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  • 1
    Online Resource
    Online Resource
    Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles as an Efficient Nanocomposite for Catalysis Applications in Cross-Coupling Reactions
    Bulletin of Chemical Reaction Engineering and Catalysis ; 2019
    In:  Bulletin of Chemical Reaction Engineering & Catalysis Vol. 14, No. 3 ( 2019-12-01), p. 490-501
    Details
    In: Bulletin of Chemical Reaction Engineering & Catalysis, Bulletin of Chemical Reaction Engineering and Catalysis, Vol. 14, No. 3 ( 2019-12-01), p. 490-501
    Abstract: This paper reported a scientific approach adopting microwave-assisted synthesis as a synthetic route for preparing highly active palladium nanoparticles stabilized by polyvinylpyrrolidone (Pd/PVP) and supported on reduced Graphene oxide (rGO) as a highly active catalyst used for Suzuki, Heck, and Sonogashira cross coupling reactions with remarkable turnover number (6500) and turnover frequency of 78000 h-1. Pd/PVP nanoparticles supported on reduced Graphene oxide nanosheets (Pd-PVP/rGO) showed an outstanding performance through high catalytic activity towards cross coupling reactions. A simple, reproducible, and reliable method was used to prepare this efficient catalyst using microwave irradiation synthetic conditions. The synthesis approach requires simultaneous reduction of palladium and in the presence of Gaphene oxide (GO) nanosheets using ethylene glycol as a solvent and also as a strong reducing agent. The highly active and recyclable catalyst has so many advantages including the use of mild reaction conditions, short reaction times in an environmentally benign solvent system. Moreover, the prepared catalyst could be recycled for up to five times with nearly the same high catalytic activity. Furthermore, the high catalytic activity and recyclability of the prepared catalyst are due to the strong catalyst-support interaction. The defect sites in the reduced Graphene oxide (rGO) act as nucleation centers that enable anchoring of both Pd/PVP nanoparticles and hence, minimize the possibility of agglomeration which leads to a severe decrease in the catalytic activity. 
    Type of Medium: Online Resource
    ISSN: 1978-2993
    URL: Article
    DOI: 10.9767/bcrec.14.3.3461.490-501
    Language: English
    Publisher: Bulletin of Chemical Reaction Engineering and Catalysis
    Publication Date: 2019
    detail.hit.zdb_id: 2508012-X
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  • 2
    Online Resource
    Online Resource
    REMOVAL OF METHYLENE BLUE BY ABSORPTION OF WATER HYACINTH-DERIVED ACTIVATED CARBON EMBEDDED WITH NICKEL NANOPARTICLES
    Southwest Jiaotong University ; 2021
    In:  Journal of Southwest Jiaotong University Vol. 56, No. 5 ( 2021-10-30), p. 167-178
    Details
    In: Journal of Southwest Jiaotong University, Southwest Jiaotong University, Vol. 56, No. 5 ( 2021-10-30), p. 167-178
    Abstract: Nanoparticles have proven their dominance in many fields of research in this era. Such dominance resulted from outstanding physical and chemical properties amongst other materials, led to a wide focus from different researchers in various fields to further investigate the role of nanoparticles in various applications from drug delivery systems in medicine to catalysis in chemistry. In this research, active carbon-based catalyst synthesis and characterization were investigated for different applications in catalysis as the catalyst was combined with nickel oxides to be used in dye removal of methylene blue (MB). Water hyacinth is a floating perennial aquatic plant native to tropical and sub-tropical South America. The water hyacinth is one of the fastest-growing plants; it reproduces by way of runners or stolon. Each one can produce thousands of seeds each year, which can survive for more than 28 years. It has been considered as a water purifier and a solution to green water issues. Water hyacinth is used in perfume and cologne products, as well as organic fertilizer. It also absorbs lead, mercury, and carcinogens when used for remediation purposes. As it has amazing biomass, it can be used to produce fuels. Activated carbon, also known as activated charcoal, is a carbonaceous, highly porous absorptive medium of a complex structure composed of carbon atoms. It is used in gas purification, gold purification, metal extraction, medicine, sewage treatment, air filters, in gas masks used to purify liquids in many applications, including drinking water and odor removal. This research aims to prepare active carbon derived from water hyacinth and embedded with nickel nanoparticles. The water hyacinth will be converted into active carbon and used as a support for nickel nanoparticles. A comparison between active carbon derived from water hyacinth and activated nickel nanoparticles will be conducted to test the rate of absorbance based on the effect of time, concentration, and kinetic energy.
