Pub Date : 2019-03-31DOI: 10.2174/2211544708666190124114519
Aneeya K. Samantara, D. Dash, Diptimoyee Bhuyan, Namita Dalai, Bijayalaxmi Jena
In this article, we explored the possibility of controlling the reactivity of ZnO nanostructures by modifying its surface with gold nanoparticles (Au NPs). By varying the concentration of Au with different wt% (x = 0.01, 0.05, 0.08, 1 and 2), we have synthesized a series of (ZnO/Aux) nanocomposites (NCs). A thorough investigation of the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface has been carried out. It was observed that ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity among all concentrations of Au on the ZnO surface, which degrades the dye concentration within 2 minutes of visible light exposure. It was further revealed that with an increase in the size of plasmonic nanoparticles beyond 0.08%, the accessible surface area of the Au nanoparticle decreases. The photon absorption capacity of Au nanoparticle decreases beyond 0.08% resulting in a decrease in electron transfer rate from Au to ZnO and a decrease of photocatalytic activity. Due to the industrialization process, most of the toxic materials go into the water bodies, affecting the water and our ecological system. The conventional techniques to remove dyes are expensive and inefficient. Recently, heterogeneous semiconductor materials like TiO2 and ZnO have been regarded as potential candidates for the removal of dye from the water system. To investigate the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface and the effect of the size of Au NPs for photocatalytic performance in the degradation process. A facile microwave method has been adopted for the synthesis of ZnO nanostructure followed by a reduction of gold salt in the presence of ZnO nanostructure to form the composite. ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity which degrades the dye concentration within 2 minutes of visible light exposure. The schematic mechanism of electron transfer rate was discussed. Raspberry shaped ZnO nanoparticles modified with different percentages of Au NPs showed good photocatalytic behavior in the degradation of dye molecules. The synergetic effect of unique morphology of ZnO and well anchored Au nanostructures plays a crucial role.
在本文中，我们探索了用金纳米粒子(Au NPs)修饰ZnO纳米结构的表面来控制其反应性的可能性。通过改变Au的wt% (x = 0.01, 0.05, 0.08, 1和2)，我们合成了一系列(ZnO/Aux)纳米复合材料(NCs)。研究了不同wt% Au NPs在zno纳米表面上的光催化性能。结果表明，ZnO/Au0.08纳米复合材料在不同Au浓度的ZnO表面表现出最高的光催化活性，在可见光照射2分钟内降解染料浓度。进一步发现，当等离子体纳米粒子的尺寸增加到0.08%以上时，金纳米粒子的可达表面积减小。Au纳米粒子的光子吸收能力降低到0.08%以上，导致Au到ZnO的电子转移速率降低，光催化活性降低。由于工业化进程，大部分有毒物质进入水体，影响水体和生态系统。传统的去除染料的技术既昂贵又低效。近年来，非均相半导体材料如TiO2和ZnO被认为是去除水中染料的潜在候选材料。研究不同wt% Au NPs在ZnO纳米表面的光催化性能，以及Au NPs尺寸对降解过程光催化性能的影响。采用微波法合成ZnO纳米结构，并在ZnO纳米结构存在下还原金盐形成复合材料，ZnO/Au0.08纳米复合材料具有最高的光催化活性，在可见光照射2分钟内降解染料浓度。讨论了电子转移的示意图机制。不同比例Au nps修饰的覆盆子状ZnO纳米粒子在降解染料分子方面表现出良好的光催化性能。氧化锌的独特形貌和良好锚定的金纳米结构的协同效应起着至关重要的作用。
{"title":"Tuning the Photocatalytic Performance of Plasmonic Nanocomposites (ZnO/Aux) Driven in Visible Light","authors":"Aneeya K. Samantara, D. Dash, Diptimoyee Bhuyan, Namita Dalai, Bijayalaxmi Jena","doi":"10.2174/2211544708666190124114519","DOIUrl":"https://doi.org/10.2174/2211544708666190124114519","url":null,"abstract":"\u0000\u0000In this article, we explored the possibility of controlling the reactivity of ZnO nanostructures\u0000by modifying its surface with gold nanoparticles (Au NPs). By varying the concentration of Au with\u0000different wt% (x = 0.01, 0.05, 0.08, 1 and 2), we have synthesized a series of (ZnO/Aux) nanocomposites\u0000(NCs). A thorough investigation of the photocatalytic performance of different wt% of Au NPs on\u0000ZnO nanosurface has been carried out. It was observed that ZnO/Au0.08 nanocomposite showed the highest\u0000photocatalytic activity among all concentrations of Au on the ZnO surface, which degrades the dye\u0000concentration within 2 minutes of visible light exposure. It was further revealed that with an increase in\u0000the size of plasmonic nanoparticles beyond 0.08%, the accessible surface area of the Au nanoparticle decreases.\u0000The photon absorption capacity of Au nanoparticle decreases beyond 0.08% resulting in a decrease\u0000in electron transfer rate from Au to ZnO and a decrease of photocatalytic activity.