Separation and Purification Technology最新文献

{"title":"A green and efficient process for the separation and extraction of vanadium and titanium from vanadium-titanium magnetite acid leachate","authors":"Guopeng Yang, Shuxin Wang, Wenjuan Guan, Shengxi Wu, Xinsheng Wu, Guiqing Zhang, Mingyu Wang, Qinggang Li","doi":"10.1016/j.seppur.2025.135374","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135374","url":null,"abstract":"To address the challenges associated with complex composition and difficult separation in the hydrometallurgical processing of vanadium‑titanium magnetite (VTM), this study proposes an integrated process for the selective separation and recovery of vanadium (V) and titanium (Ti) from acid leachate of VTM. Ti was first selectively precipitated using sodium phosphate, achieving a precipitation efficiency of 93.91% for Ti, while the co-precipitation efficiencies for V, Al, and Fe were limited to 2.76%, 4.64%, and 5.87%, respectively. The resulting titanium phosphate precipitate was converted into metatitanic acid with NaOH, and subsequent washing and calcination yielded a TiO₂ product with a purity of 98.73%. Notably, the sodium phosphate used was regenerated and reused, achieving a recovery efficiency of 97.01%. V was then efficiently extracted from the titanium-depleted solution using a solvent system composed of 20% (<em>v</em>/v) P204 and 5% (v/v) octanol, achieving a V extraction efficiency exceeding 99.9%. The loaded organic phase was stripped with HCl, and the resulting V-rich stripping solution was directly subjected to hydrolytic precipitation. The V precipitation efficiency reached 94.32%, and the final VO₂ product, obtained via vacuum calcination, exhibited a purity of 99.58%. This integrated process, comprising phosphate precipitation for selective titanium separation followed by solvent extraction and hydrolytic precipitation for vanadium separation, offers significant advantages, including simplified operation, effective separation, and cleaner production. Compared to traditional methods, it circumvents issues related to organic phase emulsification and the difficult of stripping Ti, as well as the generation of ammonia-containing wastewater for V, thus providing a sustainable solution for VTM hydrometallurgy.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"114 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260819","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":"Preservation of biological systems and materials using deep eutectic solvents: Pinnacles and pitfalls","authors":"Heedayah H. Azouz, Maan Hayyan","doi":"10.1016/j.seppur.2025.135584","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135584","url":null,"abstract":"Preserving biological systems and materials is crucial for sustaining advancements in biotechnology and ensuring their effective application in fields such as medicine, agriculture, and environmental science. To overcome the limitations of conventional preservation methods and enhance the stability and longevity of diverse biological systems and their products, researchers are exploring the use of novel formulations, including deep eutectic solvents (DESs). This state-of-the-art review comprehensively examines the application of DESs as versatile preservation agents, highlighting their unique physicochemical properties that facilitate stabilisation of sensitive cells and biomolecules. Herein, the interactions between DESs and target biological systems and materials are systematically assessed, considering key factors that influence preservation efficacy such as concentration, temperature, and environmental conditions. Furthermore, DESs are compared with traditional preservation methods, emphasising the former’s advantageous potential to enhance the durability and bioactivity of biological systems and molecules. This review aims to synthesise recent findings on the topic, advancing understanding of their potential in the field. Current limitations and knowledge gaps call for intensified research to optimise formulations and expand their application. At the same time, existing evidence highlights the promise of DESs in driving innovative solutions that contribute to sustainability and effectiveness in biotechnology.