Separation and Purification Technology最新文献

{"title":"Synergistic effect of polymer-ZIF-8 and γ-CDs anchored polyamide membranes for enhanced Li+/Mg2+ separation","authors":"Xinyue Zhang, Shichen Xiao, Xudong Wang, Jiajin Hao, Huihui Zhang, Jin Wang, Lei Wang","doi":"10.1016/j.seppur.2025.134298","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134298","url":null,"abstract":"Metal-organic frameworks (MOFs) have received significant interest as ion-selective materials, due to the tunable pore size and diverse topological structures. However, given by the inferior interfacial compatibility, MOFs are difficult to uniformly disperse into polyamide membranes, which significantly hinders the development of MOFs-based polyamide nanofiltration membranes. Here, we proposed a strategy involving the use of polyethyleneimine (PEI) modified with ZIF-8 particles (P-ZIF-8) to eliminate interfacial problems and surface defects in polyamide membranes. Subsequently, configuring with γ-cyclodextrins (γ-CDs) to form a homogeneous graft solution, which were anchored to the polyamide layer surface by inducing a secondary interfacial polymerization (IP) reaction. The increased positive charge of the membranes improved the sieving performance of the monovalent and divalent ions. The composite nanofiltration membrane exhibited a uniform pore size of 0.55 nm and a water flux of 32 L‧m⁻²‧h⁻¹. The separation factor (S_Li⁺_/Mg²⁺) of the modified nanofiltration membrane (S_Li⁺_/Mg²⁺= 3.7) increased by 228 % compared to the PEI-TMC nanofiltration membrane (S_Li⁺_/Mg²⁺= 12.5). The composite membrane operated continuously for 48 h without deterioration in the separation performance. Density functional theory (DFT) was further elucidated the mechanism by which the introduction of P-ZIF-8 could effectively separate Li⁺/Mg²⁺. This work is of great significance for enhancing the synergy between MOFs and polyamide membranes, as well as for developing polymers-MOFs membranes to extract lithium resources from brines with complex compositions.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"21 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594883","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":"Micro/nanoplastics removal from the aquatic environment using micro/nanobubbles-assisted flotation technology: A review","authors":"Ahmed Hamdy Saadeldien Sadek ,&nbsp;Fatehy M. Abdel-Haleem ,&nbsp;Mahmoud A. Ateia","doi":"10.1016/j.seppur.2025.134262","DOIUrl":"10.1016/j.seppur.2025.134262","url":null,"abstract":"<div><div>Micro/nanoplastics (MNPs) spark global concerns due to their dangers to the aquatic environment. Significant efforts are made to remove MNPs from the environment using innovative technologies. This work explores the progress of the flotation methods based on Micro/Nanobubbles (MNBs) for the MNPs elimination. The sources, distribution pathways, environmental, and health impacts of MNPs are discussed. The limitations of conventional technologies in MNPs removal draw attention to the advanced approaches like MNBs. MNBs are tiny gas-filled cavities with sizes ranging from micrometers to nanometers. Their unique characteristics, such as high surface area-to-volume ratios, elevated zeta potentials, and prolonged stability in water, enhance their application in purification processes. Therefore, the fundamental properties, generation techniques, and applications of these MNBs across diverse aquatic settings are reviewed. It is focused on the role of MNBs in enhancing the flotation-based removal of MNPs by addressing the flotation mechanisms, influencing factors (e.g., MNPs/MNBs properties, operational parameters), and process optimization. Finally, this work aims to evaluate the current limitations of scalability and assess future directions for implementing MNB-assisted flotation of MNPs remediation in real-world scenarios. It also highlights recent initiatives in plastic waste management focused on establishing regulatory frameworks and policies aimed at mitigating plastic pollution, thereby guiding researchers toward the development of innovative and effective flotation strategies for better management and mitigation of MNPs pollution in aquatic environments.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"377 ","pages":"Article 134262"},"PeriodicalIF":8.1,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586738","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":"Magnetic MoS2–Fe3O4 nanocomposites for dual-function adsorption and photocatalytic removal of acetamiprid from water","authors":"Leonardo O. Amaral, Josefa Ortiz-Bustos, André C. Horta, João S. Amaral, Santiago Gómez-Ruiz, Isabel del Hierro, Ana L. Daniel-da-Silva","doi":"10.1016/j.seppur.2025.134285","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134285","url":null,"abstract":"The persistent detection of the neonicotinoid pesticide acetamiprid (ACE) in aquatic environments, driven by its chemical stability and water solubility, necessitates the development of more efficient remediation strategies. In this work, magnetic MoS₂–Fe₃O₄ nanocomposites were synthesized