Reaction Kinetics, Mechanisms and Catalysis最新文献_第10页

Fabrication and evaluation of ZnO–Ag nanocomposites exhibiting enhanced antibacterial properties and their potential applications 具有增强抗菌性能的氧化锌-银纳米复合材料的制备和评估及其潜在应用

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-08-01 DOI: 10.1007/s11144-024-02699-7

Alisha Verma, Nitesh Kumar, Rinki Agarwal, Sonal Chauhan, V. K. Jain, Sucheta Sengupta

引用次数: 0

Optimization of concentrations of natural antioxidants (curcumin) to enhance the thermal stability of ultra high molecular weight polyethylene (UHMWPE) 优化天然抗氧化剂（姜黄素）的浓度，提高超高分子量聚乙烯（UHMWPE）的热稳定性

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-31 DOI: 10.1007/s11144-024-02697-9

Nidhi Khattar, Jagriti, Shagun Kainth, Piyush Sharma, Vishal Ahlawat, Urmila Berar, Pawan K. Diwan

{"title":"Optimization of concentrations of natural antioxidants (curcumin) to enhance the thermal stability of ultra high molecular weight polyethylene (UHMWPE)","authors":"Nidhi Khattar,  Jagriti, Shagun Kainth, Piyush Sharma, Vishal Ahlawat, Urmila Berar, Pawan K. Diwan","doi":"10.1007/s11144-024-02697-9","DOIUrl":"10.1007/s11144-024-02697-9","url":null,"abstract":"<div><p>The impact of different concentrations of natural antioxidants (curcumin) on the thermal stability of UHMWPE (ultra-high molecular weight polyethylene) is examined via the thermogravimetric (TGA/DTA) technique, in the temperature region 50–600 °C at a 5 °C/min heating rate. This work employs the model fitting (Coats and Redfern) approach to determine the optimal curcumin concentration. UHMWPE samples at optimum concentration are further subjected to three other heating rates, viz., 10, 15 and 20 °C. A bi-Gaussian asymmetric function is utilized for deconvolution to elucidate the complexities of thermal decomposition. Through deconvolution, two peaks are obtained and the activation energy corresponding to each peak is determined through two iso-conversional kinetic (Friedman and Starink) models. By utilizing activation energy, the random nucleation reaction mechanism involved in thermal decomposition is recognized. Finally, changes in entropy <span>(left(Delta Sright))</span>, enthalpy <span>(left(Delta Hright))</span> and Gibbs free energy <span>(left(Delta Gright))</span> are determined.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"137 6","pages":"3069 - 3083"},"PeriodicalIF":1.7,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Model-free kinetic analysis of multi-step thermal decomposition of ammonium perchlorate coated with reduced graphene oxide 包覆还原氧化石墨烯的高氯酸铵多步热分解的无模型动力学分析

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-30 DOI: 10.1007/s11144-024-02683-1

Hamdane Akbi, Souleymen Rafai, Ahmed Mekki, Slimane Bekhouche, Sabri Touidjine, Elamine Louafi, Ahmed Saim, Mohamed Abderrahim Hamouche

{"title":"Model-free kinetic analysis of multi-step thermal decomposition of ammonium perchlorate coated with reduced graphene oxide","authors":"Hamdane Akbi, Souleymen Rafai, Ahmed Mekki, Slimane Bekhouche, Sabri Touidjine, Elamine Louafi, Ahmed Saim, Mohamed Abderrahim Hamouche","doi":"10.1007/s11144-024-02683-1","DOIUrl":"10.1007/s11144-024-02683-1","url":null,"abstract":"<div><p>This study investigates the effect of coating AP with RGO on its thermal decomposition kinetics and behavior. Differential scanning calorimetry (DSC) was performed for pure AP and AP@RGO at several heating rates. DSC curves of AP@RGO for various heating rates were split into individual reactions using a mathematical deconvolution approach. The assessment of kinetic triplets of various reactions was accomplished for both AP and AP@RGO using an effective model-free approach (MFA). Deconvolution of the DSC curve for AP@RGO reveals three distinct decomposition processes, compared to only two observed in pure AP. Notably, the low-temperature decomposition reaction appears to be catalyzed by RGO, leading to a dramatic decrease in activation energy from 164 to 116 kJ/g. Conversely, the high-temperature decomposition remains uncatalyzed, with a slight increase in activation energy from 177 to 188 kJ/g. The catalytic effectiveness of RGO in the thermal decomposition process of AP fluctuates due to structural transformations within RGO and its degradation in the presence of perchloric acid.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"125 - 142"},"PeriodicalIF":1.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Metallic silver modified SnO2–Zn2SnO4 cube nanomaterials for improved photocatalytic degradation of rhodamine B 改进罗丹明 B 光催化降解的金属银修饰 SnO2-Zn2SnO4 立方体纳米材料

