Synthesis of silver nanoshell-coated cationic polystyrene beads: A solid phase catalyst for the reduction of 4-nitrophenol

Jana, Subhra; Ghosh, Sujit Kumar; Nath, Sankar Kumar; Pande, Surojit; Praharaj, Snigdhamayee; Panigrahi, Sudipa; Basu, Soumen; Endo, Takeshi; Pal, Tarasankar

doi:10.1016/j.apcata.2006.07.007

Cited by 282 publications

(164 citation statements)

References 35 publications

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“…After the addition of NaBH 4 solution, the absorption maximum shifts to 400 nm (b) due to the formation of the 4-nitrophenolate in the alkaline condition, with a color change from light yellow to bright yellow. Moreover, the maximum absorption is no change over times after adding superfluous NaBH 4 solution, which confirms that the reduction reaction does not proceed by aqueous NaBH 4 solution (29).…”

Section: Resultssupporting

confidence: 62%

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Catalytic performance in 4-nitrophenol reduction by Ag nanoparticles stabilized on biodegradable amphiphilic copolymers

Safari

Najafabadi

Zarnegar

et al. 2016

Green Chemistry Letters and Reviews

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Biodegradable copolymers have received much more attention in the last decades due their potential applications in the fields related to environmental protection, medicine, agriculture, and the chemical processes. Silver nanoparticles (Ag NPs) were prepared via reduction of silver nitrate (AgNO 3 ) using biodegradable amphiphilic copolymers in aqueous solution. The micelles were constructed from the amphiphilic copolymer composed of poly(2-ethyl-2-oxazoline) and poly(ε-caprolactone). The Ag NPs with a diameter of 10-15 nm were found to show a comparable high catalytic activity toward the reduction of 4-nitrophenol (4-NP) in the presence of an excess amount of NaBH 4 . The synthesized Ag NPs-loaded copolymer exhibits high catalytic activity for the reduction of 4-NP to 4-aminophenol.ARTICLE HISTORY

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Section: Resultssupporting

confidence: 62%

“…Because there is only one product, 4-aminophenol, and the extent of reaction can be followed by measuring the change in UV/Vis absorbance at 400 and 300 nm (29,30). For comparison, in the absence of Ag NPs, first, 0.005 mol/L 4-NP solution was prepared and monitored for the change of absorption.…”

Section: Resultsmentioning

confidence: 99%

Catalytic performance in 4-nitrophenol reduction by Ag nanoparticles stabilized on biodegradable amphiphilic copolymers

Safari

Najafabadi

Zarnegar

et al. 2016

Green Chemistry Letters and Reviews

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show abstract

“…[1,2] Metallic nanoparticles have interesting perspectives in the applications as catalysts, [3][4][5] sensors, [6,7] and electronics. For all practical applications, however, the metallic nanoparticles must be stabilized in solution in order to prevent flocculation of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Structures Generated by Spherical Polyelectrolyte Brushes and their Application in Catalysis

Lü

Wittemann

Ballauff

2009

Macromol. Rapid Commun.

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We survey recent studies on composite particles made from spherical polyelectrolyte brushes (SPB) and catalytically active nanoparticles or enzymes. SPB consist of a solid core (diameter: ca. 100 nm) onto which long chains of anionic or cationic polyelectrolyte (PE) are densely grafted ("PE brush"). Immersed in water the PE layer affixed to the colloidal core will swell due to the enormous osmotic pressure of the confined counterions ("osmotic brush"). This confinement of the counterions can be used to generate metal nanoparticles on the surface of the SPB. Moreover, enzymes can be immobilized within the PE layer. In both cases, the resulting composite particles are stable against coagulation and can be easily handled and filtered off. The catalytic activity of both systems is largely preserved in case of the enzymes, in case of the metal nanoparticles it is even enhanced. Thus, the SPB present an excellent carrier system for applications in catalysis.

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“…The reduction could be visualized as the peak at 400 nm was vanishing with the concomitant appearance of a new peak at 295 nm, which substantiated the formation of 4-AP. [35][36][37] Absorbance versus time were plotted for the reduction of 4-NP by Ag NPs with di®erent kollicoat Fig. 13.…”

Section: Catalytic Reactionsmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles with Exceptional Colloidal Stability and its Catalytic Activity Toward Nitrophenol Reduction

Sharma

Mishra

Kumar³

et al. 2016

NANO

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Silver nanoparticles (Ag NPs) were synthesized by one-step process in the presence of kollicoat as capping, reducing and stabilizing mediator. The synthesized NPs were characterized by using FTIR, TEM, DLS, XRD, EDS and UV-Vis spectroscopy. The resulting Ag NPs had an incomparable colloidal stability against the salt addition and change of pH. The e®ect of di®erent synthesis parameters and the catalytic property of the NPs were examined.

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Synthesis of silver nanoshell-coated cationic polystyrene beads: A solid phase catalyst for the reduction of 4-nitrophenol

Cited by 282 publications

References 35 publications

Catalytic performance in 4-nitrophenol reduction by Ag nanoparticles stabilized on biodegradable amphiphilic copolymers

Catalytic performance in 4-nitrophenol reduction by Ag nanoparticles stabilized on biodegradable amphiphilic copolymers

Supramolecular Structures Generated by Spherical Polyelectrolyte Brushes and their Application in Catalysis

Green Synthesis of Silver Nanoparticles with Exceptional Colloidal Stability and its Catalytic Activity Toward Nitrophenol Reduction

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