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Meng W, Xing B, Cheng S, Nie Y, Zeng H, Qu X, Xu B, Zhang C, Yu J, Won Hong S. Preparation of high quality carbon nanotubes by catalytic pyrolysis of waste plastics using FeNi-based catalyst. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 189:11-22. [PMID: 39142246 DOI: 10.1016/j.wasman.2024.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 07/01/2024] [Accepted: 08/06/2024] [Indexed: 08/16/2024]
Abstract
Plastic waste pollution is the serious environmental problem, and catalytic pyrolysis of waste plastics is an effective way to solve this problem. Carbon nanotubes (CNTs) are prepared by catalytic pyrolysis of low-density polyethylene (LDPE) waste plastics by one-stage method using iron nitrate and nickel nitrate as catalyst. The growth mechanism of CNTs is analyzed in detail. TPO, XRD, SEM and Raman analyses show that increasing Ni content contributes to the production of CNTs with good morphology and high graphitization degree. While the increasing Fe content contributes to improving the yield of CNTs. The outer and inner diameters of the FeNi12-CNTs-800 are about 21 nm and 8 nm with the length of 18.9 μm, respectively. LDPE pyrolysis gases are analyzed to determine that the primary carbon source required for CNTs growth is C2H4. The C2H4 adsorption and decomposition processes on FeNi alloys are performed to reveal the growth mechanism of CNTs, based on density functional theory calculation. Three kinds of the growth models are proposed to explain the difference of the CNTs tubular shape. FeNi12-CNTs-800 are used to remove microplastics from wastewater due to existence of magnetic. PVC can be quickly removed from wastewater with removal of 100 % at 20 min. This study provides an effective way for recycling and treatment of waste plastic.
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Affiliation(s)
- Weibo Meng
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Baolin Xing
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China; Henan International Joint Laboratory of Clean Coal Utilization, Jiaozuo 454003, China
| | - Song Cheng
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China.
| | - Yanhe Nie
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Huihui Zeng
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Xiaoxiao Qu
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Department of Cogno-Mechatronics Engineering, Department of Optics and Mechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Bing Xu
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Chuanxiang Zhang
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Jianglong Yu
- Southeast University-Monash University Joint Graduate School, and Suzhou Industrial Park Monash Research Institute of Science & Technology, Suzhou 215000, China
| | - Suck Won Hong
- Department of Cogno-Mechatronics Engineering, Department of Optics and Mechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea
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2
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Minj A, Sahu S, Singh Tanwar LK, Ghosh KK. Au@Ag nanoparticles: an analytical tool to study the effect of tyrosine on dopamine levels. RSC Adv 2024; 14:19271-19283. [PMID: 38887644 PMCID: PMC11181135 DOI: 10.1039/d4ra01872a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Accepted: 05/31/2024] [Indexed: 06/20/2024] Open
Abstract
The neurotransmitter dopamine (DA) plays important roles in the human body, including regulatory functions, movement, memory and motivational control. The direct intake of DA is impossible as it cannot cross the blood-brain barrier (BBB) efficiently. Notably, l-tyrosine works as a precursor of DA in the human brain. Herein, we report an analytical method that strongly supports the hypothesis that the intake of tyrosine (Tyr)-rich food enhances DA levels. For this analysis, citrate-coated gold-core silver-shell nanoparticles (Au@Ag NPs) were synthesized. The interaction of DA with the Au@Ag NPs was investigated using multiple spectroscopic techniques, and different thermodynamic parameters were evaluated to assign the binding mechanism. Real sample analysis with Tyr-rich food was also conducted to study the effect of Tyr on DA levels. Analytical studies were performed to verify the outcomes of the present work. The limit of detection of the Au@Ag NPs-DA system for Tyr was found to be 1.64 mM. This study can contribute to development in the fields of medicine and pharmaceuticals, particularly in regard to neuromedicine. One of the major advantages of this investigation is that it will fuel research interest in the supplementation of neurotransmitters and help categorize Tyr as a dietary precursor of dopamine.
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Affiliation(s)
- Angel Minj
- School of Studies in Chemistry, Pt. Ravishankar Shukla University Raipur-492010 Chhattisgarh India +91-94252 16204
| | - Sushama Sahu
- Govt. Narayanrao Meghawale Girls College Dhamtari Chhattisgarh India
| | - Lavkesh Kumar Singh Tanwar
- School of Studies in Chemistry, Pt. Ravishankar Shukla University Raipur-492010 Chhattisgarh India +91-94252 16204
| | - Kallol K Ghosh
- School of Studies in Chemistry, Pt. Ravishankar Shukla University Raipur-492010 Chhattisgarh India +91-94252 16204
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3
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Lee KX, Shameli K, Nagao Y, Yew YP, Teow SY, Moeini H. Potential use of gold-silver core-shell nanoparticles derived from Garcinia mangostana peel for anticancer compound, protocatechuic acid delivery. Front Mol Biosci 2022; 9:997471. [PMID: 36304924 PMCID: PMC9593088 DOI: 10.3389/fmolb.2022.997471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 09/12/2022] [Indexed: 11/26/2022] Open
Abstract
Colorectal cancer is one of the most killing cancers and this has become a global problem. Current treatment and anticancer drugs cannot specifically target the cancerous cells, thus causing toxicity towards surrounding non-cancer cells. Hence, there is an urgent need to discover a more target-specific therapeutic agent to overcome this problem. Core-shell nanoparticles have emerged as good candidate for anticancer treatment. This study aimed to synthesize core-shell nanoparticles via green method which utilised crude peels extract of Garcinia mangostana as reducing and stabilising agents for drug delivery. Gold-silver core-shell nanoparticles (Au-AgNPs) were synthesized through seed germination process in which gold nanoparticles acted as the seed. A complete coating was observed through transmission electron microscopy (TEM) when the ratio of AuNPs and AgNPs was 1:9. The size of Au-AgNPs was 38.22 ± 8.41 nm and was mostly spherical in shape. Plant-based drug, protocatechuic acid (PCA) was loaded on the Au-AgNPs to investigate their anticancer activity. In HCT116 colon cancer cells, PCA-loaded Au-AgNPs (IC50 = 10.78 μg/ml) showed higher inhibitory action than the free PCA (IC50= 148.09 μg/ml) and Au-AgNPs alone (IC50= 24.36 μg/ml). Up to 80% inhibition of HCT116 cells was observed after the treatment of PCA-loaded Au-AgNPs at 15.63 μg/ml. The PCA-loaded Au-AgNPs also showed a better selectivity towards HCT116 compared to CCD112 colon normal cells when tested at the same concentrations. These findings suggest that Au-AgNPs system can be used as a potent nanocarrier to combat cancerous cells by offering additional anticancer properties to the loaded drug.
