Catalysis Today最新文献

Green approaches to nickel oxide nanoparticles: Visible-light-driven photocatalytic degradation of brilliant green, methyl orange dyes and antibiotic ciprofloxacin 氧化镍纳米颗粒的绿色途径：可见光驱动光催化降解亮绿、甲基橙染料和抗生素环丙沙星

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.cattod.2026.115696

Ishita Kapil , Pinky Yadav , Sachin Vats , Gourav Sharma , Anchita Das , Sambhunath Bera , Mrinal Dutta , Ayana Bhaduri

This work demonstrates a sustainable green synthesis of nickel oxide (NiO) nanoparticles using plant extracts from neem (Azadirachta indica), guava (Psidium guajava), and onion peel (Allium cepa), yielding NiO-N, NiO-G, and NiO-O respectively. The nanoparticles exhibited strong visible-light absorption, favorable morphology, high crystallinity, and crystallite sizes of 23 nm (NiO-N), 15 nm (NiO-G), and 13 nm (NiO-O) with surface areas of 64.17, 38.44 and 39.85 m²/g. Advanced characterizations (XRD, UV-Vis, PL, Raman, FESEM, FTIR, Zeta potential, XPS, BET) confirmed NiO nanoparticles formation, Ni-rich surface regions, and mixed-valence Ni²⁺/Ni³ ⁺ states enriched with oxygen vacancies. Photocatalytic studies under visible and natural sunlight revealed efficient degradation of Methyl Orange (89–96 %), Brilliant Green (87–90 %), and Ciprofloxacin (65–78.2 %), with enhanced performance in sunlight (up to 98 % for MO, 94 % for BG, and 85 % for CIF) within 160 mins. Radical scavenging experiments identified •OH as the dominant reactive species, supported by h⁺ and e⁻ contributions. The catalysts exhibited high stability and reusability, with only 7 % efficiency loss after four cycles. These findings highlight the potential of green-synthesized NiO nanoparticles as robust, eco-friendly photocatalysts for sustainable wastewater treatment.

本研究展示了利用印度楝树（Azadirachta indica）、番石榴（Psidium guajava）和洋葱皮（Allium cepa）的植物提取物可持续绿色合成氧化镍（NiO）纳米颗粒，分别产生NiO- n、NiO- g和NiO- o。纳米颗粒具有较强的可见光吸收，良好的形貌，高结晶度，晶粒尺寸分别为23 nm (NiO-N), 15 nm （NiO-G）和13 nm (NiO-O)，表面积分别为64.17,38.44和39.85 m²/g。高级表征（XRD、UV-Vis、PL、Raman、FESEM、FTIR、Zeta电位、XPS、BET）证实了NiO纳米颗粒的形成、富Ni的表面区域以及混合价Ni 2 + /Ni³ +富含氧空位的状态。在可见光和自然光下的光催化研究表明，甲基橙（89-96 %）、亮绿（87-90 %）和环丙沙星（65 - 78.2% %）的有效降解，在阳光下的性能在160 分钟内得到增强（MO高达98 %，BG为94 %，CIF为85 %）。自由基清除实验发现•OH是主要的活性物质，h⁺和e⁻也有贡献。催化剂具有较高的稳定性和可重复使用性，经过4次循环后，效率损失仅为7 %。这些发现突出了绿色合成的NiO纳米颗粒作为可持续废水处理的强大、环保光催化剂的潜力。

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引用次数: 0

Forced concentration cycling of methane and air over Ni(-C)/NiAl2O4 produces less syngas with increasing pressure 甲烷和空气在Ni(c)/NiAl2O4上强制浓度循环产生的合成气随着压力的增加而减少

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.cattod.2026.115698

Nooshin Moradi , Dominic Eames , Daria C. Boffito , Federico Galli , Gregory S. Patience

Syngas is a feedstock for platform chemicals and fuels like methanol, ammonia and hydrocarbon liquids via Fischer–Tropsch synthesis. Chemical looping reforming has been under development for decades to produce syngas and comprises two interconnected vessels that cycle between a net reduction atmosphere and a net oxidation atmosphere. Rather than cycling solids, switching the gas feeds is an alternative approach to forced concentration cycling. Here, we tested a fixed bed reactor containing 5 g of Ni/NiAl₂O₄ as the catalyst, which alternated between NiC (reduction step) and Ni (oxidation step). A 4-way valve fed methane at

0.15 L / min

during the reduction cycle and 21% O₂/Ar mixture during the oxidation cycle, each cycle lasting 2 min. Methane conversion reached 98% above 800 °C and 0.1 MPa but to 75% at 2 MPa. Concurrently, the H₂ and CO selectivity also decreased. At all of the operating conditions, H₂ was the dominant product during the reduction cycle and CO predominated during the oxidation cycle. Over the course of a 6 h experiment, the H₂ and CO yield remained constant. Additionally, the residence time distribution analysis suggests the reactor operated in plug flow with Peclet numbers exceeding 70.

