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TiO2 supported on silica nanolayers derived from vermiculite for efficient photocatalysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
54583 47016 2013 9 PDF Available
Title
TiO2 supported on silica nanolayers derived from vermiculite for efficient photocatalysis
Abstract

•A facile synthetic approach is developed for SNLs-supported TiO2 photocatalysts.•The TiO2 nanoparticles are immobilized on the external surface of SNLs.•Tri-crystalline and flat spongy-like thin layers of TiO2 are obtained.•The as-obtained composite photocatalysts exhibit excellent photocatalytic activity.

Various TiO2 composite photocatalysts were synthesized by immobilizing TiO2 nanoparticles onto the surface of silica nanolayers (SNLs) derived from vermiculite via a simple reaction between titanium hydrate and SNLs by varying Ti/SNLs ratios and using different acidic media (HCl, HNO3 and H2SO4). As-obtained composites were characterized by means of XRD, SEM and BET analytical techniques. The photocatalytic activities of photocatalysts were evaluated using methylene blue (MB) as a model pollutant in aqueous solution. It was found that the acidic media HCl and HNO3 favored the formation of tri-crystalline and flat spongy-like thin layers of TiO2 nanoparticles with large specific surface area giving excellent photocatalytic activity; while H2SO4 medium resulted in the single-phase of anatase TiO2 with ball-like aggregates on the TiO2 thin layer, giving relatively low photocatalytic activity. The excellent performance of the composites obtained using proper SNLs content and suitable acidic medium can be mainly ascribed to the mixed-phase structures with an optimum ratio and large specific surface area, as well as the facile immobilization of TiO2 on the support, which will be beneficial to their separation from water treatment system in practical application.

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Keywords
TiO2; Immobilization; Silica nanolayers; Vermiculite; Different acids; Photocatalysis
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TiO2 supported on silica nanolayers derived from vermiculite for efficient photocatalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 216, 1 November 2013, Pages 95–103
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