Catalysis Letters最新文献_第3页

Facile Synthesis of MnO2 Catalysts on 3D Nickel Foam for Efficient Degradation of Rhodamine B by Activating Peroxymonosulfate 活化过氧单硫酸酯制备三维泡沫镍表面二氧化锰催化剂高效降解罗丹明B

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05275-3

Zhimin Li, Tong Guan, Hangyu Shi, Chuan Wang, Xue Peng, Shumin Wang

Advanced oxidation process for water purification is a promising environmental remediation method, but its application is hindered by the difficulty of rapid recovery and reuse of catalysts. Herein, potassium permanganate (KMnO₄) was used as the primary material to synthesize MnO₂ nanosheets on the surface of 3D nickel foam (MnO₂@NF) through a simple hydrothermal method. A comprehensive analysis of the growth mechanism of MnO₂ nanosheets on NF was conducted and the catalytic properties of MnO₂@NF were systematically explored. After activating peroxymonosulfate (PMS) with MnO₂@NF, the degradation of rhodamine B (RhB) was promoted, and the degradation performance was impressive, with a removal efficiency of over 92% within 60 min. The studies revealed that MnO₂@NF exhibits high catalytic cycling stability, excellent morphological and valence state stability in the treatment of RhB wastewater. Besides, based on UV-Vis absorption spectrum, quenching experiments and electron paramagnetic resonance tests, the oxidative degradation of RhB is achieved by activating PMS with MnO₂ to generate non-free radicals (¹O₂) and free radicals (•OH, and SO₄^•−). These results demonstrate that MnO₂@NF is an effective catalyst for application in real wastewater treatment.

Graphical Abstract

深度氧化法用于水净化是一种很有前途的环境修复方法，但催化剂难以快速回收和再利用，阻碍了其应用。本文以高锰酸钾（KMnO4）为主要材料，通过简单的水热法在三维泡沫镍（MnO2@NF）表面合成二氧化锰纳米片。全面分析了二氧化锰纳米片在纳滤膜上的生长机理，系统探讨了MnO2@NF的催化性能。用MnO2@NF活化过氧单硫酸根（peroxymonosulfate， PMS）后，促进了对罗丹明B （rhodamine B, RhB）的降解，降解效果显著，60 min内去除率可达92%以上。研究表明，MnO2@NF在处理RhB废水中表现出较高的催化循环稳定性、良好的形态和价态稳定性。此外，通过紫外-可见吸收光谱、猝灭实验和电子顺磁共振测试可知，通过MnO2活化PMS生成非自由基（1O2）和自由基（•OH和SO4•−），实现了RhB的氧化降解。这些结果表明MnO2@NF是一种有效的催化剂，可以应用于实际的废水处理。图形抽象

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引用次数: 0

Selective Conversion of 4-Hydroxy-3-hexanone to 4-Hexen-3-one Over γ-Al2O3 Based Composite Oxides 4-羟基-3-己酮在γ-Al2O3基复合氧化物上选择性转化为4-己烯-3- 1

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05289-x

Guangjie Hu, Mingming Li, Yiling Li, Zhihui Cheng, Xiao-Xuan Li, Yi-Si Feng

α, β-Unsaturated enones are significant intermediates in the synthesis of fragrances and pharmaceuticals, therefore, the development of efficient, environmentally friendly, and cost-effective synthetic methodologies holds considerable practical value. In this work, the composite metal oxide catalyst ZrO₂/Al₂O₃ was synthesized by the co-precipitation method, and the crystal phase, acid-base sites, and pore structure of ZrO₂/Al₂O₃ were studied using characterization methods such as TG, SEM, XRD, XPS, BET, and TPD. Under optimized reaction conditions (N₂ atmosphere, pressure: 0.1 MPa, 310 °C, 3 h, 10 g, mass space velocity: 2.27 h^− 1), the ZrO₂/Al₂O₃ (Zr: Al = 3:7, co-precipitation pH = 9, 550 °C annealing) catalyst exhibits remarkable catalytic performance—achieving up to 93.5% conversion of 4-Hydroxy-3-hexanone(HH) and 72.6% selectivity of 4-hexen-3-one (HO).