\u0000\u0000\u0000\u0000Due to the industrialization process, most of the toxic materials go into the water bodies,\u0000affecting the water and our ecological system. The conventional techniques to remove dyes are expensive\u0000and inefficient. Recently, heterogeneous semiconductor materials like TiO2 and ZnO have been\u0000regarded as potential candidates for the removal of dye from the water system.\u0000\u0000\u0000\u0000To investigate the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface\u0000and the effect of the size of Au NPs for photocatalytic performance in the degradation process.\u0000\u0000\u0000\u0000A facile microwave method has been adopted for the synthesis of ZnO nanostructure followed\u0000by a reduction of gold salt in the presence of ZnO nanostructure to form the composite.\u0000\u0000\u0000\u0000ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity which degrades the dye\u0000concentration within 2 minutes of visible light exposure. The schematic mechanism of electron transfer\u0000rate was discussed.\u0000\u0000\u0000\u0000Raspberry shaped ZnO nanoparticles modified with different percentages of Au NPs\u0000showed good photocatalytic behavior in the degradation of dye molecules. The synergetic effect of\u0000unique morphology of ZnO and well anchored Au nanostructures plays a crucial role.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75227508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-31DOI: 10.2174/2211550108666190418125857
Hemaprobha Saikia and Sanjay Basumatary
Layered double hydroxides (LDH) are drawing much attention as solid catalysts in recent years and have applications in various organic transformations as they possess a variety of basic sites which could be obtained by exchange of metal ions or by intercalation of suitable anions into their interlayer space. Ru based complexes have widespread catalytic applications in many organic reactions. Herein, novel ruthenium containing ternary LDH has been synthesized and used as a multifunctional catalyst for Aldol condensation and transfer hydrogenation reactions. Ternary LDH multifunctional catalyst containing Mg, Ru and Al was prepared by coprecipitation and hydrothermal treatment. The catalyst was characterized by elemental analysis, Powder XRD, FT-IR, BET, TGA, DRS, SEM, EDX, XPS and TEM. The products of the reactions were characterized by 1H NMR and GC-MS. The analysis of catalyst revealed incorporation of Ru in the brucite layers of the LDH and showed the mosaic single crystal with BET surface area of 84.25 m2 g-1. This catalyst yielded 85–98% products for Aldol condensation reactions within 4 h reaction time, and 82–98% products for transfer hydrogenation reactions within 16 h reaction time. The resultant MgRuAl-LDH with acid and base sites was found to be highly active and selective for one-step synthesis of nitrile compounds. The catalyst works more efficiently for Aldol condensation reactions in shorter reaction times compared to transfer hydrogenation reactions.
{"title":"MgRuAl-layered Double Hydroxides (LDH): An Efficient Multifunctional Catalyst for Aldol Condensation and Transfer Hydrogenation Reactions","authors":"Hemaprobha Saikia and Sanjay Basumatary","doi":"10.2174/2211550108666190418125857","DOIUrl":"https://doi.org/10.2174/2211550108666190418125857","url":null,"abstract":"\u0000\u0000 Layered double hydroxides (LDH) are drawing much attention as solid catalysts\u0000in recent years and have applications in various organic transformations as they possess a variety\u0000of basic sites which could be obtained by exchange of metal ions or by intercalation of suitable anions\u0000into their interlayer space. Ru based complexes have widespread catalytic applications in many organic\u0000reactions. Herein, novel ruthenium containing ternary LDH has been synthesized and used as a multifunctional\u0000catalyst for Aldol condensation and transfer hydrogenation reactions.\u0000\u0000\u0000\u0000Ternary LDH multifunctional catalyst containing Mg, Ru and Al was prepared by coprecipitation\u0000and hydrothermal treatment. The catalyst was characterized by elemental analysis, Powder\u0000XRD, FT-IR, BET, TGA, DRS, SEM, EDX, XPS and TEM. The products of the reactions were\u0000characterized by 1H NMR and GC-MS.\u0000\u0000\u0000\u0000The analysis of catalyst revealed incorporation of Ru in the brucite layers of the LDH and\u0000showed the mosaic single crystal with BET surface area of 84.25 m2 g-1. This catalyst yielded 85–98%\u0000products for Aldol condensation reactions within 4 h reaction time, and 82–98% products for transfer\u0000hydrogenation reactions within 16 h reaction time.\u0000\u0000\u0000\u0000The resultant MgRuAl-LDH with acid and base sites was found to be highly active and\u0000selective for one-step synthesis of nitrile compounds. The catalyst works more efficiently for Aldol\u0000condensation reactions in shorter reaction times compared to transfer hydrogenation reactions.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90883936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-10DOI: 10.2174/2211544707666180918153941
