Topics in Catalysis最新文献_第10页

Synthesis of TiO2/Co3O4 Composites and their Enhanced Performance in the Electrocatalytic Hydrogen Evolution Reaction TiO2/Co3O4复合材料的合成及其电催化析氢性能的增强

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-28 DOI: 10.1007/s11244-025-02227-4

Changshun Zheng, Fen Qiao

{"title":"Synthesis of TiO2/Co3O4 Composites and their Enhanced Performance in the Electrocatalytic Hydrogen Evolution Reaction","authors":"Changshun Zheng, Fen Qiao","doi":"10.1007/s11244-025-02227-4","DOIUrl":"10.1007/s11244-025-02227-4","url":null,"abstract":"<div><p>Aimed to enhance the electrocatalytic efficiency of the Electrocatalytic hydrogen evolution reaction (HER) by synthesizing TiO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> composites as highly efficient HER electrocatalysts through a two-step hydrothermal reaction method. Addressing the limitations of conventional TiO<sub>2</sub> materials, such as poor electrical conductivity and limited adsorption/desorption ability of hydrogen intermediates, our strategy used the superior electrical conductivity and catalytic activity of Co<sub>3</sub>O<sub>4</sub>. Furthermore, this method significantly increased the surface roughness of TiO<sub>2</sub> microspheres, thereby exposing a greater number of electrocatalytic active sites. The resulting TiO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub>/CC composites exhibited remarkable performance in the HER process, achieving a current density of 10 mA·cm⁻² at a low overpotential of only 150 mV. This outcome indicates fast reaction kinetics and significantly enhanced electrocatalytic activity. Notably, the composite demonstrated robust stability during long-term electrolysis experiments, maintaining stable operation at a current density of 10 mA·cm⁻² for 20 h. These findings provide valuable insights for the design of cost-effective catalysts and the optimization of HER performance.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 1-3","pages":"2 - 12"},"PeriodicalIF":3.0,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145983240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser-Engineered SnO₂ Nanoshells in Chickpea Phytomatrix: A Green Strategy for Efficient Photocatalytic Dye Degradation 激光工程鹰嘴豆植物基质中sno2纳米壳：一种高效光催化降解染料的绿色策略

IF 3.7 3区化学

Topics in Catalysis Pub Date : 2025-10-28 DOI: 10.1007/s11244-025-02221-w

Ahmed Qasim Ubaid, Ali Aqeel Salim, Farzaneh Bayat, Kazem Jamshidi-Ghaleha, Ali Reza Amani-Ghadim

{"title":"Laser-Engineered SnO₂ Nanoshells in Chickpea Phytomatrix: A Green Strategy for Efficient Photocatalytic Dye Degradation","authors":"Ahmed Qasim Ubaid, Ali Aqeel Salim, Farzaneh Bayat, Kazem Jamshidi-Ghaleha, Ali Reza Amani-Ghadim","doi":"10.1007/s11244-025-02221-w","DOIUrl":"10.1007/s11244-025-02221-w","url":null,"abstract":"<div><p>This work presents a sustainable and surfactant-free strategy for synthesizing photocatalytically active tin oxide nanoshells (SnO<sub>2</sub>NSs) via pulsed laser ablation in liquid (PLAL) using chickpea extract as a phytochemical-rich medium. A Q-switched Nd: YAG laser (λ = 1064 nm) operating at fluences of 7.53–37.67 J/cm<sup>2</sup> generated well-defined crystalline core–shell nanostructures with an average diameter of 13.6 ± 6.3 nm, as confirmed by Bio-TEM, SAED, and FTIR analyses. Optical characterization revealed intense UV absorption at ~ 250 nm, dual fluorescence bands at ~ 360 and ~ 443 nm, and tunable fluorescence quantum yields (0.13–0.24). SnO<sub>2</sub>NSs synthesized at an optimal fluence of 22.6 J/cm<sup>2</sup> achieved 96.6% degradation of methylene blue dye (MBD) within 150 min under UV irradiation. The superior photocatalytic activity was attributed to nanoshell morphology, surface hydroxylation, and biomolecular capping, which synergistically enhanced charge separation and reactive oxygen species generation. These findings demonstrate the synergy between laser-induced nanostructuring and biofunctional stabilization, establishing SnO<sub>2</sub>NSs an innovative platform for next-generation nanophotocatalysts and advanced wastewater treatment applications.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 15-16","pages":"2148 - 2160"},"PeriodicalIF":3.7,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanocomposite Materials Based on Zinc Oxide, Silver, and Tin Nanoparticles as Electrocatalysts Towards the Azo Dyes 氧化锌、银、锡纳米复合材料作为偶氮染料电催化剂的研究

