Separation and Purification Technology最新文献_第10页

Incorporating organic macrocyclic cavitands into polyimide to fabricate high-performance hybrid carbon molecular sieve membranes for gas separation

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131810

Min Deng, Jing Wei, Zikang Qin, Zheng Yan, Zimei Zhang, Junfeng Zheng, Lin Yang, Lu Yao, Wenju Jiang, Xiaohua Ma, Zhongde Dai

{"title":"Incorporating organic macrocyclic cavitands into polyimide to fabricate high-performance hybrid carbon molecular sieve membranes for gas separation","authors":"Min Deng, Jing Wei, Zikang Qin, Zheng Yan, Zimei Zhang, Junfeng Zheng, Lin Yang, Lu Yao, Wenju Jiang, Xiaohua Ma, Zhongde Dai","doi":"10.1016/j.seppur.2025.131810","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131810","url":null,"abstract":"Precisely controlling the pore structure of carbon molecular sieve (CMS) membranes is essential for optimizing their gas separation performance. In the present work, 4-sulfocalix[4]arene (SC), an organic macrocyclic cavitands (OMC), was incorporated into polyimide (PI) to modulate the pore structure and enhance the gas separation performance of CMS membranes. The results indicated that SC molecules formed multiple disconnected PI-SC chain network regions within the PI matrix, providing additional short-distance rapid transport pathways for CO2 and He, thereby enhancing their permeability. Moreover, the inclusion of SC increased the sp2 C content in the CMS membrane, leading to a more ordered graphite-like carbon structure that enhanced the molecular sieving ability. In addition, by adjusting the content of SC and the carbonization temperature, the resulting PI/SC CMS membranes exhibited enhanced permeability for CO2 and He, along with high gas selectivity. Under optimized conditions, the CO2 and He permeabilities of the PI/SC-5-550 CMS membrane were significantly increased compared to the pure PI precursor membrane (PCO2: 257.2 Barrer vs 1665.9 Barrer; PHe: 260.4 Barrer vs 2578.9 Barrer). Furthermore, the selectivity for CO2/CH4 and He/CH4 increased by approximately 247 % and 378 %, respectively, both surpassing the latest Robeson upper bounds.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"47 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044590","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}

引用次数: 0

Extracting metallic lithium and separating diffusion pump oil from lithium slag using a novel negative pressure distillation technology

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131821

Mingliang Yang, Shichao Wang, Zhaowang Dong, Bin Yang, Tao Qu

{"title":"Extracting metallic lithium and separating diffusion pump oil from lithium slag using a novel negative pressure distillation technology","authors":"Mingliang Yang, Shichao Wang, Zhaowang Dong, Bin Yang, Tao Qu","doi":"10.1016/j.seppur.2025.131821","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131821","url":null,"abstract":"Lithium slag, an industrial by-product derived from oil refining systems during the extraction of metallic lithium via molten salt electrolysis, holds a substantial concentration of lithium metal, thus positioning it as a valuable secondary resource. However, disposal poses significant challenges due to the highly reactive nature of the oil and metallic lithium it contains. To address this, a dual-stage vacuum distillation method was employed to ensure safe handling. The process utilized distinct volatilization and condensation properties of the slag components. First, vacuum pump oil was distilled and recovered at a temperature of 300 °C under a pressure of 10 Pa. Second, at 700 °C, metallic lithium was volatilized and subsequently collected on a condenser. This approach achieved effective separation and recovery of valuable elements. Infrared spectra analysis of the oil extracted from lithium slag before and after distillation revealed significant similarity, thereby validating its successful recycling and reuse. Additionally, the collected metallic lithium achieved a purity level of ˃ 98 %. Computational analysis using Fluent software accurately predicted the condensation temperature and metallic lithium volume as well as oil under low-pressure and high-temperature conditions, thereby correlating with experimental results. Subsequent industrial-scale experiments conducted at a 5 kg level demonstrated the efficient and clean recovery of both metallic lithium and oil.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"49 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035168","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}

引用次数: 0

A conical array water evaporator with anti-biofouling, salt-rejecting and anti-polyelectrolyte effect for efficient solar energy-driven seawater desalination