for the combined adsorption and photocatalytic removal of ACE. Two composites with MoS₂: Fe₃O₄ mass ratios of 5:1 (MF-5:1) and 2:1 (MF-2:1) were prepared by solvothermal growth of Fe₃O₄ on pre-synthesized MoS₂ nanosheets and characterized using XRD, FTIR, XPS, SEM, TEM, and electrochemical techniques. MF-5:1 exhibited superior performance, removing 55 % of ACE (10 ppm) after 3 h of UV–VIS irradiation and retaining 40 % efficiency after three reuse cycles. Langmuir isotherm analysis revealed maximum adsorption capacities of 26.1 mg g⁻¹ for MoS₂ and 19.2 mg g⁻¹ for MF-5:1, exceeding values reported for many conventional adsorbents. Although Fe₃O₄ incorporation slightly reduced adsorption capacity, it enabled magnetic separation, facilitating material recovery. Photocurrent and Mott–Schottky analyses confirmed enhanced charge separation and donor density, contributing to improved photocatalytic activity. These findings demonstrate the potential of MoS₂–Fe₃O₄ nanocomposites as multifunctional, magnetically recoverable materials for pesticide removal and provide new insights into surface and charge transport properties relevant to environmental remediation technologies.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"101 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594766","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":"Thermodynamic and kinetic Insights into impurity removal during electron beam drip melting of titanium Scrap: Toward sustainable High-Purity recycling","authors":"Yijiala Yiliti ,&nbsp;Yanan Zhou ,&nbsp;Wenjun Han ,&nbsp;Gengyi Dong ,&nbsp;Yinong Wang","doi":"10.1016/j.seppur.2025.134204","DOIUrl":"10.1016/j.seppur.2025.134204","url":null,"abstract":"<div><div>The removal of metallic (Fe, Ni, Al) and gaseous (O, N) impurities during electron beam drip melting (EBDM) of titanium scrap was systematically investigated through coupled thermodynamic analysis and mass transfer modeling. Under ultrahigh vacuum (&lt;3 × 10^-3 Pa) and localized overheating (up to 2400 K), Fe and Ni exhibited &gt; 70 % removal via evaporation from free-falling droplets, governed by temperature-dependent evaporation coefficient (<em>β_Fe</em> ≈ <em>β_Ni</em> ≈ 10). Oxygen reduction (1290 → 290 ppmw) was attributed to TiO sublimation at melt surfaces, driven by Marangoni flow under Gaussian heat distribution. Kinetic studies revealed that impurity migration was controlled by liquid boundary layer diffusion (<em>k_m^Fe</em> = 1.2 × 10^-4 m/s at 2260 K), while thermodynamic equilibria defined deoxidation limits (<em>C[O]*</em> ≈ 200 ppmw at 25 kW). These findings advance the design of sustainable titanium recycling processes through fundamental chemical engineering principles.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"377 ","pages":"Article 134204"},"PeriodicalIF":8.1,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594769","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":"The hydrophobization enhancement mechanism of a novel Gemini hydroxamic acid for ilmenite flotation","authors":"Ying Wang, Sheng Liu, Wei Chen, Guangyi Liu","doi":"10.1016/j.seppur.2025.134288","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134288","url":null,"abstract":"In this study, a novel Gemini hydroxamic acid collector <em>N,N′</em>-bis[(3-hydroxyamino)-propoxy]-<em>N,N′</em>-dihexyl dithiooxamide (DSHPA) was firstly synthesized and used for ilmenite flotation. The micro-flotation results showed that DSHPA achieved 64.8 % flotation recovery difference between ilmenite and titanaugite in artificially mixed minerals, which was better than benzohydroxamic acid (BHA), octyl hydroxamic acid (OHA) and sodium oleate (NaOL), resulting in the effective separation between ilmenite and titanaugite. Contact angle tests showed that the surface hydrophobicity of ilmenite was significantly enhanced after treatment with DSHPA. <em>In situ</em> AFM images, FTIR, and XPS further confirmed the extensive adsorption of DSHPA molecules on the ilmenite surface. Moreover, the adsorption of DSHPA on ilmenite was markedly stronger than on titanaugite, providing strong evidence for its effectiveness in the selective separation of ilmenite from titanaugite. XPS and DFT calculations demonstrated that two hydroxamic acid groups were the active centers of DSHPA, which could separately bind to Fe and Ti on the ilmenite surface with forming two five-member rings. As result, “H” shape hydrophobic structure consisting of two C₆ hydrophobic chains and a closed “Loop” structure between two five-member rings formed on DSHPA-treated ilmenite surface rendered an improved hydrophobicity of the ilmenite surface. Combined with DSHPA’s suitable foaming ability, DSHPA exhibited better flotation performance than NaOL, BHA and OHA. The results of this study provide valuable insights into the molecule design of functional surfactant that can finely regulate the hydrophobicity of surface, which sheds light on improving separation efficiency among various substances in a broad range of engineering applications.