合成气是平台化学品和燃料（如甲醇、氨和碳氢化合物液体）的原料，通过费托合成。化学循环重整已经发展了几十年，用于生产合成气，包括两个相互连接的容器，在净还原气氛和净氧化气氛之间循环。而不是循环固体，切换气体进料是强制浓度循环的另一种方法。在固定床反应器中，以5 g Ni/NiAl2O4为催化剂，在NiC（还原步骤）和Ni（氧化步骤）之间交替进行反应。4通阀在还原循环中以0.15L/min的速度进料甲烷，在氧化循环中以21%的O2/Ar混合物进料，每个循环持续2 min。甲烷转化率在800℃和0.1 MPa时达到98%，在2 MPa时达到75%。同时，H2和CO的选择性也降低。在所有操作条件下，H2是还原循环的主导产物，CO是氧化循环的主导产物。在6小时的实验过程中，H2和CO的产率保持不变。此外，停留时间分布分析表明反应器运行在塞流中，Peclet数超过70。

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引用次数: 0

Effect of alkali promotion on the catalytic performance of the synergetic K/Fe3O4-Fe5C2/Al2O3 catalyst for CO2 hydrogenation to light paraffins and olefines 碱促进对K/Fe3O4-Fe5C2/Al2O3协同催化剂CO2加氢催化轻质石蜡和烯烃性能的影响

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2025-11-10 DOI: 10.1016/j.cattod.2025.115631

Zixuan Lin, Yasaman Ghaffari, Anik Ashirwadam, Ali Izadbakhsh, David S.A. Simakov

A series of K/α-Fe₂O₃/γ-Al₂O₃ catalysts with high specific surface area (150–300 m²/g) and various levels of alkali promotion (0–11 wt% K) were synthesized using the reverse microemulsion method. The capacity of the catalysts to transform CO₂ into light olefins and paraffins via direct hydrogenation at moderate pressures was examined. The effect of potassium loading was investigated in the 300–500 °C range at 11 bar, evaluating catalytic performance in terms of CO₂ conversion, C2+ selectivity, and space time yield (STY). Reaction tests showed that 7.8 wt% K loading provides the highest CO₂ conversion and C2+ selectivity, of 45 % and 46 %, respectively, with a space time yield of 6.5 mmol g⁻¹ h⁻¹ at 11 bar and 400 °C. The catalyst without alkali promotion provided only 24 % CO₂ conversion, 12 % C2 + selectivity, and a space time yield of 0.87 mmol g⁻¹ h⁻¹. Under reaction conditions α-Fe₂O₃ was converted to a mixture of Fe₃O₄ and χ-Fe₅C₂ nanoparticles that act synergistically to reduce and hydrogenate CO₂. Alkali promotion notably enhanced the formation of χ-Fe₅C₂, leading to higher selectivity to C2 + hydrocarbons.

采用反相微乳液法制备了高比表面积（150 ~ 300 m2/g）和不同碱促进量（0 ~ 11 wt% K）的K/α-Fe2O3/γ-Al2O3系列催化剂。考察了催化剂在中压下直接加氢将CO2转化为轻质烯烃和石蜡的能力。在300-500°C、11 bar的温度范围内考察了钾负载的影响，从CO2转化率、C2+ 选择性和时空产率（STY）三个方面评价了催化性能。反应试验表明，在11 bar和400 °C条件下，7.8 wt%的K负载可获得最高的CO2转化率和C2+ 选择性，分别为45 %和46 %，时空产率为6.5 mmol g−1 h−1。无碱促进催化剂的CO2转化率为24% %，C2 + 选择性为12 %，时空产率为0.87 mmol g−1 h−1。在反应条件下，α-Fe2O3转化为Fe3O4和χ-Fe5C2纳米粒子的混合物，并协同作用还原和氢化CO2。碱促进作用显著增强了χ-Fe5C2的生成，对C2 + 烃有较高的选择性。

