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Preparation of Ag/ZnMgO nanocomposites as novel highly efficient photocatalysts by one-pot method under microwave irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
25958 43924 2014 9 PDF Available
Title
Preparation of Ag/ZnMgO nanocomposites as novel highly efficient photocatalysts by one-pot method under microwave irradiation
Abstract

•Nanocomposites of Ag/ZnMgO were prepared by one-pot method under microwave irradiation for 5 min.•Activity of the nanocomposites for degradation of methylene blue was evaluated under UV irradiation.•The rate constant on Ag (3.4 wt%)/ZnMgO nanocomposite is about 11-fold greater than that of ZnO nanostructures.•In the nanocomposite the charge carriers easily transfer to surface to participate in degradation reactions.•The degradation rate constant increases with weight of glucose as reducing agent up to 0.3 g.

A series of Ag/Zn0.85Mg0.15O (Ag/ZnMgO) nanocomposites with different contents of metallic silver (0.85, 1.7, 3.4, and 6.7 wt%) were prepared in water using a one-pot method under microwave irradiation for 5 min. This large-scale method is fast and does not use any post preparation treatments. The X-ray diffraction (XRD) patterns have peaks corresponding to wurtzite hexagonal crystalline ZnO and cubic Ag. Purity and composition of the prepared samples were verified by energy dispersive X-ray (EDX). The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that morphology of the samples changes by adding silver element. The diffuse reflectance spectroscopy (DRS) studies demonstrate that by increasing the amount of Ag, the absorption in the visible range increases. Electrochemical impedance spectroscopy (EIS) data show that in the presence of magnesium and silver elements, interfacial charge transfer resistance decreases relative to ZnO nanostructures. Activity of the nanocomposites for degradation of methylene blue was evaluated under UV irradiation. The degradation rate constant on Ag (3.4 wt%)/ZnMgO nanocomposite is about 11.2, 4.7 and 9.6-fold greater than those of ZnO, ZnMgO and Ag (3.4 wt%)/ZnO photocatalysts, respectively. In addition, influence of various operational parameters on the degradation rate constant was investigated and the results were discussed.

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Keywords
Ag/ZnMgO; Ag/ZnO; Nanocomposite; Photocatalysis
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Preparation of Ag/ZnMgO nanocomposites as novel highly efficient photocatalysts by one-pot method under microwave irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 281, 1 May 2014, Pages 59–67
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us