Graphical Abstract

α， β-不饱和烯酮是香料和药物合成中重要的中间体，因此，开发高效、环保、经济的合成方法具有重要的实用价值。本文采用共沉淀法合成了复合金属氧化物催化剂ZrO2/Al2O3，并采用TG、SEM、XRD、XPS、BET、TPD等表征方法研究了ZrO2/Al2O3的晶相、酸碱位和孔隙结构。在优化反应条件（N2气氛，压力：0.1 MPa, 310℃，3 h, 10 g，质量空速：2.27 h−1）下，ZrO2/Al2O3 （Zr: Al = 3:7，共沉淀pH = 9, 550℃退火）催化剂表现出优异的催化性能，4-羟基-3-己酮（HH）的转化率高达93.5%，4-己烯-3-酮（HO）的选择性高达72.6%。图形抽象

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引用次数: 0

The Role of Manganese in CeNi1−xMnxO3 Nano-Crystalline Perovskites for Dry Reforming of Methane to Produce Syngas 锰在CeNi1−xMnxO3纳米晶钙钛矿中对甲烷干重整制合成气的作用

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05270-8

Ouarda Benlounes, Kahina Ikkour, Djamila Sellam, Mourad Halouane, Nora Yahi, Juliette Blanchard, Saremblé Kone Guira

CeNiO₃ catalyst and its modification with manganese were investigated for dry Reforming of methane reaction. The experiments were performed at 700 °C to examine the effect of manganese loading on catalyst activity and stability. A series of ternary perovskite-type oxides CeNi_1−xMn_xO₃ (x = 0, 0.2, 0.4, and 0.6) was synthesized by the self-combustion method. These samples were analyzed by several techniques, including X-ray diffraction, infrared spectroscopy, N₂ adsorption-desorption isotherm, scanning electron microscope, temperature programmed reduction (TPR) and thermogravimetric (TGA) analysis. The characterization results revealed the presence of the crystalline perovskite phase for all catalysts and an appropriate elemental composition. Catalytic activity decreased with increasing Mn content, with CeNiO₃ showing the highest conversion due to the high reducibility of Ni as indicated by the TPR analysis. While partial substitution of Ni by Mn was found to be highly beneficial in terms of stability. A carbon balance (Xc) equal to 100% was obtained over the substituted catalysts CeNi_1−xMn_xO₃ (x = 0.2, 0.4 and 0.6). This finding was further supported by thermogravimetric analysis (TGA) after 24 h of reaction, which revealed significant coke deposition (~ 25%) on the CeNiO₃ catalyst. In contrast, no carbon deposition was detected on the CeNi_0.4M_0.6O₃.

Graphical Abstract

研究了甲烷干重整反应的CeNiO3催化剂及其锰改性。实验在700℃下进行，考察了锰负载对催化剂活性和稳定性的影响。采用自燃法合成了一系列钙钛矿型三元氧化物CeNi1−xMnxO3 （x = 0、0.2、0.4和0.6）。采用x射线衍射、红外光谱、N2吸附-解吸等温线、扫描电镜、程序升温还原（TPR）和热重（TGA）等技术对样品进行了分析。表征结果表明，所有催化剂均存在晶体钙钛矿相，且元素组成合适。随着Mn含量的增加，催化活性降低，TPR分析表明，由于Ni的高还原性，CeNiO3的转化率最高。而用Mn部分取代Ni在稳定性方面是非常有益的。在取代的催化剂CeNi1−xMnxO3 （x = 0.2, 0.4和0.6）上，碳平衡（Xc）等于100%。反应24 h后的热重分析（TGA）进一步支持了这一发现，发现CeNiO3催化剂上有明显的焦炭沉积（~ 25%）。相比之下，在CeNi0.4M0.6O3上没有检测到碳沉积。图形抽象

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引用次数: 0

Microwave-Assisted Biodiesel Production from Non-edible Neem Oil Using KOH@GO Catalyst Synthesized Via Modified Hummer’s Method 通过改进的Hummer方法合成的KOH@GO催化剂，微波辅助非食用印楝油生产生物柴油

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05274-4

Devarshi P. Tadvi, Heena N. Katariya, Milap G. Nayak, Kamlesh Gurjar

The present research addresses key barriers in converting high-FFA, non-edible oils like neem into biodiesel, mainly low yields and process inefficiency using conventional catalysts and heating methods. Study reports a novel approach utilizing a graphene oxide based heterogeneous catalyst (KOH@GO), synthesised by a modified Hummer’s method, for the production of biodiesel from non-edible neem oil. For efficient transesterification, initially, the high free fatty acid (FFA) content of neem oil was reduced via esterification to lower its acid value. Subsequently, a microwave- assisted transesterification was adopted to enhance reaction kinetics and energy efficiency. Significant reaction parameters including methanol-to-oil molar ratio, reaction time, catalyst loading, and temperature, were systematically optimized to study their effects on production efficiency. This innovation enables efficient, high-yield biodiesel production while enhancing catalyst reusability and reducing energy input, thus offering a scalable and sustainable alternative for biodiesel production from challenging feedstocks.