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引用次数: 0

Comparison of cobalt complex catalysts having a fourteen-membered ring structure and conventional sixteen-ones for oxygen reduction and hydrogen evolution reactions 十四元环结构钴配合物催化剂与十六元环结构钴配合物催化剂在氧还原和析氢反应中的比较

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2025-11-14 DOI: 10.1016/j.cattod.2025.115635

Zhiqing Feng , Soutaro Honda , Keisuke Awaya , Masato Machida , Makoto Moriya , Yuta Nabae , Junya Ohyama

Developing efficient and durable non-platinum group metal (non-PGM) catalysts is critical for advancing the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) in acidic conditions. Recently, we presented the enhanced performance of carbon supported cobalt complex catalysts with a 14-membered ring hexaazamacrocyclic ligand (Co-14MR/C) catalysts than carbon supported Co phthalocyanine (CoPc/C) catalysts having 16-membered ring (16MR) for the acidic ORR and HER in terms of catalytic activity and durability to propose Co-14MR structures as promising design basis of non-PGM catalyst. In the present study, we extend the comparative analysis to include Co tetraphenylporphyrin (CoTPP), another widely used Co-16MR complex. Although the performance of CoTPP/C catalysts surpasses those of CoPc/C catalysts, Co-14MR/C catalysts show higher activity and durability than CoTPP/C catalysts for both reactions. Therefore, it is indicated that Co-14MR/C catalysts are more effective for the ORR and HER compared to Co-16MR/C catalysts. In addition, based on structural analysis using extended X-ray absorption fine structure (EXAFS) spectroscopy, it is confirmed that the shorter Co-N bond length Co-14MR/C catalysts than Co-16MR/C catalysts is one of the key structural factors to long-term durability. These findings highlight the unique advantages of the 14MR ligand in enhancing both the activity and durability of CoN₄ electrocatalysts.

开发高效、耐用的非铂族金属（non-PGM）催化剂是推进酸性条件下氧还原反应（ORR）和析氢反应（HER）的关键。最近，我们研究了具有14元环六杂环配体的碳负载钴配合物催化剂（Co- 14mr /C）在酸性ORR和HER的催化活性和耐久性方面优于具有16元环（16MR）的碳负载Co-酞菁催化剂（CoPc/C），提出了Co- 14mr结构作为非pgm催化剂的有前途的设计基础。在本研究中，我们将比较分析扩展到Co四苯基卟啉（CoTPP），另一种广泛使用的Co- 16mr配合物。虽然CoTPP/C催化剂的性能优于CoPc/C催化剂，但Co-14MR/C催化剂在这两种反应中都表现出比CoTPP/C催化剂更高的活性和耐久性。因此，与Co-16MR/C催化剂相比，Co-14MR/C催化剂对ORR和HER更有效。此外，基于扩展x射线吸收精细结构（EXAFS）的结构分析，证实了Co-14MR/C催化剂比Co-16MR/C催化剂的Co-N键长度更短是长期耐用的关键结构因素之一。这些发现突出了14MR配体在提高CoN4电催化剂的活性和耐久性方面的独特优势。

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引用次数: 0

Phyto-engineered CuO using Elettaria cardamomum: A visible-light-driven photocatalyst with antibacterial potential for environmental and biomedical applications 小豆蔻植物工程CuO：一种具有环境和生物医学应用抗菌潜力的可见光驱动光催化剂

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2026-01-28 DOI: 10.1016/j.cattod.2026.115697

Harpreet Kaur , Mir Waqas Alam , Mohammed Alsawat , Sanjeev Kumar , Ramandeep Kaur , Manesh A. Yewale , Chandra Kumar , Chinnasamy Sridevi , Gassoumi Bouzid , Mika Sillanpaa

