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TiO2 modifications by hydrothermal treatment and doping to improve its photocatalytic behaviour under visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
54961 47033 2013 7 PDF Available
Title
TiO2 modifications by hydrothermal treatment and doping to improve its photocatalytic behaviour under visible light
Abstract

Heterogeneous photocatalysis based on TiO2 materials is an interesting method for the treatment of polluted water because it allows degradation of a wide variety of organic contaminant compounds. The performance of TiO2 based photocatalysts was studied by aqueous solutions of methylene blue (MB) as a model contaminant compound by using 50 mg L−1 as initial water contaminant concentration in order to compare the photocatalytic behaviour of TiO2 Degussa P25 and some synthesized photocatalysts by hydrothermal treatment (nanostructured TiO2 and metal-doped nanostructured TiO2 photocatalysts: nanostructured Co–TiO2, nanostructured Fe–TiO2 and nanostructured Mn–TiO2) under UV and visible light irradiation. Photocatalytic materials characterization was carried out by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption–desorption, mercury porosimetry, XPS and diffuse reflectance UV–vis spectra. An improvement of the photocatalytic activity has been observed when nanostructured and doped photocatalysts were used under visible light irradiation, concluding that the hydrothermal treatment produces a nanostructuration of commercial titania by the formation of nanoparticles, which results in a large decrease of average crystallite size of undoped and doped titania, and in an important increase of BET specific area and total pore area.

Graphical abstractPhotocatalysts UV–vis light absorption.Figure optionsDownload full-size imageDownload high-quality image (141 K)Download as PowerPoint slideHighlights► TiO2 was modified as a good photocatalysts for advanced oxidation treatment. ► Nanostructures of TiO2 were achieved from hydrothermal treatment. ► Hydrothermal method produces a large decrease in the photocatalyst crystallite size. ► Metal doping improves photocatalytic activity under visible light. ► The developed photocatalyst demonstrated application in photodecontamination using solar light.

Keywords
Photocatalyst; Water decontamination; UV and visible light; Nano-TiO2; Hydrothermal method; Doping; Transition metal; Methylene blue (MB)
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TiO2 modifications by hydrothermal treatment and doping to improve its photocatalytic behaviour under visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 210, 1 July 2013, Pages 135–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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