    Type of Medium: Online Resource
    ISSN: 0258-2724
    URL: Issue
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.35741/issn.0258-2724.56
    DOI: 10.35741/issn.0258-2724.56.5
    DOI: 10.35741/issn.0258-2724
    DOI: 10.35741/issn.0258-2724.56.5.16
    Language: English
    Publisher: Southwest Jiaotong University
    Publication Date: 2021
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    METHYLENE BLUE REMOVAL THROUGH ADSORPTION OF WATER HYACINTH USING COBALT NANOPARTICLES SUPPORTED ON ACTIVE CARBON
    Southwest Jiaotong University ; 2021
    In:  Journal of Southwest Jiaotong University Vol. 56, No. 5 ( 2021-10-30), p. 156-166
    Details
    In: Journal of Southwest Jiaotong University, Southwest Jiaotong University, Vol. 56, No. 5 ( 2021-10-30), p. 156-166
    Abstract: In this research, active carbon-based catalyst synthesis and characterization were investigated for different applications in catalysis. The active carbon-based catalyst was combined with metal oxides to dye methylene blue (MB) removal. Water hyacinth is one of the major problems that facing society and especially in Egypt. One of the implications of industrial activities is environmental pollution. One of the major pollutants is dyes that are used in the production of textiles, paper, and clothes. The waste of those dyes discharged into water supplies without treatment, or ineffective treatment will harmfully impact the environment. In this research, the treatment is implemented using active carbon-based catalysts using embedded nanoparticles. That will lead to a huge increase in the surface area of the adsorbent to increase the adsorbent efficiency. The activated carbon was derived from water hyacinths that grow in the Nile River. Water hyacinth has many good uses as it can absorb heavy metals like lead and dyes. Water hyacinth was converted into activated carbon through carbonization. Different dyes were used with different contact times in fixed conditions.
    Type of Medium: Online Resource
    ISSN: 0258-2724
    URL: Issue
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.35741/issn.0258-2724.56
    DOI: 10.35741/issn.0258-2724.56.5
    DOI: 10.35741/issn.0258-2724
    DOI: 10.35741/issn.0258-2724.56.5.15
    Language: English
    Publisher: Southwest Jiaotong University
    Publication Date: 2021
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Facile Microwave-Assisted Synthetic Approach to Palladium Nanoparticles Supported on Copper Oxide as an Efficient Catalyst for Heck and Sonogashira Cross-Coupling Reactions
    World Scientific Pub Co Pte Ltd ; 2019
    In:  International Journal of Nanoscience Vol. 18, No. 05 ( 2019-10), p. 1850032-
    Details
    In: International Journal of Nanoscience, World Scientific Pub Co Pte Ltd, Vol. 18, No. 05 ( 2019-10), p. 1850032-
    Abstract: A simple green one-step method for the synthesis of highly active palladium nanoparticles embedded on copper oxide as an efficient catalyst for ligand-free Heck and Sonogashira cross-coupling reactions has been developed. The synthetic approach is based on Microwave (MW)-assisted simultaneous chemical reduction of an aqueous solution of palladium and copper salts using hydrazine hydrate as the reducing agent. Selected characterization of the catalyst with transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction spectroscopy (XRD) reveal a size range of 25[Formula: see text][Formula: see text] [Formula: see text]2[Formula: see text] nm for the generated catalyst nanoparticles with the highest catalytic activity. The use of the generated Pd/CuO nanoparticles is highly advantageous due to the use of ethanol/water as an environmentally green solvent under mild reaction conditions. Furthermore, the synthesized Pd/CuO nanoparticles catalyst can be recycled and re-used up to five times with negligible effect on the efficiency having turnover number up to 6000 and turnover frequency reaching 72[Formula: see text]000[Formula: see text] h[Formula: see text] for 20[Formula: see text] wt.% Pd loaded catalyst at 150 ∘ C.
    Type of Medium: Online Resource
    ISSN: 0219-581X , 1793-5350
    URL: Article
    DOI: 10.1142/S0219581X18500321
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2019
    SSG: 11
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