Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles

Ali K. Ilunga; Reinout Meijboom

doi:10.1016/j.molcata.2015.10.009

Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles

Ali K. Ilunga, Reinout Meijboom

Chemical Sciences

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH₂ encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics was monitored using UV/vis spectrophotometry, under pseudo-first order conditions, resulting in observed rate constants k_obs. Langmuir-Hinshelwood approach was applied to model the kinetic process. The adsorption of methylene blue on the catalyst surface is related to the type of metal nanoparticle present, and presents the rate-determining step.

Original language	English
Pages (from-to)	48-60
Number of pages	13
Journal	Journal of Molecular Catalysis A: Chemical
Volume	411
DOIs	https://doi.org/10.1016/j.molcata.2015.10.009
Publication status	Published - 1 Jan 2016

Keywords

Adsorption
Dendrimer
Gold nanoparticles
Kinetics
Langmuir-Hinshelwood
Methylene blue
Oxidation
Silver nanoparticles

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

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10.1016/j.molcata.2015.10.009

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title = "Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles",

abstract = "The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH2 encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics was monitored using UV/vis spectrophotometry, under pseudo-first order conditions, resulting in observed rate constants kobs. Langmuir-Hinshelwood approach was applied to model the kinetic process. The adsorption of methylene blue on the catalyst surface is related to the type of metal nanoparticle present, and presents the rate-determining step.",

keywords = "Adsorption, Dendrimer, Gold nanoparticles, Kinetics, Langmuir-Hinshelwood, Methylene blue, Oxidation, Silver nanoparticles",

author = "Ilunga, {Ali K.} and Reinout Meijboom",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2016",

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doi = "10.1016/j.molcata.2015.10.009",

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journal = "Journal of Molecular Catalysis A: Chemical",

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T1 - Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles

AU - Ilunga, Ali K.

AU - Meijboom, Reinout

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH2 encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics was monitored using UV/vis spectrophotometry, under pseudo-first order conditions, resulting in observed rate constants kobs. Langmuir-Hinshelwood approach was applied to model the kinetic process. The adsorption of methylene blue on the catalyst surface is related to the type of metal nanoparticle present, and presents the rate-determining step.

AB - The catalytic oxidation of methylene blue was investigated in the presence of dendrimer generation five terminated NH2 encapsulated silver (AgDENs), and gold (AuDENs) nanoparticles as catalyst. The synthesis process of encapsulated metal nanoparticles were monitored by UV/vis spectrophotometry and their average diameters determined by transmission electron microscopy analysis, respectively. The kinetics was monitored using UV/vis spectrophotometry, under pseudo-first order conditions, resulting in observed rate constants kobs. Langmuir-Hinshelwood approach was applied to model the kinetic process. The adsorption of methylene blue on the catalyst surface is related to the type of metal nanoparticle present, and presents the rate-determining step.

KW - Adsorption

KW - Dendrimer

KW - Gold nanoparticles

KW - Kinetics

KW - Langmuir-Hinshelwood

KW - Methylene blue

KW - Oxidation

KW - Silver nanoparticles

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U2 - 10.1016/j.molcata.2015.10.009

DO - 10.1016/j.molcata.2015.10.009

M3 - Article

AN - SCOPUS:84945278015

SN - 1381-1169

VL - 411

SP - 48

EP - 60

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

ER -

Catalytic oxidation of methylene blue by dendrimer encapsulated silver and gold nanoparticles

Abstract

Keywords

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