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"147 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594767","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":"Molecular insights into the enhanced water purification of algal-rich water by in-situ ozonation/manganese-doped ceramic membrane process","authors":"Jingyi Zou, Yanjun Li, Tianhao Tang, Yuepeng Deng, Kai Yang, Yulong Yang, Shengyin Tang, Xihui Zhang","doi":"10.1016/j.seppur.2025.134283","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134283","url":null,"abstract":"Harmful algal blooms significantly increase algae-derived organic matter (AOM) and algal toxins in surface waters, posing serious threats to aquatic ecosystems and public health. This study employed an integrated <em>in-situ</em> ozonation/manganese-doped catalytic ceramic membrane (Mn-CM) process to effectively purify algal-rich water. The effect of ozone dosage and the molecular-level mechanisms of organic contaminants removal were systematically investigated. Compared to sole ozonation or sole Mn-CM processes, the integrated process exhibited enhanced performance, achieving removal efficiencies of 22.56 % for dissolved organic carbon (DOC) and 92.05 % for microcystin-LR (MC-LR) at an ozone dosage of 1.0 mg/L. Results from Fourier-transform ion cyclotron resonance mass spectrometry and machine learning revealed the integrated process notably promoted the oxidative removal of unsaturated compounds with low O/C and high N/C ratios, mainly via oxygen addition, dealkylation and deamination reactions. MC-LR was more efficiently removed than DOC, predominantly due to its greater unsaturation, lower O/C and higher N/C ratios relative to raw AOM. Moreover, the integrated process facilitated oxidation of MC-LR into less toxic byproducts. These findings offer a theoretical basis for the future development and practical application of this integrated approach in real algal-rich water treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"3 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586991","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 metal recovery from ternary lithium-ion battery cathodes via potential-controlled electrodeposition in deep eutectic solvents","authors":"Chih-Min Chang ,&nbsp;Wei-Fan Kuan","doi":"10.1016/j.seppur.2025.134284","DOIUrl":"10.1016/j.seppur.2025.134284","url":null,"abstract":"<div><div>This study presents a potential-controlled electrodeposition strategy for selectively recovering nickel (Ni), cobalt (Co), and manganese (Mn) from leachates of ternary lithium-ion battery cathodes using a choline chloride (ChCl)-urea deep eutectic solvent (DES). Results demonstrate that remarkable leaching efficiencies for all target metals (91.2 %, 99.0 %, and 95.7 %, for Ni, Co, and Mn, respectively) were successfully achieved at 150 ℃. Upon cooling, it is observed that a majority of Ni²⁺ was separated through spontaneous precipitation, enabling preliminary fractionation of the leachate. Sequential electrodeposition at −1.1 V, −1.75 V, and −0.8 V facilitated the selective recovery of Co, Mn, and Ni, respectively, with high purity confirmed by structural and elemental analyses. Compared to conventional recycling methods, this approach enables efficient metal separation without the need for additional chemical additives and within relatively short electrodeposition time (2 h). These findings highlight a practical route for developing additive-free, energy-efficient, and environmentally friendly recycling technologies for spent lithium-ion battery cathodes using DES systems.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"377 ","pages":"Article 134284"},"PeriodicalIF":8.1,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586993","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":"Improvement mechanism of graphite flotation from kaolinite induced by laboratory synthesized polyaluminum chloride","authors":"Changping Ke,&nbsp;Yangkun Fan,&nbsp;Shijie Zhang,&nbsp;Jiakun Tan,&nbsp;Long Liang","doi":"10.1016/j.seppur.2025.134290","DOIUrl":"10.1016/j.seppur.2025.134290","url":null,"abstract":"<div><div>The effect of laboratory synthesized polyaluminum chloride (PAC), which was prepared by alkali titration method, on the flotation performance of graphite was systematically studied in this work. Flotation tests using natural graphite ore demonstrated that PAC could enhance flotation yield while maintaining concentrate quality. Further flotation tests using artificial mixed graphite-kaolinite minerals demonstrated that the addition of PAC at around 30 mg/L can improve graphite recovery and separation efficiency, and has no significant negative effect on the loss on ignition in concentrate. The possible improvement mechanism of PAC on graphite flotation including water entrainment, slime coating, bubble-graphite attachment was revealed by characterization methods such as zeta potential measurements, focused beam reflectance measurement (FBRM), particle vision and measurement (PVM), single bubble loading tests and contact angle measurements. Zeta potential measurements show that PAC at 30 mg/L neutralized the negative charge