Separation and Purification Technology最新文献

{"title":"Electroconductive MXene-based composite membrane with stable interlayer spacing for electro-enhanced separation performance","authors":"Zhongbao Ma, Peilin Liu, Wenfeng Chen, Chengyi Wang, Yangbo Qiu, Long-Fei Ren, Jiahui Shao","doi":"10.1016/j.seppur.2024.131101","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131101","url":null,"abstract":"Electroconductive membranes are of interest because their selectivity-permeability and fouling resistance are improved with electrical assistance. MXene lamellar membranes are competitive candidates. However, the swelling problem of MXene membranes has not been adequately addressed, especially at dynamic voltages, resulting in weakened separation performance. In this study, carboxylated cellulose nanofibers intercalated MXene membranes with stable interlayer spacing were developed by constructing column-to-beam structure and mortise-tenon connection. The results showed that the interlayer spacing and membrane pore size of the MX/CN composite membrane were almost invariable before and after electro-assisted filtration. Benefiting from the anti-swelling properties and good electrical conductivity, the MXene composite membranes showed a significant increase in the retention of typical monovalent and divalent inorganic salts at external voltages (from 46.2 % and 80.4 % at 0 V to 60.6 % and 88.7 % at 2.0 V for NaCl and Na₂SO₄, respectively), as well as a slight increase in the flux. This enhancement mechanism was attributed to the increase of the Stern layer in the adjacent nanosheets of lamellar membranes under electrical assistance. In addition, external voltage was also effective in improving the fouling resistance and enrichment performance of MXene composite membranes for actual textile wastewater, which might be due to the enhanced electrostatic repulsion and electrokinetic behavior under electrical assistance. This work aims to offer new insights into the advancement of electroconductive membranes with a stable structure for desalination and wastewater treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"244 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823385","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":"Real sample analysis of persistent Contaminant abatement via synergistic adsorption and Visible-Light Catalysis in continuous flow Reactors","authors":"Rajamani Manju, Jeyaprakash Jenson Samraj, Bernaurdshaw Neppolian","doi":"10.1016/j.seppur.2024.131050","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131050","url":null,"abstract":"The bifunctional nickel ferrite (NiFe₂O₄) decorated zeolitic imidazole framework (ZIF-67) nanocomposite was synthesized using a facile hydrothermal method and employed as an efficient adsorbent with photocatalytic characteristics. The adsorptive and photocatalytic efficacy of NiFe₂O₄ decorated ZIF-67 (NF/ZIF) nanocomposite were analyzed against various antibiotics through a systematic approach. A high removal efficiency of 99 %, 94 %, and 87 % of Tetracycline (TC), Sulfamethoxazole (SM), and Ciprofloxacin (CP) was reported by the developed nanocomposite. Batch removal experiments were performed to examine the impacts of initial solution pH, pollutant concentration, and nanocomposite dosage on the adsorption-assisted photocatalytic degradation performances. The as-obtained NF/ZIF nanocomposite, with a high specific surface area, exhibited superior adsorption abilities towards TC, SM, and CP in aqueous solutions. Langmuir isotherm and Pseudo-second-order kinetic models accurately described the adsorption processes. The NF/ZIF nanocomposite demonstrated excellent photocatalytic degradation of antibiotic contaminants. Enhanced optical properties, including increased visible light absorption and reduced recombination of photo-generated e^-/h⁺ pairs, were achieved by tailoring NF onto ZIF. ESR and reactive species scavenging analyses revealed the vital role of ^•OH and ^•O₂^– in the photocatalytic degradation process. Even after six consecutive cycles, the NF/ZIF nanocomposite showed no substantial decline in its adsorptive and photocatalytic effectiveness. After optimization of parameters, a large-scale continuous-flow photocatalytic reactor was tested, achieving TOC removal efficiencies of 76.51 % − TC, 47.85 % − CP, and 66.26 % − SM, in the treatment of pharmaceutical effluent with diverse contaminants. The proposed bifunctional NF/ZIF photocatalytic adsorbent exhibited excellent potential to revolutionize polluted water sources into purified ones.