Separation and Purification Technology最新文献

{"title":"MOF/Polydopamine-modified MXene based mixed matrix membrane for per- and polyfluoroalkyl substances removal from real wastewater","authors":"Sana Ahmad Minhas, Ravi P. Pandey, Maguy Abi Jaoude, Shadi W. Hasan","doi":"10.1016/j.seppur.2025.133139","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133139","url":null,"abstract":"Per- and poly-fluoroalkyl substances (PFAS) are persistent emerging water contaminants and their removal from water bodies is a rigorous challenge. In this work, the removal of long and short chain PFAS from synthetic and real wastewater is examined by using advanced cellulose acetate (CA) based mixed-matrix membranes (MMMs). The membranes incorporate engineered nanofillers (DMMIL) consisting of iron-based metal–organic framework (MOF), in-situ grown in polydopamine-coated MXene nanosheets (PD@Ti₃C₂T_x). The nanofillers and membranes are thoroughly characterized with an array of microscopy and spectroscopy techniques. These include SEM, EDX, XRD, FTIR, XPS, AFM, water contact angle, and zeta potential measurements to examine the properties of nanomaterials and the effect of nanofiller loading on the microscopic morphology, surface texture, wettability, and ionization properties of membranes. The membrane with optimal nanofiller loading (50%DMMIL/CA) exhibited 1.42-fold enhanced water flux and 1.65-fold enhanced perfluorooctanoic acid (PFOA) rejection compared to the pristine CA membrane in the synthetic wastewater system. The fouling test was run for cycles of PFOA filtration followed by cleaning with DI water, and the produced membranes showed up to 68% flux recovery, with 54% shown by the 50%DMMIL/CA membrane after 5 cycles. The membrane’s effectiveness in removing both long- and short-chain PFAS was tested in synthetic and real wastewater. In real wastewater samples, the 50%DMMIL/CA membrane removed 60% of PFOA, 57% of perfluoroheptanoic acid (PFHpA), and 55% of perfluorohexanoic acid (PFHxA), as well as other organic and inorganic pollutants.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"72 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893368","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":"Reactive extractive distillation based on vapor waste heat saving for the esterification of isoamyl propionate","authors":"Qiyan Yang ,&nbsp;Rongli Shan ,&nbsp;Hongbo Xu,&nbsp;Wenxin Wang,&nbsp;Yumeng Wang,&nbsp;Xin Li,&nbsp;Yinglong Wang,&nbsp;Limei Zhong,&nbsp;Jingwei Yang,&nbsp;Shuai Wang","doi":"10.1016/j.seppur.2025.133305","DOIUrl":"10.1016/j.seppur.2025.133305","url":null,"abstract":"<div><div>The new intermediate heat transfer technology can be used to save energy in special distillation. In this study, the reactive extractive distillation (RED) was utilized to synthesize isoamyl propionate (ISOAM) and separate azeotropes generated during the production process. To this end, entrainers were screened on the perspective of relative volatility, quantum chemistry and toxicity. Two methods based on the recovery of the vapor waste heat were studied to achieve energy savings considering that traditional heat integration cannot be adopted and the insufficient temperature disparity between the top vapor stream of the high-temperature column and bottom liquid stream of the low-temperature column: intermediate heat exchange RED (IHE-RED) and vapor recompression-assisted reactive extractive distillation (VR-RED). Factors influencing the IHE-RED performance were analyzed, and the optimal process was obtained. Optimal VR-RED was evaluated in terms of economy, environment, energy, and exergy loss, as well as the IHE-RED. The results demonstrate that the total annual cost (TAC) of IHE-RED and VR-RED are reduced by 2.96 % and 5.52 % compared with RED. The total gas emissions of CO₂, SO₂ and NO_X for IHE-RED and VR-RED were lower than that of RED by 5.63 % and 23.45 %, respectively. The IHE process provides a new method to realize energy savings for RED when traditional heat integration technology cannot be applied. Although VR-RED performs better in this case, IHE-RED has the potential to replace vapor recompression technology when the temperature of the stream to be heated is higher than that of the heat supply stream.