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Affiliation(s)
- Kar Xin Lee
- Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia
| | - Kamyar Shameli
- Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia
- *Correspondence: Kamyar Shameli, ; Hassan Moeini,
| | - Yuki Nagao
- School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), Nomi, Japan
| | - Yen Pin Yew
- Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia
| | - Sin-Yeang Teow
- Department of Medical Sciences, School of Medical and Life Sciences (SMLS), Sunway University, Jalan Universiti, Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Hassan Moeini
- School of Medicine, Institute of Virology, Technical University of Munich, Munich, Germany
- *Correspondence: Kamyar Shameli, ; Hassan Moeini,
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4
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Optimization of the Synthesis of Fungus-Mediated Bi-Metallic Ag-Cu Nanoparticles. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12031384] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Bi-metallic nanoparticles (NPs) have appeared to be more efficient as antimicrobials than mono-metallic NPs. The fungus Aspergillus terreus-mediated synthesis of bi-metallic Ag-Cu NPs was optimized using response surface methodology (RSM) to reach the maximum yield of NPs. The optimal conditions were validated using ANOVA. The optimal conditions were 1.5 mM total metal (Ag + Cu) concentration, 1.25 mg fungal biomass, 350 W microwave power, and 15 min reaction time. The structure and shape of the synthesized NPs (mostly 20–30 nm) were characterized using several analytical tools. The biological activities of the synthesized NPs were assessed by studying their antioxidant, antibacterial, and cytotoxic activity in different NP concentrations. A dose-dependent response was observed in each test. Bi-metallic Ag-Cu NPs inhibited three clinically relevant human pathogens: Klebsiella pneumoniae, Enterobacter cloacae, and Pseudomonas aeruginosa. Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus were inhibited less. The DPPH and hydrogen peroxide scavenging activities of the NPs were high, reaching 90% scavenging. Ag-Cu NPs could be studied as antimicrobials in different applications. The optimization procedure using statistical analyses was successful in improving the yield of nanoparticles.
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5
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Arboleda DM, Ibañez FJ. Improved Electrocatalysis and Electrophoretic Deposition due to the Strong Synergy between Au and Ag Nanoparticles. ChemistrySelect 2020. [DOI: 10.1002/slct.202002616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- David Muñetón Arboleda
- Instituto de Investigaciones FisicoquímicasTeóricas y Aplicadas (INIFTA). Universidad Nacional de La Plata - CONICET. Sucursal 4 Casilla de Correo 16 (1900) La Plata Argentina
| | - Francisco J. Ibañez
- Instituto de Investigaciones FisicoquímicasTeóricas y Aplicadas (INIFTA). Universidad Nacional de La Plata - CONICET. Sucursal 4 Casilla de Correo 16 (1900) La Plata Argentina
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Pei Y, Wang L, Huang L, Hu Y, Jia Q, Zhang H, Zhang S. ISOBAM-stabilized Ni 2+ colloidal catalysts: high catalytic activities for hydrogen generation from hydrolysis of KBH 4. NANOTECHNOLOGY 2020; 31:134003. [PMID: 31783396 DOI: 10.1088/1361-6528/ab5d58] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
ISOBAM-104-stabilized Ni2+ colloidal catalysts were synthesized through a facile method and used for hydrogen generation from hydrolysis of potassium borohydride (KBH4). Ni nanoparticles (NPs) were formed as the active phase during the catalytic process. Ultraviolet-visible spectrophotometry (UV-vis) and transmission electron microscopy were employed to characterize the structure and particle size of the as-formed Ni NPs. The results suggested that the catalytic activity of Ni2+ colloidal catalyst increased with the decreased size of as-formed Ni NPs, which is consistent with the results of density functional theory calculation. The highest catalytic activity of the catalyst can be 12400 ml-H2 min-1 g-Ni-1, which was even higher than that of noble Pt or Pd colloidal catalysts prepared using identical methods and catalytic conditions. According to the Arrhenius method, the ISOBAM-104-stabilized Ni2+ colloidal catalysts showed low activation energies of about 41.3 kJ mol-1 for the hydrogen generation from hydrolysis basic KBH4 solution.
