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Visible-light-absorbing mesoporous TiO2 modified with tungstosilicic acid as photocatalyst in the photodegradation of 4-chlorophenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
26561 43963 2014 9 PDF Available
Title
Visible-light-absorbing mesoporous TiO2 modified with tungstosilicic acid as photocatalyst in the photodegradation of 4-chlorophenol
Abstract

•TiO2–TSA materials with visible light absorption were synthesized by sol–gel method.•Visible light absorption could be related with TSA–TiO2 complex formation.•High photocatalytic activity of TSA–TiO2 was observed under UV + visible irradiation.•TSA–TiO2 powders were reused showing a slight decreasing of photocatalytic activity.

Visible-light-absorbing materials based on TiO2 modified with tungstosilicic acid (TSA; H4SiW12O40) were prepared using titanium isopropoxide as precursor and urea as a low-cost pore-forming agent. X-ray diffraction (XRD) measurements show evidence about the presence of anatase TiO2 in all samples and shifting of the anatase–rutile transition temperature toward temperatures higher than 600 °C. The FT-IR and FT-Raman studies showed that the main heteropolyoxometallate species present in the composites annealed up to 500 °C is the [SiW12O40]4− anion, which exhibited a strong interaction with TiO2 surface probably due to the formation of TSA–TiO2 complexes that should be responsible for its visible light absorption. The photocatalytic activity of these materials was tested using 4-chlorophenol as model pollutant. Results revealed that photocatalytic activity mainly depends on the TSA amount and the annealing temperature. The amount of degraded 4-CP increased with the increment of TSA content, with the one calcined at 600 °C being more active. Finally, it was found that these photocatalysts can be reused at least three times without an important decrease in the degradation and mineralization degrees.

Graphical abstractSynthesis of TiO2 materials modified by tungstosilicic acid (TSA) led to visible light absorption and high photocatlytic activity. Photocatalytic activity depends mainly of annealing temperature, crystialinity and TSA content.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mesoporous titania; Tungstosilicic acid; 4-Chlorophenol; Photocatalytic degradation
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Visible-light-absorbing mesoporous TiO2 modified with tungstosilicic acid as photocatalyst in the photodegradation of 4-chlorophenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 289, 1 September 2014, Pages 22–30
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