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"371 ","pages":"Article 133305"},"PeriodicalIF":8.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889630","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":"Highly selective and efficient gold recovery from ferricyanide-thiourea synergistically catalyzed thiosulfate leachate by diphenylphosphine extraction and acidic thiourea back-extraction","authors":"Qian Li, Yuehong Zhu, Yan Zhang, Xiaoliang Liu, Yonghe Ma, Yongbin Yang, Tao Jiang","doi":"10.1016/j.seppur.2025.133311","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133311","url":null,"abstract":"Thiosulfate is a promising cyanide alternative. Our recent research has revealed that the ferricyanide (Fe(CN)₆³⁻)-thiourea (TU) synergistically catalyzed thiosulfate system holds great potential for leaching gold. This paper investigated the gold recovery from Fe(CN)₆³⁻-TU-S₂O₃²⁻ leachate by diphenylphosphine (HDPP) extraction and acidic thiourea (HCl/TU) back-extraction. HDPP was confirmed to have outstanding extraction percentage, excellent selectivity towards gold and high recycling stability. Under optimal conditions, nearly 100 % gold extraction was obtained within 10 min with minimal extraction of other metal ions. Even after five extraction cycles using HDPP, the gold extraction percentage remained above 99 %. Among the explored strippers, HCl/TU exhibited remarkable gold stripping performance. More than 99 % gold was obtained after five stages back-extraction. Driven by the synergistic effects of H⁺ and TU, the σ bond between P and Au was readily broken, enabling the simultaneous HDPP regeneration and gold stripping. The HDPP regenerated after five stripping stages still achieved a gold extraction percentage of over 99 %. This study provides a novel perspective on gold recovery from its thiosulfate leachate and significantly contributes to the advancement of industrial application of iron-based thiosulfate gold leaching systems.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"20 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893370","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":"Polyamide reinforced alginate-based hydrogel for efficient uranium extraction from seawater","authors":"Long Huo ,&nbsp;Feixiang Gao ,&nbsp;Maokui Li ,&nbsp;Junhang Wang ,&nbsp;Xuanyu Li ,&nbsp;Jianwei Bai ,&nbsp;Haoyuan Wu ,&nbsp;Hayinaer Azhati ,&nbsp;Chunhong Zhang","doi":"10.1016/j.seppur.2025.133330","DOIUrl":"10.1016/j.seppur.2025.133330","url":null,"abstract":"<div><div>The sustainable development of nuclear power hinges on accessing sufficient and stable uranium resources. Although the ocean contains abundant uranium, its low concentration and the presence of various interfering ions pose great challenges to extracting uranium from seawater. Herein, the sodium alginate-polyamidoxime/hyperbranched polyamide hydrogel spheres with high stability and adsorption capacity were developed. The gel spheres are molded by crosslinking sodium alginate with Ca²⁺ and form a three-dimensional network structure through the covalent cross-linking of glutaraldehyde, which endows the hydrogel spheres with great stability and forms a pore structure. Accordingly, the unique spherical structure endows it with unparalleled recovery performance, enhancing its ability to efficiently recycle after uranium extraction. Adsorption experiments show that the maximum capacity reaches 537.8 mg·g⁻¹ at a pH of 6. Notably, the hydrogel spheres can adsorb uranium over a larger pH range and maintain morphological stability, which makes them suitable for uranium recovery in complex situations like seawater. Furthermore, the adsorption capacity was successfully preserved in five adsorption–desorption cycles, with a high removal rate from 95.07 % to 87.37 %. The dynamic cycle experiment reveals that uranium extraction in real seawater can still reach 82.59 %, indicating a high potential for seawater applications.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"371 ","pages":"Article 133330"},"PeriodicalIF":8.