Journal of Colloid and Interface Science最新文献

{"title":"Versatile spiky spindle-shaped copper-based nanocomposites: A SERS substrate for discrimination, quantification and inactivation of multiple bacteria","authors":"Zimin Gu ,&nbsp;Tingting Chen ,&nbsp;Duntao Zu ,&nbsp;Annan Yang ,&nbsp;Weicheng Huang ,&nbsp;Yinbing Wu ,&nbsp;Yuhui Gan ,&nbsp;Honglin Chen ,&nbsp;Jianni Yang ,&nbsp;Xin Yu ,&nbsp;Juntao Xie ,&nbsp;Huaihong Cai ,&nbsp;Pinghua Sun ,&nbsp;Haibo Zhou ,&nbsp;Junxia Zheng","doi":"10.1016/j.jcis.2025.137448","DOIUrl":"10.1016/j.jcis.2025.137448","url":null,"abstract":"<div><div>Designing a multi-functional strategy that integrates rapid and sensitive detection of pathogenic bacteria and efficient antibacterial activity is of great significance. Here, we reported a smart triple-functional spindle shape copper-based nanocomposites, obtaining the remarkable surface-enhanced Raman scattering (SERS) enhancement, and its spikes at both ends with physical piercing ability cooperate with Ag⁺ and Cu²⁺ releasing capability endowed it with robust antibacterial effectiveness. Originally, gold-core silver-shell nanoparticles (Au@Ag NPs) with excellent SERS performance were loaded onto the spindle shape copper-methylimidazole nanoparticles (Cu-MIM) under electrostatic action, obtaining Au@Ag/Cu-MIM nanocomposites. The SERS sandwich nanostructure bacteria/4-mercaptophenylboronic acid (4-MPBA)/Au@Ag/Cu-MIM was fabricated utilizing the unique bacterial “fingerprints” generated through the introduction of bifunctional 4-MPBA, which served as both a SERS label and internal standard. Two different bacteria (<em>E. coli</em> and <em>S. aureus</em>) were highly sensitively discriminated and quantified in the concentration range spanning from 10¹ to 10⁷ CFU mL⁻¹, with a limit of detection (LOD) of 10 CFU mL⁻¹. The SERS probe under investigation demonstrated its efficacy in human blood samples, exhibiting sensitive discrimination of various bacteria. Meanwhile, 40 μg/mL Au@Ag/Cu-MIM exhibited extraordinary antibacterial activity, the survival rate of <em>S. aureus</em> was 0.15 %, while <em>E. coli</em> was 0.8 %. Furthermore, Au@Ag/Cu-MIM effectively destroyed biofilm, reducing its content to 30 % of the control group after 3 h of treatment. Our work successfully integrated triple-function, which includes specific discrimination, sensitive quantification, and inactivation of multiple bacteria.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137448"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced oxygen evolution reaction performance of Cr-CoFe-layered double hydroxide via the synergistic roles of Fe etching, Cr doping, and anion intercalation","authors":"Shuo Liu ,&nbsp;Yufan Zhang ,&nbsp;Lin Hao ,&nbsp;Wei Shen ,&nbsp;Anaclet Nsabimana ,&nbsp;Shigang Shen","doi":"10.1016/j.jcis.2025.137449","DOIUrl":"10.1016/j.jcis.2025.137449","url":null,"abstract":"<div><div>The development of cost-effective and efficient electrocatalysts for water electrolysis is crucial for sustainable hydrogen production. In this study, we designed a hierarchical Cr-CoFe-LDH composite using a tailored etching and doping strategy to enhance catalytic performance. By integrating mesoporous CoFe-LDH layers with C₂O₄²⁻ anions and Cr dopants, we engineered a structure that optimizes mass transport, strengthens electronic interactions at active sites, and stabilizes key catalytic species. In situ spectroscopic analysis provided direct evidence of active species evolution, offering insights into the underlying reaction mechanisms. As a result, the Cr-CoFe-LDH catalyst exhibited excellent oxygen evolution reaction (OER) activity, demonstrating enhanced intrinsic performance and long-term stability. This work presents a novel approach to designing high-performance LDH-based catalysts and advances the understanding of active site modulation for efficient water electrolysis.