Catalysis Letters最新文献_第10页

Nd/MnO2 Bio-nanomaterial: Synergistic Enhancement of Antimicrobial Activity and Photocatalytic Dye Degradation Nd/MnO2生物纳米材料：协同增强抗菌活性和光催化降解染料

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-27 DOI: 10.1007/s10562-025-05171-w

Divya T, Prashanna Suvaitha S, Niveditha S, Venkatachalam K

Dye-polluted wastewater and antibiotic-resistant bacteria present urgent environmental and health challenges. Multifunctional nanomaterials with both photocatalytic and antibacterial properties offer a sustainable solution. This study biosynthesized neodymium-doped manganese dioxide (Nd/MnO₂) nanoparticles via a green method and evaluated their structural, optical, photocatalytic, and antibacterial performance. Nd/MnO₂ was synthesized using Adenanthera pavonina L. leaf extract as a capping and stabilizing agent. Characterization included XRD (tetragonal α-MnO₂, crystallite size reduced from 13.9 To 12.5 nm after Nd doping), FT-IR (O–Mn–O stretching at 464 cm^-1 with reduced intensity), TGA (stability up To 1000 °C), DRS UV–Vis (red shift 323→327 nm; band gap 2.6→2.3 eV), FESEM/TEM (hierarchical nanoflowers, ~ 28.5 nm size), EDX/mapping (uniform Nd, Mn, O distribution, Nd 2.2 wt%), and XPS. Under visible light, Nd/MnO₂ degraded Congo red (84.52%), Brilliant green (88.18%), and Nile blue A (82.98%) within 120 min, following pseudo-first-order kinetics. Antibacterial testing revealed strong inhibition zones, with the highest (23 mm) against Staphylococcus aureus. Green-synthesized Nd/MnO₂ nanoparticles show high crystallinity, thermal stability, enhanced visible-light absorption, and synergistic photocatalytic–antibacterial activity, making them promising for textile dye wastewater remediation and antimicrobial applications.

Graphical Abstract

Nd/MnO₂ Nanoparticles Exhibiting Dual Functionalities: Photocatalytic Degradation and Antibacterial Activity

染料污染废水和耐药细菌对环境和健康构成了紧迫的挑战。具有光催化和抗菌特性的多功能纳米材料提供了一种可持续的解决方案。本研究通过绿色方法合成了掺钕二氧化锰（Nd/MnO2）纳米颗粒，并对其结构、光学、光催化和抗菌性能进行了评价。以水芋叶提取物为封盖稳定剂，合成了Nd/MnO2。表征方法包括XRD（四方α-MnO2， Nd掺杂后晶粒尺寸从13.9 nm降至12.5 nm）、FT-IR （O -Mn - O在464 cm-1处拉伸强度降低）、TGA（稳定性高达1000℃）、DRS UV-Vis（红移323→327 nm；带隙2.6→2.3 eV）、FESEM/TEM（分级纳米花，~ 28.5 nm）、EDX/mapping （Nd、Mn、O均匀分布，Nd 2.2 wt%）和XPS。在可见光下，Nd/MnO2在120 min内降解刚果红（84.52%）、鲜绿（88.18%）和尼罗蓝A(82.98%)，符合准一级动力学。抗菌试验显示对金黄色葡萄球菌有较强的抑菌带，抑菌带最高（23 mm）。绿色合成的Nd/MnO2纳米颗粒具有高结晶度、热稳定性、增强的可见光吸收和协同光催化-抗菌活性，在纺织染料废水的修复和抗菌应用中具有广阔的前景。nd /MnO2纳米颗粒具有双重功能：光催化降解和抗菌活性

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引用次数: 0

Exploring La-Based High Entropy Perovskites for Syngas Production Via Methane Reforming 探索la基高熵钙钛矿用于甲烷重整合成气的研究

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-26 DOI: 10.1007/s10562-025-05189-0

