Separation and Purification Technology最新文献

{"title":"Chiral electrokinetic chromatography using dual pseudo-stationary phases: SBE-β-CD with hydrophobic (deep) eutectic solvents versus micelles and ionic liquids","authors":"Song Xue ,&nbsp;Yu Xu ,&nbsp;Sihui Ding ,&nbsp;Haoxiang Meng ,&nbsp;Xiaodong Sun ,&nbsp;Qi Zhang","doi":"10.1016/j.seppur.2025.133915","DOIUrl":"10.1016/j.seppur.2025.133915","url":null,"abstract":"<div><div>Two hydrophobic (deep) eutectic solvents (H(D)ESs), menthol:octanoic acid (Men:OctA) and menthol:trioctylphosphine oxide (Men:TOPO), were prepared, characterized, and then employed for the first time in combination with sulfobutylether-β-cyclodextrin (SBE-β-CD) for chiral separations in capillary electrokinetic chromatography (EKC). The “H(D)ES + SBE-β-CD” dual pseudo-stationary phase (PSP) systems yielded not only enhanced enantioselectivities, but also accelerated migrations of primaquine and chlorpheniramine, two drugs that cannot be resolved using the single SBE-β-CD system. The enhancement originated from the combined effects of stereoselective complexation and hydrophobic partitioning involving the H(D)ES phase, which moved faster than the anionic CD phase under the separation conditions. The best results in terms of enantioresolution and migration time were obtained using a 20 mM phosphate buffer (pH 7.0) containing 2.0 % SBE-β-CD and 0.2 % Men:OctA at an applied voltage of 15 kV. We further compared the chiral EKC performance of the H(D)ESs with a series of conventional PSPs, including three micelles (Tween-20, Brij-35, SDS) and three ionic liquids (ILs). The results showed that none of these modifiers could achieve comparable EKC performance, suggesting that in certain cases, H(D)ESs could be a superior alternative to traditional modifiers for chiral EKC separations.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133915"},"PeriodicalIF":8.1,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144237413","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":"Designing one-photon-based heterojunction for superior CO2 photoreduction under visible light","authors":"Rizwan Ullah ,&nbsp;Iftiab Ahammed Sarker ,&nbsp;Mohd Shahbudin Masdar ,&nbsp;Rozan Mohamad Yunus ,&nbsp;Nurul Akidah Baharuddin ,&nbsp;Jawad Ali ,&nbsp;Munir Ahmad ,&nbsp;Muhammad Zahid ,&nbsp;Anadil Gul","doi":"10.1016/j.seppur.2025.133914","DOIUrl":"10.1016/j.seppur.2025.133914","url":null,"abstract":"<div><div>An innovative one-photon-based heterojunctions, designed by integrating doping and heterostructure strategies to enhance photocatalytic efficiency, is reviewed. Fe (iron) incorporation into Bi₂WO₆ (BWO) reduces the energy bandgap, thereby extending light absorption to longer wavelengths and suppressing charge recombination. Additionally, defect-rich MoS₂ with an aligned bandgap was synthesized and loaded to construct an effective reduction heterojunction, triggered by one photon. The synthesized heterojunction exhibits direct interfacial chemical interactions between Fe and MoS₂ atoms, significantly enhancing charge carrier dynamics. The surface defects on MoS₂ act as active centers for CO₂ molecule activation, demonstrating highly efficient CO₂ photoreduction activity. Notably, the heterojunction achieves CH₄ (CO) yields that are 3.2 (3.7) and 2.1 (2.9) times greater than MoS₂ and Fe@BWO, respectively, demonstrating its synergistic efficiency. In-situ XPS and in-situ EPR analyses reveal intriguing insights into the charge transfer pathway, suggesting a heterojunction mechanism with distinct interfacial interactions that align with advanced photocatalytic charge dynamics. This study establishes a promising platform for advancing redox heterojunction materials and provides valuable insights into optimizing redox properties and charge dynamics for the design of next-generation semiconductor photocatalysts with enhanced efficiency and sustainability. Hence, offering strong potential for integration into photocatalytic fuel cells application and other solar-driven energy conversion technologies.