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Affiliation(s)
- Yuantao Pei
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China
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7
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Vinotha Alex A, Chandrasekaran N, Mukherjee A. Novel enzymatic synthesis of core/shell AgNP/AuNC bimetallic nanostructure and its catalytic applications. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112463] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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8
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Sakono N, Omori K, Yamamoto K, Ishikuro N, Sakono M. Vapor-phase Synthesis of Bimetallic Plasmonic Nanoparticles. ANAL SCI 2020; 36:61-65. [PMID: 31761816 DOI: 10.2116/analsci.19sap06] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Regulating the nanostructure of composite nanoparticles is essential for making them suitable for various applications. In general, the chemical reduction method is employed for preparing metal nanoparticles in the liquid phase. However, complicated techniques are required to control the nanostructure during particle synthesis. The evaporation/condensation method is used for synthesizing nanoparticles in the vapor-phase. Although this method produces impurity-free particles without aggregation, very few studies have been carried out on the synthesis of composite particles in the vapor-phase. In this study, we synthesized composite nanoparticles in the vapor-phase by using the evaporation/condensation method. The results showed that bimetallic nanoparticles are produced by this method. Moreover, it was indicated that the nanostructure of the synthesized nanoparticles is influenced by the order of the electric furnace with different temperatures.
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Affiliation(s)
- Naomi Sakono
- Department of Applied Chemistry and Chemical Engineering, National Institute of Technology, Toyama College
| | - Kazuki Omori
- Department of Applied Chemistry and Chemical Engineering, National Institute of Technology, Toyama College
| | - Koki Yamamoto
- Department of Applied Chemistry and Chemical Engineering, National Institute of Technology, Toyama College
| | - Naru Ishikuro
- Department of Applied Chemistry and Chemical Engineering, National Institute of Technology, Toyama College
| | - Masafumi Sakono
- Department of Applied Chemistry, Faculty of Engineering, University of Toyama
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9
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Arias PL, Cecilia JA, Gandarias I, Iglesias J, López Granados M, Mariscal R, Morales G, Moreno-Tost R, Maireles-Torres P. Oxidation of lignocellulosic platform molecules to value-added chemicals using heterogeneous catalytic technologies. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00240b] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This minireview gives an overview about heterogeneous catalytic technologies for the oxidation of key platform molecules (glucose, 5-hydroxymethylfurfural, furfural and levulinic acid) into valuable chemicals.
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Affiliation(s)
- Pedro L. Arias
- Chemical and Environmental Engineering Department
- University of the Basque Country (UPV-EHU)
- Bilbao
- Spain
| | - Juan A. Cecilia
- Universidad de Málaga
- Departamento de Química Inorgánica
- Cristalografia y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Campus de Teatinos
| | - Iñaki Gandarias
- Chemical and Environmental Engineering Department
- University of the Basque Country (UPV-EHU)
- Bilbao
- Spain
| | - José Iglesias
- Chemical and Environmental Engineering Group
- Universidad Rey Juan Carlos
- Móstoles
- Spain
| | - Manuel López Granados
- Institute of Catalysis and Petrochemistry (CSIC)
- C/Marie Curie, 2
- Campus de Cantoblanco
- Madrid
- Spain
| | - Rafael Mariscal
- Institute of Catalysis and Petrochemistry (CSIC)
- C/Marie Curie, 2
- Campus de Cantoblanco
- Madrid
- Spain
| | - Gabriel Morales
- Chemical and Environmental Engineering Group
- Universidad Rey Juan Carlos
- Móstoles
- Spain
| | - Ramón Moreno-Tost
- Universidad de Málaga
- Departamento de Química Inorgánica
- Cristalografia y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Campus de Teatinos
| | - Pedro Maireles-Torres
- Universidad de Málaga
- Departamento de Química Inorgánica
- Cristalografia y Mineralogía (Unidad Asociada al ICP-CSIC)
- Facultad de Ciencias
- Campus de Teatinos
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10
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Xu J, Luo F, Li J, Yang K, Li H. Poly (amic acid) Salt‐stabilized Au‐Ag Alloy Nanoparticles as Efficient and Recyclable Quasi‐homogeneous Catalysts for the Imines Synthesis from Alcohols and Amines in Water. ChemistrySelect 2019. [DOI: 10.1002/slct.201902475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jiali Xu
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Faguo Luo
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Jun Li
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and ChemistryHunan University of Technology 88 Taishan Road Zhuzhou 412007 China
| | - Ke Yang
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
| | - Hengfeng Li
- School of Materials Science and EngineeringCentral South University 932 South Lushan Road Changsha 410083 China
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11
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Pei Y, Huang L, Wang J, Han L, Li S, Zhang S, Zhang H. Recent progress in the synthesis and applications of 2D metal nanosheets. NANOTECHNOLOGY 2019; 30:222001. [PMID: 30743250 DOI: 10.1088/1361-6528/ab0642] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The design and controlled synthesis of two-dimensional (2D) nanomaterials have been widely studied because the properties and functions of nanomaterials are highly dependent on their sizes, shapes, and dimensionalities. For instance, 2D metal nanosheets (2DMNSs) have attracted a significant amount of attention owing to their interesting properties, which are absent in corresponding bulk counterparts, and they have been confirmed to have potential applications in electrocatalysis, optics, and biomedicine. However, because of the close-packed structures of metals, the large-scale fabrication of 2DMNSs is challenging. In this review, we have outlined the research progress in the field of 2DMNSs, including the typical synthesis approaches and newly developed methods, as well as promising applications of the materials reported in recent years. Moreover, some preliminary and promising strategies to further improve the properties of 2DMNSs and some insights for the development of the field have been included.
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Affiliation(s)
- Yuantao Pei
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China
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12
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Iron-nickel bimetallic nanoparticles: Surfactant assisted synthesis and their catalytic activities. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Liao G, Fang J, Li Q, Li S, Xu Z, Fang B. Ag-Based nanocomposites: synthesis and applications in catalysis. NANOSCALE 2019; 11:7062-7096. [PMID: 30931457 DOI: 10.1039/c9nr01408j] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Ag-Based nanocomposites, including supported Ag nanocomposites and bimetallic Ag nanocomposites, have been intensively investigated as highly efficient catalysts because of their high activity and stability, easy preparation, low cost, and low toxicity. Herein, we systematically summarize and comprehensively evaluate versatile synthetic strategies for the preparation of Ag-based nanocomposites, and outline their recent advances in catalytic oxidation, catalytic reduction, photocatalysis and electrocatalysis. In addition, the challenges and prospects related to Ag-based nanocomposites for various catalytic applications are also discussed. In light of the most recent advances in Ag-based nanocomposites for catalysis applications, this review provides a comprehensive assessment on the material selection, synthesis and catalytic characteristics of these catalysts, which offers a strategic guide to build a close connection between Ag nanocomposites and catalysis applications.
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Affiliation(s)
- Guangfu Liao
- School of Environment and Civil Engineering, Dongguan University of Technology, Guangdong 523808, China.
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14
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Imura Y, Akiyama R, Furukawa S, Kan R, Morita-Imura C, Komatsu T, Kawai T. Au-Ag Nanoflower Catalysts with Clean Surfaces for Alcohol Oxidation. Chem Asian J 2019; 14:547-552. [PMID: 30600927 DOI: 10.1002/asia.201801711] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 12/25/2018] [Indexed: 12/30/2022]
Abstract
Shape-controlled metal nanocrystals, such as nanowires and nanoflowers, are attractive owing to their potentially novel catalytic properties and bimetallic nanocrystals composed of two distinct metals are expected to act as highly active catalysts. However, their catalytic activities are limited because of the capping agents adsorbed on the metal surfaces, which are necessary for the preparation and dispersion of these nanocrystals in solvents. Therefore, the preparation of bimetallic shape-controlled noble metal nanocrystals with clean surfaces, devoid of almost all capping agents, are expected to have high catalytic activity. Herein, we report the preparation of bimetallic Au-Ag nanoflowers using melamine as the capping agent. The bimetallic Au-Ag nanoflowers with a clean surface were subsequently obtained by a support and extraction method. The bimetallic nanoflowers with a clean surface were then used for the aerobic oxidation of 1-phenylethyl alcohol and they exhibited high rates for the formation of acetophenone compared to Au nanoflowers and spherical nanoparticles with almost the same size and Au/Ag ratio. We also show that Au-Ag nanoflowers containing only 1 % Ag (Au99 -Ag1 NFs) exhibit the highest rate of acetophenone formation among Au-Ag nanoflowers with different Au/Ag ratios owing to an increase in the electron density of the Au atoms that act as active sites for the oxidation of 1-phenylethyl alcohol.
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Affiliation(s)
- Yoshiro Imura
- Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.,Department of Chemistry, Tokyo Institute of Technology, 2-12-1-E1-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Ryota Akiyama
- Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Shinya Furukawa
- Institute for Catalysis, Hokkaido University, N21, W10, Kita-ku, Sapporo, 001-0021, Japan
| | - Ryota Kan
- Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Clara Morita-Imura
- Faculty of Core Research, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, 112-8610, Japan
| | - Takayuki Komatsu
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1-E1-10 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Takeshi Kawai
- Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
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15
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Cattaneo S, Stucchi M, Villa A, Prati L. Gold Catalysts for the Selective Oxidation of Biomass‐Derived Products. ChemCatChem 2018. [DOI: 10.1002/cctc.201801243] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Stefano Cattaneo
- Dipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 Milano 20133 Italy
| | - Marta Stucchi
- Dipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 Milano 20133 Italy
| | - Alberto Villa
- Dipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 Milano 20133 Italy
| | - Laura Prati
- Dipartimento di ChimicaUniversità degli Studi di Milano Via Golgi 19 Milano 20133 Italy
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16
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Synthesis of Carbon Nanotube Arrays with High Aspect Ratio via Ni-Catalyzed Pyrolysis of Waste Polyethylene. NANOMATERIALS 2018; 8:nano8070556. [PMID: 30037121 PMCID: PMC6070808 DOI: 10.3390/nano8070556] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 07/16/2018] [Accepted: 07/18/2018] [Indexed: 11/19/2022]
Abstract
Carbon nanotube (CNT) arrays 30–50 nm in diameter and with a length of several micrometers were prepared by catalytic pyrolysis of waste polyethylene in Ar at 773−1073 K using nickel dichloride as a catalyst precursor. X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectrometry (Raman), a vibrating-sample magnetometer (VSM), and nitrogen adsorption/desorption were used to investigate the effects of the pyrolysis temperature and catalyst contents on the preparation of the aligned CNTs. As results, the as-obtained CNTs had an outer diameter of 30 nm, a wall thickness of 10 nm, and a length of about 50 μm, and their aspect ratio was high up to 1500. The aligned CNTs containing 0.75 wt% Ni prepared at 973 K exhibited good adsorption performance for methylene blue (MB); furthermore, benefiting from the special magnetic properties of residual Ni catalysts, the as-obtained CNTs could be easily magnetically recycled from the treated solution after adsorption.