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"121 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260917","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":"Plasma electrolytic oxidation-derived WO3 and WO3@LDH hybrid coatings as immobilized photocatalysts for solar−driven water treatment","authors":"Dominika Czekanowska, Ermelinda Falletta, Melissa Greta Galloni, Vincenzo Fabbrizio, Qianqian Chen, Carsten Blawert, Maria Serdechnova, Enrique Rodríguez Castellon, Paweł Głuchowski","doi":"10.1016/j.seppur.2025.135585","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135585","url":null,"abstract":"This study presents the development of immobilized photocatalytic coatings for the degradation of diclofenac (DCF), a persistent pharmaceutical pollutant, under solar light irradiation. Two-dimensional tungsten oxide (2D-WO₃) nanoflakes were synthesized via hydrothermal treatment and incorporated into plasma electrolytic oxidation (PEO) coatings, together with Zn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>Al layered double hydroxide intercalated with 2-mercaptobenzothiazole (Zn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>Al LDH-MBT). This study demonstrates, for the first time, the synergistic effect of incorporating 2D-WO₃ nanoflakes and Zn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>Al LDH into PEO coatings on Al, enhancing photocatalytic performance compared to previous WO₃-containing systems. To the best of our knowledge, this is the first report on the use of WO₃ nanoparticles combined with Zn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>Al LDH, an established PEO coating morphology modifier, within the PEO process for water remediation applications. Coatings were fabricated using silicate-, aluminate-, and tungstate-based electrolytes. Structural and morphological analyses confirmed the successful incorporation of WO₃ particles and LDH-derived phases. Diffuse reflectance spectroscopy revealed a WO₃ band gap of approximately 2.40 eV, suitable for solar light activation. Coatings with moderate WO₃ loading (10 g/L) exhibited superior photocatalytic performance compared to those with higher loading (15 g/L), attributed to the formation of inactive metallic tungsten (W⁰) at increased WO₃ concentrations. Photocatalytic degradation of DCF under solar light reached up to 92 % for WO₃ powder and 92 %, 66 %, and 87 % for WO₃-doped coatings in silicate-, aluminate-, and tungstate-based electrolytes, respectively. Incorporation of Zn<img alt=\"single bond\" src=\"https://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/55/entities/sbnd.gif\" style=\"vertical-align:middle\"/>Al LDH remained high activity and increased in the case of aluminum electrolyte from 66 to 87 %. The production of transformation products during the photocatalytic processes confirmed multi-step degradation. These results highlight the synergistic role of WO₃ and LDH in PEO coatings, demonstrating their potential for scalable, solar-driven water treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"37 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145283349","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":"Performance of FeII/FeIII-LDH@CF cathode for degradation of xenobiotic 4-hydroxy-TEMPO by heterogeneous electro-Fenton: Kinetics and degradation pathways","authors":"Aydeniz Demir, Nihal Oturan, Clément Trellu, Mohamad M. Chehimi, Mehmet A. Oturan","doi":"10.1016/j.seppur.2025.135470","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135470","url":null,"abstract":"Advances in technology, coupled with the need to preserve the environment, necessitate the development of novel industrial procedures that rely on chemicals whose effects on living organisms remain insufficiently studied. 2,2,6,6-tetramethylpiperidin-1-oxyl, also known as 4-hydroxy TEMPO (TMP) or Tempol, is a widely used aminoxyl compound in chemistry and medicine. However, no studies have reported on the removal of TMP from aqueous environments, despite its extensive industrial applications. This study investigates the performance of both classical electro-Fenton (CEF) and heterogeneous electro-Fenton (HEF) processes for TMP elimination from contaminated water. To this end, a FeII/FeIII-layered double hydroxide (LDH)-modified carbon felt cathode (synthesized carbon felt, SCF), capable of operating across a wide pH range, was synthesized and applied in the HEF process. The effects of operating parameters such as initial pH, cathode formulation, and applied current were systematically evaluated. Oxidation kinetics and the mineralization pathway of TMP were established, with the second-order rate constant for hydroxyl radical oxidation determined as 1.45 × 10⁹ M⁻¹ s⁻¹. Chromatographic analyses identified intermediate products, carboxylic acids, and inorganic end-products, enabling the proposal of degradation pathways. The FeII/FeIII-LDH@CF cathode achieved complete degradation of 0.1 mM TMP within 60 min at 300 mA. Nearly complete mineralization (98.0 %) was reached after 6 h at 500 mA, demonstrating the superior efficiency of the HEF process. Overall, these findings highlight the potential of the FeII/FeIII-LDH@CF cathode as a highly effective electrode material for the removal of emerging organic pollutants from contaminated water.