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133914"},"PeriodicalIF":8.1,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241895","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":"Exploring electrodialysis membrane technology for the purification of biosurfactant extracts and recovery of lactic acid from corn steep water","authors":"X. Vecino ,&nbsp;A. Martínez-Arcos ,&nbsp;J.M. Cruz ,&nbsp;A.B. Moldes ,&nbsp;J.L. Cortina ,&nbsp;M. Reig","doi":"10.1016/j.seppur.2025.133889","DOIUrl":"10.1016/j.seppur.2025.133889","url":null,"abstract":"<div><div>Corn steep water (CSW) is an agri-food byproduct from the corn industry that contains valuable biocompounds, such as biosurfactants (BS) and lactic acid (LA), which are of industrial interest to be recovered. In this work, electrodialysis (ED) is presented as a promising technique for simultaneously purifying BS and recovering LA. Indeed, ED has already been used for LA recovery, but there is a lack of research regarding its application for BS purification. More precisely, this work investigates the purification of BS from CSW using electrodialysis systems, obtaining a LA-rich stream as a byproduct. For that, different ED operational parameters were studied: pH, cell pairs, and membrane type. Finally, ED with bipolar membranes (EDBM) was tested for further purification of biosurfactant extract. Results showed that the optimal conditions were achieved with CSW unmodified pH (4.5), 6 cell pairs and standard membranes. Under the ED optimum conditions, biosurfactants in CSW were concentrated 2 times based on their relative abundance, whereas EDBM tests showed production of LA in the acid stream and KOH in the basic stream, with concentration factors around 2 and 4, respectively. Overall, this study showcased that ED is efficient for the purification of biosurfactants, yielding an extract able to reduce the surface tension of water up to 54.9 ± 0.7 mN/m with a critical micelle concentration (CMC) of 0.18 ± 0.01 g/L, improving by 3.5-folds. Furthermore, the simultaneous recovery of organic acids from CSW, such as LA, paves the way for more sustainable and environmentally friendly processing methods.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133889"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241268","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":"3D nested solar evaporator based on CuO MF/OH-MWCNT for high-efficient desalination of seawater","authors":"Yue Hou ,&nbsp;Zhiping Zhang ,&nbsp;Jinlei Cha ,&nbsp;Shunyu Han ,&nbsp;Zhenxing Yin","doi":"10.1016/j.seppur.2025.133905","DOIUrl":"10.1016/j.seppur.2025.133905","url":null,"abstract":"<div><div>Continuing climate deterioration and accelerated population growth are creating unprecedented pressure on limited freshwater supplies. The development of efficient and stable solar desalination devices is emerging as an effective way to alleviate this crisis and ensure a sustainable water supply. In this study, a 3D nested evaporator composed of CuO microflowers (CuO MFs) and hydroxylated multi-walled carbon nanotubes (OH-MWCNTs) integrated into air-calcined melamine sponge (AMS) was designed for solar desalination. The innovative structure of the evaporator not only enhances water transfer capacity but also minimizes heat loss. Among them, AMS acts as the matrix skeleton that provides structural support and possesses great photothermal conversion performance. Because of the unique micro-nano hierarchical structure and the synergistic photothermal effect of CuO MF/OH-MWCNT, the evaporator demonstrates remarkable evaporation performance and salt resistance, achieving an evaporation rate of 4.25 kg∙m⁻²∙h⁻¹ and an efficiency of 180.76 % under standard solar illumination (1 kW∙m⁻²). Additionally, the evaporator exhibits excellent self-cleaning capabilities and long-term stability, maintaining consistent performance across various complex environments. This study contributes to the development of sustainable water treatment technologies and provides a feasible approach to constructing high-performance solar vapor generation devices.