Graphical Abstract

目前的研究解决了将高游离脂肪酸、非食用油（如楝树油）转化为生物柴油的主要障碍，主要是产率低和使用传统催化剂和加热方法的工艺效率低。研究报告了一种利用基于氧化石墨烯的多相催化剂（KOH@GO）的新方法，该方法由改进的悍马方法合成，用于从不可食用的楝树油中生产生物柴油。为了实现高效酯交换反应，首先通过酯化反应降低印楝油中游离脂肪酸（FFA）的含量，降低其酸值。随后，采用微波辅助酯交换反应来提高反应动力学和能量效率。系统优化了醇油摩尔比、反应时间、催化剂负载、温度等重要反应参数对生产效率的影响。这一创新能够高效、高产地生产生物柴油，同时提高催化剂的可重复使用性，减少能源投入，从而为具有挑战性的原料生产生物柴油提供了一种可扩展和可持续的替代方案。图形抽象

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引用次数: 0

Towards Sustainable Biocatalysis: A Novel Thermostable Raw Starch-Digesting Amylase from Bacillus Cereus as a Green and Eco-Friendly Alternative for Starch Processing 迈向可持续的生物催化：蜡样芽孢杆菌的一种新型热稳定的原淀粉消化淀粉酶作为一种绿色环保的淀粉加工替代品

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05291-3

Bouthaina Ben Hadj Hmida, Sameh Ben Mabrouk, Monia Blibech, Adel Sayari, Aida Hmida-Sayari

Starch is a vital raw material for numerous industries, but conventional processing methods are energy-intensive and environmentally detrimental. Raw starch-digesting amylases provide a sustainable alternative by directly hydrolyzing raw starch at temperatures below its gelatinization point. A novel raw starch-digesting α-amylase (Amy-38) from Bacillus cereus spH1 was purified to homogeneity after ammonium sulfate precipitation and gel filtration, achieving a 17.8-fold purification and 12.3% yield. The purified amylase presents a molecular weight of 68 kDa, with optimal activity at pH 7.0 and 60 °C. Optimal stability was observed at pH levels of 6.0–7.5 and temperatures of 40–55 °C. The enzyme retained 90% or 85% of its activity after 30 min incubation at pH 7.5 or 45 °C, respectively. Moreover, Ca²⁺ was the most effective activator for Amy-38 (224%) followed by Mg²⁺ (176%). The amylase exhibited specificity for starch, with average Km and Vmax values of 18.18 mg/mL and 72.99 µmol/min/mL, respectively. The hydrolysis of raw wheat starch was optimized using Response Surface Methodology. Using 5% native wheat starch, 52.14% reducing sugars were produced at 60 °C for 3 h, eliminating the need for energy-intensive gelatinization. These results demonstrate that Amy-38 is a potent catalyst for efficient hydrolysis of raw starch, positioning it as a promising and sustainable biocatalyst for industrial applications.

Graphical Abstract

淀粉是许多工业的重要原料，但传统的加工方法是能源密集型的，对环境有害。原料淀粉消化淀粉酶通过在低于其糊化点的温度下直接水解原料淀粉，提供了一种可持续的替代方法。从蜡样芽孢杆菌spH1中分离纯化了一种新的原淀粉消化α-淀粉酶（Amy-38），经硫酸铵沉淀和凝胶过滤后纯度达到了17.8倍，产率达到了12.3%。纯化的淀粉酶分子量为68 kDa，在pH 7.0和60°C条件下具有最佳活性。pH值为6.0-7.5，温度为40-55°C，稳定性最佳。在pH 7.5或45°C孵育30分钟后，酶的活性分别保持了90%或85%。此外，Ca 2 +是Amy-38最有效的活化剂（224%），其次是Mg 2 +(176%)。淀粉酶对淀粉具有特异性，平均Km和Vmax值分别为18.18 mg/mL和72.99µmol/min/mL。采用响应面法对小麦淀粉的水解工艺进行了优化。使用5%的天然小麦淀粉，在60°C下发酵3 h，产生52.14%的还原糖，消除了能量密集型糊化的需要。这些结果表明，Amy-38是一种高效水解原料淀粉的有效催化剂，将其定位为一种有前途的可持续生物催化剂，可用于工业应用。图形抽象

