Synthesis of ZnO/Au and ZnO/Ag nanoparticles and their photocatalytic application using UV and visible light

Fageria, Pragati; Gangopadhyay, S.; Pande, Surojit

doi:10.1039/c4ra03158j

Cited by 411 publications

(207 citation statements)

References 57 publications

Supporting

Mentioning

170

Contrasting

Unclassified

Order By: Relevance

“…Then the absorbed O 2 and H 2 O on the surface of the Ag/ZnO composites would react with the photogenerated electrons to form superoxide radical anions such as ·O 2 -, ·HO 2 , and ·OH. The photoinduced holes are inclined to interact with OH -or H 2 O to further generate ·OH species, which has a strong oxidizability to decompose most of the pollutants [43][44].…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Wu¹,

Jian²,

Dang³

et al. 2017

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Wu¹,

Jian²,

Dang³

et al. 2017

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

“…30 The augment in the efficiency of TiO 2 such as to entrap the charge carrier is achieved by doping with transition metals such as silver (Ag), copper (Cu), ruthenium (Ru) etc.. [31][32][33] Actually, on the semiconductor surface, dopants act as an electron sink which diminishes the electron-hole pair recombination. [34][35][36][37] In this work, ruthenium was utilized as a dopant for TiO 2 based nanoparticles to boost the area of the sensing surface, to reduce the recombination of the photogenerated e − and H + and in the visible light region to extend the absorption of light. 38 From the literature survey, we found that there is a gap in FFA determination in trace quantity.…”

mentioning

confidence: 99%

Electrochemical Sensor Based upon Ruthenium Doped TiO₂Nanoparticles for the Determination of Flufenamic Acid

Shetti

Nayak

Malode

et al. 2016

J. Electrochem. Soc.

103

View full text Add to dashboard Cite

In the current research, ruthenium stood a conspicuous dopant for TiO 2 nanoparticles, to enhance its catalytic activity. The characterization of synthesized nanoparticles was accomplished by utilizing XRD, SEM, EDX and TEM analysis. The sensing surface morphology was studied by AFM analysis. Further, we established the electrochemical behavior and detection of flufenamic acid (FFA) by utilizing ruthenium doped TiO 2 nanoparticles modified carbon paste electrode (Ru-TiO 2 /CPE) at pH 6.0 by employing different voltammetric techniques. Modification enhances the electro-oxidation of flufenamic acid with increased current intensity. The influence of parameters like scan rate, pH, accumulation time, amount of the modifier and concentration on the peak current of the drug were studied. The effect of FFA concentration variation was studied using square wave voltammetric (SWV) technique and got lowest detection limit compared to reported techniques. The fabricated sensor was employed for the determination of flufenamic acid in biological samples. Flufenamic acid (FFA), N-(α,α,α-trifluoro-m-tolyl) an anthranilic acid derivative (Scheme 1), is an effective analgesic, an antiinflammatory and antipyretic agent used for the relief of pain and inflammation associated with musculoskeletal and joint disorders, peri-articular and soft tissue disorders, antirheumatic therapy.1,2 Monitoring of therapeutic drug habitually necessitates its detection in biological fluids.Many analytical methods based on different principles, such as spectrophotometry, 3-6 spectrofluorimetry, 5,11 fluorescence spectrometry, 7-10 flow injection analysis, 11,12 chromatography [13][14][15] have been developed for the analysis of flufenamic acid along with its derivatives. Capillary electrophoresis [16][17][18] is an alternative methodology for the separation and detection of FFA. However, these methods are well-demonstrated and broadly accepted, but they require moderately costly equipment, laborious sample pretreatment, specialized expertise, high cost and are time-consuming which make them unsuitable for routine analysis. Few voltammetric studies 5,19 were also carried out by utilizing cyclic voltammetry and adsorptive voltammetry. Though, these sensors suffer from the less sensitive, poor long-term stability, lack of surface renewability, etc.As of late, research developed, aiming at the construction and the characterization of the electrodes composed of carbonaceous materials because of their rich surface chemistry, lower background current, wider potential window, uncomplicated surface renewal and low detection limit properties. [20][21][22][23][24] The fabrication of the working electrode with nanoparticles enhances peak current, sensitivity, reproducibility. 25,26 In current science and technology, one of the crucial uniqueness is to survey and to discover the new efficient materials as electrode surface modifiers.In general, new types of sensor devices are the outcome of the synthesis and preparation of innovative modifiers. In this regard, as e...