Aathira Bhaskaran, Satyapaul A. Singh, Sounak Roy

Perovskite-type oxides (ABO₃), featuring lanthanum at the A-site and transition metals at the B-site, have attracted considerable attention due to their structural flexibility and redox-active d-orbitals. Recently, High Entropy Perovskite Oxide catalysts have emerged as promising materials, owing to several key attributes: phase stabilization driven by high configurational entropy, enhanced resistance to sintering due to sluggish diffusion, lattice distortion that promotes reactivity, and the “cocktail effect,” which enables synergistic electronic and structural tuning. The selection of transition metals at the B-site plays a critical role in determining catalytic performance. In this study, we investigated two high entropy compositions—LaMg_0.2Fe_0.2Co_0.2Ni_0.2Mn_0.2O₃ and LaMg_0.2Fe_0.2Co_0.2Ni_0.2Cu_0.2O₃—by comparing their catalytic activity, stability, and syngas selectivity, with particular emphasis on the role of exsolved nanoparticles in enhancing methane reforming performance.

Graphical abstract

Schematic illustration of dry reforming of methane over high entropy perovskite oxide catalysts.

钙钛矿型氧化物（ABO3）以a位镧和b位过渡金属为特征，由于其结构柔韧性和氧化还原活性的d轨道而引起了人们的广泛关注。最近，高熵钙钛矿氧化物催化剂已经成为一种很有前途的材料，因为它具有几个关键属性：由高构型熵驱动的相稳定，由于缓慢扩散而增强的烧结阻力，促进反应性的晶格畸变，以及“鸡尾酒效应”，可以实现协同电子和结构调谐。b位过渡金属的选择在决定催化性能方面起着关键作用。在这项研究中，我们研究了两种高熵组分lamg0.2 fe0.2 co0.2 ni0.2 mn0.2o3和lamg0.2 fe0.2 co0.2 ni0.2 cu0.2 2o3，通过比较它们的催化活性、稳定性和合成气选择性，特别强调了溶解纳米颗粒在提高甲烷重整性能方面的作用。图解：甲烷在高熵钙钛矿氧化物催化剂上干重整的示意图。

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引用次数: 0

Metal-Free Iodide-Assisted Reductive Deoxygenation of Alcohols Using Molecular Hydrogen 无金属碘化物辅助醇类分子氢还原脱氧

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-22 DOI: 10.1007/s10562-025-05175-6

Haikuan Yang, Jihong Zhang, Xiang Ye, Fengying Qiu, Haiwei Jiang, Mingfeng Dong, Yang Peng

The deoxygenation of alcohols is an important research area in modern organic chemistry that has been studied extensively. However, a chemoselective and clean method is still desirable for the emerging large scale bio-chemicals production. Herein, we report a method for alcohols deoxygenation to alkanesusing hydrogen as the reductant assisted by iodide without metal catalyst. This method is simple and green without consume quantitative extra reagents. Substrate scope study showed that this method tolerated a broad scope of functional groups including phenyl, naphthyl and allyl alcohol derivatives. Kinetics study revealed that the C-I (formed by hydroxyl group substituted by iodide) cleavage was the rate-determining step. Mechanistic study suggested a radical mechanism for this alcohol deoxygenation reactions.

Graphical Abstract

醇的脱氧反应是现代有机化学中一个重要的研究领域，得到了广泛的研究。然而，一种化学选择性和清洁的方法仍然是新兴的大规模生化生产所需要的。本文报道了一种不用金属催化剂，以氢为还原剂，碘化物辅助，将醇脱氧成烷烃的方法。该方法简便、绿色环保，无需额外消耗定量试剂。底物范围研究表明，该方法可耐受广泛的官能团，包括苯基、萘基和烯丙醇衍生物。动力学研究表明，C-I（由碘取代的羟基形成）裂解是反应速率的决定步骤。机理研究表明，该醇脱氧反应可能存在自由基机制。图形抽象

引用次数: 0

BaWO4:Eu³⁺, Ag⁺ Nanocatalyst for Efficient Reduction of 4-Nitrophenol in Aqueous Solution BaWO4:Eu³+、Ag +纳米催化剂在水溶液中高效还原4-硝基苯酚