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133905"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241894","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":"Investigation of perfluorooctanoic acid and perfluorooctane sulfonate adsorption by Ca- and Fe-modified biochars: Potential of Ca-modified biochar in real water matrices","authors":"Kyeong Hwan Kang ,&nbsp;Changgil Son ,&nbsp;Sungjun Bae ,&nbsp;Kangmin Chon ,&nbsp;Young Mo Kim","doi":"10.1016/j.seppur.2025.133906","DOIUrl":"10.1016/j.seppur.2025.133906","url":null,"abstract":"<div><div>Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are persistent organic pollutants widely found in water matrices and pose significant ecological and health risks. This study investigated the adsorption behaviors and mechanisms of calcium- and iron-modified biochars (CMB and IMB) fabricated from mandarin peel and focused on their applicability in real water matrices. CMB and IMB exhibited markedly enhanced adsorption capacity compared to unmodified biochar (MB), contributed to improved electrostatic attraction and ion and ligand exchange across a broad pH range. In real water matrices, IMB demonstrated superior efficiency in simpler matrices like tap water, while CMB showed better performance in more complex environments such as river water and sewage treatment effluent. These results were attributed to the competitive adsorption of PFOA and PFOS onto IMB in the presence of coexisting ions and humic acids compared to CMB. A quadratic regression model successfully predicted adsorption capacities under various water conditions, supporting its effective use in real water matrices. This study highlighted the potential of modifying CMB and IMB for the removal of PFOA and PFOS by demonstrating their effectiveness in complex or simple water matrices and further emphasized that Ca-modified biochar is particularly promising under more complex water environmental conditions.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133906"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241269","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":"Synthesis of a demulsifier with concentrated hydrogen bonding sites and its demulsification mechanism","authors":"Zhoucheng Li ,&nbsp;Zhutao Luo ,&nbsp;Wentao Ma ,&nbsp;Yu Ding ,&nbsp;Baiyun Jin ,&nbsp;Yajun Zhao ,&nbsp;Lingrui Chen ,&nbsp;Yuanzhu Mi ,&nbsp;Weichu Yu","doi":"10.1016/j.seppur.2025.133888","DOIUrl":"10.1016/j.seppur.2025.133888","url":null,"abstract":"<div><div>The role of non-covalent interactions in the demulsification process is widely recognized, and the incorporation of flexible chains alongside hydrogen bond donor sites significantly amplifies this effect. In the current work, a demulsifier (DEE-8) has been synthesized that contains two flexible hydrophobic long chains and multiple hydrogen bond sites with relatively clustered heteroatoms. The chemical structure of DEE-8 was characterized using Fourier Transform Infrared Spectroscopy (FT-IR) and Proton Nuclear Magnetic Resonance (¹H NMR) techniques. The demulsification efficacy (DE) was evaluated employing the bottle test methodology. A comprehensive investigation was conducted to assess the effects of various parameters-including concentration, temperature, settling time, pH, and salinity-on the DE of DEE-8. Notably, at a concentration of 250 mg/L, the DE reached 98.6 % within 70 min at a temperature of 40 °C. Furthermore, DEE-8 exhibited outstanding demulsification capabilities across a broad pH range of 4 to 12 and under conditions of elevated salinity. The competitive adsorption between asphaltenes and DEE-8 at the oil-water interface (OWIF) were analyzed through interfacial tension measurements and three-phase contact angle evaluations. In addition, the effect of DEE-8 on the strength of the interfacial film was studied by the droplet coalescence time. Based on previous trials, a possible demulsification mechanism was proposed. The results indicated that the hydrogen bonding sites, such as –OH and amino groups, along with the two hydrophobic long chains present in DEE-8, enhanced the interfacial activity of DEE-8. This enhancement facilitates the spontaneous migration and penetration of DEE-8 into the interfacial membrane, effectively disrupting the interfacial membrane established by asphaltenes. Consequently, this disruption promotes efficient oil-water separation in emulsions.