Encapsulation of silver nanoparticles into graphite grafted with hyperbranched poly(amidoamine) dendrimer and their catalytic activity towards reduction of nitro aromatics

Rajesh, Rajendiran; Venkatesan, R.

doi:10.1016/j.molcata.2012.04.001

Cited by 83 publications

(25 citation statements)

References 44 publications

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“…In the field of nanosilver-catalyzed reduction of nitroaromatic compounds, Venkatesan and Rajesh have ever prepared a graphite-grafted-hyperbranched polyamidoamine (PAMAM) dendrimer supported silver nanoparticles for reduction of nitroaromatic compounds. 30 The nanosilver catalyst system also exhibited moderate to excellent yields for various nitroaromatic compounds (61-100% yields). One-pot transformation of nitroaromatic compounds to synthetically useful molecules via reduction and subsequent reaction is expected to be an interesting topic in organic synthesis.…”

Section: Reduction Of Nitroaromaticsmentioning

confidence: 95%

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Dong

Gao

Yang

et al. 2015

Catal. Sci. Technol.

293

147

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Among the metal-based nanoparticles, silver nanoparticles catalysis has been of great interest in organic synthesis and has expanded rapidly in the past ten years because of nanosilver catalysts' unique reactivity and selectivity, stability, as well as recyclability in catalytic reactions. As can be seen from the research results reported in this critical review, the application of heterogeneous silver-based nanoparticles to general organic reactions has proved to be an effective strategy in the development of highly efficient organic transformations in term of efficiency and selectivity. In particular, this review revealed the powerful potential of nanosilver catalysis in total synthesis of natural products and pharmaceutical molecules.

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Section: Reduction Of Nitroaromaticsmentioning

confidence: 95%

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Dong

Gao

Yang

et al. 2015

Catal. Sci. Technol.

293

147

View full text Add to dashboard Cite

show abstract

“…5 b). This peak was remained unaltered over time (examined for ~ 24 h), which suggests that the reaction does not proceed without a catalyst [52][53][54]. Subsequently, the reduction of 4-NP by NaBH4 over the prepared catalysts (1wt.…”

Section: Xps Analysismentioning

confidence: 98%

“…This peak was remained unaltered over time (examined for approx. 24 h), which suggests that the reaction does not proceed without a catalyst [52][53][54]. Subsequently, the reduction of 4-NP by NaBH 4 over the prepared catalysts (1 wt% Au/TiO 2 as an example) was then monitored by measuring the changes in the absorbance at 400 nm as a function of time and emerging of a new peak at approximately 300 nm for the product formation, 4-AP ( figure 5c).…”

Section: (D) Catalytic Activity Of Au X Pd 1−x /Tio 2 Catalystsmentioning

confidence: 99%

Optimization of sol-immobilized bimetallic Au–Pd/TiO ₂ catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation

Alshammari

Niu

Palmer

et al. 2020

Phil. Trans. R. Soc. A.

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A sol-immobilization method is used to synthesize a series of highly active and stable Au x Pd 1− x /TiO 2 catalysts (where x = 0, 0.13, 0.25, 0.5, 0.75, 0.87 and 1) for wastewater remediation. The catalytic performance of the materials was evaluated for the catalytic reduction of 4-nitrophenol, a model wastewater contaminant, using NaBH 4 as the reducing agent under mild reaction conditions. Reaction parameters such as substrate/metal and substrate/reducing agent molar ratios, reaction temperature and stirring rate were investigated. Structure-activity correlations were studied using a number of complementary techniques including X-ray powder diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. The sol-immobilization route provides very small Au–Pd alloyed nanoparticles, with the highest catalytic performance shown by the Au 0.5 Pd 0.5 /TiO 2 catalyst. This article is part of a discussion meeting issue ‘Science to enable the circular economy’.

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“…In a word, the CFs-G 0.5 -PAMAM could be confirmed by the appearance of C-N stretch at 1520 cm À1 , primarily -N-C¼O peak at 1630 cm À1 and ester groups peak at 1740 cm À1 . 26,27 TG was also carried out to confirm the grafted content on the CF surface by measuring the weight loss from 100 C to 600 C (Figure 4). 11,28 The weight loss of the CFs-NH 2 was mainly attributed to functional groups of EDA (-NH 2 ) and the weight decreased by 0.5%.…”

Section: Surface Chemical Compositionmentioning

confidence: 99%

Effects of grafting low-generation poly(amido amine) onto carbon fiber surface by in situ polymerization on the mechanical properties of fiber composites

Gao

et al. 2016

High Performance Polymers

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Low-generation poly(amido amine) (PAMAM)-grafted carbon fibers (CFs) emerged as a new reinforcement for improving the mechanical properties of fiber composites. In this work, hybrid reinforcement, which could greatly enhance the surface roughness and wettability of CF, was prepared via growing PAMAM onto fiber surface by in situ polymerization.The modified surface morphology and chemical composition were investigated by scanning electron microscopy, atomic force microscopy, dynamic contact angle analysis test, and X-ray photoelectron spectroscopy. Experimental results indicated PAMAM dendrimers grown on the CF significantly enhanced interfacial properties of the resulting composites. In addition, compared with the desized CF composites, the CF grafted with PAMAM composites exhibited 34.65% enhancement in the interfacial shear strength.

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Encapsulation of silver nanoparticles into graphite grafted with hyperbranched poly(amidoamine) dendrimer and their catalytic activity towards reduction of nitro aromatics

Cited by 83 publications

References 44 publications

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Optimization of sol-immobilized bimetallic Au–Pd/TiO ₂ catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation

Effects of grafting low-generation poly(amido amine) onto carbon fiber surface by in situ polymerization on the mechanical properties of fiber composites

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Encapsulation of silver nanoparticles into graphite grafted with hyperbranched poly(amidoamine) dendrimer and their catalytic activity towards reduction of nitro aromatics

Cited by 83 publications

References 44 publications

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Optimization of sol-immobilized bimetallic Au–Pd/TiO 2 catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation

Effects of grafting low-generation poly(amido amine) onto carbon fiber surface by in situ polymerization on the mechanical properties of fiber composites

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Optimization of sol-immobilized bimetallic Au–Pd/TiO ₂ catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation