using MIBK, reaching 85 % in a single stage and up to 99.7 % after three stages. Stripping tests showed that dilute hydrochloric acid (0.01 mol·L⁻¹) enabled &gt;92 % In(III) recovery, while deionized water achieved &gt;99 % across all O/A ratios. Ga(III) was quantitatively stripped at moderate HCl concentrations (0.5–1.0 mol·L⁻¹) and reached approximately 89 % recovery with water at O/A = 2:1. The use of water eliminates acid neutralization steps, reduces chemical consumption, and produces low-ionic-strength solutions that are ideal for downstream recovery operations. Process reproducibility was confirmed by low standard deviation and RSD values (&lt;3 %) under all tested conditions. The integrated two-step flowsheet thus provides a cost-effective, environmentally friendly alternative to traditional systems based on organophosphorus extractants or ionic liquids. Its closed-loop design enables solvent regeneration and aqueous phase recycling, offering a scalable and sustainable approach for Ga(III) and indium recovery from secondary resources and electronic waste.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"386 ","pages":"Article 136500"},"PeriodicalIF":9.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799573","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}