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"44 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823371","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":"Incorporation of crown ether into PEI-polyamide nanofiltration membrane for efficient Mg2+/Li+ separation","authors":"Shuyang Liu, Mingxia Wang, Linfang Dong, Zhenyu Cui, Benqiao He, Jianxin Li, Feng Yan","doi":"10.1016/j.seppur.2024.131054","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131054","url":null,"abstract":"Positive charged nanofiltration (NF) membrane have been triggered for Li⁺ extraction from brine driven by the Donnan effect. However, achieving selective Li⁺ transport channels remains a significant challenge, particularly in brines with a high Mg²⁺/Li⁺ mass ratio. In this work, a rigid crown ether was incorporated into the polyethyleneimine (PEI) based polyamide (PA) membrane for enhancing the robust selectivity of the typical positive charged membrane. Di(aminobenzo)-18-crown-6 (DAB18C6) was chosen as an additional aqueous phase monomer alongside PEI, with both reacting with trimesoyl chloride (TMC) to fabricate membranes via interfacial polymerization (IP). Due to the rigidity and the unique selectivity for alkali metal ions, DAB18C6 molecules not only expand the interval of the tightly stacking PEI-TMC chain in the PA layer, which resulting in high permeability, but also provide selective channels for Li⁺ transport. Therefore, the obtained DAB18C6@PEI@PSF membrane achieving the simultaneous enhancement in permeability (8.2 L·m⁻²·h⁻¹·bar⁻¹) and ion separation factor (<em>S</em>_Li,Mg = 23). Molecular dynamics demonstrated that the DAB18C6 exerts a stronger force on Li⁺ compared to Mg²⁺, which facilitates the transmembrane transport of the monovalent ion and achieves a high separation factor. After three-stage NF treatment process for a simulated salt lake brine with initial Mg²⁺/Li⁺ ratio of 61.5, a permeability liquid with low Mg²⁺/Li⁺ ratio of only 0.16 was obtained, indicating that the DAB18C6@PEI@PSF membrane has promising potential application in the field of high mass ratio Mg²⁺/Li⁺ separation.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"46 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823381","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 performance and centrifugal characteristics of a cascade dewatering equipment","authors":"Pingping Qiao, Meili Liu, Zheyuan Zhang, Yongxiang Feng, Jiaqing Chen","doi":"10.1016/j.seppur.2024.131075","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131075","url":null,"abstract":"This paper addresses the escalating challenge of oil–water separation by proposing a novel concept of partitioned and graded cyclone separation. The primary objective is to mitigate the issue of inefficient heating energy consumption in fluids produced with a high water cut, thereby meeting the demands for a low-carbon and energy-saving process. The paper introduces the concepts of split chamber swirl and targeted separation, and designs cascade dewatering equipment to achieve compact and efficient cascade enhanced dewatering performance. The separation performance of the equipment was analyzed through the combination of experiment and numerical simulation. The results reveal that the centrifugal acceleration of the main swirl chamber is 250 times that of gravity, and the centrifugal acceleration of each subsidiary swirl chamber is 5200 times that of gravity. Large oil droplets are separated in the main chamber, while small oil droplets are separated in the subsidiary swirl chamber, realizing efficient oil–water separation. Compared to single-stage dewatering equipment, the dewatering rate of the cascade dewatering equipment increases by approximately 20 %. When the inlet flow rate is controlled at 1.0 m³/h–1.3 m³/h and the inlet water cut ranges from 70 % to 85 %, the dewatering rate exceeds 70 %, meeting the technical indicators for an oil outlet water cut less than 50 %. Furthermore, by controlling the split ratio within 43 %, the recovery rate of oil can exceed 80 %. It is noteworthy that the cascade dewatering equipment offers a novel solution to the problem of fluids produced with a high water cut.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"12 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823374","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":"Study on high efficiency separation of low condensation lignin and its dissolution mechanism by 1, 4 butanediol combined with p-toluene sulfonic acid pretreatment system","authors":"Zicheng Du, Baojie Liu, Xiaoying Liu, Lu Liu, Chen Liang, Shuangquan Yao, Chengrong Qin","doi":"10.1016/j.seppur.2024.131059","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131059","url":null,"abstract":"Separating low condensed lignin from lignocellulosic biomass is of great importance for achieving its full component conversion. This study proposed a new efficient and environmentally friendly alcohol/acid pretreatment system using 1,4-butanediol (1,4-BDO) as a solvent, combined with <em>p</em>-toluene sulfonic acid (<em>p</em>-TsOH) to efficiently separate low condensed lignin. The results showed that the system could remove 85.55 % of hemicellulose and 