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-30 DOI: 10.1007/s11144-024-02682-2

Shuyun Huang, Huanhuan Xu, Yue Ouyang, Yun Zhou, Junwei Xu, Jianjun Liu

{"title":"Metallic silver modified SnO2–Zn2SnO4 cube nanomaterials for improved photocatalytic degradation of rhodamine B","authors":"Shuyun Huang, Huanhuan Xu, Yue Ouyang, Yun Zhou, Junwei Xu, Jianjun Liu","doi":"10.1007/s11144-024-02682-2","DOIUrl":"10.1007/s11144-024-02682-2","url":null,"abstract":"<div><p>To modify the wide bandgap and intrinsic high recombination rate of photogenerated charge carriers of Zn<sub>2</sub>SnO<sub>4</sub> photocatalysts, Ag/SnO<sub>2</sub>–Zn<sub>2</sub>SnO<sub>4</sub> composites were prepared by depositing Ag nanoparticles onto cube-shaped SnO<sub>2</sub>–Zn<sub>2</sub>SnO<sub>4</sub> nanomaterials via photoreduction. The composites were characterized by XRD, SEM, EDS, TEM, XPS, and UV–Vis DRS, and their photocatalytic degradation effect on rhodamine B (Rh B) for different Ag loadings was studied, with 10%Ag/SnO<sub>2</sub>–Zn<sub>2</sub>SnO<sub>4</sub> showing the greatest effect. The UV photocatalytic degradation rate of the Rh B solution reaches 100% after 12 min of visible light irradiation and 91% after five cycles. The free radical trapping agent experiment indicated that the active substances of Ag/SnO<sub>2</sub>–Zn<sub>2</sub>SnO<sub>4</sub> photocatalysis are ·O<sub>2</sub><sup>−</sup> and h<sup>+</sup>. Further, photoelectrochemical tests revealed the higher electron–hole separation efficiency and faster charge transfer rate of the composites, enhancing the formation of photoproduced carriers and photocatalytic activity.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"519 - 532"},"PeriodicalIF":1.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 methyl orange removal in aqueous solutions using bio-catalytic metal oxides derived from pomegranate peel waste: a green chemistry evaluation 利用从石榴皮废料中提取的生物催化金属氧化物提高水溶液中甲基橙的去除率：绿色化学评估

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-30 DOI: 10.1007/s11144-024-02685-z

Harez Rashid Ahmed, Mohammed Ali Salih, Nian N. M. Agha, Diary Ibrahim Tofiq, Mozart A. H. Karim, Kawan F. Kayani, Anu Mary Ealias, Rebaz F. Hamarawf, Bakhtyar K. Aziz, Lanya Omer Khatab