IF 3.7 3区化学

Topics in Catalysis Pub Date : 2025-10-28 DOI: 10.1007/s11244-025-02225-6

F. Y. Alzoubi, H. M. Al-Khateeb, M. K. Alqadi, A. B. Migdadi

{"title":"Nanocomposite Materials Based on Zinc Oxide, Silver, and Tin Nanoparticles as Electrocatalysts Towards the Azo Dyes","authors":"F. Y. Alzoubi, H. M. Al-Khateeb, M. K. Alqadi, A. B. Migdadi","doi":"10.1007/s11244-025-02225-6","DOIUrl":"10.1007/s11244-025-02225-6","url":null,"abstract":"<div><p>In this work, nanocomposite materials based on zinc oxide, silver, and tin (ZnO-(Sn/Ag)) were manufactured, characterized, and utilized as electrocatalysts for the Acid Orange 7 (AO7) dye. Introducing Ag and Sn ions into ZnO reduces the crystal size (<span>(:D)</span>), the average grain size, and the bandgap energy <span>(:left({E}_{text{g}}right))</span>. Moreover, it was observed that incorporating Ag and Sn into ZnO leads to improvement in the absorbance and average electrical conductivity. For instance, the <span>(:sigma:)</span> value of pure ZnO is <span>(:1.4times:{10}^{-2})</span> <span>(:text{S}.text{c}{text{m}}^{-1})</span> while for ZnO-(Ag/Sn) is <span>(:1.3times:{10}^{-1})</span> <span>(:text{S}.text{c}{text{m}}^{-1})</span>. On the other hand, the AO7 spectra were analyzed under various electrochemical reaction times using ZnO-(Ag/Sn) NCs. The degradation efficiency of ZnO and ZnO-(Ag/Sn) NCs was found to be 84% and 99%, with first-order kinetic constants (<i>k</i><sub><i>1</i></sub>) of 0.086 min<sup><i>−</i>1</sup> and 0.04 min<sup><i>−</i>1</sup>, respectively. As noticed, the degradation of AO7 under electrochemical reaction using ZnO-(Ag/Sn) NCs is faster than the ZnO sample, and the kinetics of degradation under the reaction agreed with the first-order reaction. The ZnO-(Sn/Ag) NCs are attractive for photo-electrocatalyst applications and could also be employed in antibacterial applications.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 15-16","pages":"2043 - 2052"},"PeriodicalIF":3.7,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Testing of X-Fe2O4/Al2O3 (X = NiZn, NiMg, MgZn) Composite Catalysts for Microwave-Driven Conversion of HDPE Plastic into Carbon Nanotubes and Hydrogen X- fe2o4 /Al2O3 （X = NiZn, NiMg, MgZn）复合催化剂对HDPE塑料微波转化成碳纳米管和氢的测试

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-28 DOI: 10.1007/s11244-025-02210-z