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"10 1","pages":"135470"},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145295156","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":"Capture of volatile RuO4 from oxidized simulated used nuclear fuel solutions","authors":"Jeffrey D. Einkauf, Jennifer M. Pyles, Marcy E. Lamb, Luke R. Sadergaski, Harry M. Meyer, Lætitia H. Delmau, Bruce A. Moyer, Jonathan D. Burns","doi":"10.1016/j.seppur.2025.135576","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135576","url":null,"abstract":"Ruthenium is a challenging fission product in used nuclear fuel (UNF) reprocessing due to its complex redox chemistry, variable speciation in nitric acid, partial extractability, and volatility. This work presents a strategy for Ru removal based on the volatilization of RuO₄ using the strong oxidant sodium bismuthate, followed by RuO₂ deposition onto various substrates. Among the materials tested, polymer-based substrates such as polyolefin wax film (Parafilm®), exhibited superior performance, achieving up to near-quantitative Ru removal from solution. After dissolution of the substrate, 99.6 % of the Ru was recovered as RuO₂. The deposition mechanism onto the polyolefin wax film involves both physisorption and chemical reaction through oxidative cleavage of olefinic bonds within the polymer. In contrast, on inorganic substrates such as Al foil, RuO₄ undergoes incomplete surface adsorption and reduction, as confirmed by FTIR and XPS analyses. This approach remains effective under conditions of simulated oxidation of UNF solutions, selectively removing Ru while leaving other fission products in solution. Capture of RuO₄ offers a practical and efficient strategy for ruthenium decontamination and recovery, offering a route for integration into existing UNF reprocessing flowsheets to enhance overall process safety and performance.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"88 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260820","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":"Molten salt-driven basic site evolution in brucite-derived MgO for high-capacity and durable intermediate temperatures CO2 capture","authors":"Xinyang He, Yushu Chen, Xueyun Zhong, Mingjia Ma, Sijia Weng, Peng Liu, Mingli Fu, Steven L. Suib, Pingxiao Wu, Daiqi Ye","doi":"10.1016/j.seppur.2025.135626","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135626","url":null,"abstract":"MgO was obtained from the calcination of naturally occurring brucite (Mg(OH)₂) and the NaNO₃ was used to promote carbon capture at 300 °C under 50 % CO₂. As the mass ratio of NaNO₃/MgO is 22 %, the CO₂ adsorption capacity achieves to 438.2 mg/g initially and remains 75 % at the 30th cycle. The molten NaNO₃ fills into the pores of MgO and facilitates the crystallite growth, resulting in the specific surface area from 114 m²/g to 12 m²/g. However, due to the dissociation of Mg²⁺-O²⁻ bonds by molten NaNO₃, the medium basic sites increase to 8.21 mmol/g, enhancing of CO₂ adsorption. The initial adsorption in first 10 mins is fast and the subsequent slow adsorption accounts for over 90 % of the total CO₂ adsorption. <em>In situ</em> characterization confirms the contribution of NaNO₃ in the carbonation, which provides O²⁻ by itself and dissolves the MgO. Precipitates of MgCO₃ grow into particles in melting NaNO₃ rather than impermeable layers, so the carbonation level of MgO improves to 40 %. The decrease of 25 % adsorption capacity is ascribed to residual carbonates after desorption at 450 °C. DFT calculations demonstrate that the adsorption energy decreases with the loading of NaNO₃ on MgO, as the valence band maximum gets closer to the Fermi level. After the carbonation of NaNO₃-modified MgO, the π-bonding electronic state of CO₂ and the p-band center of the substrate moves away from the Fermi level, indicating a stable configuration. This study provides a promising brucite-derived adsorbent for medium-temperature CO₂ capture.