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17
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Müller A, Peglow S, Karnahl M, Kruth A, Junge H, Brüser V, Scheu C. Morphology, Optical Properties and Photocatalytic Activity of Photo- and Plasma-Deposited Au and Au/Ag Core/Shell Nanoparticles on Titania Layers. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E502. [PMID: 29986457 PMCID: PMC6070863 DOI: 10.3390/nano8070502] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 06/28/2018] [Accepted: 07/04/2018] [Indexed: 11/22/2022]
Abstract
Titania is a promising material for numerous photocatalytic reactions such as water splitting and the degradation of organic compounds (e.g., methanol, phenol). Its catalytic performance can be significantly increased by the addition of co-catalysts. In this study, Au and Au/Ag nanoparticles were deposited onto mesoporous titania thin films using photo-deposition (Au) and magnetron-sputtering (Au and Au/Ag). All samples underwent comprehensive structural characterization by grazing incidence X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Nanoparticle distributions and nanoparticle size distributions were correlated to the deposition methods. Light absorption measurements showed features related to diffuse scattering, the band gap of titania and the local surface plasmon resonance of the noble metal nanoparticles. Further, the photocatalytic activities were measured using methanol as a hole scavenger. All nanoparticle-decorated thin films showed significant performance increases in hydrogen evolution under UV illumination compared to pure titania, with an evolution rate of up to 372 μL H₂ h−1 cm−2 representing a promising approximately 12-fold increase compared to pure titania.
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Affiliation(s)
- Alexander Müller
- Max-Planck-Institut für Eisenforschung GmbH (MPIE), Max-Planck-Straße 1, 40237 Düsseldorf, Germany.
- Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 5-13, 81377 Munich, Germany.
| | - Sandra Peglow
- Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany.
| | - Michael Karnahl
- Leibniz Institute for Catalysis at the University of Rostock (LIKAT), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Angela Kruth
- Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany.
| | - Henrik Junge
- Leibniz Institute for Catalysis at the University of Rostock (LIKAT), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Volker Brüser
- Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, 17489 Greifswald, Germany.
| | - Christina Scheu
- Max-Planck-Institut für Eisenforschung GmbH (MPIE), Max-Planck-Straße 1, 40237 Düsseldorf, Germany.
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18
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Hirakawa K, Kaneko T, Toshima N. Kinetics of Spontaneous Bimetallization between Silver and Noble Metal Nanoparticles. Chem Asian J 2018; 13:1892-1896. [PMID: 29870120 DOI: 10.1002/asia.201800633] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/28/2018] [Indexed: 01/23/2023]
Abstract
A physical mixture of polymer-protected Ag nanoparticles and Rh, Pd, or Pt nanoparticles spontaneously forms Ag-core bimetallic nanoparticles. The formed nanoparticles were smaller than the parent Ag nanoparticles. In the initial process of this reaction, the surface plasmon absorption of Ag nanoparticles diminished and then almost ceased within one hour. Within several minutes, the decrease in Ag surface plasmon absorption could be analyzed by second-order reaction. This reaction was accelerated with an increase of temperature and the energy gap in the Fermi level between Ag and the other metals. The activation energy (Ea ) of this reaction could be determined. An electron transfer reaction from Ag to other metal nanoparticles was proposed as the initial interaction between these metal nanoparticles because the Fermi level of Ag is relatively high, and the electron transfer is possible in terms of energy. The Marcus plot between the rate constant and the driving force, roughly estimated from the work function of metals, and the observed Ea values reasonably explained the proposed electron transfer mechanism.
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Affiliation(s)
- Kazutaka Hirakawa
- Department of Applied Chemistry and Biochemical Engineering, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan
| | - Tetsuya Kaneko
- Department of Applied Chemistry and Biochemical Engineering, Shizuoka University, Johoku 3-5-1, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan
| | - Naoki Toshima
- Division of Thermoelectrics for Waste Heat Recovery, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
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19
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Preparation and length control of water-dispersible ultrathin gold and silver bimetallic nanowires. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.01.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Zhang Z, Huber GW. Catalytic oxidation of carbohydrates into organic acids and furan chemicals. Chem Soc Rev 2018; 47:1351-1390. [DOI: 10.1039/c7cs00213k] [Citation(s) in RCA: 324] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A review on the development of new routes for the production of organic acids and furan compoundsviacatalytic oxidation reactions.