Bilal Shoukat, Hammad Hussain, Muhammad Yasin Naz, Yasin Khan, Yaning Zhang

{"title":"Testing of X-Fe2O4/Al2O3 (X = NiZn, NiMg, MgZn) Composite Catalysts for Microwave-Driven Conversion of HDPE Plastic into Carbon Nanotubes and Hydrogen","authors":"Bilal Shoukat, Hammad Hussain, Muhammad Yasin Naz, Yasin Khan, Yaning Zhang","doi":"10.1007/s11244-025-02210-z","DOIUrl":"10.1007/s11244-025-02210-z","url":null,"abstract":"<div><p>This study examined a series of X–Fe₂O₄/Al₂O₃ (X = NiZn, NiMg, MgZn) composite catalysts for microwave-assisted catalytic breakdown of high-density polyethylene (HDPE) waste into hydrogen fuel and carbon nanotubes (CNTs). A single-stage catalytic pyrolysis was conducted at 450 °C using Al₂O₃–NiZnFe₂O₄, Al₂O₃–NiMgFe₂O₄, and Al₂O₃–MgZnFe₂O₄) composite catalysts. The catalysts were characterized before pyrolysis using XRD, UV-Vis spectroscopy, FTIR, and SEM, and their physicochemical properties were correlated with their catalytic performance. Among the tested systems, Al₂O₃–NiZnFe₂O₄ showed the highest efficiency, producing 47.03 mmol/g<sub>plastic</sub> of hydrogen and 287 mg/g<sub>plastic</sub> of CNTs. This enhanced activity was attributed to its smaller particle size, greater dispersion, and more effective microwave absorption, which facilitated the creation of localized hot spots and promoted the cracking of polymer chains. The presence of Al₂O₃ in the composites further supported hydrogen release and CNT growth by converting intermediate hydrocarbons formed during thermal cracking. A proposed reaction mechanism includes polymer chain scission, catalytic dehydrogenation, and carbon deposition on ferrite nanoparticles. These results demonstrate the potential of microwave-responsive ferrite–Al₂O₃ catalysts for the eco-friendly recycling of plastics into clean hydrogen and valuable carbon nanomaterials.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 4-7","pages":"1055 - 1073"},"PeriodicalIF":3.0,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147342931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green Synthesis of Mn2V2O7 Nanoparticles and Its Dual Functionality in Electrochemical Urea Sensing and Photocatalytic Dye Degradation 纳米Mn2V2O7的绿色合成及其在电化学尿素传感和光催化染料降解中的双重功能

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-18 DOI: 10.1007/s11244-025-02213-w

H. Anantharama, J. R. Naveen Kumar, M. Rohit, Divya R. Basavannavar, B. M. Praveen, Asad Syed, R. Harini, G. Nagaraju, Bharath K. Devendra

{"title":"Green Synthesis of Mn2V2O7 Nanoparticles and Its Dual Functionality in Electrochemical Urea Sensing and Photocatalytic Dye Degradation","authors":"H. Anantharama, J. R. Naveen Kumar, M. Rohit, Divya R. Basavannavar, B. M. Praveen, Asad Syed, R. Harini, G. Nagaraju, Bharath K. Devendra","doi":"10.1007/s11244-025-02213-w","DOIUrl":"10.1007/s11244-025-02213-w","url":null,"abstract":"<div><p>The solution combustion approach was used to create manganese vanadate (Mn<sub>2</sub>V<sub>2</sub>O<sub>7</sub>) nanoparticles (NPs) at 500 °C using manganese nitrate (Mn(NO<sub>3</sub>)<sub>2</sub>), ammonium metavanadate (NH<sub>4</sub>VO<sub>3</sub>) and chia seeds as fuel. Using a variety of methods, such as photoluminescence (PL), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), and X-ray diffraction (XRD), a thorough examination of the synthesized NPs was carried out to look into their surface morphology, optical characteristics, and crystal structure. These nanoparticles were also utilized in the photocatalytic reduction of rose bengal dye. The produced Mn<sub>2</sub>V<sub>2</sub>O<sub>7</sub> NPs, with a crystal size of 26.03 nm, were found to have a monoclinic crystalline structure, according to XRD examination. To ascertain the form of the NPs, scanning electron microscopy was employed. Additionally, the produced NPs were used to detect urea via dropcasting and electrode modification methods. Before beginning any experiment, the electrodes were air-dried overnight. This work demonstrates the Mn<sub>2</sub>V<sub>2</sub>O<sub>7</sub> NPs’ multifunctionality, which makes them attractive options for a range of uses, such as photocatalysis and sensing.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 8-11","pages":"1152 - 1163"},"PeriodicalIF":3.0,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surfactant-Guided Synthesis of Mn₃O₄ Nanostructures for Photocatalytic, Photoelectrochemical Applications and Sustainable Water Reuse 表面活性剂引导下Mn₃O₄纳米结构的合成及其光催化、光电化学应用和水的可持续回用