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"14 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145261127","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":"Polydopamine as electron shuttle and dispersant: Unlocking nZVI reactivity coupled with Shewanella oneidensis MR-1 for efficient Cr(VI) removal","authors":"Liwen Zhang ,&nbsp;Shaohua Chen ,&nbsp;Shanyi Tan ,&nbsp;Huizi Wen ,&nbsp;Shuyu He ,&nbsp;Fen Zhang ,&nbsp;Xiangru Zuo ,&nbsp;Ling Xiong","doi":"10.1016/j.seppur.2025.135630","DOIUrl":"10.1016/j.seppur.2025.135630","url":null,"abstract":"<div><div>The inherent limitations of nano zero-valent iron (nZVI) severely limit its widespread application in heavy metal pollution remediation. To address this, <em>Shewanella oneidenis</em> MR-1 (MR-1) was utilized to counteract the iron oxide passivation layer on nZVI surface, however, this approach suffered from low electron transfer rate between MR-1 and the passivation layer. In this research, a novel PDA-modified nZVI composite (PDA-nZVI) was synthesized. Compared to unmodified nZVI, the proportions of Fe⁰ and Fe(II) on the PDA-nZVI surface increased 2.06 % and 21.63 %, respectively. The electrochemical tests (e.g., a more negative corrosion potential, a lower charge-transfer resistance, a higher current density, and a 3.4-times larger electrochemical active surface area for PDA-nZVI compared to nZVI) confirm that PDA enhances electron transfer from iron core to the outside, thereby promoting Fe⁰ availability and Fe(II) generation on the PDA-nZVI surface. Meanwhile, PDA modification successfully enhanced the material's dispersibility and hydrophilicity in aqueous solutions. Results demonstrate that the Cr(VI) elimination capacity of the PDA-nZVI and MR-1 combined system (PDA-nZVI/MR-1) was markedly superior to that of the nZVI/MR-1 system. Mechanism analyses demonstrate that PDA can act as an electron shuttle to accelerate electron transfer between MR-1 and the passivation layer, thereby promoting more Fe(III) transformation to Fe(II). This process enables more Cr(VI) to be reduced to Cr(III), which is subsequently adsorbed or complexed on the material surface as Cr₂O₃/FeCr₂O₄ and Cr_xFe_1-x(OH)₃, ultimately being removed from the solution via co-precipitation. The PDA-nZVI/MR-1 system successfully overcomes the inherent limitations and exhibits an exceptional Cr(VI) elimination capability</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"381 ","pages":"Article 135630"},"PeriodicalIF":9.0,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260918","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":"Solvent resistant integrally skinned asymmetric polyimide nanofiltration membrane based on thermal treatment for the efficient separation and concentration of spiramycin","authors":"Chen-Jie Wei, Hao-Nan Yang, Yan-Nan Wu, Yuan-Xue Li, Jing-Feng Chen, Chen Peng, Li-Gang Lin, Li-Fen Liu","doi":"10.1016/j.seppur.2025.135620","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135620","url":null,"abstract":"The isolation of spiramycin (SPM), a macrolide antibiotic with potent activity against gram-positive bacteria and intracellular pathogens, is critical for pharmaceutical applications and antimicrobial research. As emerging antibiotic resistance underscores the need for effective therapeutics, efficient extraction and purification of SPM from fermentation broths remain essential to ensure its availability for clinical use, industrial production, and structural derivatization. Compared with the traditional separation processes, membrane process has attracted extensive attention owing to its low cost, high separation efficiency, and energy savings in the traditional medicine industry. A novel soluble polyimide (PI) material with flexible branches and imide rings was synthesized based on molecular structure design. Using the homemade polymer material, a novel recyclable, acid-alkali resistant and solvent resistant PI nanofiltration (NF) membrane was fabricated for SPM extraction. The membrane exhibited optimal performance at 20 wt% solid content, and the effects of pressure, flow rate, concentration, and temperature on its separation performance were investigated. The rejection rate of SPM was &gt;91 % and the permeance of butyl acetate reached 21 L/(m^{2<strong>.