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Affiliation(s)
- Zehui Zhang
- Key Laboratory of Catalysis and Material Sciences of the State Ethnic Affairs Commission & Ministry of Education
- College of Chemistry and Material Sciences
- South-Central University for Nationalities
- Wuhan
- China
| | - George W. Huber
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- Madison
- USA
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21
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Jiao C, Pei Y, Wang L, Zhang H, Huang Z, Dai Y, Liang F, Liu S, Wang Y, Zhang S. Facile synthesis of 1.3 nm monodispersed Ag nanoclusters in an aqueous solution and their antibacterial activities for E. coli. RSC Adv 2018; 8:30207-30214. [PMID: 35546856 PMCID: PMC9085391 DOI: 10.1039/c8ra04387f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 08/13/2018] [Indexed: 11/21/2022] Open
Abstract
A facile one-pot strategy was developed to prepare ultrastable monodispersed Ag nanoclusters (NCs) in aqueous solution by using ISOBAM-104, as a stabilizing agent. The as-prepared Ag NCs with an average size of 1.3 nm, which can be preserved in water solution for more than one year under ambient conditions without obvious agglomeration, exhibited excellent antibacterial activities for E. coli (DH5α), compared to most of the previously reported results. Ag NCs of 1.3 nm prepared by a facile one-pot strategy exhibit excellent antibacterial activities for E. coli.![]()
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Affiliation(s)
- Chengpeng Jiao
- The State Key Laboratory of Refractories and Metallurgy
- Wuhan University of Science and Technology
- Wuhan 430081
- China
- Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgical Mineral Resources
| | - Yuantao Pei
- The State Key Laboratory of Refractories and Metallurgy
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Liqiong Wang
- The State Key Laboratory of Refractories and Metallurgy
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Haijun Zhang
- The State Key Laboratory of Refractories and Metallurgy
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Zili Huang
- Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgical Mineral Resources
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Yuhuan Dai
- Institute of Biology and Medicine
- Wuhan University of Science and Technology
- Wuhan 430065
- China
| | - Feng Liang
- College of Chemical Engineering and Technology
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Simin Liu
- College of Chemical Engineering and Technology
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Yuhua Wang
- Hubei Province Key Laboratory of Science in Metallurgical Process
- Wuhan University of Science and Technology
- Wuhan 430081
- China
| | - Shaowei Zhang
- College of Engineering
- Mathematics and Physical Sciences
- University of Exeter
- Exeter EX4 4QF
- UK
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22
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Preparation of Rh/Ni Bimetallic Nanoparticles and Their Catalytic Activities for Hydrogen Generation from Hydrolysis of KBH4. Catalysts 2017. [DOI: 10.3390/catal7040125] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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23
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KIM GW, HA JW. Platinum-coated Core-Shell Gold Nanorods as Multifunctional Orientation Sensors in Differential Interference Contrast Microscopy. ANAL SCI 2017; 33:1021-1025. [DOI: 10.2116/analsci.33.1021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Geun Wan KIM
- Advanced Nano Bio Imaging and Spectroscopy (ANBIS) Laboratory, Department of Chemistry, University of Ulsan
| | - Ji Won HA
- Advanced Nano Bio Imaging and Spectroscopy (ANBIS) Laboratory, Department of Chemistry, University of Ulsan
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24
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E A K N, S D, Narayanan V, A S. Chitosan stabilized Ag-Au nanoalloy for colorimetric sensing and 5-Fluorouracil delivery. Int J Biol Macromol 2016; 95:862-872. [PMID: 27773838 DOI: 10.1016/j.ijbiomac.2016.10.066] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 10/15/2016] [Accepted: 10/19/2016] [Indexed: 01/28/2023]
Abstract
Fluorescent CS/Ag-Au (chitosan/silver-gold) nanocomposite containing different weight percentage of Ag and Au was synthesized using the chemical reduction method. 5-Fluorouracil (5-FU) encapsulated nanocomposite was also synthesized and its cytotoxicity towards breast cancer cell lines (MCF-7) studied. The XRD pattern of the nanocomposite shows peaks of chitosan, silver and gold. The peaks corresponding to gold and silver indicate the face centered cubic structure of silver and gold nanoparticles. The polymer matrix nanocomposite structure with chitosan as the matrix and silver-gold as the filler phase is evident from the high resolution transmission electron microscopy (HRTEM) images and an increase in particle size from∼5nm to about 12nm is noticeable on encapsulation of 5-Fluorouracil (5-FU). The presence of fluorine in the case of 5-FU encapsulated nanocomposite and the presence of reflections corresponding to 5-FU in the SAED pattern confirms the encapsulation of 5-FU into the nanocomposite, which is also confirmed by elemental mapping. The presence of a single surface plasmon resonance (SPR) peak in the case of the nanocomposite in a position in between the SPR bands of pure silver and gold nanoparticles confirms the formation of Ag-Au alloy and the elemental mapping results obtained for the nanocomposite also supports the UV-vis results. The photoluminescence (PL) spectrum clearly shows an emission peak in the near infrared region (700-900nm), which makes the nanocomposite suitable for use in cellular imaging. The application of the nanocomposite as a colorimetric sensor was also studied and it was found to be useful for the specific detection of mercury (Hg) without much interference and the detection limit was found to be 5.0×10-8M.
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Affiliation(s)
- Nivethaa E A K
- Material Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai-25, India
| | - Dhanavel S
- Material Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai-25, India
| | - V Narayanan
- Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600025, India
| | - Stephen A
- Material Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai-25, India.
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25
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Advances in polymer-stabilized Au nano-cluster catalysis : Interplay of theoretical calculations and experiments. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(16)62463-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Zhang X, Wilson K, Lee AF. Heterogeneously Catalyzed Hydrothermal Processing of C 5-C 6 Sugars. Chem Rev 2016; 116:12328-12368. [PMID: 27680093 DOI: 10.1021/acs.chemrev.6b00311] [Citation(s) in RCA: 197] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Biomass has been long exploited as an anthropogenic energy source; however, the 21st century challenges of energy security and climate change are driving resurgence in its utilization both as a renewable alternative to fossil fuels and as a sustainable carbon feedstock for chemicals production. Deconstruction of cellulose and hemicellulose carbohydrate polymers into their constituent C5 and C6 sugars, and subsequent heterogeneously catalyzed transformations, offer the promise of unlocking diverse oxygenates such as furfural, 5-hydroxymethylfurfural, xylitol, sorbitol, mannitol, and gluconic acid as biorefinery platform chemicals. Here, we review recent advances in the design and development of catalysts and processes for C5-C6 sugar reforming into chemical intermediates and products, and highlight the challenges of aqueous phase operation and catalyst evaluation, in addition to process considerations such as solvent and reactor selection.