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-22 DOI: 10.1007/s10562-025-05183-6

Dasrathi Murmu, Rajkumari Bindiya Devi, Ningombam Yaiphaba, Bibhuti Bhusan Parida, Ganngam Phaomei

BaWO₄ nanoparticles doped and co-doped with various metal ions like Eu³⁺, Ag⁺, Li⁺, Zn²⁺ and Bi³⁺, etc., are synthesized using a simple polyol route. The synthesized NPs were characterized by XRD, TEM, XPS, EDX and a UV-VIS spectrometer. From the TEM image, the NPs are spherical in shape with an average particle size of 15 nm. The band gap of the NPs is calculated using Tauc’s plot, and it is found to change with the concentration of co-dopant ions and the pH of the synthesis medium. The crystal size, crystallinity %, and lattice strain are calculated from the XRD data and it is found that BaWO₄:Eu³⁺, Ag⁺ NPs have a smaller size and larger strain. However, this nanoparticle demonstrated better catalytic activity in reducing the organic pollutant, 4-Nitrophenol (4-NP). The rate constant (k) for the reduction of 4-NP is 6.14 × 10⁻³ s^-1. The catalyst is stable and can be reused for five consecutive cycles.

Graphical Abstract

采用简单的多元醇路线合成了与Eu3+、Ag+、Li+、Zn2+、Bi3+等多种金属离子掺杂或共掺杂的BaWO4纳米颗粒。采用XRD、TEM、XPS、EDX和紫外可见光谱对合成的NPs进行了表征。从TEM图像来看，NPs为球形，平均粒径为15 nm。利用Tauc图计算了NPs的带隙，发现带隙随共掺杂离子的浓度和合成介质的pH值而变化。根据XRD数据计算了BaWO4:Eu3+、Ag+ NPs的晶粒尺寸、结晶度%和晶格应变，发现BaWO4:Eu3+、Ag+ NPs的尺寸较小，应变较大。然而，该纳米颗粒对有机污染物4-硝基苯酚（4-NP）表现出较好的催化活性。4-NP的还原速率常数(k)为6.14 × 10−3 s-1。该催化剂性能稳定，可连续重复使用5次。图形抽象

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引用次数: 0

Cu(II)-Aminotetrazole Complex Anchored on SBA-15: A High-Performance Catalyst for the Synthesis of 1,4-Disubstituted-1,2,3-Triazoles SBA-15上锚定的Cu(II)-氨基四唑配合物：合成1,4-二取代-1,2,3-三唑的高性能催化剂

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-22 DOI: 10.1007/s10562-025-05179-2

Nafiseh Taghavi, Yagoub Mansoori, Somayeh Fekri, Yuksel Akinay, Tayfun Çetin

This research focuses on developing and thoroughly analyzing a copper catalyst anchored to SBA-15. The catalyst was prepared via stepwise functionalization of SBA-15, involving successive treatments with (3-aminopropyl)triethoxysilane (APTES), trichlorotriazine, and 5-aminotetrazole to form SBA@bis(ATET). Coordination with Cu(OAc)₂ in acetonitrile yielded the final complex, SBA@bis(ATET)-Cu(II). Characterization techniques included FT-IR, Brunauer-Emmett-Teller (BET) surface analysis, cross-polarization/magic angle spinning ¹³C NMR (CP/MAS ¹³C NMR), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). Catalytic studies demonstrated that SBA@bis(ATET)-Cu(II) efficiently catalyzed the synthesis of 1,4-disubstituted-1,2,3-triazoles through the reaction of acetylenes, benzyl or alkyl halides, and sodium azide, achieving excellent yields under optimized conditions. The catalyst exhibited excellent recyclability, maintaining activity over five cycles with minimal deactivation and low copper leaching (1.25%) in the first cycle, highlighting its robustness and sustainability for organic synthesis applications.