A complete UHPLC-MS phytochemical profiling of Elettaria cardamomum pod extract was conducted, identifying a dominant terpenoid glycoside (m/z 694.185) alongside flavonoid and phenolic acids that collectively mediate reduction, nucleation, and capping in the green synthesis of CuO nanoparticles (EC:CuO NPs). The resulting EC:CuO NPs exhibited a monoclinic structure with Cu²⁺ oxidation state, diverse morphologies (35–600 nm), and high purity (Cu 74.99 wt%, O 25.01 wt%), as confirmed by XRD, XPS, FESEM/EDS. Significant Methyl Orange (MO) adsorption was observed after optimizing reaction parameters, while ROS-scavenger studies identified photogenerated holes (h⁺) as the dominant oxidative species, followed by •OH and O₂⁻• radicals. Under simulated solar irradiation (1 sun), EC:CuO NPs achieved 99 % MO degradation within 90 min, with a quantum yield of 1.60 × 10⁻⁴ molecules photon⁻¹ , a space-time yield of 7.98 × 10⁻⁶ molecules photon⁻¹ mg⁻¹ , and a rate constant (k) of 0.07332 min⁻¹ . The catalyst retained over 92 % efficiency after four reuse cycles. Agar-well assays demonstrated potent antibacterial activity with inhibition zones of 2.8 cm and 2.6 cm against S. aureus and P. aeruginosa, respectively, attributed by Cu²⁺-ion release and ROS-mediated membrane disruption. These findings establish EC:CuO NPs as a comprehensively characterized, dual-function material for sustainable dye mineralization and broad-spectrum antimicrobial applications.

对豆蔻豆荚提取物进行了全面的UHPLC-MS植物化学分析，鉴定出主要萜类苷（m/z 694.185）与类黄酮和酚酸共同介导CuO纳米颗粒（EC:CuO NPs）的绿色合成过程中的还原、成核和盖层。经XRD、XPS、FESEM/EDS证实，所得EC:CuO NPs具有单斜结构，Cu 2 +氧化态，形貌多样（35-600 nm），纯度高（Cu 74.99 wt%, O 25.01 wt%）。优化反应参数后观察到明显的甲基橙（MO）吸附，而ros -清除剂研究发现光生孔（h +）是主要的氧化物质，其次是•OH和O₂⁻-自由基。太阳在模拟太阳辐射(1),EC:措NPs莫退化90 分钟内达到99%,量子产率为1.60 ×10 ⁻⁴分子光子⁻¹ ,时空产生7.98 ×10 ⁻⁶分子光子⁻¹ mg⁻¹ ,速率常数(k)的0.07332 分钟⁻¹ 。经过四次重复使用，催化剂的效率保持在92%以上。琼脂井实验表明，Cu 2 +对金黄色葡萄球菌和铜绿假单胞菌的抑制区分别为2.8 cm和2.6 cm，这是由于Cu 2 +离子释放和ros介导的膜破坏所致。这些发现表明EC:CuO NPs是一种全面表征的双功能材料，具有可持续染料矿化和广谱抗菌应用。

{"title":"Phyto-engineered CuO using Elettaria cardamomum: A visible-light-driven photocatalyst with antibacterial potential for environmental and biomedical applications","authors":"Harpreet Kaur , Mir Waqas Alam , Mohammed Alsawat , Sanjeev Kumar , Ramandeep Kaur , Manesh A. Yewale , Chandra Kumar , Chinnasamy Sridevi , Gassoumi Bouzid , Mika Sillanpaa","doi":"10.1016/j.cattod.2026.115697","DOIUrl":"10.1016/j.cattod.2026.115697","url":null,"abstract":"<div><div>A complete UHPLC-MS phytochemical profiling of <em>Elettaria cardamomum</em> pod extract was conducted, identifying a dominant terpenoid glycoside (<em>m/z</em> 694.185) alongside flavonoid and phenolic acids that collectively mediate reduction, nucleation, and capping in the green synthesis of CuO nanoparticles (<em>EC</em>:CuO NPs). The resulting <em>EC</em>:CuO NPs exhibited a monoclinic structure with Cu²⁺ oxidation state, diverse morphologies (35–600 nm), and high purity (Cu 74.99 wt%, O 25.01 wt%), as confirmed by XRD, XPS, FESEM/EDS. Significant Methyl Orange (MO) adsorption was observed after optimizing reaction parameters, while ROS-scavenger studies identified photogenerated holes (h⁺) as the dominant oxidative species, followed by •OH and O₂⁻• radicals. Under simulated solar irradiation (1 sun), <em>EC</em>:CuO NPs achieved 99 % MO degradation within 90 min, with a quantum yield of 1.60 × 10⁻⁴ molecules photon⁻¹ , a space-time yield of 7.98 × 10⁻⁶ molecules photon⁻¹ mg⁻¹ , and a rate constant (k) of 0.07332 min⁻¹ . The catalyst retained over 92 % efficiency after four reuse cycles. Agar-well assays demonstrated potent antibacterial activity with inhibition zones of 2.8 cm and 2.6 cm against <em>S. aureus</em> and <em>P. aeruginosa</em>, respectively, attributed by Cu²⁺-ion release and ROS-mediated membrane disruption. These findings establish <em>EC</em>:CuO NPs as a comprehensively characterized, dual-function material for sustainable dye mineralization and broad-spectrum antimicrobial applications.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"467 ","pages":"Article 115697"},"PeriodicalIF":5.3,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Dual response of various TiO2 specimens for the solar photocatalytic inactivation of Escherichia coli and degradation of humic matter 不同TiO2样品对太阳光催化大肠杆菌失活和腐殖质降解的双重响应