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893364","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-pot synthesis of cost-effective dual functional material from solid waste for integrated CO2 capture and utilization","authors":"Xinyang Xu, Bocheng Yu, Muhammad Saddam Hussain, Yaozu Wang, Qinghai Li, Yongqing Xu, Yanguo Zhang, Hui Zhou","doi":"10.1016/j.seppur.2025.133309","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133309","url":null,"abstract":"Integrated CO₂ capture and utilization (ICCU) using dual-functional materials (DFMs) offers significant potential for achieving net-zero emissions by reducing the economic costs of CO₂ capture and utilization (CCU). This is accomplished by eliminating the need for temperature-swing processes and bypassing CO₂ compression and transportation steps. However, the current ICCU processes still face challenges related to high economic and energy costs. In this study, a novel method is proposed for synthesizing ICCU DFMs with enhanced CO₂ capture and conversion performance through the recycling of waste eggshells and waste printed circuit boards (PCBs). The synthesis method uniquely integrates metal extraction from waste PCBs and modification of waste eggshells in a single process using organic acid. The characteristics of the DFMs were thoroughly analyzed using techniques such as XRD, SEM, TEM, BET, ICP-OES, in-situ DRIFTS, and TGA. The ICCU performance of the DFMs was evaluated in a fixed-bed system, and a techno-economic analysis was conducted to assess the market viability. The results showed that the DFM derived from waste materials achieved a CO₂ capture capacity of 9.56 mmol/g, a CO₂ conversion of approximately 90 %, and near 100 % CO selectivity at 650 °C, significantly outperforming the raw eggshell benchmark (CO₂ capture capacity &lt; 5.4 mmol/g, CO₂ conversion rate &lt; 75 %). According to the techno-economic analysis, the DFM synthesized from waste materials demonstrated both excellent performance and a reduced production cost for CO in the current ICCU-RWGS process, facilitating the advancement of the ICCU-RWGS technology and contributing to sustainable development.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"37 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889629","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 activation of peroxydisulfate by Cu-biochar hybrid materials: Source and transfer direction of interface electrons","authors":"Liujing Dong, Xing Lan, Dengyu Ying, Qiuyan E, Jiaying Yan, Hailin Tian, Haixia Zhao, Yingping Huang, Yanfen Fang","doi":"10.1016/j.seppur.2025.133329","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133329","url":null,"abstract":"Electron transfer between active sites on metal–carbon hybrid materials (MHMs) and oxidants facilitates the generation of reactive species for degrading toxic organic pollutants, yet the activation mechanism remains unclear. We developed a Cu-biochar composite (Cu-BC) through pyrolysis of Cu-rich hyperaccumulators. Cu-BC demonstrated exceptional peroxydisulfate (PDS) activation capability, achieving 92 % tetracycline (TC, 10 mg·L⁻¹) removal within 2 h under visible light irradiation. In contrast to the blank BC/PDS/Vis system, which generated only reactive oxygen species (ROS) of ·O₂^– and ¹O₂ for TC degradation at a reaction rate constant of <em>k_obs</em> = 0.0075 min⁻¹, the Cu-BC/PDS/Vis system produced additional ·SO₄⁻ and ·OH, leading to a threefold increase in <em>k_obs</em> to 0.0204 min⁻¹. Scavenging experiments quantified the contributions of ·SO₄⁻ and ·OH to TC degradation at 25.5 % and 2.3 %, respectively. The galvanic oxidation process, masking experiments and density functional theory calculations reveal importance of electron transfer processes. In addition to the π electrons from carbon substrates (&lt;17.9 %), electrons from carbonyl groups (C=O) (18.2 %) are more effectively transferred to adjacent ≡Cu^Ⅱ on the Cu-BC surface. This neglected interfacial electron transfer (IET) enables the Cu^I/Cu^II/Cu^III cycle to activate PDS to ·SO₄⁻, which allows the TC degradation percentage to remain above 77.1 % after 5 cycles. The activity can be restored by regeneration of C=O via calcination (200 ℃) for the IET process. This study clarifies the IET mechanism between carbon substrates and metal sites on the surface of MHMs and is of great significance for developing efficient MHMs. In addition, the system has good environmental applicability and low toxicity.