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引用次数: 0

Morphology-Controlled ZIF-67 Derived Co@NC Catalysts for Ammonia Decomposition 形态控制的ZIF-67衍生Co@NC氨分解催化剂

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05288-y

Wenbo Wang, Yanping Yuan, Yanjun Gao, Zhiyong Wang

Ammonia decomposition is a promising route for carbon-free hydrogen production, However, the development of efficient and durable non-noble metal catalysts remains challenging owing to issues such as metal sintering. Herein, we demonstrate that precursor morphology engineering is an effective strategy for addressing this limitation. By modulating the solvent system, three distinct ZIF-67 morphologies (platelet (P-), sheet (S-), and rhombic dodecahedron (R-)) were synthesized and subsequently pyrolyzed into the corresponding Co@NC catalysts. Among them, R-Co@NC exhibited a superior hierarchical micro-mesoporous N-doped carbon framework with homogeneously dispersed Co nanoparticles and abundant Co-N active sites, leading to superior catalytic performance: 82.43% NH₃ conversion at 500 ℃ and a hydrogen production rate of 27.58 mmol H₂ g⁻¹ cat min⁻¹. Moreover, R-Co@NC exhibited exceptional stability, maintaining ~ 89% conversion over 200 h at 600 ℃. Combined with the conductive carbon framework, the synergistic effect between metallic Co and Co-N sites facilitate N-H bond cleavage and N-N coupling. This study presents the importance of controlling precursor morphology in the design of advanced catalysts for ammonia decomposition.

Graphical Abstract

氨分解是一种很有前途的无碳制氢途径，然而，由于金属烧结等问题，开发高效耐用的非贵金属催化剂仍然具有挑战性。在此，我们证明了前驱体形态学工程是解决这一限制的有效策略。通过调节溶剂体系，合成了三种不同形态的ZIF-67（血小板（P-），片状（S-）和菱形十二面体（R-）），并将其热解成相应的Co@NC催化剂。其中R-Co@NC表现出优异的分层微介孔掺n碳骨架结构，具有均匀分散的Co纳米颗粒和丰富的Co- n活性位点，具有优异的催化性能：500℃下NH3转化率为82.43%，产氢速率为27.58 mmol H2 g−1 cat min−1。此外，R-Co@NC表现出优异的稳定性，在600℃加热200 h，转化率保持在~ 89%。结合导电碳骨架，金属Co和Co- n位点之间的协同作用促进了N-H键的解理和N-N的偶联。本研究提出了控制前驱体形态在设计高级氨分解催化剂中的重要性。图形抽象

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引用次数: 0

Nitrogen-Doped Carbon-Coated Al2O3 Supported Cobalt Fischer-Tropsch Catalysts: Boosting Durability and Olefins Selectivity 氮掺杂碳包覆Al2O3负载钴费托催化剂：提高耐久性和烯烃选择性

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05277-1

Lili Wu, Shuying Ren, Chengchao Liu

Alkali metal modification of cobalt-based Fischer-Tropsch synthesis catalysts suffers from poor stability. Exploring new strategies to enhance olefin selectivity and catalyst stability is of significant importance. In this work, a nitrogen-doped carbon layer-modified Co/NC-Al₂O₃ catalyst was prepared using oleylamine as the nitrogen source and glucose as the carbon source. Under conditions of 230 ℃, 1 MPa, and 6 SL·g^− 1·h^− 1, the Co/NC-Al₂O₃ catalyst achieved an activity of 4.2 × 10^− 5 molCO·gCo^− 1 s^− 1 with an olefin selectivity of 34.4%, while exhibiting high stability. Characterization and performance results demonstrate that: the electron-donating effect of pyrrolic nitrogen enriches electrons in adjacent metallic Co, enhancing CO adsorption and activation while inhibiting secondary hydrogenation of α-olefins, thereby increasing olefin selectivity; The improved stability originates from the confinement effect of the carbon layer and the stabilizing role of graphitic nitrogen on Co nanoparticles.