show abstract

“…2,5 Thus, Au-ZnO hybrid nanoarchitectures and Ag-ZnO heterostructures are found to be efficient photocatalysts than the ZnO constituent alone. [6][7][8][9][10][11] Photoluminescence studies and Kelvin probe microscopy uphold facile photoelectron transfer from ZnO to metal. 6,12 ZnO-carbon nanofibre heterostructures also exhibit higher photocatalytic rates with the evidence of charge transfer.…”

Section: Introductionmentioning

confidence: 99%

“…13 A further advantage of introducing defect states and metal nanoparticles is the extension of absorption characteristics in the visible region enabling the more economical visible light driven photocatalysis. 7,14,15 With the advent of 2D graphene, there have been several reports on the efficiency of ZnO hybrids with graphene or reduced graphene oxide (rGO) for the photocatalytic degradation of organic molecules. 15,16 This is facilitated by the excited state electron transfer from ZnO to graphene.…”

Section: Introductionmentioning

confidence: 99%

Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Bramhaiah

Singh

John

2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

a Binary and ternary hybrid systems of ZnO possessing nanoparticle and nanorod morphologies on reduced graphene oxide (rGO) and rGO with Au nanoparticles are explored as photocatalysts and a comparative study of their photodegradation performance is presented. Various preparation methods such as solution phase and hydrothermal routes have been employed to produce rGO-ZnO hybrids and rGO-Au-ZnO hybrids to impart different morphologies and defect states in ZnO. All the hybrids exhibit faster photodegradation kinetics and the rGO-Au-ZnO system exhibits the highest rate, five times faster than bare ZnO, followed by the binary systems, rGO-ZnO nanoparticles and nanorods. Various factors such as structure, morphology, charge transfer and adsorption are considered to explain the observed kinetics. Excited state electron transfer from ZnO to both rGO and Au levels facilitates faster dye degradation for rGO-Au-ZnO and is reflected as highly quenched band edge and defect state photoluminescence.Intimate physical interfaces formed between rGO, Au and ZnO in the hybrid material during in situ reactions favour charge transfer across the components. The charge transfer contribution even dominates the adsorption factor and the rGO-Au-ZnO system with a slightly lower adsorption capacity than the rGO-ZnO system exhibits a higher degradation rate. A power law dependence of the photodegradation rate on light intensity is also expressed.

show abstract

Synthesis of ZnO/Au and ZnO/Ag nanoparticles and their photocatalytic application using UV and visible light

Abstract: A simple approach for the deposition of Au and Ag nanoparticles on ZnO surface and to investigate their application in pollutant degradation.

Cited by 411 publications

References 57 publications

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Electrochemical Sensor Based upon Ruthenium Doped TiO₂Nanoparticles for the Determination of Flufenamic Acid

Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Contact Info

Product

Resources

About

Synthesis of ZnO/Au and ZnO/Ag nanoparticles and their photocatalytic application using UV and visible light

Abstract: A simple approach for the deposition of Au and Ag nanoparticles on ZnO surface and to investigate their application in pollutant degradation.

Cited by 411 publications

References 57 publications

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Electrochemical Sensor Based upon Ruthenium Doped TiO2Nanoparticles for the Determination of Flufenamic Acid

Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

Contact Info

Product

Resources

About

Electrochemical Sensor Based upon Ruthenium Doped TiO₂Nanoparticles for the Determination of Flufenamic Acid