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"43 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893421","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":"Ionic liquid-incorporated triazine-based porous organic polymer membranes for CO2 separation","authors":"Xueru Yan, Tianqi Song, Zheng Wang, Xiao Xu, Pengfei Zhang, Kecheng Guan, Eiji Kamio, Hideto Matsuyama","doi":"10.1016/j.seppur.2025.133301","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133301","url":null,"abstract":"Porous organic polymers (POPs) have been considered promising materials for membrane-based gas separation technology. POPs incorporated with CO₂-philic media have been demonstrated to be effective in improving CO₂ permeance and CO₂/N₂ selectivity. Herein, an ionic liquid (IL)-assisted polymerization method was developed to incorporate CO₂-philic ILs on POP networks. In this structure, a typical IL with high CO₂ affinity is stabilized in the pores and interlayers of POP membranes. Owing to the synergistic effect of the controllable formation of the POP structure and the incorporation of the CO₂-philic IL, the CO₂ permeance and CO₂/N₂ selectivity are fortified simultaneously. The IL-POP membrane shows a CO₂/N₂ selectivity of 39.1 with a CO₂ permeance of 186 GPU at 120 ℃. Furthermore, the prepared IL-POP membranes demonstrated long-term stability with great resistance to temperature (up to 120 ℃) and transmembrane pressure (4 bar).","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"11 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893422","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":"Degradation of methylparaben by anodic oxidation, electro-Fenton, and photoelectro-Fenton using carbon felt-BDD cell","authors":"Aline B. Trench ,&nbsp;Nihal Oturan ,&nbsp;Aydeniz Demir ,&nbsp;João P.C. Moura ,&nbsp;Clément Trellu ,&nbsp;Mauro C. Santos ,&nbsp;Mehmet A. Oturan","doi":"10.1016/j.seppur.2025.133335","DOIUrl":"10.1016/j.seppur.2025.133335","url":null,"abstract":"<div><div>In this study, the comparative efficiency of different electrochemical advanced oxidation processes, such as anodic oxidation with electrogenerated H₂O₂ (AO- H₂O₂), electro-Fenton (EF), and its combination with UV irradiation (photoelectron-Fenton (PEF)), was investigated for the removal of methylparaben (MP) using a carbon felt cathode and a boron-doped diamond anode. The EF process achieved a higher MP removal efficiency than the AO-H₂O₂ process for all applied current densities. The total organic carbon (TOC) removal after 6 h of treatment at a current density of 10 mA cm⁻² reached 75.0 % and 91.9 % for the AO- H₂O₂ and EF processes, respectively. The combination of EF and UV light improved the efficiency of the EF process. The PEF process achieved a TOC removal of 84.6 % in only 2 h at 5 mA cm⁻² and 96.8 % after 6 h of treatment. Furthermore, based on identifying oxidation reaction intermediates and short-chain carboxylic acids generated during the treatment, a reaction pathway for methylparaben mineralization by hydroxyl radicals was proposed.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"371 ","pages":"Article 133335"},"PeriodicalIF":8.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893417","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":"Boosting effect of oxygen vacancy on peroxymonosulfate activation over CoWO4 for sulfapyridine removal","authors":"Xinyang Wang ,&nbsp;Weilai Wang ,&nbsp;Jianbiao Peng ,&nbsp;Pengkun Wei ,&nbsp;Guangxuan Yan ,&nbsp;Zhiguo Cao","doi":"10.1016/j.seppur.2025.133285","DOIUrl":"10.1016/j.seppur.2025.133285","url":null,"abstract":"<div><div>Sulfapyridine (SPD) as one of typical sulfonamides was frequently detected in natural environment, and it exhibited potential ecological environment and health risks. Peroxymonosulfate (PMS) activation could produce reactive oxygen species (ROSs) for efficient antibiotics removal. Herein, oxygen vacancy rich CoWO₄ (CoWO₄-<em>x</em>) catalysts were obtained through hydrothermal and alkali treatment. The alkali treatment not only improved the pore structure of CoWO₄-<em>x</em>, but also introduced more oxygen vacancies to induce electron rearrangement. CoWO₄-<em>x</em> exhibited better efficiency in SPD removal by PMS activation, and SPD degradation ratio is highly dependent on oxygen vacancy