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131816

Zhong-Yi Wang, Ying-Jie Zhu, Yu-Qiao Chen, Han-Ping Yu, Zhi-Chao Xiong

{"title":"A conical array water evaporator with anti-biofouling, salt-rejecting and anti-polyelectrolyte effect for efficient solar energy-driven seawater desalination","authors":"Zhong-Yi Wang, Ying-Jie Zhu, Yu-Qiao Chen, Han-Ping Yu, Zhi-Chao Xiong","doi":"10.1016/j.seppur.2025.131816","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131816","url":null,"abstract":"Solar energy-driven water evaporation technology is a sustainable access to obtain clean water from natural seawater to tackle severe freshwater shortage worldwide. Several challenges including salt accumulation and biological contamination still exist, which cause insufficient water supply, low light absorption efficiency and thus reduced water evaporation rate. Herein, a high-performance conical array water evaporator with anti-biofouling, low water evaporation enthalpy, salt-rejecting and anti-polyelectrolyte effect has been developed for efficient solar energy-driven stable seawater desalination. The as-prepared conical array solar water evaporator is composed of phothothermal MXene/bismuth sulfide, thermally insulating ultralong hydroxyapatite nanowires, and hydrophilic polyvinyl alcohol and polymerized N-(3-sulfopropyl)-N-methacryloxyethyl-N,N-dimethylammonium betaine, which combine merits of high light absorption and energy efficiency, efficient photothermal conversion, low evaporation enthalpy, rapid water transportation, and superior water evaporation performance. The conical array solar water evaporator demonstrates a high water evaporation rate of 2.54 kg m−2 h−1 and superior energy efficiency of 106.78 % under one sun illumination (1 kW m−2). Moreover, the conical array solar water evaporator exhibits good resistance to both biofouling and bacterial adhesion. This research provides a new strategy for designing solar water evaporators with multiple functions and advances their applications in seawater desalination and wastewater treatment.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"58 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035170","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}

引用次数: 0

Synthesis and optimization of dividing-wall distillation columns for the separation of a quaternary mixture

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131817

Monserrat Flores-Flores, Fernando Israel Gómez-Castro, Claudia Gutiérrez-Antonio, Araceli Guadalupe Romero-Izquierdo, Carlos Eduardo Guzmán-Martínez, Salvador Hernández, Massimiliano Errico

{"title":"Synthesis and optimization of dividing-wall distillation columns for the separation of a quaternary mixture","authors":"Monserrat Flores-Flores, Fernando Israel Gómez-Castro, Claudia Gutiérrez-Antonio, Araceli Guadalupe Romero-Izquierdo, Carlos Eduardo Guzmán-Martínez, Salvador Hernández, Massimiliano Errico","doi":"10.1016/j.seppur.2025.131817","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131817","url":null,"abstract":"Notwithstanding its low thermodynamic efficiency, distillation is among the most used separation processes in industry. As a consequence of the high energy consumption and the related environmental impact the research of more efficient alternatives remains one of the main interests in process engineering. Dividing-wall configurations are a well-known alternative to reduce the energy requirement of ternary distillation. Nevertheless, the design of dividing-wall columns for the separation of quaternary mixtures represents a challenge due to the number of possible configurations. In this work, a synthesis and design procedure is proposed for a double dividing-wall structure to separate quaternary mixtures. The performance of the intensified scheme is analyzed in terms of energy requirements, total annual cost, CO2 emissions and thermodynamic efficiency. Due to the complexity of the system, after initial synthesis the structure is optimized through a meta-heuristic approach. The direct synthesis procedure leads to a dividing-wall system with higher energy requirements than the conventional sequences. However, after the rigorous optimization, savings in reboiler duty of 14.3% are obtained, with a reduction in TAC of 6.3%.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"4 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044589","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}

引用次数: 0

Additive promoted supported mixed amines on mesoporous silica for cyclic capture of carbon dioxide