</strong>}h), respectively. The permeances of rose Bengal in methanol, acetone, and isopropyl alcohol were 38, 48, and 10 L/(m^{2<strong>.</strong>}h), with separation performances of 92.0 %, 92.3 %, and 92.4 %, respectively. Moreover, the enhanced stability with a permeance of 21 L/(m^{2<strong>.</strong>}h) and rejection of &gt;91 % for SPM was maintained after five days of long-term practical operation. The obtained PI NF membrane is prospective for improving traditional antibiotic extraction and advancing nanofiltration membrane in the pharmaceutical system.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"35 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260915","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":"Recent advances in antibiotic removal methods from wastewater: A comprehensive review","authors":"Insha Hamid, Waheed Ahmad Khanday","doi":"10.1016/j.seppur.2025.135478","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135478","url":null,"abstract":"The incessant consumption of antibiotics globally has led to widespread contamination across ecosystems, particularly aquatic ones. Acute and chronic exposures to antibiotics via the consumption of water contaminated by them pose serious health risks. This review discusses antibiotic classification, the impacts of antibiotic pollution on the environment, and exhaustively details the recent trends and advances in various biological, chemical, and physical antibiotic removal methods, discussing various research studies along with the advantages and disadvantages of each method. It is deduced herein that the biological methods may lead to the generation and spread of antibiotic-resistant bacteria (ARB) in some cases, while the chemical methods are largely limited by exorbitant costs and secondary pollution. Among the physical methods of antibiotic pollution remediation, adsorptive removal via agricultural/biomass waste-derived activated carbons (ACs) and biochars (BCs) exhibits the most potential for removing antibiotics from water and wastewater in a cleaner, simpler, and cheaper manner, bolstering the principle of circular economy and helping mitigate and/or eliminate aquatic antibiotic pollution sustainably. Agricultural/biomass waste-derived carbons, especially when magnetized or chemically enhanced, present a strong balance between cost, performance, and environmental safety.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"154 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145261123","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":"Insight into synthesis of graphitized activated carbons with high oxidation resistance for gas adsorption","authors":"Junfeng Li, Wei Zhou, Xiaoxiao Meng, Jingyu Li, Zhipei Tang, Min Xie, Chunwei Zhang, Luming Li, Fei Sun, Haibo Liu, Xiu You, Yingzhu Guo, Xinkui Mei, Jihui Gao, Guangbo Zhao","doi":"10.1016/j.seppur.2025.135623","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.135623","url":null,"abstract":"Oxidation resistance is a critical factor restricting the industrial application of activated carbons (ACs). To address this issue, we propose a two-step activation–carbonization strategy to prepare graphitized ACs with high porosity and oxidation resistance. The activation process achieved a well-developed pore structure, while the subsequent carbonization process facilitated high-temperature pyrolysis and catalytic graphitization, leading to short-range microcrystalline reorganization and functional groups decomposition. Among the tested catalysts, Ni exhibited the strongest catalytic effect on graphitization, significantly enhancing both the graphitization degree and microcrystalline size of ACs compared to Fe and Co. Interestingly, the decomposition of functional groups and the growth of microcrystalline are major strategies for the increase in oxidation resistance of ACs, where the average microcrystalline size is linearly correlated with the oxidative activation energy. Owing to low content of functional groups and high graphitization degree, the loss of toluene adsorption capacity decreased from 16.5 % to 4.3 % in the humid environment, and the isosteric heat of CO₂ adsorption decreased. This work not only develops an effective strategy for improving oxidation resistance of ACs but also provides valuable insights for their industrial applications in gas adsorption.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"121 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260817","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}