{"title":"Enhanced methyl orange removal in aqueous solutions using bio-catalytic metal oxides derived from pomegranate peel waste: a green chemistry evaluation","authors":"Harez Rashid Ahmed, Mohammed Ali Salih, Nian N. M. Agha, Diary Ibrahim Tofiq, Mozart A. H. Karim, Kawan F. Kayani, Anu Mary Ealias, Rebaz F. Hamarawf, Bakhtyar K. Aziz, Lanya Omer Khatab","doi":"10.1007/s11144-024-02685-z","DOIUrl":"10.1007/s11144-024-02685-z","url":null,"abstract":"<div><p>This study investigates the potential of pomegranate peel (PP) as a raw material for synthesizing a novel biocatalyst metal oxide (BCMO) aimed at the efficient removal of methyl orange (MO) dye from aqueous solutions. The adsorption capacities of both PP and BCMO were systematically evaluated. PP was subjected to inorganic salt treatment and calcination to enhance its adsorption capacity and increase attractive forces at the nanoparticle level. The surface characteristics of the biocatalyst were thoroughly examined using FTIR, SEM, BET analysis, and EDX spectroscopy, revealing the development of a crystalline structure following treatment with Mg(NO<sub>3</sub>)<sub>2</sub>⋅6H<sub>2</sub>O, along with observable changes in surface morphology and elemental composition. Under standard conditions, BCMO demonstrated a significant increase in efficiency, achieving 99.80% removal for 100 mg/L of methyl orange, compared to 44% for untreated PP at 50 mg/L. Kinetic analysis indicated a transition from pseudo-first-order to pseudo-second-order, signifying a shift from physical to chemical adsorption. This transition resulted in a substantial reduction in equilibrium time and a significant increase in maximum adsorption capacity from 17.3637 to 176.686 mg/g. Furthermore, the catalytic efficiency of BCMO was assessed over seven cycles, showing only a minor 5% reduction in efficiency, indicating its potential for practical applications. The environmental sustainability of the road was assessed using the AGREE and BAGI indicators, both of which are considered exemplary measures of environmental friendliness.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"137 6","pages":"3417 - 3440"},"PeriodicalIF":1.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Mesoporous BiCl3 immobilized silicic acid as a stabilized Lewis acid catalyst for the selective synthesis of 4-nitro-o-xylene from the nitration of o-xylene with NO2 under mild conditions 介孔固定化 BiCl3 硅酸作为稳定的路易斯酸催化剂，用于在温和条件下从邻二甲苯与二氧化氮的硝化反应中选择性合成 4-硝基邻二甲苯

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-30 DOI: 10.1007/s11144-024-02698-8

Jiaqi Yan, Weiwen Fu, Kuiyi You, Fangfang Zhao, He’an Luo

{"title":"Mesoporous BiCl3 immobilized silicic acid as a stabilized Lewis acid catalyst for the selective synthesis of 4-nitro-o-xylene from the nitration of o-xylene with NO2 under mild conditions","authors":"Jiaqi Yan, Weiwen Fu, Kuiyi You, Fangfang Zhao, He’an Luo","doi":"10.1007/s11144-024-02698-8","DOIUrl":"10.1007/s11144-024-02698-8","url":null,"abstract":"<div><p>A solvent-free, acid-free, and efficient strategy was developed for the selective preparation of 4-nitro-o-xylene (4-NOX) from the catalytic nitration of o-xylene with NO<sub>2</sub> mediated O<sub>2</sub> over BiCl<sub>3</sub> immobilized silicic acid catalyst (BiCl<sub>3</sub>-SA). The results indicated that the Lewis acid BiCl<sub>3</sub>-SA conjoined NO<sub>2</sub>–O<sub>2</sub> as a composite system synergistically promotes o-xylene conversion and 4-NOX selectivity. Under optimal conditions, 52.4% of o-xylene conversion with 68.4% 4-NOX selectivity was obtained at 35 °C. The characterization demonstrated that the highly dispersed metal Bi species form stable chemical bonds with the SA surface, which can effectively inhibit the loss of metal species and generate abundant acid sites. The developed catalyst is not only inexpensive but also has excellent stability and catalytic performance. Furthermore, a plausible mechanism for the catalytic nitration of o-xylene using NO<sub>2</sub> as a nitration agent over BiCl<sub>3</sub>-SA was proposed. This work provides an eco-friendly and practical protocol for improving desirable 4-NOX selectivity and reducing the discharge of acidic wastewater, with potential application prospects.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"137 6","pages":"3157 - 3173"},"PeriodicalIF":1.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Optimizing methanesulfonic acid leaching for efficient extraction of magnesia from a Nigerian antigorite-rich dolomite ore 优化甲磺酸浸出法，从尼日利亚富含锑的白云石矿中高效提取氧化镁

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-24 DOI: 10.1007/s11144-024-02693-z

Ayo F. Balogun, Alafara A. Baba

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Optical, dielectric and photoelectrochemical performances of the CeO2/silicon nanowire system: Studying the silicon nanowire length effect on the photodegradation of rhodamine B 二氧化铈/硅纳米线系统的光学、介电和光电化学性能：研究硅纳米线长度对罗丹明 B 光降解的影响

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-20 DOI: 10.1007/s11144-024-02684-0