Graphical Abstract

碱金属改性钴基费托合成催化剂稳定性差。探索提高烯烃选择性和催化剂稳定性的新策略具有重要意义。本研究以油胺为氮源，葡萄糖为碳源，制备了氮掺杂碳层修饰的Co/NC-Al2O3催化剂。在230℃、1 MPa、6 SL·g−1·h−1条件下，Co/ nm - al2o3催化剂的活性为4.2 × 10−5 molCO·gCo−1 s−1，烯烃选择性为34.4%，稳定性良好。表征和性能结果表明：吡咯氮的给电子作用富集了相邻金属Co中的电子，增强了Co的吸附和活化，抑制了α-烯烃的二次加氢反应，从而提高了烯烃的选择性；稳定性的提高源于碳层的约束作用和石墨氮对Co纳米颗粒的稳定作用。图形抽象

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引用次数: 0

Constructing ZnCoFe@NiS/NF Micro-flower Structure as Highly Efficient Electrocatalysts for Overall Water Splitting 构建ZnCoFe@NiS/NF微花结构高效电催化整体水分解

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05278-0

Shilong Zhou, Dongbo Li, Guo Zhang, Jinglong Xing, Chengqiang Ying, Kai Li, Yi Sun, Yan Hong, Yueming Li

The development of efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements to facilitate both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in water splitting still presents considerable challenges. In this work, a ZnCoFe@NiS/NF catalyst featuring a three-dimensional spherical micro-flower structure supported on nickel foam was successfully prepared through a simple, multi-step hydrothermal synthesis method. Owing to its significantly enhanced specific surface area, abundance of active sites, and superior electron conductivity, the ZnCoFe@NiS/NF catalyst demonstrates outstanding bifunctional catalytic performance in 1 M KOH. At a current density of 10 mA cm^− 2, the overpotential is as low as 170 mV for the OER and 178 mV for the HER. Specifically, an overall water splitting electrolyzer constructed from ZnCoFe@NiS/NF requires only a remarkably low operating voltage of 1.52 V to achieve a current density of 10 mA cm^− 2, surpassing the performance of the majority of reported bifunctional metal sulfide electrocatalysts. Furthermore, the catalyst operates at a similarly low voltage of 1.72 V and maintains stability for more than 100 h at a current density of 50 mA cm^− 2. This work not only reveals the critical importance of controlling morphology and electronic properties for enhancing the kinetics of electrocatalytic reactions, but also offers a simple and effective synthetic route for the large-scale production of high-performance and highly stable overall water splitting electrocatalysts.

Graphical Abstract

开发高效、稳定的富地元素双功能电催化剂，促进析氧反应（OER）和析氢反应（HER）在水裂解过程中的发生，仍然是一个相当大的挑战。本文通过简单的多步水热合成方法，成功制备了泡沫镍支撑的三维球形微花结构ZnCoFe@NiS/NF催化剂。ZnCoFe@NiS/NF催化剂具有显著提高的比表面积、丰富的活性位点和优异的电子导电性，在1 M KOH条件下表现出优异的双功能催化性能。当电流密度为10 mA cm−2时，OER和HER的过电位分别低至170 mV和178 mV。具体来说，由ZnCoFe@NiS/NF构建的整体水分解电解槽只需要1.52 V的非常低的工作电压就可以实现10 mA cm−2的电流密度，超过了大多数报道的双功能金属硫化物电催化剂的性能。此外，该催化剂在1.72 V的低电压下工作，并在50 mA cm−2的电流密度下保持100小时以上的稳定性。这项工作不仅揭示了控制形貌和电子性质对提高电催化反应动力学的重要性，而且为大规模生产高性能、高稳定性的整体水分解电催化剂提供了一条简单有效的合成途径。图形抽象

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引用次数: 0

Electrocatalytic Hydrogen Evolution Reaction of A2B-Type Triaryl Corrole Copper Complexes a2b型三芳基络合物铜的电催化析氢反应

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05285-1

Yu-Jun Shao, De-Yu Guo, Feng Li, Hao Zhang, Yan-Mei Sun, Li-Ping Si, Hai-Yang Liu

