Single-step preparation of recyclable silver nanoparticle immobilized porous glass filters for the catalytic reduction of nitroarenes

Lin, Hong-Ling; Sou, Nga-Lai; Huang, Genin Gary

doi:10.1039/c4ra16541a

Cited by 19 publications

(17 citation statements)

References 52 publications

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“…When freshly prepared NaBH 4 is added to aqueous solution of 2-or 4-nitroanilines, the yellow color of the reaction mixtures get amplified. As a result of charge transfer transition the absorption maxima in the UV-vis spectra were shifted to longer wavelengths that is 380 and 412 nm, respectively [30,31].…”

Section: Catalytic Reduction Of 4-nitrophenol To 4-nitroaniline Bymentioning

confidence: 99%

Microwave assisted green synthesis of silver nanoparticles using leaf extract of elephantopus scaber and its environmental and biological applications

Francis

Joseph²,

Koshy

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

156

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The fabrication of spherical silver nanoparticles using the phytoreducing agent Elephantopus scaber is reported here. Irradiation of the reaction mixture under a domestic microwave oven enabled the formation of stable silver nanoparticles and was confirmed by UV-vis spectral portrait. Chemical components inherent in the aqueous leaf extract which reduces the monovalent silver were identified by FT-IR spectroscopy. The crystal structure of the synthesized nanoparticles was established as face centred cube by the powder XRD analysis. The TEM images suggest an average particle size of 37.86 nm to the silver nanoparticles. The prepared silver nanocatalysts can successfully reduce various organic nitro compounds, namely, 4-nitrophenol, 2-nitroaniline and 4-nitroaniline. The environmental pollution caused by dyes like eosin Y is effectively wiped off within a short span of time using the prepared nanocatalysts. The free radical quenching efficacy of the plant extract and the silver nanoparticles were checked by employing DPPH assay bestowing ascorbic acid reference. The potential of the nanoparticles as antimicrobials against six human disease causing pathogens were tested through the well diffusion pathway. The newly developed silver nanoparticles produced IC value 15.68 ± 0.15 μg/mL on human skin carcinoma cells, A375 and 65.49 ± 0.40 μg/mL on fibroblast cells, L929 when the cytotoxicity is studied employing MTT assay. Elephantopus scaber showed IC value 50.55 ± 0.17 μg/mL against A375 cells.

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Section: Catalytic Reduction Of 4-nitrophenol To 4-nitroaniline Bymentioning

confidence: 99%

Microwave assisted green synthesis of silver nanoparticles using leaf extract of elephantopus scaber and its environmental and biological applications

Francis

Joseph²,

Koshy

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

156

View full text Add to dashboard Cite

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“…This particular property allows them to act as catalysts in various electron transfer reactions. [9][10][11][12] Hybrid catalysts integrated AgNPs with inorganic and organic supports have been successfully developed. [6][7][8] Consequently, it is desirable to explore simple and effective methods to maintain the longterm stability so as to determine the catalytic performance of AgNPs.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 Unfortunately, AgNPs tend to easily aggregate and change shape during catalytic reactions because of their high surface energy resulting from the high surface-to-volume ratio, and result in a remarkable reduction in their catalytic activity and selectivity undesirably. 9,[13][14][15][16] Polymer， especially renewable and nonhazardous biopolymer matrix as a support for metal nanocatalysts have attracted considerable attention. A classic method is immobilization or encapsulation of AgNPs on/into supporting matrix.…”

Section: Introductionmentioning

confidence: 99%

Alginate fibers embedded with silver nanoparticles as efficient catalysts for reduction of 4-nitrophenol

Zhao

et al. 2015

RSC Adv.