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131824

Xiaoyu Li, Xueqi Zhao, Yao Meng, Haiyang Xue, Jie Chen, Kang Peng

{"title":"Additive promoted supported mixed amines on mesoporous silica for cyclic capture of carbon dioxide","authors":"Xiaoyu Li, Xueqi Zhao, Yao Meng, Haiyang Xue, Jie Chen, Kang Peng","doi":"10.1016/j.seppur.2025.131824","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131824","url":null,"abstract":"Blending two amines has recently been developed as an efficient strategy to improve the post-combustion CO2 capture performance of amine-functionalized mesoporous materials. The mixed two amine species of polyethyleneimine (PEI) and diethanolamine (DEA) can help to overcome the problems of intrinsic large viscosity, easy aggregation and low amine efficiency of the polyamine. In this study, a novel additive promoted supported mixed amines on mesoporous silica were successfully synthesized via a facile and efficient wet impregnation route. The adsorption performance of PEI and DEA individually loaded onto Al-MCM-41 was tested at 75 °C in a flow of 60 vol% CO2/40 vol% N2, leading to the identification of an optimal mixed amine loading of 50 %. The supported mixed amines system was further evaluated based on amine efficiency, adsorption capacity, kinetics and stability. The optimal adsorbent loaded with 30 wt% PEI and 20 wt% DEA exhibits a maximum CO2 uptake of 3.53 mmol/g at 75 °C and stable cyclic stability with an average 1.93 % decay per cycle, due to the synergistic effect of both amines. The DEA with hydroxyl groups was introduced into PEI and co-impregnated within mesoporous silica can overcome the poor mass transfer of PEI, the limited stability of DEA and low adsorption capacity of Al-MCM-41. The synergistic combination of PEI and DEA is able to provide abundant CO2 affinity sites and create extra CO2 transfer pathways for effectively reducing the internal CO2 diffusion resistance, by which the diffusion limitation of CO2 in the deeper PEI films can be alleviated due to the interactions between PEI and DEA. As a result, the final mixed amine-functionalized adsorbents have excellent cyclic CO2 uptake capacity, rapid kinetics and stability. This approach holds significant promise for environmentally friendly, cost-efficient, and large-scale applications in CO2 capture and separation.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"45 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035169","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}

引用次数: 0

Enhanced adsorption for aqueous lead (Ⅱ) by red mud-modified biochar via microwave-assisted hydrothermal carbonization and K2CO3 activation: Performance and mechanism

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131825

Baofeng Wang, Yaxin Guo, Yunxiao Chen, Mukun Xue, Xutao Song, Yanxia Guo, Fangqin Cheng

{"title":"Enhanced adsorption for aqueous lead (Ⅱ) by red mud-modified biochar via microwave-assisted hydrothermal carbonization and K2CO3 activation: Performance and mechanism","authors":"Baofeng Wang, Yaxin Guo, Yunxiao Chen, Mukun Xue, Xutao Song, Yanxia Guo, Fangqin Cheng","doi":"10.1016/j.seppur.2025.131825","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131825","url":null,"abstract":"In this study, red mud-modified biochar (AMHC) derived from low-cost corncob (CC) and red mud (RM) was successfully prepared by microwave-assisted hydrothermal carbonization (MHTC) and K2CO3 activation. The effect of RM and K2CO3 activation on the characteristics of AMHC for lead (Pb) (II) was innovatively investigated. The results showed that adding RM could promote the characteristics of AMHC obviously, and when the mass ratio of CC to RM was 8:2, AMHC exhibited the highest special surface area of 591.91 m2/g and the highest total pore volume of 0.49 cm3/g. And when the mass ratio of CC to RM was 5:5 (AMHC-C5R5), AMHC exhibited the highest magnetic strength of 30.85 emu/g, which was beneficial for separating of them from aqueous solutions by magnetic separation. Moreover, the results of batch adsorption experiment also showed that AMHC-C5R5 exhibited a maximum adsorption capacity of 350.28 mg/g at 45 °C, and this process was dominated by chemisorption. Interestingly, for AMHC without added RM, the adsorption process was non-spontaneous when the initial concentration of Pb (II) exceeded 200 mg/L, while for AMHC-C5R5, the adsorption was still spontaneous until the initial concentration of Pb (II) reach 500 mg/L. Furthermore, the results also indicated that –COOH, –OH, Fe3O4 and Fe2O3 on the surface of AMHC could promote electrostatic adsorption between Pb (II) and AMHC. And the adsorption mechanisms included not only ion exchange and electrostatic interaction, but also precipitation, complexation, and pore filling as well.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"22 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044811","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}