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Affiliation(s)
- Xingguang Zhang
- European Bioenergy Research Institute, Aston University , Birmingham B4 7ET, United Kingdom
| | - Karen Wilson
- European Bioenergy Research Institute, Aston University , Birmingham B4 7ET, United Kingdom
| | - Adam F Lee
- European Bioenergy Research Institute, Aston University , Birmingham B4 7ET, United Kingdom
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27
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Preparation and Catalytic Activity for Aerobic Glucose Oxidation of Crown Jewel Structured Pt/Au Bimetallic Nanoclusters. Sci Rep 2016; 6:30752. [PMID: 27476577 PMCID: PMC4967863 DOI: 10.1038/srep30752] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/07/2016] [Indexed: 11/29/2022] Open
Abstract
Understanding of the “structure-activity” relations for catalysts at an atomic level has been regarded as one of the most important objectives in catalysis studies. Bimetallic nanoclusters (NCs) in its many types, such as core/shell, random alloy, cluster-in-cluster, bi-hemisphere, and crown jewel (one kind of atom locating at the top position of another kind of NC), attract significant attention owing to their excellent optical, electronic, and catalytic properties. PVP-protected crown jewel-structured Pt/Au (CJ-Pt/Au) bimetallic nanoclusters (BNCs) with Au atoms located at active top sites were synthesized via a replacement reaction using 1.4-nm Pt NCs as mother clusters even considering the fact that the replacement reaction between Pt and Au3+ ions is difficult to be occurred. The prepared CJ-Pt/Au colloidal catalysts characterized by UV-Vis, TEM, HR-TEM and HAADF-STEM-EELS showed a high catalytic activity for aerobic glucose oxidation, and the top Au atoms decorating the Pt NCs were about 15 times more active than the Au atoms of Au NCs with similar particle size.
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28
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Kühn L, Herrmann AK, Rutkowski B, Oezaslan M, Nachtegaal M, Klose M, Giebeler L, Gaponik N, Eckert J, Schmidt TJ, Czyrska-Filemonowicz A, Eychmüller A. Alloying Behavior of Self-Assembled Noble Metal Nanoparticles. Chemistry 2016; 22:13446-50. [DOI: 10.1002/chem.201602487] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Laura Kühn
- Physical Chemistry; TU Dresden; Bergstr. 66b 01069 Dresden Germany
| | | | - Bogdan Rutkowski
- International Centre of Electron Microscopy for Material Science and Faculty of Metals Engineering and Industrial Computer Science; AGH University of Science and Technology Krakow; Al. Adama Mickiewicza 30 30-059 Krakow Poland
| | - Mehtap Oezaslan
- Paul Scherrer Institute; 5232 Villigen Switzerland
- Institute of Chemistry; Carl von Ossietzky University of Oldenburg; Carl-von-Ossietzky Str. 9-11 26111 Oldenburg Germany
| | | | - Markus Klose
- Institute for Complex Materials; IFW Dresden; PO 27 01 16 01171 Dresden Germany
| | - Lars Giebeler
- Institute for Complex Materials; IFW Dresden; PO 27 01 16 01171 Dresden Germany
| | - Nikolai Gaponik
- Physical Chemistry; TU Dresden; Bergstr. 66b 01069 Dresden Germany
| | - Jürgen Eckert
- Institute for Complex Materials; IFW Dresden; PO 27 01 16 01171 Dresden Germany
- Institute of Materials Science; TU Dresden; Helmholtzstrasse 7 01069 Dresden Germany
- Erich Schmid Institute of Materials Science; Austrian Academy of Sciences and Department Materials Physics; Montanuniversität Leoben; Jahnstrasse 12 8700 Leoben Austria
| | - Thomas J. Schmidt
- Paul Scherrer Institute; 5232 Villigen Switzerland
- Laboratory of Physical Chemistry; ETH Zürich; 8093 Zürich Switzerland
| | - Aleksandra Czyrska-Filemonowicz
- International Centre of Electron Microscopy for Material Science and Faculty of Metals Engineering and Industrial Computer Science; AGH University of Science and Technology Krakow; Al. Adama Mickiewicza 30 30-059 Krakow Poland
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29
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Ishida T, Koga H, Okumura M, Haruta M. Advances in Gold Catalysis and Understanding the Catalytic Mechanism. CHEM REC 2016; 16:2278-2293. [DOI: 10.1002/tcr.201600046] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Tamao Ishida
- Research Center for Gold Chemistry Graduate School of Urban Environmental Sciences Tokyo Metropolitan University; 1-1 Minami-osawa Hachioji Tokyo 192-0397 Japan
| | - Hiroaki Koga
- Elements Strategy Initiative for Catalysts and Batteries (ESICB); Kyoto University; 1-30 Goryoohara Kyoto 615-8245 Japan
| | - Mitsutaka Okumura
- Elements Strategy Initiative for Catalysts and Batteries (ESICB); Kyoto University; 1-30 Goryoohara Kyoto 615-8245 Japan
- Department of Chemistry Graduate School of Science; Osaka University; 1-1 Machikaneyama Toyonaka Osaka 560-0043 Japan
| | - Masatake Haruta
- Research Center for Gold Chemistry Graduate School of Urban Environmental Sciences Tokyo Metropolitan University; 1-1 Minami-osawa Hachioji Tokyo 192-0397 Japan
- Gold Catalysis Research Center Dalian Institute of Chemical Physics; 457 Zhongshan Road Dalian 116023 P. R. China
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30
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Lee SY, Ha JW. Characterizing the optical properties of single palladium-coated core–shell gold nanorods as multifunctional orientation probes. Phys Chem Chem Phys 2016; 18:32682-32685. [DOI: 10.1039/c6cp07280a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bimetallic core–shell gold nanorods are promising multifunctional orientation probes due to the synergetic effect of two different metals, as examined under an optical microscope.