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2025-11-19 DOI: 10.1016/j.cattod.2025.115636

Ceyda S. Uyguner-Demirel, Ezgi Lale, Miray Bekbolet

Solar photocatalysis is regarded as a plausible approach for degradation of micropollutants, natural organic matter and a variety of microorganisms in water. As a used photocatalyst, several modification methodologies i.e., Fe^3 + doping of TiO₂ are required to extend the light harvesting range to visible region. This study was conducted to investigate the role of bare (P-25), synthesized TiO₂ (SynTiO₂) and their respective Fe doped specimens on simultaneous degradation of organic matrix and inactivation of Escherichia coli (E. coli) in humic acid (HA) solution consisting of major cations/anions representing natural water matrix (WM). Inactivation efficiency modelled by first order kinetics revealed an order as “high dose (hd) Fe-bare specimens-low dose (ld) Fe” in HAWM solution. On the other hand, solar photocatalytic inactivation kinetics of E. coli in HA followed the order of effectiveness as; ldFe-SynTiO₂≈SynTiO₂>hdFe-SynTiO₂>hdFe-TiO₂>ldFe-TiO₂>TiO₂. The selectivity of TiO₂ towards organics was evident in both HA solution and HAWM solution. Following photocatalytic inactivation, release of intracellular organic matter was followed by specific UV–vis and fluorescence spectroscopic parameters. Bare TiO₂ was more effective in removal of all specific UV–vis parameters in comparison to SynTiO₂. Fe dose dependency could be related to the HAWM components displaying a discriminating effect in between TiO₂ and SynTiO₂. UV–vis and fluorescence spectroscopic parameters were evaluated in accordance with total K, carbohydrate and protein contents. The results demonstrated that solar photocatalysis using Fe doped TiO₂ specimens could well serve as an alternative method for disinfection purposes.

太阳能光催化被认为是一种降解水中微污染物、天然有机物和多种微生物的可行方法。作为一种常用的光催化剂，需要几种修饰方法，如Fe3 +掺杂TiO2，将光捕获范围扩展到可见光区域。本研究研究了裸（P-25）、合成TiO2 （SynTiO2）及其各自的Fe掺杂样品在以天然水基质（WM）为代表的主要阳离子/阴离子组成的腐殖酸（HA）溶液中对有机基质的同时降解和大肠杆菌（E. coli）失活的作用。一级动力学模型表明，在HAWM溶液中，裸铁样品的失活效率为“高剂量（hd） Fe-低剂量（ld） Fe”。另一方面，大肠杆菌在HA中的太阳光催化失活动力学的有效性顺序为；ldFe-SynTiO2≈SynTiO2> hdFe-SynTiO2> hdFe-TiO2> ldFe-TiO2>二氧化钛。TiO2在HA溶液和HAWM溶液中对有机物的选择性都很明显。光催化失活后，通过特定的紫外-可见和荧光光谱参数跟踪细胞内有机物的释放。与SynTiO2相比，裸TiO2更有效地去除所有特定的UV-vis参数。Fe的剂量依赖性可能与HAWM组分在TiO2和SynTiO2之间表现出区分作用有关。根据总钾、碳水化合物和蛋白质含量评估紫外-可见和荧光光谱参数。结果表明，利用Fe掺杂TiO2样品进行太阳能光催化可以作为一种替代的消毒方法。