Three A₂B-type triaryl corrole copper complexes bearing p–nitrobenzyl (1), p–methylsulfonylphenyl (2), and p–hydroxyphenyl (3) at the 10–position and pentafluorophenyl at 5- and 15-position were prepared (in which 2 is a new complex), and their electrocatalytic hydrogen evolution reaction in organic and neutral aqueous media was also investigated. The results showed that these three copper corroles exhibited good catalytic HER activity in both organic and neutral aqueous systems. Catalytic efficiency follows the order of 2 > 1 > 3, showing the stronger electron–withdrawing group can enhance more of the catalytic activity of the complexes. In organic phase, when using trifluoroacetic or ptoluenesulfonic acid as the proton source, the catalytic process may proceed via an EECC (E: electron transfer, C: proton coupling) pathway. Complex 2 had a turnover frequency up to 361.9 h^− 1 in neutral aqueous media at an overpotential of 1338 mV and exhibited excellent stability during the electrolysis.

制备了3个a2b型三芳基铜配合物，其中10位对硝基苯(1)、对甲基磺酰基苯基(2)和对羟基苯基(3)，5位和15位五氟苯基（其中2为新配合物），并研究了它们在有机和中性水介质中的电催化析氢反应。结果表明，这三种铜催化剂在有机和中性水体系中均表现出良好的HER催化活性。催化效率依次为2 >； 1 > 3，说明吸电子基团越强，配合物的催化活性越强。在有机相中，当以三氟乙酸或甲苯磺酸作为质子源时，催化过程可能通过EECC （E：电子转移，C：质子偶联）途径进行。配合物2在中性水介质中，过电位为1338 mV时的周转频率高达361.9 h−1，在电解过程中表现出优异的稳定性。

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引用次数: 0

Structural and Optical Engineering of Bi2O3 Nanostructures for Enhanced Visible-Light Photocatalysis 增强可见光光催化的Bi2O3纳米结构的结构与光学工程

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters

Pub Date : 2026-01-03 DOI: 10.1007/s10562-025-05262-8

Ahmed M. Ajam, Khalid Haneen Abass

This study demonstrated the successful preparation of bismuth oxide (Bi₂O₂ NPs) using the co-precipitation method. XRD results demonstrated the formation of a pure and stable crystalline phase with an average crystallite size of 21.17 nm this increases the effective surface area for photochemical reactions, while SEM images revealed a quasi-spherical morphology with an average particle size of about 64 nm, which is favorable for increasing the effective surface area. FTIR spectra supported the presence of Bi–O and Bi–O–Bi bonds and the appearance of active surface hydroxyl groups, which enhance the chances of forming active radicals during the photocatalytic reaction. The optical properties also showed an energy band gap (≈ 2.75 eV) consistent with that reported in the literature, making Bi₂O₂ a promising candidate for photocatalysis. Photocatalytic tests using methylene blue dye showed an initial sharp decrease in absorption due to rapid absorption on the catalyst surface, followed by gradual photolysis due to the formation of electron and hole pairs and the production of reactive oxygen species. This demonstrated the catalyst’s excellent ability to remove organic pollutants under visible light, with consistent efficiency across multiple cycles, indicating its robustness and sustainability. These results highlight the potential of Bi₂O₃ nanoparticles as effective and promising catalysts for environmental applications and pollutant treatment.

Graphical Abstract

本研究证明了用共沉淀法成功制备了氧化铋（Bi2O2 NPs）。XRD结果表明，形成了纯净稳定的晶相，平均晶粒尺寸为21.17 nm，增加了光化学反应的有效比表面积；SEM图像显示，晶相呈准球形，平均粒径约为64 nm，有利于增加有效比表面积。FTIR光谱支持了Bi-O和Bi-O - bi键的存在以及活性表面羟基的出现，这增加了光催化反应中形成活性自由基的机会。光学性质也显示出与文献报道一致的能带隙（≈2.75 eV），使Bi2O2成为光催化的有希望的候选者。使用亚甲基蓝染料进行光催化试验表明，由于催化剂表面的快速吸收，吸收最初急剧下降，随后由于电子和空穴对的形成以及活性氧的产生而逐渐光解。这证明了催化剂在可见光下去除有机污染物的卓越能力，在多个循环中具有一致的效率，表明其稳健性和可持续性。这些结果突出了Bi2O3纳米颗粒作为环境应用和污染物处理的有效催化剂的潜力。图形抽象

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引用次数: 0