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Affiliation(s)
- So Young Lee
- Advanced Nano Bio Imaging and Spectroscopy (ANBIS) Laboratory
- Department of Chemistry
- University of Ulsan
- Ulsan 44610
- South Korea
| | - Ji Won Ha
- Advanced Nano Bio Imaging and Spectroscopy (ANBIS) Laboratory
- Department of Chemistry
- University of Ulsan
- Ulsan 44610
- South Korea
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31
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Pietsch T, Müller-Buschbaum P, Mahltig B, Fahmi A. Nanoporous Thin Films and Binary Nanoparticle Superlattices Created by Directed Self-Assembly of Block Copolymer Hybrid Materials. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12440-12449. [PMID: 25647185 DOI: 10.1021/am5076056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The design and development of well-defined, functional nanostructures via self-assembly is one of the key objectives in current nanotechnology. Block copolymer-based hybrid materials are attractive candidates for the fabrication of multifunctional nanostructures, which provide the building blocks for more complex nanoarchitectures and nanodevices. However, one of the major challenges lies in controlling the structure formation in these hybrid materials by guiding the self-assembly of the block copolymer. Here, hierarchical nanoporous structures are fabricated via guided multistep self-assembly of diblock copolymer micellar solutions onto hydrophilic solid substrates. The core of polystyrene-block-poly[4-vinylpyridine] micelles serves as a nanoreactor for the preparation of size-controlled gold nanoparticles. Deposition of thin films of the micellar solution in combination with a nonselective cosolvent (THF), on hydrophilic surfaces leads to the formation of hierarchical nanoporous structures. The micellar films exhibit two different pore diameters and a total pore density of more than 10(10) holes per cm2. Control over the pore diameter is achieved by adapting the molecular weight of the polystyrene-block-poly[4-vinylpyridine] diblock copolymer. Moreover, the porous morphology is used as a template for the fabrication of bimetallic nanostructured thin films. The PS-b-P4VP template is subsequently removed by oxygen plasma etching, leaving behind binary nanoparticle structures that mimic the original thin film morphology.
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Affiliation(s)
- Torsten Pietsch
- †Manufacturing Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Peter Müller-Buschbaum
- §Physik-Department, Lehrstuhl für Funktionelle Materialien, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Boris Mahltig
- ⊥Faculty of Textile and Clothing Technology, Niederrhein University of Applied Sciences, Webschulstrasse 31, 41065 Mönchengladbach, Germany
| | - Amir Fahmi
- †Manufacturing Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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32
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Bimetallic Au–Ag/SiO2 catalysts: comparison in glucose, benzyl alcohol and CO oxidation reactions. REACTION KINETICS MECHANISMS AND CATALYSIS 2015. [DOI: 10.1007/s11144-015-0835-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Rameshkumar P, Saranya S, Sujatha K, Ramaraj R. In situ formation of gold/silver bi-metal nanodots on silica spheres and evaluation of their microbicidal properties. RSC Adv 2015. [DOI: 10.1039/c4ra12042f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An environmentally benign synthetic method of seedless and one-step growth of 2–4 nm sized gold/silver bi-metal nanodots on preformed silica spheres and their microbicidal properties with different concentrations of Au and Ag are reported.
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Affiliation(s)
- Perumal Rameshkumar
- Centre for Photoelectrochemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625 021
- India
| | - Selvam Saranya
- Networking Resource Centre in Biological Sciences
- School of Biological Sciences
- Madurai Kamaraj University
- Madurai-21
- India
| | - Kabilan Sujatha
- Networking Resource Centre in Biological Sciences
- School of Biological Sciences
- Madurai Kamaraj University
- Madurai-21
- India
| | - Ramasamy Ramaraj
- Centre for Photoelectrochemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625 021
- India
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34
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Holden MS, Nick KE, Hall M, Milligan JR, Chen Q, Perry CC. Synthesis and Catalytic Activity of Pluronic Stabilized Silver-Gold Bimetallic Nanoparticles. RSC Adv 2014; 4:52279-52288. [PMID: 25580244 PMCID: PMC4286189 DOI: 10.1039/c4ra07581a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In this report, we demonstrate a rapid, simple, and green method for synthesizing silver-gold (Ag-Au) bimetallic nanoparticles (BNPs). We used a novel modification to the galvanic replacement reaction by suspending maltose coated silver nanoparticles (NPs) in ≈ 2% aqueous solution of EO100PO65EO100 (Pluronic F127) prior to HAuCl4 addition. The Pluronic F127 stabilizes the BNPs, imparts biocompatibility, and mitigates the toxicity issues associated with other surfactant stabilizers. BNPs with higher Au:Ag ratios and, subsequently, different morphologies were successfully synthesized by increasing the concentration of gold salt added to the Ag NP seeds. These BNPs have enhanced catalytic activities than typically reported for monometallic Au or Ag NPs (∼ 2-10 fold) of comparable sizes in the sodium borohydride reduction of 4-nitrophenol. The 4-nitrophenol reduction rates were highest for partially hollow BNP morphologies.
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Affiliation(s)
- Megan S. Holden
- Department of Basic Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350
| | - Kevin E. Nick
- Department of Earth and Biological Sciences, School of Medicine, Loma Linda University, Loma Linda, CA 92350
| | - Mia Hall
- Elizabeth City State University, 1704 Weeksville Rd, Elizabeth City, NC 27909
| | - Jamie R. Milligan
- Department of Radiology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093
| | - Qiao Chen
- Chemistry Department, School of Life Sciences, Sussex University, Brighton, BN1 9QJ, UK
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