content. Especially, CoWO₄-0.5 achieved the best SPD degradation ratio of more than 98 % within 5 min and <em>k</em>_obs of 0.702 min⁻¹. The SPD degradation efficiency highly related to the factors of reaction temperature, CoWO₄-0.5/PMS/SPD dosage, initial pH, and co-existing anions. CoWO₄-0.5 exhibited outstanding reusability in SPD removal and practical application potential for other organic pollutant degradation. Oxygen vacancy promoted electron transfer from CoWO₄-<em>x</em> catalyst to PMS molecule, and thus enhanced the cleavage of O−O bond in PMS molecules during subsequent ROSs formation. According to electron paramagnetic resonance (EPR) spectroscopy and quenching tests, the ROSs of <span><math><msubsup><mrow><mi>S</mi><mi>O</mi></mrow><mrow><mn>4</mn></mrow><mrow><mo>∙</mo><mo>-</mo></mrow></msubsup></math></span>, <span><math><mrow><msup><mrow><mspace></mspace></mrow><mo>∙</mo></msup><msubsup><mtext>O</mtext><mrow><mtext>2</mtext></mrow><mo>-</mo></msubsup></mrow></math></span> and ¹O₂ are crucial for SPD degradation, while <span><math><mrow><msup><mrow><mspace></mspace></mrow><mo>∙</mo></msup><mtext>OH</mtext></mrow></math></span> is not the key species. Reaction mechanism, SPD degradation products, and degradation routes were proposed. The aquatic toxicity of products was retrieved by ECOSAR, and the toxicity of small molecule products containing amino group should be highly emphasized.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"371 ","pages":"Article 133285"},"PeriodicalIF":8.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143893362","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":"Separation and recovery of low-concentration rare earth elements from wastewater using a porous magnetic composite of carboxymethyl-β-cyclodextrin and silica","authors":"Jie Liu, Xingjie Lu, Qianting Li, Zhixiao Xue, Qiulu Zhang, Yuxiu Zhao, Guizhi Wu, Bingrui Ma, Wenxiang Xia","doi":"10.1016/j.seppur.2025.133313","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133313","url":null,"abstract":"The traditional adsorbents using to remove rare earths from wastewater is often restricted in practice due to the lack of selectivity and difficult recovery. To resolve this problem, the magnetic core–shell composites Fe₃O₄@SiO₂ containing well-dispersed carboxymethyl-β-cyclodextrin (CM-β-CD) on the surface have been successfully synthesized through the condensation reaction and used as high-efficiency adsorbents (Fe₃O₄@SiO₂@CM-β-CD) for removal of Er(Ⅲ). The obtained magnetic hybrid materials were characterized and analyzed by the advanced means (FI-IR, SEM/TEM, XRD, VSM, BET, TGA, XPS). The results showed that Fe₃O₄@SiO₂@CM-β-CD has spheric structure, crystalline properties and are heat-resistant and porous. The effects of initial concentration of metal ions, solution pH, coexisting impurity ions and other rare earths on adsorption of Er(Ⅲ) performance were investigated. According to the results, the materials achieved the best adsorption performance at pH 4.5. The maximum adsorption capacity was 13.63 mg·g⁻¹. The adsorption process can be described by the Langmuir adsorption isotherm and pseudo-second-order kinetic equation, and indicating that the adsorption was monolayer chemical adsorption. Through thermodynamic data analysis, the adsorption process of Er(Ⅲ) by Fe₃O₄@SiO₂@CM-β-CD was a spontaneous endothermic reaction. Na(Ⅰ), Mg(Ⅱ), Ca(Ⅱ), Zn(Ⅱ), Ni(Ⅱ) and Al(Ⅲ) ions were further introduced in the solution to study the adsorption selectivity of Fe₃O₄@SiO₂@CM-β-CD. Except for trivalent Al(Ⅲ), which strongly interferes with adsorption performance, Fe₃O₄@SiO₂@CM-β-CD exhibited good adsorption selectivity for other metal ions. Additionally, it was confirmed that Fe₃O₄@SiO₂@CM-β-CD still maintained high adsorption performance after 6 cycles of using HCl solution. The investigation of interaction mechanism showed that during the adsorption process of Er(Ⅲ), oxygen-containing functional groups and nitrogen-containing functional groups as electron-donating groups participated in the coordination reaction with Er(Ⅲ), thus achieving efficient adsorption.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"15 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889599","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}