引用次数: 0

A novel calcination-quenching synthesis of octahedral MgO crystals with highly exposed (111) facets for enhanced adsorption performance

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131800

Yahui Feng, Tingshan Xie, Wenjun Gong, Jie Xu, Yunhua Lu, Li Gao, Shiai Xu, Bingxin Liu

{"title":"A novel calcination-quenching synthesis of octahedral MgO crystals with highly exposed (111) facets for enhanced adsorption performance","authors":"Yahui Feng, Tingshan Xie, Wenjun Gong, Jie Xu, Yunhua Lu, Li Gao, Shiai Xu, Bingxin Liu","doi":"10.1016/j.seppur.2025.131800","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131800","url":null,"abstract":"The improvement of the CO2 adsorption capacity of MgO is necessary for carbon capture. The (111) facet of MgO has garnered considerable attention recently due to its distinctive atomic arrangement of oxygen and magnesium. Theoretically, the (111) facet exposes a high density of low-coordination oxygen anions on MgO, thereby providing abundant active sites for CO2 adsorption. However, the controlled synthesis of MgO crystals with highly exposed (111) facets remains a significant challenge. In this study, a facile calcination-quenching method was developed to synthesize octahedral MgO crystals with preferentially exposed (111) facets. The effects of calcination temperature, calcination time, and cooling rate on the morphological evolution of MgO crystals were systematically investigated by using anhydrous magnesium carbonate (MgCO3) as the precursor. X-ray diffraction (XRD) results indicated that the octahedral MgO crystals preferentially expose (111) facets compared to other morphologies. Thermogravimetric analysis (TGA) reveals that the octahedral MgO exhibits superior CO2 adsorption capacity of 2.15 mmol/g at 50 °C. This value represents enhancements of 525.0 %, 161.5 %, and 144.8 % compared to commercial MgO, flat-surfaced MgO, and spherical MgO, respectively. The fundamental reasons for the superior CO2 adsorption capability of the MgO (111) facet were elucidated through in situ DRIFTS, CO2-TPD, and DFT calculations. The presence of unique low-coordinated oxygen anions on the MgO (111) facet results in enhanced Lewis basicity, thereby exhibiting a stronger binding affinity towards CO2 compared to other facets of MgO. This study provides new insights for synthesizing MgO crystals with highly (111) facets and enhanced CO2 capture capabilities.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"3 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035172","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}

引用次数: 0

A visible light-driven floatable cyclized polyacrylonitrile-based aerogel (CPAN@ZnO-Ag) photocatalyst for sustainable wastewater purification

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131801

Wenjing Song, Taoming Yu, Ye Zhang, Lili Li

{"title":"A visible light-driven floatable cyclized polyacrylonitrile-based aerogel (CPAN@ZnO-Ag) photocatalyst for sustainable wastewater purification","authors":"Wenjing Song, Taoming Yu, Ye Zhang, Lili Li","doi":"10.1016/j.seppur.2025.131801","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131801","url":null,"abstract":"Photocatalysis as an advanced oxidation technology is often used for wastewater treatment, whereas the sustainable photocatalysis is inhibited by the water-induced light attenuation for solar energy utilization efficiency and the insufficient oxygen in water. In this work, CPAN aerogel was used as a substrate. Ag nanoparticles were loaded on the surface of ZnO as inorganic catalysts (ZnO-Ag), and then ZnO-Ag was evenly dispersed in the three-dimensional network structure of CPAN aerogel. In the floatable CPAN@ZnO-Ag photocatalyst, CPAN with the aerogel architecture could continuously transfer pollutants upward to the photocatalyst surface through porous channels of the aerogel, utilizing light and oxygen efficiently. The coupling of ZnO-Ag with CPAN formed a heterojunction in the composite, which improved the carrier separation efficiency of floatable CPAN@ZnO-Ag. Ag as an electron bridge promoted the formation of the Z-Scheme heterojunction, which further improved the performance of photocatalytic removal of pollutants. The results showed that the maximum removal rate of Congo red (CR, 10 mg/L, 50 mL) by CPAN@ZnO-Ag was 98.47 % within 90 min. In particular, without any desorption procedure, the CPAN@ZnO-Ag could achieve continuous and efficient photocatalytic degradation within 450 min through continuous 5 cycles of CR feeding. What’s more, the CPAN@ZnO-Ag also exhibited the versatility to remove antibiotics, heavy metal ions and toxic phenols from water. This work presented a strategy to ingeniously design a floatable aerogel photocatalyst for sustainable photocatalytic treatment of actual wastewater, achieving efficient use of solar energy and energy conservation.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"16 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044588","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}