84.78 % of lignin in a short time, with a high retention rate of cellulose. Based on the phenomenon of 1,4-BDO molecule protecting lignin structure, the recovered low-condensed lignin structure contains the main aliphatic hydroxyl structure, and the remaining solid surface lignin condensation grains were fewer, and the fiber crystallinity was high, which was beneficial for the preparation of high-value products. In addition, the lignin dissolution kinetics revealed that the <em>p</em>-TsOH/1,4-BDO pretreatment had a lower reaction activation energy, clarifying the solvation effect of 1,4-BDO on efficient lignin dissolution. Finally, combining density functional theory (DFT) from the molecular level clarified that the hydrogen bonding and conjugated effect between 1,4-BDO and lignin structure could effectively reduce the self-condensation reaction of lignin molecules. This study achieved effective separation of lignocellulosic biomass, providing a theoretical basis for the application of 1,4-BDO in biomass component separation, and promoting the development of green and efficient component separation technologies.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"44 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823390","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":"Synergistic electrochemical-cementation processes for selective cadmium recovery from Cd-Ni solutions","authors":"Shuyue Feng, Chenqian Chen, Wenjuan Zhang, Jianyong Che, Chengyan Wang, Yongqiang Chen","doi":"10.1016/j.seppur.2024.131057","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131057","url":null,"abstract":"Nickel and cadmium are critical materials in the clean energy sector, but their limited availability poses significant challenges. Recycling these metals from secondary sources can mitigate supply risks, yet their separation during recovery is often difficult, especially when striving to conserve energy and minimize environmental impact. This study proposed an electrochemical method for the efficient separation and recovery of cadmium from Cd-Ni solutions. Under optimal conditions of 0.5 V applied voltage, 10 g/L initial acid concentration, 50 °C temperature, and a 2h duration, over 95.6 % of cadmium was recovered with a purity of 93.3 %, while nickel loss was restricted to just 5.38 %. The high separation efficiency is attributed to the preferential reduction of cadmium over nickel, even at low concentrations, as confirmed by impedance spectroscopy and SEM analysis. Cadmium deposition occurred exclusively at the anode, with minimal nickel loss primarily resulting from the formation of Ni(OH)₂. Kinetic analyses revealed that zinc dissolution at both the anode and cathode followed a first-order rate, with the anode dissolving more rapidly, thereby facilitating cadmium deposition. This method offers a sustainable option for recovering these metals from secondary sources by effectively integrating electrochemical and cementation processes.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"12 1 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823377","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":"Record-high benzene adsorption capacity of colloid-imprinted mesoporous carbons synthesized from biomass by ball milling","authors":"Barbara Szczęśniak, Łukasz Osuchowski, Jerzy Choma, Mietek Jaroniec","doi":"10.1016/j.seppur.2024.131097","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131097","url":null,"abstract":"A facile mechanochemical synthesis was used for the preparation of mesoporous carbons with large uniform mesopores. The one-pot synthesis relied on the fast ball milling of only two reagents, tannins, and silica colloids, within 10 min, followed by direct thermal treatment at 750 °C leading to carbons with uniform mesopores of about 25 nm, high specific surface areas up to ∼1000 m²/g, and total pore volumes up to 2.80 cm³/g. This seems to be the first attempt to employ mechanochemistry for the synthesis of colloid-imprinted carbons. Moreover, the procedure can be easily extended for the synthesis of carbons with bimodal mesoporosity by adding a Pluronic-type template to the milling system. The latter synthesis afforded carbons with bimodal mesoporosity, having predominantly pore sizes of 13.8 and 24.8 nm, a high specific surface area of 1218 m²/g, and an exceptionally high pore volume of 4.75 cm³/g, without using an activating agent. To the best of our knowledge, this sample adsorbed a record amount of benzene at 20 °C, namely 48.0 mmol/g. It is shown that the total pore volume is a determining factor for benzene adsorption on diverse porous solids. High mesoporosity in carbons might be essential in adsorption and catalysis-related applications.