IF 3.7 3区化学

Topics in Catalysis Pub Date : 2025-10-18 DOI: 10.1007/s11244-025-02222-9

Anagha Joby, Manoj Balachandran, V. Deepthi

{"title":"Surfactant-Guided Synthesis of Mn₃O₄ Nanostructures for Photocatalytic, Photoelectrochemical Applications and Sustainable Water Reuse","authors":"Anagha Joby, Manoj Balachandran, V. Deepthi","doi":"10.1007/s11244-025-02222-9","DOIUrl":"10.1007/s11244-025-02222-9","url":null,"abstract":"<div><p>Currently, the global community is confronting water contamination from several sources, which poses significant environmental challenges. The reutilisation of polluted water constitutes a feasible strategy for sustainable wastewater management. In the present study, Mn<sub>3</sub>O<sub>4</sub> was synthesised via chemical precipitation using polyvinyl alcohol (PVA), cetyltrimethylammonium bromide (CTAB) and glycine as surfactants and without any surfactants. The synthesised Mn<sub>3</sub>O<sub>4</sub> using Glycine(MNG) showed the best photocatalytic efficacy compared to other synthesised materials, about 93 ± 0.35% disintegration of Rhodamine B in 150 min when illuminated with visible light. The progress of photodegradation was in conformity with the pseudo-first-order kinetic model with a velocity of 0.017 min<sup>−1</sup>. Photoelectrochemical investigations assessed charge transfer, stability, and light-harvesting behaviour of Mn<sub>3</sub>O<sub>4</sub> catalysts, showing their improved performance beyond photocatalysis. Seed germination in the treated water, controlled and uncontrolled conditions, was compared to ensure the agricultural and environmental viability. Additionally, ~ 84.54% of total organic carbon removal was achieved. A conceivable degradation mechanism was suggested after the degraded intermediates were examined using high-performance liquid chromatography (HPLC) and the elution patterns and retention periods.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 15-16","pages":"2117 - 2136"},"PeriodicalIF":3.7,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding the Mechanisms of Dyes and Heavy Metals via NiO Nanoparticles: Kinetic and Isothermal Perspectives 通过NiO纳米颗粒解码染料和重金属的机制：动力学和等温视角

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-14 DOI: 10.1007/s11244-025-02215-8

M. Mahadeva Swamy, B. Roopashree, Bincy Rose Vergis, A. S. Sowmyashree, D. Kathyayani

{"title":"Decoding the Mechanisms of Dyes and Heavy Metals via NiO Nanoparticles: Kinetic and Isothermal Perspectives","authors":"M. Mahadeva Swamy, B. Roopashree, Bincy Rose Vergis, A. S. Sowmyashree, D. Kathyayani","doi":"10.1007/s11244-025-02215-8","DOIUrl":"10.1007/s11244-025-02215-8","url":null,"abstract":"<div><p>In this study, Amaranth dye (AD) and chromium (VI) were extracted from aqueous solutions using a batch adsorption technique employing nickel oxide nanoparticles (NiO NPs) as adsorbents. The physical properties of the prepared NPs were characterized using Energy-dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction studies (XRD), UV-visible spectroscopy, Bandgap studies, and point of zero charge (pH pZC). Various parameters, including adsorbent concentrations (0.01–0.06 g), pH (2–12), dye concentration (10–100 mg/L), contact time (10–140 min), and temperature (303 K), were investigated to assess their impact on adsorption efficiency. The kinetic data followed by the pseudo-second-order model, and the Langmuir isotherm best described the adsorption behaviour at equilibrium, also including thermodynamic analysis. Adsorption capacity (qm) increased with contact time, and while pH had an inverse effect on Chromium(VI) adsorption, it enhanced Amaranth dye removal. The results demonstrate the potential of green-synthesized NiO NPs for effective dye and heavy metal removal.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 8-11","pages":"1361 - 1374"},"PeriodicalIF":3.0,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Metal-Support Interaction on Anisole Hydrodeoxygenation Activity on Noble Metal TiO2-Based Catalysts 金属-载体相互作用对贵金属tio2基催化剂苯甲醚加氢脱氧活性的影响

