Catalytic reduction of 4-nitrophenol by magnetically recoverable Au nanocatalyst

Chang, Yang; Chen, Dong-Hwang

doi:10.1016/j.jhazmat.2008.10.034

Cited by 497 publications

(159 citation statements)

References 46 publications

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“…10.020 0926-3373/© 2016 Elsevier B.V. All rights reserved. [19,20] and chemical reduction [21,22] have been reported for removing nitrophenols from contaminated water. Among these techniques, the chemical reduction of nitrophenols seems to be most efficient way to remove nitrophenols from waste contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Karakaş

Çelebioğlu

Çelebı

et al. 2017

Applied Catalysis B: Environmental

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a b s t r a c tToday, the reduction of nitro aromatics stands a major challenge because of the pollutant and detrimental nature of these compounds. In the present study, we show that nickel(0) nanoparticles (Ni-NP) decorated on electrospun polymeric (polycaprolactone(PCL)/chitosan) nanofibers (Ni-NP/ENF) effectively catalyze the reduction of various nitrophenols (2-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophenol) under mild conditions. Ni-NP/ENF nanocatalyst was reproducibly prepared by deposition-reduction technique. The detailed characterization of these Ni-NP/ENF based nanocatalyst have been performed by using various spectroscopic tools including ICP-OES, P-XRD, XPS, SEM, BFTEM, HRTEM and BFTEM-EDX techniques. The results revealed the formation of well-dispersed nickel(0) NP (d mean = 2.71-2.93 nm) on the surface of electrospun polymeric nanofibers. The catalytic activity of the resulting Ni-NP/ENF was evaluated in the catalytic reduction of nitrophenols in aqueous solution in the presence of sodium borohydride (NaBH 4 ) as reducing agent, in which Ni-NP/ENF nanocatalyst has shown high activity (TOF = 46.2 mol 2-nitrophenol/mol Ni min; 48.2 mol 2,4-dinitrophenol/mol Ni min; 65.6 mol 2,4,6-trinitrophenol/mol Ni min). More importantly, due to the nanofibrous polymeric support, Ni-NP/ENF has shown a flexible characteristics along with reusability property. Testing the catalytic stability of Ni-NP/ENF revealed that this new catalytic material provides high reusability performance (at 3rd reuse 86% for 2-nitrophenol, 83% 2,4-dinitrophenol and 82% 2,4,6-trinitrophenol) for the reduction of nitrophenols even at room temperature and under air. The present study reported here also includes the compilation of wealthy kinetic data for Ni-NP/ENF catalyzed the reduction of nitrophenols in aqueous sodium borohydride solution depending on temperature and type of support material (Al 2 O 3 , C, SiO 2 ) to understand the effect of the support material and determine the activation parameters.

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Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Karakaş

Çelebioğlu

Çelebı

et al. 2017

Applied Catalysis B: Environmental

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“…There is no observed change in absorbance with time after the addition of NaBH 4 , suggesting that the reduction does not occur in the absence of catalyst. The adding of the gold nanoparticles causes visually progressive fading of the reaction medium which results in a decrease in the absorbance peak at 400 nm and the appearance of two new peaks at 277 nm and 310 nm characteristic of the presence of 4-aminophenol, and the absorbance increases with time [12,13,18,19]. The reaction is considered complete when the absorbance of the characteristic peak of 4-nitrophenol and is constant near 0.…”

Section: Catalytic Activity Of Gold Nanoparticlesmentioning

confidence: 99%

“…The 4-NP is highly stable in water and takes a long time to degrade and also causing environmental risk by exhibiting carcinogenic activities [11,12]. Many methods have been developed for the removal of nitrophenols including adsorption, microbial degradation, photocatalytic degradation, electro-Fenton method, microwave assisted degradation and so on [13].…”

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confidence: 99%

Radiation Synthesis and Characterization of Chitosan Stabilized Gold Nanoparticles and Catalytic Activity Study

Vo¹

2018

JST

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In this paper, gold nanoparticles (AuNPs) were synthesized in a single and efficient procedure by e-beam and γ-irradiation using chitosan as a stabilizing agent. The investigations on synthesis of AuNPs under ionizing radiation by studying the influence of initial conditions of the preparation of Au(III)-chitosan solutions prior to irradiation on the nucleation process and on the morphological characteristic of the formed nanoparticles. The results of UV-vis absorption spectroscopy, transmission electron microscopy indicated that spherical welldispersed gold nanoparticles ranging from 5 to 10 nm were elaborated, depending on the irradiation dose, the dose rate and the [GLA]/[Au(III)] ratio (GLA: glucosamine units). Furthermore, we also reported the application of the synthesized gold nanoparticles as catalyst in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by excess sodium borohydride.

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“…Previous studies also reported the possibility of a prepared gold nano-catalyst undergoing undesired agglomeration and precipitation before and after reactions [43]. Thus, the design of an active and selective gold-based catalyst is intended to invent an appropriate support in terms of its gold affinity, stabilization ability and large surface area [42,44].…”

Section: Gold Catalystmentioning

confidence: 99%

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

2015

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Chitosan, a bio-based polymer which has similar characteristics to those of cellulose, exhibits cationic behavior in acidic solutions and strong affinity for metals ions. Thus, it has received increased attention for the preparation of heterogeneous catalysts. Recent studies demonstrated that chitosan-based catalysts had high sorption capacities, chelating activities, stability and versatility, which could be potentially applied as green reactants in various scientific and engineering applications. This study intends to review the recent development of chitosan-based catalysts, particularly in the aspects of the main mechanisms for preparing the materials and their applications in environmental green chemistry. Studies on the preparation of catalyst nanoparticles/nanospheres supported on chitosan were also reviewed.

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Catalytic reduction of 4-nitrophenol by magnetically recoverable Au nanocatalyst

Cited by 497 publications

References 46 publications

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Nickel nanoparticles decorated on electrospun polycaprolactone/chitosan nanofibers as flexible, highly active and reusable nanocatalyst in the reduction of nitrophenols under mild conditions

Radiation Synthesis and Characterization of Chitosan Stabilized Gold Nanoparticles and Catalytic Activity Study

Chitosan as a Natural Polymer for Heterogeneous Catalysts Support: A Short Review on Its Applications

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