Graphical Abstract

本研究的重点是开发和深入分析锚定在SBA-15上的铜催化剂。催化剂通过SBA-15的逐步功能化制备，包括（3-氨基丙基）三乙氧基硅烷（APTES）、三氯三嗪和5-氨基四唑的连续处理，形成SBA@bis（ATET）。与Cu(OAc)2在乙腈中配位得到最终的配合物SBA@bis(ATET)-Cu（II）。表征技术包括FT-IR， brunauer - emmet - teller （BET）表面分析，交叉极化/魔角旋转13C NMR (CP/MAS 13C NMR)，热重分析（TGA）和x射线光电子能谱（XPS）。催化研究表明，SBA@bis(ATET)-Cu（II）通过乙炔、苄基卤化物或烷基卤化物和叠氮化钠的反应，有效地催化了1,4-二取代-1,2,3-三唑的合成，并在优化条件下取得了优异的产率。该催化剂表现出优异的可回收性，在5个循环中保持活性，失活最小，第一个循环铜浸出率低（1.25%），突出了其在有机合成应用中的稳健性和可持续性。图形抽象

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引用次数: 0

Ce-Doping Enhanced Catalytic Performance of Cobalt-Based Bimetallic MOFs for Ultrafast Degradation of Rhodamine B via Peroxymonosulfate Activation 铈掺杂增强钴基双金属mof催化过氧单硫酸盐活化超快降解罗丹明B的性能

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-20 DOI: 10.1007/s10562-025-05170-x

Jian Tian, Huizhong Wu, Wanping Chen, Kexin Luo, Xiyue Feng, Wang Ye, Yingxi Wang, Ling Li

In view of the harm of dye wastewater to the ecological environment and human health and the limitations of traditional treatment technologies, this study focused on the advanced persulfate oxidation technology (PS-AOPs), which synthesized cerium-doped cobalt-based bimetallic organic framework materials (Co/Ce-MOFs-NH₂) by solvothermal method for the activation of pyrosulfate (PMS) for the degradation of rhodamine B (RhB). The rare earth element cerium (Ce) was innovatively introduced to construct a bimetallic synergistic system to solve the problems of single active site and poor cycling stability of monometallic Co-MOFs. The effects of catalyst dosage, PMS concentration, initial pollutant concentration and pH value on the degradation efficiency were systematically explored, and the hydroxyl radicals (·OH). This study provides theoretical support for the design of rare earth element enhanced bimetallic MOFs catalysts.

Graphical Abstract

针对染料废水对生态环境和人体健康的危害以及传统处理技术的局限性，本研究重点研究了高级过硫酸盐氧化技术（PS-AOPs），采用溶剂热法合成掺铈钴基双金属有机骨架材料（Co/Ce-MOFs-NH₂），以活化过硫酸盐（PMS）降解罗丹明B （RhB）。创新地引入稀土元素铈（Ce）构建双金属协同体系，解决了单金属Co-MOFs活性位点单一、循环稳定性差的问题。系统探讨了催化剂用量、PMS浓度、污染物初始浓度和pH值对降解效率的影响，以及羟基自由基（·OH）的影响。该研究为稀土元素增强双金属mof催化剂的设计提供了理论支持。图形抽象

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引用次数: 0

Research on the Electrocatalytic Hydrogen Evolution Performance of MoS2/NiSe2/CP Nano Composites MoS2/ nis2 /CP纳米复合材料电催化析氢性能研究

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-20 DOI: 10.1007/s10562-025-05163-w