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"47 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823386","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":"Tailoring of a chitosan-based adsorbent with target-specific sites for efficient adsorption-reduction of chromium ion pollutant","authors":"Ling Peng, Ziyan Hu, Jiejie Cui, Nina Yang, Rui Bao, Yizeng Dai, Qi Wang, Yao Jiang, Peng Cui","doi":"10.1016/j.seppur.2024.131055","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131055","url":null,"abstract":"Chromium (Cr) ion is a serious pollutant in industrial wastewater, and the removal and simultaneous detoxification of Cr(VI) remains a persistent challenge. Here, we present a novel chitosan-based adsorbent, GA/CS-PEI-PVA (GCPP), designed with crosslinked networks and target-specific sites by incorporating polyethyleneimine (PEI), polyvinyl alcohol (PVA), and 3,4,5-trihydroxybenzoic acid (GA) into chitosan. The harvested GCPP demonstrated enhanced thermal stability, mechanical strength, and specific surface area. Remarkably, GCPP achieved a Cr ion adsorption capacity of up to 290.77 mg·g⁻¹ and a reduction ratio of Cr(VI) to Cr(III) of 83.20 %. Mechanism studies revealed that the adsorption of Cr ion on GCPP involved complexation and electrostatic attraction processes, while the grafted phenolic hydroxyl groups significantly promoted the detoxification of Cr(Ⅵ) to Cr(Ⅲ). This study represents a significant advance in the development of efficient adsorbents for the practical treatment of Cr ion-containing pollutants.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"51 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823384","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":"Bimetallic NiMnOx catalysts enable cascade C–H and C–C bond cleavage for efficient low-temperature ethane oxidation","authors":"Qianqian Gao, Jiali Tang, Jinhang Yang, Beilong Lin, Peirong Chen, Mingli Fu, Daiqi Ye, Yun Hu","doi":"10.1016/j.seppur.2024.131051","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131051","url":null,"abstract":"Transition metal oxide catalysts offer a cost-effective and efficient alternative to noble metal catalysts for the environmental treatment of light alkane pollutants. In this study, a bimetallic Ni_0.2Mn_0.8O_x catalyst was evaluated for its effectiveness in the low-temperature catalytic oxidation of ethane, which achieved an ethane conversion of 90 % at only 286 °C and exceeded 99 % at 325 °C. Under conditions of poisoning with 5 vol% H₂O or 10 ppm H₂S for 10 h, the activity of the Ni_0.2Mn_0.8O_x catalyst remained essentially unchanged. The characterization results indicated that the Ni sites on the surface of Ni_0.2Mn_0.8O_x were favorable for the adsorption of ethane. Simultaneously introducing Ni promoted lattice distortion in MnO_x and increased the exposure of lattice oxygen to participate in the reaction. In mechanistic studies, it was elucidated that the Ni sites play a distinct role in facilitating the scission of C–H bonds, while the Mn sites exhibit a specific propensity towards breaking C–C bonds. The synergistic effect between Ni and Mn sites promoted the activation of ethane on the surface of Ni_0.2Mn_0.8O_x and decomposing into H₂O and CO₂ under the function of lattice oxygen. The monolithic catalysts demonstrated long-term stability, maintaining removal rates of ethane above 85 % under dry conditions and 75 % under wet conditions for up to 100 h. This performance suggests significant potential for industrial applications.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"244 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A portable oxygen-concentrator for climbing to the death zone without oxygen canisters","authors":"Salman Qadir, Saravanakumar Ganesan, Rafael L.S. Canevesi, Carlos A. Grande","doi":"10.1016/j.seppur.2024.131094","DOIUrl":"https://doi.org/10.1016/j.seppur.2024.131094","url":null,"abstract":"Climbing any of the 14 tallest peaks in the world at altitudes of over 8,000 m takes the human body to the extremes of survival. Most alpinists ascend to “the death zone” using oxygen canisters. However, this practice has a drawback: these geological sanctuaries became a canister cemetery. This work evaluates the feasibility of using pressure swing adsorption (PSA) as a technological solution to reduce littering in high-performance mountaineering. A PSA unit can provide enough oxygen for the ascent and for the descent, where most deaths happen due to insufficient oxygen. Zeolite 13X was the selected material because other improved zeolites are highly sensitive to moisture. The two-column PSA unit is designed to fit in a backpack and operate at low temperatures and pressures. Oxygen with 80 % purity and 45.5 % recovery was obtained. The battery energy consumption for portable oxygen concentrators is 11.78 Wh/mol to produce 8.6 mmol·kg⁻¹·s⁻¹ of oxygen.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"38 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823370","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}