K. Derkaoui, T. Hadjersi, K. Boukhouidem, A. M. Djaballah, C. Belabed, S. Friha, S. Naama, M. Kechouane, M. Trari

{"title":"Optical, dielectric and photoelectrochemical performances of the CeO2/silicon nanowire system: Studying the silicon nanowire length effect on the photodegradation of rhodamine B","authors":"K. Derkaoui, T. Hadjersi, K. Boukhouidem, A. M. Djaballah, C. Belabed, S. Friha, S. Naama, M. Kechouane, M. Trari","doi":"10.1007/s11144-024-02684-0","DOIUrl":"10.1007/s11144-024-02684-0","url":null,"abstract":"<div><p>In this study, we explore the advanced optical and dielectric properties of cerium dioxide nanoparticles combined with silicon nanowire (CeO<sub>2</sub>NP/SiNW) composites. Utilizing diffuse reflectance spectra (R(λ)), we extracted key parameters such as the extinction coefficient (k), refractive index (n), electrical conductivity (σ<sub>elc</sub>), optical conductivity (σ<sub>opt</sub>), and dissipation factor (tan δ) within the spectral range of 330–2000 nm. Capacitance measurements revealed a p-type conduction mechanism with a flat band potential (E<sub>fb</sub>) of − 0.02 V. X-ray diffraction (XRD) analysis confirmed the cubic phase of the CeO<sub>2</sub>NPs, while photoluminescence (PL) studies exhibited a broad emission peak at approximately 680 nm. The morphology of the CeO<sub>2</sub>NP/SiNW composites was meticulously analyzed using scanning electron microscopy (SEM), focusing on variations due to different SiNW etching times. Critically, the impact of SiNW length on the photodegradation efficiency of Rhodamine B was evaluated, demonstrating a remarkable 100% degradation rate for nanowires with a length of 31.52 µm. This work underscores the importance of comprehensively studying the optical, dielectric, and photoelectrochemical properties to optimize the degradation of Rhodamine B.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"138 1","pages":"499 - 518"},"PeriodicalIF":1.7,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Theoretical screening of double-atom metals anchored on defective boron nitride for N2 reduction 锚定在缺陷氮化硼上的双原子金属用于还原 N2 的理论筛选

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-19 DOI: 10.1007/s11144-024-02691-1

Xin Lian, Xinlin Tang, Haiyue Liao, Wenlong Guo, Yunhuai Zhang, Guangyong Gao

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Chromium and nickel exclusion from contaminated water by biomass based carbon microsheet 利用基于生物质的碳微片排除受污染水中的铬和镍

IF 1.7 4区化学

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2024-07-18 DOI: 10.1007/s11144-024-02688-w

Madhur Kant, Mousumi Sen, Fehmeeda Khatoon

{"title":"Chromium and nickel exclusion from contaminated water by biomass based carbon microsheet","authors":"Madhur Kant, Mousumi Sen, Fehmeeda Khatoon","doi":"10.1007/s11144-024-02688-w","DOIUrl":"10.1007/s11144-024-02688-w","url":null,"abstract":"<div><p>In the present investigation, biomass-based carbon microsheets were synthesized using melamine and corn cob powder as carbon precursors. Three adsorbents were prepared: Carbon microsheets 500 (CMS-500), biomass-based carbon microsheets (BCMS-500), and BCMS-F-500, which were characterized using different analytical techniques. Synthesized adsorbents were optimized for simultaneous adsorption of Ni(II) and Cr(VI) from an aqueous solution. Adsorption was optimized by varying the values of operating parameters, including reaction pH, adsorbent and adsorbate concentration, temperature, and contact time. Maximum adsorption of Cr(VI) was achieved at pH 2 and of Ni(II) was achieved at pH 6 using a 0.5 g/L adsorbent dose and 20 mg/L for each metal concentration. The adsorption of metal ions increased with increasing temperature. The Langmuir adsorption isotherm model best fitted the adsorption of Cr(VI) with both adsorbent and Ni(II) by CMS-500. While the Freundlich adsorption isotherm models were best suited for the adsorption of Ni(II) by BCMS-500, To understand the adsorbent properties, the adsorbent was characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) combined with energy dispersive spectroscopy (EDS), and an X-ray diffractometer (XRD). CMS-500 and BCMS-500 were found to be highly effective adsorbents that can be applied for the effective management of Cr(VI) and Ni(II)-contaminated wastewater.</p></div>","PeriodicalId":750,"journal":{"name":"Reaction Kinetics, Mechanisms and Catalysis","volume":"137 6","pages":"3005 - 3024"},"PeriodicalIF":1.7,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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