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引用次数: 0

Hydrothermal synthesis of BiOX/Bi2WO6/Bi2S3 ternary heterostructures for enhanced solar light photocatalytic degradation of ciprofloxacin in aquatic media 水热合成bix /Bi2WO6/Bi2S3三元异质结构增强太阳光催化降解环丙沙星的水生介质

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2026-01-27 DOI: 10.1016/j.cattod.2026.115693

Muhammad Naeem , Muhammad Imran , Shoomaila Latif , Adnan Ashraf , Mohammad Mahbubul Hassan , Muhammad Naeem Khan

The presence of trace levels of antibiotics in drinking water poses a serious concern as it contributes to the development of antibiotic resistance in bacteria. In this study, various bismuth-based ternary heterostructure photocatalysts were synthesized by combining BiOX/Bi₂WO₆ (where X = Cl, Br, or I) heterostructures with Bi₂S₃ at a molar ratio of 1:1:1. The X-ray deffraction (XRD) and scanning electron microscopy (SEM) analyses confirmed the successful synthesis of BiOX/Bi₂WO₆/Bi₂S₃ ternary heterostructures with tunable band gaps, while the photoluminescence (PL) spectroscopy indicated enhanced charge separation. The photocatalytic performance of these ternary heterostructures was evaluated by degrading ciprofloxacin (CFX) in an aqueous solution under solar light. All the ternary heterostructures, namely BiOCl/Bi₂S₃/Bi₂WO₆ (BWS-Cl), BiOBr/Bi₂S₃/Bi₂WO₆ (BWS-Br), and BiOI/Bi₂S₃/Bi₂WO₆ (BWS-I), demonstrated excellent photodegradation of CFX within 120 min. The degradation rate constant (k) for CFX using the BWS-Cl heterostructure was 0.023 min⁻¹ . The effect of catalyst dosage, CFX concentration, and the initial pH of the drug solution on the photocatalytic degradation performance of CFX was also examined. Notably, the BWS-Cl exhibited the highest degradation efficiency at 96.6 %, achieved under sunlight with an optimized catalyst dosage of 0.6 g/L and an initial ciprofloxacin concentration of 5 ppm at a pH of 9.00. Based on the results from radical trapping experiments and PL analysis, a potential degradation mechanism for CFX by these heterostructures was proposed. The stable and reusable ternary heterostructure photocatalysts developed in this work may find applications in the removal of CFX and other similar emerging organic pollutants from potable water.

饮用水中微量抗生素的存在引起了严重的关注，因为它有助于细菌对抗生素产生耐药性。在本研究中，以Bi2S3和bix /Bi2WO6（其中X = Cl, Br, or I）异质结构以1:1:1的摩尔比组合，合成了多种铋基三元异质结构光催化剂。x射线衍射（XRD）和扫描电镜（SEM）分析证实成功合成了带隙可调的bix /Bi2WO6/Bi2S3三元异质结构，而光致发光（PL）光谱显示电荷分离增强。通过在日光下降解环丙沙星（CFX），评价了这些三元异质结构的光催化性能。所有三元异质结构BiOCl/Bi2S3/Bi2WO6 （BWS-Cl）、BiOBr/Bi2S3/Bi2WO6 （BWS-Br）和bii /Bi2S3/Bi2WO6 （BWS-I）在120 min内均表现出良好的光降解CFX性能。BWS-Cl异质结构对CFX的降解速率常数(k)为0.023 min⁻¹ 。考察了催化剂用量、CFX浓度和药物溶液初始pH对CFX光催化降解性能的影响。当催化剂用量为0.6 g/L，初始环丙沙星浓度为5 ppm， pH值为9.00时，BWS-Cl在阳光下的降解效率最高，达到96.6% %。基于自由基捕获实验和PL分析的结果，提出了这些异质结构对CFX的潜在降解机制。本研究开发的稳定且可重复使用的三元异质结构光催化剂可用于去除饮用水中的CFX和其他类似的新兴有机污染物。

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引用次数: 0

Investigate biodiesel products using heterogeneous catalysts in variations lauric acid feedstock through elemental analysis and emissions testing using diesel engines 通过元素分析和柴油发动机排放测试，研究在不同月桂酸原料中使用多相催化剂的生物柴油产品