S. S. Chine, C. S. Patil, V. Gade
{"title":"Fly Ash Catalyzed Microwave Assisted Multicomponent Synthesis of Trisubstituted Imidazole Derivatives","authors":"S. S. Chine, C. S. Patil, V. Gade","doi":"10.2174/2211544707666180918153941","DOIUrl":"https://doi.org/10.2174/2211544707666180918153941","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78049043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-10DOI: 10.2174/2211544707666180702125931
S. S. Sabale, M. Degani
{"title":"Magnetically Recoverable Nano Sulfated Titania Catalysed One Pot Synthesis of 4(3H)-quinazolinone Derivatives","authors":"S. S. Sabale, M. Degani","doi":"10.2174/2211544707666180702125931","DOIUrl":"https://doi.org/10.2174/2211544707666180702125931","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73893759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-10DOI: 10.2174/2211544707666181023120026
Rodrigo M. S. Justo, Gustavo F. S. Andrade, G. Amarante
{"title":"Au Nanoparticles Catalyzed Chemoselective Aldehyde Oxidation/Amine Coupling to Imines","authors":"Rodrigo M. S. Justo, Gustavo F. S. Andrade, G. Amarante","doi":"10.2174/2211544707666181023120026","DOIUrl":"https://doi.org/10.2174/2211544707666181023120026","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88059150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-10DOI: 10.2174/2211544707666180629093850
Kalpesh Bhadra and Ganapati Yadav
{"title":"Insight into Acetylation of Anisyl Alcohol Using 20% (w/w) Cs2.5H0.5 PW12O40 Supported on Mesocelllular Foam (MCF) Silica","authors":"Kalpesh Bhadra and Ganapati Yadav","doi":"10.2174/2211544707666180629093850","DOIUrl":"https://doi.org/10.2174/2211544707666180629093850","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73023271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-10DOI: 10.2174/2211544707666180924125826
E. Mir, Ebrahim Mollashahi, G. Marandi
{"title":"Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones Using Carboxylic Acids as Catalyst","authors":"E. Mir, Ebrahim Mollashahi, G. Marandi","doi":"10.2174/2211544707666180924125826","DOIUrl":"https://doi.org/10.2174/2211544707666180924125826","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74080777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-30DOI: 10.2174/2211544707666181107111930
H. Suryawanshi, S. G. Bachhav, D. R. Patil
{"title":"The Effect of Adsorbed Hydroxyl Content on the Surface of TiO2 Nanorod Array and its Photocatalytic Degradation Study","authors":"H. Suryawanshi, S. G. Bachhav, D. R. Patil","doi":"10.2174/2211544707666181107111930","DOIUrl":"https://doi.org/10.2174/2211544707666181107111930","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79946513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-30DOI: 10.2174/2211544707666180831094741
Misael Cordoba, A. Ramírez, C. Miranda, Cecilia R. Lederhos, Alba N. Ardila, Y. Pouilloux
Fil: Cordoba Arroyo, Misael. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera"; Argentina. Universidad del Cauca; Colombia
线程:Cordoba Arroyo, Misael。国家科学技术研究委员会。Conicet科学技术中心-圣达菲。催化和石化研究所“Ing. Jose Miguel Parera”。滨海国立大学。催化和石化研究所“Ing. Jose Miguel Parera”;阿根廷。考卡大学;哥伦比亚
{"title":"Catalytic Activity of Co3O4 Supported on Activated Carbon for Alcohols Oxidation","authors":"Misael Cordoba, A. Ramírez, C. Miranda, Cecilia R. Lederhos, Alba N. Ardila, Y. Pouilloux","doi":"10.2174/2211544707666180831094741","DOIUrl":"https://doi.org/10.2174/2211544707666180831094741","url":null,"abstract":"Fil: Cordoba Arroyo, Misael. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica \"Ing. Jose Miguel Parera\". Universidad Nacional del Litoral. Instituto de Investigaciones en Catalisis y Petroquimica \"Ing. Jose Miguel Parera\"; Argentina. Universidad del Cauca; Colombia","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87288842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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