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137449"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cobalt-glycerolates derived Co@C-T catalysts for the catalytic transfer hydrodeoxygenation of lignin-derived vanillin","authors":"Fei Ge ,&nbsp;Peng Liu ,&nbsp;Wenlin Xu ,&nbsp;Jianchun Jiang ,&nbsp;Minghao Zhou","doi":"10.1016/j.jcis.2025.137444","DOIUrl":"10.1016/j.jcis.2025.137444","url":null,"abstract":"<div><div>The hydrodeoxygenation of lignin-derived bio-oil is the key to its upgrading into biofuels. Currently, the catalytic transfer hydrodeoxygenation (CTHDO) has been widely studied due to the avoidance of the use of hydrogen gas. In this work, cobalt-glycerolates nanospheres derived Co@C-T catalysts were synthesized via the solvothermal method, followed by the carbothermic method at different calcination temperatures in a nitrogen atmosphere. The obtained Co@C-450 catalyst exhibited the best vanillin CTHDO performance and afforded nearly 100 % conversion of vanillin and 87 % yield of 2-methoxy-4-methylphenol (MMP) under the conditions of 140 °C, 1 MPa N₂ and 3 h using isopropanol as H-donor. Based on the various characterizations, the Co@C-450 catalyst possessed the appropriate metallic Co⁰ sites, acid sites (Co(II)), and carbon defects, and the high catalytic activity was attributed to the synergistic effects of them. During the CTHDO process, the Co⁰ sites were responsible for carbonyl hydrogenation of vanillin to generate 4-(hydroxymethyl)-2-methoxyphenol (HMP) and the generation of active hydrogen species from isopropanol, while the acid sites (Co(II)) were responsible for the cleavage of the C<img>O bond in HMP to form MMP. In addition, the Co@C-450 catalyst had good applicability to other lignin-derived monomers, and its performance did not decrease after 11 runs. This work could provide some insights for upgrading bio-oil.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137444"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A trifunctional surface ligand-directed general synthesis of 2D MOF hybrid nanozymes for customizable applications","authors":"Wenyu Yang ,&nbsp;Mingbo Yang ,&nbsp;Lingzhi Li ,&nbsp;Siyuan Feng ,&nbsp;Jiafan Wu ,&nbsp;Na Du ,&nbsp;Zinuo Shen ,&nbsp;Tao Li ,&nbsp;Zheyu Li ,&nbsp;Ying Li ,&nbsp;Zhihao Li","doi":"10.1016/j.jcis.2025.137453","DOIUrl":"10.1016/j.jcis.2025.137453","url":null,"abstract":"<div><div>Two-dimensional metal–organic frameworks (2DMOFs)-based hybrid nanozymes integrate the excellent catalytic activity of 2DMOFs with intriguing properties of other functional nanomaterials, offering great opportunities in biosensing and catalysis applications. However, the versatile synthesis of 2DMOF-based hybrid nanozymes remains challenging due to the difficulty in precisely controlling interactions between 2DMOFs and other functional nanocomponents. In this work, a trifunctional surface ligand-mediated strategy was developed to rationalize these interactions and promote the general synthesis of 2DMOF hybrid nanozymes. The surface ligand not only prevents the nanocomponents from self-aggregation and keeps 2DMOF monodispersed to form ultrathin nanosheets, but also drives the assembly of 2DMOF and nanocomponent to form composite nanostructures. Using this strategy, a series of customizable hybrid nanozymes exhibiting synergistically catalytic activity, recyclability, cascade catalysis, and photo-enhanced catalysis were fabricated, respectively. Moreover, these hybrid nanozymes displayed excellent performance in H₂O₂ detection, glucose sensing, and pollutant degradation. The successful demonstration of a general and facile strategy for synthesizing two-dimensional metal–organic framework (2D MOF) hybrid nanozymes paves the way for the development of 2D MOF-based nanomaterials and nanozymes with customizable functions. These materials hold significant potential in various applications, including catalysis, biosensing, disease diagnosis, and energy conversion.