95-86-3Relevant articles and documents
Synthesis of magnetic silver cyclodextrin nanocomposite as catalyst for reduction of nitro aromatics and organic dyes
Nariya, Pratik,Das, Manita,Shukla, Falguni,Thakore, Sonal
, (2020)
Nanocomposites decorated with metallic nanoparticles in their matrix are important class of heterogeneous catalyst with high catalytic activity. Functionalized polymers are low cost materials which offer excellent supports for catalysts to render stability to metallic nanoparticles. Herein we report synthesis of Silver nanocomposite using β-cyclodextrin (b-CD) maleic anhydride crosslinked polymer anchored on the surface of magnetic nanoparticles. The nanocomposite was characterized using sophisticated analytical techniques and its role as a catalyst for reduction of nitroaromatics and organic dyes was investigated. This catalytic system exhibited comparatively lower Ea value of 18 kJ mol?1 and followed pseudo first order kinetics. Simultaneous reduction of 4-Nitrophenol and Methylene Blue could be achieved in a time interval of 7 minutes. Being magnetically separable, the catalyst exhibited high recycling efficiency (up to 5 cycles) and ease of operation under mild conditions.
Synthesis of graphene quantum dots stabilized bimetallic AgRh nanoparticles and their applications
Li, Ning,Chen, Weifeng,Shen,Chen, Shaona,Liu
, (2019)
The design and synthesis of highly efficient and ultrafine bimetallic nanoparticles catalysts is challenging. Here we report the synthesis of AgRh bimetallic nanoparticles (AgRh BNPs) stabilized by graphene quantum dots (GQDs) and their exceptional catalytic activities in the reduction of 4-nitrophenol, 2,4-dinitrophenol and 4-nitrobenzene diazonium tetrafluoroborate and generation of hydroxyl radicals. Construction of AgRh BNPs nanocomposites is accomplished by mixing of GQDs and sodium borohydride, followed by the addition of simple commercial Ag and Rh salt at 0 °C in water. Among them, AgRh BNPs 4 exhibits excellent catalytic performance owing to a positive synergistic effects between the Ag and Rh atoms on GQDs, and its catalytic activity is better than those of both monometallic counterparts.
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Bradt
, p. 2711,2713 (1930)
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Chemoselective reduction of nitro and nitrile compounds using an Fe3O4-MWCNTs?PEI-Ag nanocomposite as a reusable catalyst
Ansari, Sara,Khorshidi, Alireza,Shariati, Shahab
, p. 3554 - 3565 (2020/02/04)
Multi-walled carbon nanotubes (MWNTs) were modified with carboxylic acid functional groups (MWCNTs-(COOH)n) prior to decoration with Fe3O4 nanoparticles. A further modification step by polyethyleneimine (PEI) resulted in Fe3O4-MWCNTs?PEI which provided a suitable platform for coordination and in situ reduction of silver ions to obtain an Fe3O4-MWCNTs?PEI-Ag nanocomposite with highly dispersed Ag nanoparticles. The Fe3O4-MWCNTs?PEI-Ag hybrid material was characterized by various techniques such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), and was used as an efficient catalyst for chemoselective reduction of nitroaromatic and nitrile compounds to their corresponding amines in aqueous solution at ambient temperature. Nitrofurazone, a cytotoxic antibiotic, as a non-aromatic example was also reduced selectively at the nitro group without reduction of the other functionalities in the presence of Fe3O4-MWCNTs?PEI-Ag. The catalyst was magnetically recoverable and maintained its activity for at least six cycles without considerable loss of efficiency.