Xiaoran Guo, Haibo Wang, Qingzhu Sun, Yongchang Zhu, Qirong Li, Tao Tang

Two-dimensional layered molybdenum disulfide (MoS₂) is a catalyst for hydrogen production by hydrogen evolution reaction (HER). However, it exhibits has poor electronic conductivity and a high activation energy barrier for adsorption/dissociation of water molecules in the alkaline HER, which limits its application in alkaline HER. In this paper, MoS₂ was uniformly grown on three-dimensional conductive carbon paper (CP) by the hydrothermal method, presenting a nanoflower shape and effectively improving the conductivity of the electrode. Subsequently, NiSe₂ was grown onto MoS₂ nanoflowers in the form of nanoparticles by the secondary hydrothermal method to form a MoS₂/NiSe₂/CP nanocomposite structure. The structure and morphology of MoS₂/NiSe₂/CP were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results showed that MoS₂ was composed of nanoflower-like structures formed by the combination of thin nanosheets. The average diameter of the nanoflowers is approximately 1.3 ± 0.2 μm. NiSe₂ nanoparticles grew uniformly on the MoS₂ nanoflowers, with an average particle size of 30–100 nm, providing a larger specific surface area that exposes more reactive sites. The MoS₂/NiSe₂ heterointerface is conducive to electron redistribution, and the XPS peak shifts Mo 3d: + 0.4 eV; S 2p: + 0.3 eV. The synergistic architecture provides an electrochemical surface area (ECSA) higher than that of MoS2/CP. The introduction of NiSe₂ effectively inhibits the agglomeration of MoS₂, enhances the dispersion of the catalyst on the substrate, and increases the effective reaction area. The MoS₂/NiSe₂/CP was tested for HER with an overpotential of only 112 mV at a current density of − 10 m cm⁻² ang a Tafel slope of 42.01 mV dec⁻¹. The introduction of NiSe₂ nanoparticles effectively promoted the water adsorption/cracking reaction and thus co-catalyzed HER with MoS₂, demonstrating good stability.

Graphical Abstract

二维层状二硫化钼（MoS2）是析氢反应（HER）产氢催化剂。然而，它在碱性HER中表现出较差的电子导电性和较高的吸附/解离水分子的活化能势垒，限制了它在碱性HER中的应用。本文采用水热法在三维导电碳纸（CP）上均匀生长二硫化钼，呈现纳米花状，有效提高了电极的导电性。随后，通过二次水热法将NiSe2以纳米粒子的形式生长在MoS2纳米花上，形成MoS2/NiSe2/CP纳米复合结构。采用x射线衍射（XRD）、x射线光电子能谱（XPS）、扫描电镜（SEM）和透射电镜（TEM）对MoS2/ nis2 /CP的结构和形貌进行了表征。结果表明，二硫化钼是由纳米薄片组合而成的纳米花状结构。纳米花的平均直径约为1.3±0.2 μm。nis2纳米颗粒均匀生长在MoS2纳米花上，平均粒径为30-100 nm，提供了更大的比表面积，暴露了更多的反应位点。MoS2/NiSe2异质界面有利于电子再分配，XPS峰位移Mo 3d: + 0.4 eV；S 2p: + 0.3 eV。协同结构提供了比MoS2/CP更高的电化学表面积（ECSA）。nis2的引入有效抑制了MoS2的团聚，增强了催化剂在基体上的分散性，增加了有效反应面积。MoS2/ nis2 /CP在电流密度为−10 m cm−2时，过电位仅为112 mV，塔菲尔斜率为42.01 mV dec - 1。nis2纳米粒子的引入有效地促进了水吸附/裂化反应，从而与MoS2共催化HER，表现出良好的稳定性。图形抽象

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引用次数: 0

Impact of Water Content on UiO-66 Synthesis and Catalyst Activation in Pd/UiO-66 Catalyzed Methyl Nitrite Carbonylation to Dimethyl Carbonate 水含量对UiO-66合成及Pd/UiO-66催化亚硝酸盐甲酯羰基化制碳酸二甲酯催化剂活化的影响

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-20 DOI: 10.1007/s10562-025-05178-3

Qiuyun Huang, Shiyu Liu, Weihua Shen, Yunjin Fang

Due to the modifiable properties and excellent stability, metal-organic frameworks (MOFs) are considered potential catalyst supports in heterogeneous reactions. UiO-66 with varying water contents were synthesized as supports of Pd for the carbonylation of methyl nitrite (MN) to dimethyl carbonate (DMC). In accordance with XRD, NH₃-TPD, and SEM, the water contents showed a negative correlation on the amounts of acid sites and accelerated crystal aggregation. The Pd/UiO-66(x) demonstrated perfect selectivity of DMC (> 99%) and good CO conversion which were increased with the decrease of water contents. Moreover, the catalysts deactivated at the beginning of the reaction, and the catalytic deactivation was due to the damage of the C = O structure in UiO-66 frameworks. This work revealed the influence of water contents on the synthesis of UiO-66 and the deactivation process of MOF-based catalysts in MN carbonylation to DMC.