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-14 DOI: 10.1007/s11244-025-02207-8

Albert Miró i Rovira, Jørgen Skjæveland, Kishore Rajendran, Tina Bergh, Petter Tingelstad, Rune Myrstad, De Chen

{"title":"Influence of Metal-Support Interaction on Anisole Hydrodeoxygenation Activity on Noble Metal TiO2-Based Catalysts","authors":"Albert Miró i Rovira, Jørgen Skjæveland, Kishore Rajendran, Tina Bergh, Petter Tingelstad, Rune Myrstad, De Chen","doi":"10.1007/s11244-025-02207-8","DOIUrl":"10.1007/s11244-025-02207-8","url":null,"abstract":"<div><p>Hydrodeoxygenation (HDO) is a critical process for upgrading biomass-derived feedstocks. It enables the removal of oxygen, which improves stability, energy density, and compatibility with existing fuel infrastructure. This study examines the catalytic performance of titania-supported noble metals (ruthenium [Ru], rhodium [Rh], palladium [Pd], silver [Ag], iridium [Ir], platinum [Pt], and gold [Au]) in the HDO of anisole, a model compound for lignin-derived oxygenates. The catalysts were prepared via incipient wetness impregnation and characterized using X-ray fluorescence (XRF), nitrogen physisorption (N<sub>2</sub>-physisorption), X-ray diffraction (XRD), carbon monoxide (CO) chemisorption, thermogravimetric reduction (TPR), ammonia-temperature-programmed desorption (NH<sub>3</sub>-TPD), hydrogen-temperature-programmed desorption (H<sub>2</sub>-TPD), and transmission electron microscopy (TEM). The results reveal that metal-support interactions significantly influence metal dispersion, activity, and selectivity. Rh and Pt catalysts exhibited the highest anisole conversion and benzene selectivity due to their small particle sizes, high dispersion, and strong hydrogen spillover effects. Conversely, Ag and Au catalysts demonstrated limited activity: Ag induced a phase transition in TiO<sub>2</sub>, and Au formed large particles. Residual chlorine from precursor salts notably affected the performance of Ru/TiO<sub>2</sub> and Ir/TiO<sub>2</sub>. Reducible TiO<sub>2</sub> support was found to enhance demethoxylation activity synergistically compared to SiO<sub>2</sub>, highlighting the importance of support reducibility for HDO. This work provides insights into the structure-function relationships of noble metal/TiO<sub>2</sub> catalysts.</p></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"68 20","pages":"2549 - 2564"},"PeriodicalIF":3.0,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11244-025-02207-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145675653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multifunctional MOF-5@ZnCo2O4 Composite for Photocatalytic Dye Degradation of Crystal Violet Dye and Electrocatalytic Applications: Hydrogen Evolution Reaction and Supercapacitor Studies 多功能MOF-5@ZnCo2O4光催化染料降解结晶紫染料复合材料及其电催化应用：析氢反应和超级电容器研究

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-14 DOI: 10.1007/s11244-025-02198-6

Savitha Hosamane, Nagaraju Kottam, Aishwarya Chalil Suresh, Mallappa Mahanthappa, Mohd Afzal