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.cattod.2026.115686

Anggara Dwita Burmana , Renita Manurung , Iriany , Taslim

Biodiesel, a sustainable alternative to fossil fuels, was produced using lauric acid derived from palm kernel and coconut oils and Amberlite HPR 1100 Na as a catalyst. The esterification process was conducted with varying catalyst concentrations (5 % to 20 %), molar ratio (5:1–8:1) and temperatures (65 °C to 80 °C), achieving optimal conversion rates of 93.5 % and 92.7 % for palm kernel and coconut oils, respectively, at 20 % catalyst concentration and 65 °C. The reusability of the catalyst showed promising results, maintaining high efficiency over seven cycles for palm kernel oil and six for coconut oil. Analytical techniques, including gas chromatography with flame ionization detection (GC-FID), scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), pyridine FTIR, brunauer-emmett-teller (BET) and elemental analysis confirmed the structural and compositional integrity of the catalyst and biodiesel produced. The results of the emissions analysis of biodiesel products, including CO, CO₂, NO_x, SO_x, hydrocarbons, and smoke opacity, as well as comparisons with petroleum diesel, are presented. This study aims to highlight the potential of Amberlite HPR 1100 Na in increasing the yield and sustainability of biodiesel by enabling its efficient reuse. Additionally, this study will examine the extent to which this biodiesel product generates emissions.

生物柴油是一种可持续的化石燃料替代品，它是用从棕榈仁和椰子油中提取的月桂酸和Amberlite HPR 1100 Na作为催化剂生产的。在不同的催化剂浓度（5 % ~ 20 %）、摩尔比（5:1 ~ 8:1）和温度（65 °C ~ 80 °C）条件下进行酯化反应，在催化剂浓度20 %和65 °C条件下，棕榈仁油和椰子油的最佳转化率分别为93.5 %和92.7 %。催化剂的可重复利用性显示出良好的效果，对棕榈仁油和椰子油分别在7次和6次循环中保持了较高的效率。分析技术，包括气相色谱火焰电离检测（GC-FID），扫描电镜（SEM），傅里叶变换红外光谱（FTIR），吡喃FTIR，布鲁诺尔-埃米特-泰勒（BET）和元素分析证实了催化剂和生物柴油的结构和组成的完整性。介绍了生物柴油产品的排放分析结果，包括CO、CO2、NOx、SOx、碳氢化合物和烟雾透明度，并与石油柴油进行了比较。本研究旨在强调Amberlite HPR 1100 Na在提高生物柴油产量和可持续性方面的潜力，使其能够有效地重复使用。此外，本研究将检查这种生物柴油产品产生排放的程度。

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引用次数: 0

Direct production of propylene glycol from propylene using bifunctional Al-TS-1 用双功能Al-TS-1从丙烯直接生产丙二醇

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2025-11-13 DOI: 10.1016/j.cattod.2025.115634

Kwang Hyun Kim, Haneul Kim, Ja Hun Kwak

Propylene glycol (PG) is an important industrial chemical used in pharmaceuticals, cosmetics, and antifreeze. The conventional industrial process for producing PG involves a two-step procedure: the epoxidation of propylene (PP), followed by the hydrolysis of propylene oxide (PO) into PG. However, this process involves multiple separation and purification steps that are economically and energetically inefficient. Herein, we present a bifunctional Al-TS-1 catalyst for the direct synthesis of PG from PP using H₂O₂ as an oxidant under mild conditions. The catalyst features two active centers of isomorphic substituted monomeric titanium in a zeolite framework for PP epoxidation as well as Brønsted acidic aluminum sites for PO hydrolysis. Al-TS-1 efficiently facilitates epoxidation and hydrolysis with over 95 % PG selectivity from PP, higher than that of physically mixed TS-1 and ZSM-5 catalysts. However, its activity is relatively low owing to pore blocking by the produced PG. To overcome this low activity, we optimized the reaction media to acetone/H₂O, which enhanced PG dissolution from zeolite pores and increased the accessibility of propylene to the active centers in the zeolite pores. As a result, over 99 % catalytic overall activity and over 98 % PG selectivity was achieved using Al-TS-1. The direct PG production from the PP system using a bifunctional Al-TS-1 catalyst successfully demonstrates high PG selectivity and broadens its potential for efficient PG production.