Graphical Abstract

由于金属有机骨架具有可修饰的性质和优异的稳定性，被认为是多相反应中潜在的催化剂载体。合成了不同含水量的UiO-66作为钯的载体，用于亚硝酸盐甲酯（MN）羰基化制碳酸二甲酯（DMC）。XRD、NH3-TPD和SEM分析表明，水的含量与酸位的数量和晶体加速聚集呈负相关。Pd/UiO-66(x)对DMC具有良好的选择性（> 99%）， CO转化率随含水量的降低而提高。催化剂在反应开始时失活，失活的原因是UiO-66框架中C = O结构的破坏。本工作揭示了水含量对UiO-66合成的影响以及mof基催化剂在MN羰基化制DMC过程中的失活过程。图形抽象

引用次数: 0

Correlation between Surface Pt-Ru Bonding and CO Tolerance of PtRu/C PEFC Anode Catalysts Prepared Using a Relatively Large Surface Area Carbon Support 采用较大表面积碳载体制备的PtRu/C PEFC阳极催化剂表面Pt-Ru键合与CO耐受性的关系

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-20 DOI: 10.1007/s10562-025-05177-4

Tatsuya Takeguchi, Pongtorn Dhupatemiya, Napan Narischat, Garavdorj Batnyagt, Thidarat Wongsawa, Shin R. Mukai

We prepared PtRu/C anode catalysts for PEFCs with Ru: Pt molar ratios of 1.0, 1.3, and 2.0, supported on two types of Ketjen Black carbon (KB800 and KB1600) with surface areas of 789 and 1627 m²g^{– 1}, respectively. The PtRu particles supported on KB1600 were smaller than those supported on KB800 because of their larger surface areas. Characterization using N₂ adsorption, TEM, CO tolerance, CO stripping, and in situ X-ray absorption fine structure (XAFS) revealed well-alloyed Pt-Ru structures, providing CO adsorption sites of approximately 80–100 m²g_PtRu^{– 1}. Among the catalysts, PtRu_1.3/KB1600 exhibited the highest CO tolerance, maintaining about 0.73 V at 1000 ppm CO, outperforming a commercial catalyst (0.47 V). The differences in CO tolerance were linked to the number of active CO oxidation sites, as determined by CO stripping. Because only surface Pt-Ru bonding contributes to CO oxidation, whereas surface Ru-Ru bonding does not, the ECSA for Pt-Ru bonding of each catalyst was calculated from the results of CO stripping and in situ XAFS. This parameter can be used as a key factor in evaluating or predicting the CO tolerance of PtRu catalysts and can be optimized through proper selection of the carbon support.

Graphical Abstract

Finely dispersed PtRu₁.₃ nanoparticles on high-surface-area carbon showing enhanced CO tolerance

制备了Ru: Pt摩尔比分别为1.0、1.3和2.0的pefc PtRu/C阳极催化剂，载体为两种表面积分别为789和1627 m2 - 1的Ketjen黑碳（KB800和KB1600）。KB1600上的PtRu颗粒比KB800上的PtRu颗粒小，因为它们的表面积更大。通过N2吸附、TEM、CO耐受性、CO剥离和原位x射线吸收精细结构（XAFS）表征，发现Pt-Ru结构合金化良好，CO吸附位约为80-100 m2gPtRu - 1。其中，PtRu1.3/KB1600对CO的耐受性最高，在1000ppm CO下仍能维持0.73 V左右，优于商用催化剂（0.47 V）。CO耐受性的差异与活性CO氧化位点的数量有关，这是由CO剥离确定的。由于只有表面的Pt-Ru键合对CO氧化有贡献，而表面的Ru-Ru键合对CO氧化没有贡献，所以每种催化剂的Pt-Ru键合的ECSA是根据CO剥离和原位XAFS的结果计算的。该参数可作为评价或预测PtRu催化剂CO耐受性的关键因素，并可通过合理选择碳载体进行优化。精细分散的PtRu 1。高表面积碳上的₃纳米颗粒表现出增强的CO耐受性