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137453"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The potential of metal–organic framework MIL-101(Al)–NH2 in the forefront of antiviral protection of cells via interaction with SARS-CoV-2 spike RBD protein and their antibacterial action mediated with hypericin and photodynamic treatment","authors":"Veronika Huntošová ,&nbsp;Anass Benziane ,&nbsp;Luboš Zauška ,&nbsp;Luboš Ambro ,&nbsp;Soňa Olejárová ,&nbsp;Jaroslava Joniová ,&nbsp;Nina Hlávková ,&nbsp;Georges Wagnières ,&nbsp;Gabriela Zelenková ,&nbsp;Pavel Diko ,&nbsp;Jozef Bednarčík ,&nbsp;Florina Zákány ,&nbsp;Tamás Kovács ,&nbsp;Erik Sedlák ,&nbsp;György Vámosi ,&nbsp;Miroslav Almáši","doi":"10.1016/j.jcis.2025.137454","DOIUrl":"10.1016/j.jcis.2025.137454","url":null,"abstract":"<div><div>The global pandemic of SARS-CoV-2 has highlighted the necessity for innovative therapeutic solutions. This research presents a new formulation utilising the metal–organic framework MIL-101(Al)–NH₂, which is loaded with hypericin, aimed at addressing viral and bacterial challenges. Hypericin, recognised for its antiviral and antibacterial efficacy, was encapsulated to mitigate its hydrophobicity, improve bioavailability, and utilise its photodynamic characteristics. The MIL-101(Al)–NH₂ Hyp complex was synthesised, characterised, and evaluated for its biological applications for the first time. The main objective of this study was to demonstrate the multimodal potential of such a construct, in particular the effect on SARS-CoV-2 protein levels and its interaction with cells. Both <em>in vitro</em> and <em>in vivo</em> experiments demonstrated the effective transport of hypericin to cells that express ACE2 receptors, thereby mimicking mechanisms of viral entry. In addition, hypericin found in the mitochondria showed selective phototoxicity when activated by light, leading to a decrease in the metabolic activity of glioblastoma cells. Importantly, the complex also showed antibacterial efficacy by selectively targeting Gram-positive <em>Staphylococcus epidermidis</em> compared to Gram-negative <em>Escherichia coli</em> under photodynamic therapy (PDT) conditions. To our knowledge, this study was the first to demonstrate the interaction between hypericin, MIL-101(Al)–NH₂ and the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein, which inhibits cellular uptake and colocalises with ACE2-expressing cells. Therefore, the dual functionality of the complex – targeting the viral RBD and the antibacterial effect via PDT – emphasises its potential to mitigate complications of viral infections, such as secondary bacterial infections. In summary, these results suggest that MIL-101(Al)–NH₂ Hyp is a promising multifunctional therapeutic agent for antiviral and antibacterial applications, potentially contributing to the improvement of COVID-19 treatment protocols and the treatment of co-infections.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137454"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Engineering a dual Z-scheme copper oxide/boron carbon nitride/MXene heterojunction with tailored band alignment for high-efficiency photocatalytic degradation of refractory organic pollutants","authors":"Sadaf Mutahir ,&nbsp;Muhammad Asim Khan ,&nbsp;Wenhao Liu ,&nbsp;Rimsha Butt ,&nbsp;Muhammad Humayun ,&nbsp;Lingzong Meng ,&nbsp;Imrana Shaheen","doi":"10.1016/j.jcis.2025.137442","DOIUrl":"10.1016/j.jcis.2025.137442","url":null,"abstract":"<div><div>The accumulation of persistent environmental pollutants presents significant risks to ecosystems and human health, requiring immediate removal and effective control as a pressing global concern. Herein, we report the design and fabrication of graphitic carbon nitride (g-C₃N₄) based dual Z-Scheme heterojunction for effective photocatalytic degradation of various refractory pollutants in wastewater. Firstly, we synthesized boron-doped g-C₃N₄ via the direct calcination of melamine along with boric acid, and then coupled with Copper Oxide (CuO) and MXene via the wet-chemical method to fabricate dual Z-scheme CuO/BCN/MXene composite. The physicochemical features of the as-prepared CuO/BCN/MXene composite and reference samples were investigated via various characterization techniques. The photocatalytic degradation performance and the kinetics study for malachite green was evaluated using the as-fabricated dual Z-scheme composite and the coupling components. The CuO/BCN/MXene composite revealed exceptional photocatalytic performance by achieving 98.3 % degradation for malachite green, which is remarkably higher than the reference samples. The enhanced performance was attributed to the band gap narrowing, extended light absorption, and improved charge carrier separation. This study will provide new insights into the design and fabrication of functional nanomaterials for efficient photocatalytic degradation of pollutants and other applications.