on the surface of kaolinite, while graphite was positive charged. The real-time FBRM results show that the average chord length of kaolinite particles increased significantly when PAC concentration was 30 mg/L and decreased at PAC concentration of 90 mg/L, while graphite particles remained in a dispersion state. However, the PVM results indicated that the slime coating between kaolinite and graphite surface was aggravated when PAC was 30 mg/L and then got diminished at 90 mg/L. The single bubble loading tests and contact angle measurements proved that PAC at 30 mg/L significantly increased the attachment probability between bubble and graphite particles. Meanwhile, the contact angle of graphite remained stable without significant reduction, effectively maintaining the surface hydrophobicity of graphite and ultimately promoting graphite flotation recovery. This work is expected to provide theoretical understanding and technical support for graphite flotation by the adjustment of PAC concentration.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"377 ","pages":"Article 134290"},"PeriodicalIF":8.1,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594768","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 and comprehensive extraction of multiple heavy metals from high-arsenic copper dross via stepwise phase transformation and supergravity separation","authors":"Xiang Li, Jintao Gao, Xi Lan, Zhancheng Guo","doi":"10.1016/j.seppur.2025.134289","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134289","url":null,"abstract":"The copper dross generated in the crude lead refining process contains a large number of heavy metals. In this study, a new method was proposed for efficient and comprehensive extraction of multiple heavy metals from high-arsenic copper dross via stepwise phase transformation and supergravity separation. The phase transformation of copper dross was researched, which demonstrated that the metal lead and lead-rich phases were transformed into liquid at 650 ℃ and the crude lead with a lead content up to 96.38 wt% was obtained by supergravity separation. Then, Cu₃As could be further separated out with the temperature increased to 700 ℃, and the residue was copper matte, both products had a high copper content of 68.74 wt% and 62.85 wt%. In addition, the arsenic in the copper dross was mainly enriched in Cu₃As, and the recovery rate was as high as 97.5 %. Hence, the copper dross could be divided into three products to be recovered separately via supergravity separation without addition and secondary pollution compared with the current mainstream processes. According to the above findings, a new process was further developed for green and efficient stepwise recovery of polymetallic resources in crude lead refining.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"21 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594765","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":"Green synthesis of robust chitosan-based hydrogel beads for Cr(VI) removal from water","authors":"Chaofan Zheng, Kuiyuan Sun, Qu Wu, Yongjun Sun, Bincheng Xu, Linbing Sun","doi":"10.1016/j.seppur.2025.134271","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.134271","url":null,"abstract":"Chitosan-based adsorbents have been widely regarded as promising candidates for water purification. However, the potential environmental burdens, such as excessive organic solvent release and high energy consumption, associated with their manufacturing stage are largely overlooked. Herein, we propose a relatively facile and green synthesis strategy for constructing a robust chitosan-based hydrogel bead (CHB-M) with high positive charge density. Specifically, the preparation process was conducted at room temperature under air atmosphere, without the use of organic solvents like cyclohexane, heating energy or inert gas. More importantly, the charge density and bead size of CHB-M can be finely tuned by simply changing the introduced cationic content and dripping method, respectively. The resultant CHB-M not only exhibited high mechanical strength but also manifested outstanding adsorption performance toward anionic pollutant Cr(VI) with an adsorption capacity of 234.99 mg/g (at pH 3.0 and room temperature for 24 h), superior to that of most previously reported adsorbents. Furthermore, a continuous flow adsorption system using CHB-M as a filter material was operated for 1440 h to purify micropolluted water. The system consistently achieved over 99 % of Cr(VI) removal efficiency with a treatment capacity of 24 L/g, demonstrating the potential of CHB-M for practical applications. Energy and economic analyses revealed the high energy efficiency and economic benefits of the synthesis process. The proposed green strategy for chitosan-based hydrogel synthesis provides a new perspective on developing truly environmentally friendly adsorbents for sustainable water purification.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"72 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586992","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}