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引用次数: 0

Ternary Z-Scheme Ag/TiO₂/g-C₃N₄ Nanocomposite for Enhanced Visible-Light Photocatalytic Reduction of p-Nitrophenol 三元Z-Scheme Ag/TiO₂/g-C₃N₄纳米复合材料增强可见光催化还原对硝基苯酚

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2025-09-20 DOI: 10.1007/s10562-025-05128-z

Hamza El-Hosainy, Alaa A. Alhashash, Abd El-Motaleb M. Ramadan, Ezz-Elregal M. Ezz-Elregal, Rafat Tahway, Maged El-Kemary

In this study, a novel biphasic anatase/brookite TiO₂ was successfully deposited onto g-C₃N₄ via an impregnation method, followed by the photodeposition of Ag nanoparticles to construct a ternary Ag/TiO₂/g-C₃N₄ nanocomposite. Detailed physicochemical characterizations confirmed the successful immobilization of Ag nanoparticles on the TiO₂/g-C₃N₄ surface, contributing to a significantly enhanced surface area, broadened visible light absorption, and improved charge carrier separation. The photocatalytic performance of the resulting nanocomposites was evaluated through the reduction of p-nitrophenol (PNP) to p-aminophenol (PAP), revealing a remarkable enhancement in activity with increasing Ag content. Notably, the 2% Ag/TiO₂/g-C₃N₄ nanocomposite achieved complete (98%) conversion of PNP to PAP within just 6.5 min under visible light irradiation. This performance was approximately three times higher than that of 0.5% Ag/TiO₂/g-C₃N₄, twice that of 2% Ag/TiO₂ (commercial)/g-C₃N₄, and significantly superior to bare TiO₂/g-C₃N₄. The outstanding photocatalytic efficiency of the 2% Ag/TiO₂/g-C₃N₄ system is attributed to its superior light-harvesting ability and efficient charge separation via a Z-scheme mechanism. These findings present a promising and scalable strategy for engineering advanced ternary nanocomposite photocatalysts with enhanced environmental remediation capabilities.

Graphical Abstract

在本研究中，通过浸渍法制备了一种新型的双相锐钛矿/板岩tio_2在g-C₃N₄上，然后光沉积了Ag纳米粒子，构建了三元Ag/ tio_2 /g-C₃N₄纳米复合材料。详细的物理化学表征证实了Ag纳米颗粒在TiO₂/g-C₃N₄表面的成功固定，有助于显著增加表面积，扩大可见光吸收，并改善电荷载流子分离。通过将对硝基酚（PNP）还原为对氨基酚（PAP）来评估所得到的纳米复合材料的光催化性能，发现随着银含量的增加，活性显著增强。值得注意的是，2% Ag/TiO₂/g-C₃N₄纳米复合材料在可见光照射下仅在6.5 min内就实现了PNP到PAP的完全（98%）转化。该性能大约是0.5% Ag/TiO₂/g-C₃N₄的3倍，是2% Ag/TiO₂（商业）/g-C₃N₄的2倍，明显优于裸TiO₂/g-C₃N₄。2% Ag/TiO₂/g-C₃N₄体系具有优异的光催化效率，主要归功于其优异的光收集能力和通过Z-scheme机制实现的高效电荷分离。这些发现为具有增强环境修复能力的先进三元纳米复合光催化剂的工程设计提供了一种有前途和可扩展的策略。图形抽象

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引用次数: 0