{"title":"Multifunctional MOF-5@ZnCo2O4 Composite for Photocatalytic Dye Degradation of Crystal Violet Dye and Electrocatalytic Applications: Hydrogen Evolution Reaction and Supercapacitor Studies","authors":"Savitha Hosamane, Nagaraju Kottam, Aishwarya Chalil Suresh, Mallappa Mahanthappa, Mohd Afzal","doi":"10.1007/s11244-025-02198-6","DOIUrl":"10.1007/s11244-025-02198-6","url":null,"abstract":"<div><p>The metal-organic framework with ZnCo<sub>2</sub>O<sub>4</sub> combined (MOF-5@ZnCo<sub>2</sub>O<sub>4</sub>) composite is presented in this study as a flexible and state-of-the-art basis for sophisticated waste water treatment, hydrogen evolution reaction (HER) and supercapacitor devices. The impact of ZnCo<sub>2</sub>O<sub>4</sub> doping on MOF-5 structure, which enhances stability and photo/electrochemical performance, is highlighted in this work. MOF-5@ZnCo<sub>2</sub>O<sub>4</sub> is prepared by a simple solution combustion and solvothermal synthesis method and well characterised by various spectroscopic techniques. The MOF-5@ZnCo<sub>2</sub>O<sub>4</sub> composite exhibits pseudo first order reaction kinetics and 98% degradation capacity observed for crystal violet dye. The composite MOF-5@ZnCo<sub>2</sub>O<sub>4</sub> demonstrated a Tafel slope of 125 mV/dec in an acidic solution and a minimal overpotential of 358 mV for HER applications. Additionally, at 10 mA/cm<sup>2</sup>, it remains constant for 12 h. Furthermore, we conducted research on MOF-5@ZnCo<sub>2</sub>O<sub>4</sub> composite for supercapacitors. Its specific capacitance is 33 F/g at a current density of 2 A/g. Our results put this composite at the forefront by showing enhanced performance and adaptability in addressing the challenges of energy and constantly shifting environment.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 8-11","pages":"1114 - 1130"},"PeriodicalIF":3.0,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147579173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Photocatalytic Degradation of Ciprofloxacin from Pharmaceutical Wastewater Using Microwave-Synthesized Lanthanum/MXene Nanocomposites 微波合成镧/MXene纳米复合材料光催化降解制药废水中的环丙沙星

IF 3 3区化学

Topics in Catalysis Pub Date : 2025-10-10 DOI: 10.1007/s11244-025-02214-9

Upasana Bagri, Saima Jan, Ajit Sharma, Prabal Pratap Singh

{"title":"Enhanced Photocatalytic Degradation of Ciprofloxacin from Pharmaceutical Wastewater Using Microwave-Synthesized Lanthanum/MXene Nanocomposites","authors":"Upasana Bagri, Saima Jan, Ajit Sharma, Prabal Pratap Singh","doi":"10.1007/s11244-025-02214-9","DOIUrl":"10.1007/s11244-025-02214-9","url":null,"abstract":"<div><p>The rampant misuse of pharmaceuticals, including ciprofloxacin, has severely harmed ecosystems. Although oxidative degradation of ciprofloxacin shows promise, it often requires substantial energy consumption. Therefore, developing an eco-friendly and efficient degradation method is crucial. This study investigates the degradation of ciprofloxacin using MXene (Ti<sub>3</sub>C<sub>2</sub>) synthesized via conventional and microwave-assisted (MW) methods. To enhance photocatalytic activity, La/MXene nanocomposites were synthesized using the MW method with three different ratios (1:1, 1:2, and 2:1). Characterization techniques, including FTIR, XRD, SEM, and EDX analysis, confirmed the development of MXene and La/MXene nanocomposites. SEM images revealed lanthanum nanoparticles attached to the surface of MXene layers. The effects of pH, time, and hydrogen peroxide concentration on ciprofloxacin removal were examined. Photocatalytic investigations showed that La/MXene nanocomposites significantly outperformed pure MXene in ciprofloxacin removal. Notably, the La/MXene nanocomposite (1:2) achieved a remarkable removal efficiency of 97.83% within 120 min. Adding 0.05% H<sub>2</sub>O<sub>2</sub> further enhanced degradation to 99.05%. The La/MXene nanocomposite demonstrated good recyclability and stability.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":801,"journal":{"name":"Topics in Catalysis","volume":"69 4-7","pages":"1007 - 1028"},"PeriodicalIF":3.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0