引用次数: 0

Turn waste to wealth: Modification of coconut shells and waste diatomite from brewery for efficient adsorption of polycyclic aromatic hydrocarbons (PAHs) in seawater

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131818

Zhiyang Lu, Zhuo Chen, Weijun Tian, Chenchen Li, Mengyuan Zou, Ruijuan Zhang, Ke Yang, Mutai Bao

{"title":"Turn waste to wealth: Modification of coconut shells and waste diatomite from brewery for efficient adsorption of polycyclic aromatic hydrocarbons (PAHs) in seawater","authors":"Zhiyang Lu, Zhuo Chen, Weijun Tian, Chenchen Li, Mengyuan Zou, Ruijuan Zhang, Ke Yang, Mutai Bao","doi":"10.1016/j.seppur.2025.131818","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131818","url":null,"abstract":"Polycyclic aromatic hydrocarbons (PAHs) enter marine ecosystems, posing risks to human health and the environment. This study investigated the adsorption properties of phenanthrene (Phe), pyrene (Pyr), and benzo[a]pyrene (BaP) from seawater using an efficient adsorbent made from brewery waste diatomite and coconut shells. The optimal adsorbent was produced by calcining at 700 °C for 2 h with a 4:1 diatomite to coconut shell ratio. Under optimal conditions (0.4 g/L of dosage, pH = 7, salinity = 30, 9 mg/L of dissolved oxygen), removal rates reached 92.81 % for Phe, 96.93 % for Pyr, and 99.48 % for BaP. Adsorption mechanisms were analyzed through kinetics, thermodynamics, and density functional theory, revealing both physical interactions (pore filling, electrostatic interactions, hydrophobic effects) and chemical interactions (π-π interaction, functional group action, complexation reaction). Tests in actual seawater confirmed that the adsorbent effectively captures up to 85 %-95 % of PAHs during sedimentation, sequestering them in the seabed. This work presents a novel, eco-friendly solution for PAHs removal from seawater, contributing to water treatment and resource utilization.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"9 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035174","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}

引用次数: 0

Constructing a cationic porous organic polymer with [PF6]- charge-balanced anion for a rapid, selective and high-capacity thorium capture

IF 8.6 1区工程技术

Separation and Purification Technology Pub Date : 2025-01-26 DOI: 10.1016/j.seppur.2025.131814

Xiaojiang Xu, Yuxuan Liu, Kai Yu, Mingbiao Luo, Feng Luo

{"title":"Constructing a cationic porous organic polymer with [PF6]- charge-balanced anion for a rapid, selective and high-capacity thorium capture","authors":"Xiaojiang Xu, Yuxuan Liu, Kai Yu, Mingbiao Luo, Feng Luo","doi":"10.1016/j.seppur.2025.131814","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.131814","url":null,"abstract":"Thorium, recognized as a strategic resource, holds a significant position in the development and application of future energy sources. However, the currently available thorium is limited, and how to recover thorium from various thorium-containing mineral wastes as well as thorium-containing wastewater for recycling is an urgent problem for researchers. In this paper, we report a cationic porous organic polymer (namely ECUT-POP-34) for the rapid and selective adsorption of thorium from rare earth wastewater. The adsorption equilibrium can be fast finished within two minutes, exceeding almost all reported adsorbents for such use, while its saturated adsorption capacity reaches also as high as 588 mg/g, higher than most reported adsorbents for such use. Especially, in the presence of various rare-earth interfering ions in solution, ECUT-POP-34 also exhibits a high selective adsorption towards Th over these rare-earth ions. In addition, a good reusability is also observed. All these advantages suggest its superior application in recovery of thorium from thorium-containing wastewater. The Th-F coordination interaction derived from the charage-balanced anion of [PF6]- within the channel of material is viewed to contribute the fast, selective, and high-capacity thorium uptake.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"35 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035173","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}

引用次数: 0