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133888"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241039","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":"Polycarbosilane-Derived porous ceramic thin membranes with enhanced mechanical strength and Tunable crystal structures for oily wastewater treatment","authors":"Jiaming Zhu ,&nbsp;Di Zhang ,&nbsp;Qinghai Yu ,&nbsp;Liang Yu ,&nbsp;Huaizhu Liu ,&nbsp;Shiyu Yu ,&nbsp;El–Gendi Ayman ,&nbsp;Yunxia Hu ,&nbsp;Genghao Gong","doi":"10.1016/j.seppur.2025.133898","DOIUrl":"10.1016/j.seppur.2025.133898","url":null,"abstract":"<div><div>Porous ceramic membranes possess significant potential for wastewater treatment, with their performance largely determined by material composition and structure attributes. In this study, thin porous ceramic membranes with varying crystal types—amorphous SiO₂/Al₂O₃, cristobalite/Al₂O₃ and mullite/Al₂O₃—were developed using Al₂O₃, polycarbosilane (PCS) and polysulfone (PSf) via phase inversion-sintering process. As a polymeric precursor, PCS was effectively dispersed among Al₂O₃ particles through co-phase inversion with PSf. Subsequent sintering at different temperatures transformed PCS into ceramic material with distinct crystal structures, imparting unique properties to the membranes. This work systematically explored the crystal evolution process, morphological structure, and mechanical strength of these ceramic membranes. The membranes exhibited high porosity (56–73.5 %) and crushing strength (5.2–38.2 MPa), along with adjustable pore sizes (250–90 nm) and a narrow pore size distribution. Furthermore, the filtration performance of the membranes was evaluated for the separation of a 1000 mg/L oil-in-water (O/W) emulsion, achieving high and stable O/W emulsion permeance (1327–1967 LMH/bar) and excellent oil rejection (97.3–99.4 %). Additionally, the membranes demonstrated outstanding anti-fouling properties, with a flux recovery rate of 90.8 % achieved through simple chemical cleaning.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133898"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241004","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":"Formulation engineering of soybean-based green solvent enables highly efficient CO2 capture performance","authors":"Wenqiang Xu ,&nbsp;Pengfei Liu ,&nbsp;Lingbo Hu ,&nbsp;Yutong Zhang ,&nbsp;Pri Januar Gusnawan ,&nbsp;Jianjia Yu ,&nbsp;Lusi Zou","doi":"10.1016/j.seppur.2025.133872","DOIUrl":"10.1016/j.seppur.2025.133872","url":null,"abstract":"<div><div>The soybean-based (SBB) solvent, derived from renewable feedstocks, exhibits significant potential for CO₂ chemisorption due to its sustainability, non-toxicity, biodegradability, and low regeneration energy consumption. However, the practical application of unrefined SBB at high concentrations is limited by its high content of low-reactive components (e.g., acidic and low-solubility amino acids). To address this limitation, we developed an isoelectric precipitation-based formulation engineering strategy to enhance the CO₂ capture performance of this absorbent. By selectively removing amino acids through pH-controlled precipitation, the concentration of active amino acids in the optimized solvent (SBB-M) increased by over 60 %, enabling its use at a refined and relatively high concentration (∼3 M). And the absorption capacity of the SBB-M solution has significantly increased by 16.6 times compared with that of the SBB solvent. Kinetic analysis revealed a reaction order of 1.68–1.8 and average activation energy of 24.7 kJ·mol⁻¹ for the CO₂ absorption into SBB-M aqueous solution, indicating efficient chemisorption ability. Remarkably, the regeneration energy of 3 M SBB-M was only 1.98 GJ·ton⁻¹ CO₂, approximately 48 % of that required for 5 M monoethanolamine (MEA), underscoring its energy-saving superiority. This formulation engineering of SBB represents a breakthrough in developing sustainable amino acid solvents for cost-effective and scalable carbon capture.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133872"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241265","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":"Diverse effects of concomitant ions on copper and arsenic separation from copper electrolyte purification solutions by sulfide precipitation: thermodynamic, kinetic and mechanistic investigations","authors":"Hao Jin ,&nbsp;Yong Liu ,&nbsp;Linhua Jiang ,&nbsp;Ning Duan ,&nbsp;Jinyu Wang ,&nbsp;Xiaolu Sun ,&nbsp;Shaoshuai Sheng ,&nbsp;Guangbin Zhu ,&nbsp;Weidong Li","doi":"10.1016/j.seppur.2025.133880","DOIUrl":"10.1016/j.seppur.2025.133880","url":null,"abstract":"<div><div>Targeted recovery of copper (Cu) from arsenic(As)-containing wastewater has been a long-standing challenge in the Cu smelting industry. Multi-stage sulfide precipitation can selectively separate Cu from Cu electrolyte purification solutions. However, the effects of concomitant ions on the separation have not been well-understood. Against this background, the sulfide precipitation behaviors of various heavy metals under acidic conditions were studied. The solubility product constant (<em>K</em>sp) value of metal sulfides (Me<em>_n</em>S<em>_m</em>) and acidity significantly affect the precipitation. In the presence of Cl^-/F^-, the formation of metal–ligand complexation exhibits divergent effects on metal precipitation. Specifically, Cl^- markedly decreases the precipitation of most metals (except Cu²⁺ and As species). Conversely, F^- increases the precipitation of Bi³⁺, Cd²⁺, Fe²⁺, Ni²⁺, Co²⁺, and In³⁺, but decreases that of Sb³⁺, Sn²⁺, Cu²⁺ and As species. Thermodynamically, the formation of stable <span><math><mrow><msubsup><mtext>MeCl</mtext><mi>i</mi><mrow><mi>n</mi><mo>-</mo><mi>i</mi></mrow></msubsup></mrow></math></span>/<span><math><mrow><msubsup><mtext>MeF</mtext><mi>i</mi><mrow><mi>n</mi><mo>-</mo><mi>i</mi></mrow></msubsup></mrow></math></span> promotes the Me<em>_n</em>S<em>_m</em> dissolution and elevates the critical pH for metal precipitation. Furthermore, the competitive ability of concomitant heavy metals for H₂S follows the order: Bi³⁺ &gt;Sb³⁺ &gt;Cu²⁺ &gt;As(III) &gt; Cd²⁺ &gt;Sn²⁺ &gt;As(V) &gt; In³⁺ &gt;Zn²⁺ &gt;Ni²⁺ &gt;Co²⁺ &gt;Fe²⁺. Significantly, the concomitant heavy metals in actual solutions reduce the As precipitation into Cu slags and enhance the Cu-As(V) separation. At a Cu-As(V)-Me<em>ⁿ</em>⁺ concentration of 5–5–1 g/L, Cd²⁺ and Zn²⁺ decrease As(V) precipitation by 2.75 % and 1.47 %, respectively. Kinetically, precisely regulating the reaction time can effectively minimize the co-precipitation of As with Cu and reduce the consumption of sulfide agent. These findings have significant implications for aqueous Cu-As(V) separation and valuable metals recycling from wastewater.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133880"},"PeriodicalIF":8.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241264","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":"Modulated electronic structure and directed charge transfer in CuCo-CdS/C for enhanced photocatalytic CO2 reduction","authors":"Lixiao Zheng,&nbsp;Xinyan Deng,&nbsp;Zichao Yang,&nbsp;Huayong Yang,&nbsp;Min Zhang,&nbsp;Zhongjie Guan,&nbsp;Taifeng Liu,&nbsp;Jianjun Yang","doi":"10.1016/j.seppur.2025.133850","DOIUrl":"10.1016/j.seppur.2025.133850","url":null,"abstract":"<div><div>Carbon dioxide (CO₂) photoreduction has aroused great interest. However, the photocatalysts for CO₂ photoreduction still face challenges of low catalytic efficiency and poor stability. Although the charge transfer in the catalyst can promote the charge redistribution and the activation of CO₂ molecules thereby improving the CO₂ photoreduction efficiency, the charge transfer mechanism, depending on the element, the coordination environment, the substrate type, and active atomic space, is very complex. In this study, photocatalysts made of CdS and CuCo heteroatom-doped carbon (CuCo-CdS/C) were synthesized with a metal–organic framework as the precursor. The catalytic performance of the synthesized CuCo-CdS/C catalysts for CO₂ photoreduction was evaluated; and their photocatalytic mechanism was examined by means of density functional theory computations, in situ X-ray photoelectron spectroscopy, and in situ diffused reflectance infrared fourier transform spectroscopy. The experimental results show that CuCo-CdS/C has strong catalytic activity and good stability towards CO₂ photoreduction, providing CO yield of 63.34 µmol g⁻¹h⁻¹ which remains nearly unchanged after 5 cycle of reuse. This is closely related to photocatalytic mechanism associated with light-generated electron/hole redistribution on the photocatalyst surface. Namely, CdS attracts electrons from CuCo diatom and accumulates electrons to form the electron-rich active sites for CO₂ photoreduction. At the same time, the <em>d</em>-band center of the catalyst shifts upward to significantly enhance photocatalytic CO₂ reduction. This approach, hopefully, is to provide new insights into the design of highly active and efficient photocatalytic systems for CO₂ photoreduction.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"376 ","pages":"Article 133850"},"PeriodicalIF":8.1,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241946","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}