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137442"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pt/MXene-enabled industrial flue gas waste heat-driven, dual-product selective photothermal catalytic reduction of CO2 with high efficiency","authors":"Yang Meng ,&nbsp;Wen Li ,&nbsp;Heqing Zhang ,&nbsp;Jinqi Yu ,&nbsp;Zhuoyuan Xiao ,&nbsp;Mario Berrettoni ,&nbsp;Jun Li ,&nbsp;Yongpeng Ma ,&nbsp;Hongzhong Zhang","doi":"10.1016/j.jcis.2025.137405","DOIUrl":"10.1016/j.jcis.2025.137405","url":null,"abstract":"<div><div>This study employs a photodeposition method to load Ag and Pt nanoparticles onto the surface and interlayered structure of MXene, developing an efficient catalyst for CO₂ reduction in industrial flue gas. The catalyst exhibits excellent thermal catalytic performance within a low-temperature range of 60–100 °C, achieving CH₄ and CO production rates of 461 μmol g⁻¹ h⁻¹ and 86 μmol g⁻¹ h⁻¹, respectively, with a CH₄ selectivity of 84.3 %. This temperature range requires no additional heating, relying solely on residual heat from flue gas, which offers a distinct temperature advantage and high catalytic efficiency compared to most thermal and photothermal CO₂ reduction processes. Under simulated sunlight and at 100 °C, the production rates for CH₄ and CO are 34 μmol g⁻¹ h⁻¹ and 589 μmol g⁻¹ h⁻¹, respectively, with a CO selectivity of 94.5 %. Notably, the catalyst demonstrates dual-product selectivity under varying experimental conditions. Experimental characterization and density functional theory (DFT) calculations reveal the thermodynamic and kinetic mechanisms underlying the enhanced production rates and selectivity shifts in both thermal and photothermal catalysis, detailing the CO₂ reduction pathways and Gibbs free energy changes across conditions. This study not only provides a new approach for low temperature CO₂ catalytic reduction but also offers valuable insights into dual-product selectivity, demonstrating great potential for practical applications in industrial flue gas management.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137405"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of 3D porous MXene-based multiple heterojunction catalyst for efficient water oxidation reaction at high current density","authors":"Desheng Guo ,&nbsp;Xu Guo ,&nbsp;Xin Li","doi":"10.1016/j.jcis.2025.137441","DOIUrl":"10.1016/j.jcis.2025.137441","url":null,"abstract":"<div><div>The rational construction of efficient and stable noble-metal-free oxygen evolution reaction (OER) electrocatalysts that work under a industrial-level current density in alkaline environments are urgently needed and challenging. Here we propose a Ti₃C₂T_x MXene-based synthetic method for constructing Co₂P/Ti₃C₂T_x, Fe₂P/Ti₃C₂T_x and Co₂P/Fe₂P multiple heterojunctions (labeled as CoFe-P@MXene) by using strong electrostatic adsorption-electrodeposition-low temperature phosphorization. The obtained CoFe-P@MXene possesses abundant three-dimensional porous structures and inherits the high conductivity of MXene. Experiment results and density functional theory calculations indicate that the formation of multi-heterojunctions between transition metal phosphides and Ti₃C₂T_x MXene can modulate the electronic structure of active sites Co and Fe, alter the d-band center, and thereby optimize the adsorption energy of oxygen-containing intermediates on the active sites. Additionally, the excellent nanoporous structure constructed promotes the penetration of the electrolyte and the release of the product. Thus, The CoFe-P@MXene-based electrocatalyst exhibits excellent OER catalytic performance at both low current densities and industrial-scale current densities, with remarkable low overpotentials of 215 mV at 20 mA cm⁻² and 328 mV at 1000 mA cm⁻² in 1 M KOH solution, respectively. Furthermore, it exhibits good stability, capable of operating stably for 100 h at a current density of 100 mA cm⁻². This work highlights the promising application of MXene-based electrocatalyst with multiple heterojunctional structure for industrial-scale water splitting.