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Silver nanoparticles (AgNPs) have attracted much attention as promising catalysts in various electron transfer reactions due to their high catalytic efficiency. However, their poor stability results in the decrease of the catalytic efficiency and the poor cycling performance, which have hindered the practical application of AgNPs. In this work, alginate fibers embedded with AgNPs were prepared via in situ reduction of Ag + -alginate fibers in the presence of glucose. Field emission scanning electron microscopy (FE-SEM) and Transmission electron microscopy (TEM) indicated that spherical AgNPs dispersed on the surface and the interior of the fibers. The alginate fibers could enable AgNPs to be highly stabilized and thus led to the excellent reusability as heterogeneous catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in aqueous media. The catalytic results indicated that 4-NP could be reduced completely within 15 min. Moreover, the catalyst was easily recovered and reused for at least ten cycles in the reduction reactions, confirming its excellent stability. Most importantly, compared to the conventional powdery catalysts, the fiber catalyst could be handled much more conveniently for re-usage owing to its easily separation.

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“…29−31 Among these many applications, the catalysis of the reduction of nitroarenes to aromatic amines is increasingly attracting attention because of pharmaceutical needs and the importance of this industry. 25,26,32−38 Various strategies have been proposed to reduce nitroarenes more efficiently and more rapidly using silver nanomaterials. These strategies include depositing silver nanoparticles (AgNPs) on supports used as heterogeneous catalysts, 24,26,39−42 combining AgNPs with reduced graphene oxide or graphene oxide as catalysts, 43−47 and using silver nanocolloids as a quasi-homogeneous nanocatalyst.…”

Section: Introductionmentioning

confidence: 99%

“…25,26,32−38 Various strategies have been proposed to reduce nitroarenes more efficiently and more rapidly using silver nanomaterials. These strategies include depositing silver nanoparticles (AgNPs) on supports used as heterogeneous catalysts, 24,26,39−42 combining AgNPs with reduced graphene oxide or graphene oxide as catalysts, 43−47 and using silver nanocolloids as a quasi-homogeneous nanocatalyst. 25,33,48−54 All of the aforementioned catalytic approaches are efficient and selective.…”

Section: Introductionmentioning

confidence: 99%

Single-Step Preparation of Silver-Doped Magnetic Hybrid Nanoparticles for the Catalytic Reduction of Nitroarenes

Chen¹,

Hung²,

Hung³

et al. 2018

ACS Omega

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This study adopts a simple but facile process for preparing silver-doped magnetic nanoparticles by the spontaneous oxidation–reduction/coprecipitation method. The preparation can be achieved in one pot with a single step, and the prepared silver-doped magnetic nanoparticles were utilized as nanocatalysts for the reduction of o -nitroaniline. Utilizing the magnetic characteristics of the prepared nanoparticles, the catalytic reactions can be carried out under quasi-homogeneous condition and the nanocatalysts can be easily collected after the conversion is achieved. It can be revealed from the results that the morphologies and the composition of the prepared silver-doped magnetic nanoparticles can be adjusted by changing the conditions during the production, which affects the efficacy of the catalysis. In addition, the catalysis efficiency is also controlled by the pH, temperature, and the amounts of nanocatalysts used during the catalytic reaction. Finally, the silver-doped magnetic nanocatalysts prepared in this study own the advantages of easy preparation, room-temperature catalysis, high conversion ability, and recyclability, which make them more applicable in real utilities.

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Single-step preparation of recyclable silver nanoparticle immobilized porous glass filters for the catalytic reduction of nitroarenes

Abstract: A single step preparation of recyclable silver nanocatalysts for catalytic reduction of nitroarenes with high efficiency.

Cited by 19 publications

References 52 publications

Microwave assisted green synthesis of silver nanoparticles using leaf extract of elephantopus scaber and its environmental and biological applications

Microwave assisted green synthesis of silver nanoparticles using leaf extract of elephantopus scaber and its environmental and biological applications

Alginate fibers embedded with silver nanoparticles as efficient catalysts for reduction of 4-nitrophenol

Single-Step Preparation of Silver-Doped Magnetic Hybrid Nanoparticles for the Catalytic Reduction of Nitroarenes

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