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Photocatalytic degradation of methyl green dye in aqueous solution over natural clay-supported ZnO–TiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
26431 43952 2016 9 PDF Available
Title
Photocatalytic degradation of methyl green dye in aqueous solution over natural clay-supported ZnO–TiO2 catalysts
Abstract

•ZnO–TiO2/clay photocatalyst prepared using natural clay.•ZnO–TiO2/clay shows higher activity than TiO2/clay in methyl green degradation.•ZnO has a promoting effect on photocatalytic activity.•Almost omplete mineralization upon 30 min UVA irradiation.

A ZnO–TiO2/clay photcatalyst was prepared using a natural Tunisian clay as support. Its activity was assayed in the photocatalytic degradation of methyl green in aqueous solutions, in the presence of UVA irradiation. The photocatalyst was synthesized using a metal organic chemical vapor deposition (MOCVD) with Ti (OPri)4 deposed on the natural Na+–clay, followed by a modified sol–gel synthesis method for introduction. The sample was then characterized by scanning electronic microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N2 adsorption, X-ray diffraction (XRD) and titration for the determination of the zero point charge (pHZPC). The activity tests showed that the photodegradation efficiency for ZnO–TiO2/clay is higher than for the TiO2/clay catalyst, clearly pointing to a promoting effect of ZnO. The influence of operational parameters such as pH, catalyst dosage, initial dye concentration, UV irradiation intensity, as well as the influence of the presence of different oxidants was evaluated. Almost complete mineralization was obtained upon 30 min of light irradiation in the presence of the ZnO–TiO2/clay catalyst.

Graphical abstractSchematic illustration of the formation of ZnO–TiO2/clay photocatalysts.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methyl green; Water treatment; Tunisian clay; TiO2; ZnO; Photodegradation; Heterogeneous photocatalyst
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Photocatalytic degradation of methyl green dye in aqueous solution over natural clay-supported ZnO–TiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 315, 15 January 2016, Pages 25–33
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