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137441"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constructing zinc defects in zinc oxide and interface-anchoring of tricobalt tetraoxide: Modulating d-band center for efficient peroxymonosulfate activation","authors":"Hengyi Xie ,&nbsp;Jianyang Gao ,&nbsp;Haifeng Lin ,&nbsp;Jun Xing ,&nbsp;Fangxu Dai ,&nbsp;Lei Wang ,&nbsp;Jixiang Xu","doi":"10.1016/j.jcis.2025.137451","DOIUrl":"10.1016/j.jcis.2025.137451","url":null,"abstract":"<div><div>Heterojunction catalysts with defects are effective for electron transfer and peroxymonosulfate (PMS) activation. In this study, a Zn vacancy-rich ZnO/Co₃O₄ (Zn_1−xO/Co₃O₄) catalyst featuring Zn-O-Co interfacial bonds was synthesized with Zn_1−xO as a matrix. Its ability to activate PMS for the degradation of ciprofloxacin (CIP) was investigated. The Zn_1−xO/Co₃O₄ achieved nearly complete CIP degradation within 20  min under 17 W sterilamp irradiation. The normalization kinetic constant was 21.7 min⁻¹ M⁻¹, which is 7.2 times higher than that of ZnO. Experimental results and theoretical calculations demonstrated that the Zn vacancy and Co species synergistically enhanced PMS adsorption. The incorporation of Co facilitated the desorption of adsorbed species from the Zn site by lowering the <em>d</em>-band center and promoted electron transfer to PMS. Sterilamp irradiation facilitated the generation of active radicals. The catalyst exhibited high CIP degradation ratios in the continuous-flow experiment, with over 90 % of CIP degraded within 180 min. This study presents a novel approach to enhance the catalytic activity of ZnO for pollutants degradation.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137451"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metal-organic framework Cr-MIL-101-assisted synthesis of highly dispersed chromium oxide incorporated silica for efficient n-hexane dehydrogenation to n-hexenes","authors":"Xiuyi Li,&nbsp;Rui Yan,&nbsp;Chunyi Li","doi":"10.1016/j.jcis.2025.137447","DOIUrl":"10.1016/j.jcis.2025.137447","url":null,"abstract":"<div><div>Mesoporous CrO_x-SiO₂ with highly dispersed chromium sites was synthesized by encapsulating silica into the metal–organic framework Cr-MIL-101 for the dehydrogenation of <em>n</em>-hexane. The optimal SiO₂ content is 27.1 wt% for CrO_x-SiO₂ catalyst, where the octahedral structure of Cr-MIL-101 is preserved, Cr atoms are uniformly distributed, a large specific surface area (395 m²/g) is obtained, and abundant surface oxygen vacancies are observed. 89.7 wt% selectivity to <em>n</em>-hexenes and 28.9 wt% <em>n</em>-hexane conversion are achieved on the CrO_x-27.1wt%SiO₂ catalyst in the absence of H₂. The characterization and in-situ experimental results reveal that the proper distance between the active chromium sites (16.7 Cr/nm² based on the highly dispersed Cr atoms) on the CrO_x-27.1wt%SiO₂ catalyst is responsible for the high <em>n</em>-hexenes selectivity. This critical distance depends on the (i) molecular size and (ii) adsorption geometry of <em>n</em>-hexane, (iii) structural properties of the catalyst. The specially designed redox reaction and density functional theory calculation (DFT) at active oxidative chromium sites show that chromium sites accompanied by oxygen vacancies exhibit high dehydrogenation activity for <em>n</em>-hexane conversion. This work gives a novel idea to synthesis high-performance dehydrogenation catalyst for <em>n</em>-hexane and long-chain alkanes.</div></div>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":"691 ","pages":"Article 137447"},"PeriodicalIF":9.4,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}