丙二醇（PG）是一种重要的工业化学品，用于制药、化妆品和防冻剂。生产PG的传统工业过程包括两个步骤：丙烯（PP）的环氧化，然后是环氧丙烷（PO）的水解成PG。然而，该过程涉及多个分离和纯化步骤，在经济和能量上都效率低下。在此，我们提出了一种双功能Al-TS-1催化剂，用于在温和条件下以H2O2为氧化剂直接从PP合成PG。该催化剂的两个活性中心为沸石框架内的同形取代单体钛，用于PP环氧化；两个活性中心为Brønsted酸性铝，用于PO水解。Al-TS-1能有效促进PP的环氧化和水解，对PG的选择性超过95% %，高于物理混合的TS-1和ZSM-5催化剂。为了克服活性较低的问题，我们将反应介质优化为丙酮/水，促进了PG从沸石孔中的溶解，提高了丙烯对沸石孔中活性中心的可及性。结果表明，Al-TS-1的总催化活性达到99% %以上，PG选择性达到98% %以上。使用双功能Al-TS-1催化剂从PP系统直接生产PG成功地展示了高PG选择性，并扩大了其高效生产PG的潜力。

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引用次数: 0

Construction of a Z-Scheme MIL-125@PCN-224 MOF-on-MOF heterojunction for efficient visible-light photodegradation of methylene blue Z-Scheme MIL-125@PCN-224 MOF-on-MOF异质结在可见光下对亚甲基蓝的高效降解

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.cattod.2026.115694

Yan-Qin Guo, Zhou Xu, Li Wen, Yun-Hui Cheng, Mao-Long Chen

The titanium-based metal–organic framework MIL-125(Ti), with a wide bandgap of 3.20 eV, suffers from poor visible-light utilization and rapid charge recombination. To overcome this limitation, a Z-scheme MOF-on-MOF heterojunction was constructed by integrating narrow-bandgap PCN-224 (1.70 eV) with MIL-125 using polyvinylpyrrolidone as a surfactant mediator. The formation of the heterojunction successfully reduced the optical bandgap to 2.23 eV, quantitatively confirming the extended visible-light harvesting. The resulting MIL-125@PCN-224 composite displayed outstanding photocatalytic activity toward methylene blue (MB) degradation. Under visible-light irradiation, it achieved 91.17 % MB (30 mg/L) removal within one hour, with a kinetic rate constant k_app of 0.0233 min⁻¹, which is 3.99 times higher than that of MIL-125. This enhanced performance is ascribed to the direct Z-scheme charge-transfer pathway. Band structure analysis provides quantitative support: the conduction band potentials of MIL-125 and PCN-224 were determined to be −0.63 V and −0.74 V vs. NHE, respectively. This configuration facilitates efficient charge separation while maintaining strong redox power, allowing electrons in PCN-224 to reduce O₂ to generate superoxide anions (·O₂⁻), consistent with the radical trapping and ESR identification of superoxide anions (·O₂⁻) and singlet oxygen (¹O₂) as the dominant reactive species. Furthermore, composite exhibited excellent stability over a wide pH range and maintained high efficiency in real water matrices. These results demonstrate that heterojunction construction is an effective strategy for enhancing photocatalytic efficiency.

钛基金属-有机骨架MIL-125（Ti）具有3.20 eV的宽带隙，可见光利用率差，电荷复合速度快。为了克服这一限制，采用聚乙烯吡咯烷酮作为表面活性剂介质，将窄带隙PCN-224（1.70 eV）与MIL-125进行积分，构建了Z-scheme MOF-on-MOF异质结。异质结的形成成功地将光学带隙减小到2.23 eV，定量地证实了可见光收获的延长。所得MIL-125@PCN-224复合材料对亚甲基蓝（MB）的降解表现出优异的光催化活性。在可见光照射下，1 h内对MB（30 mg/L）的去除率为91.17 %，动力学速率常数kapp为0.0233 min−1，是MIL-125的3.99倍。这种增强的性能归因于直接的Z-scheme电荷转移途径。带结构分析提供了定量支持：MIL-125和PCN-224的传导带电位相对于NHE分别为- 0.63 V和- 0.74 V。这种结构有利于有效的电荷分离，同时保持强大的氧化还原能力，允许PCN-224中的电子还原O2生成超氧阴离子（·O2−），这与超氧阴离子（·O2−）和单线态氧（1O2）作为优势反应物质的自由基捕获和ESR识别一致。此外，复合材料在较宽的pH范围内表现出优异的稳定性，并在实际水基质中保持高效率。这些结果表明异质结的构建是提高光催化效率的有效策略。

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引用次数: 0