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Role of oxygen functionalities on the synthesis of photocatalytically active graphene–TiO2 composites

Paper ID Volume ID Publish Year Pages File Format Full-Text
45887 46426 2014 12 PDF Available
Title
Role of oxygen functionalities on the synthesis of photocatalytically active graphene–TiO2 composites
Abstract

•GO was treated considering environmentally friendly reducing agents.•Chemical reduction involves mainly epoxy and hydroxyl groups.•Oxygenated groups mediate uniform and efficient assembly of TiO2 on the GO sheets.•GO–TiO2 are highly active photocatalysts under both near-UV/Vis and visible light.

Photocatalysis has gained relevance in many applications, including production of fuels, green synthesis of added value products and water detoxification. Graphene–TiO2 photocatalysts are attracting great attention, but they should be prepared adequately, protecting the carbon material from the surrounding reactive media, maximizing the contact between TiO2 and graphene, and envisaging broad spectral response. Hereby, graphene oxide was chemically reduced using vitamin C and glucose (environmental friendly reducing agents) as well as hydrazine, and the evolution of the graphene oxygenated surface groups was systematically analyzed (pHPZC, TPD, TG, XPS, DRUV–Vis, Raman and ATR–FTIR). These functionalities (such as epoxy and hydroxyl groups) mediate the efficient and uniform assembly of the TiO2 nanoparticles on the graphene oxide sheets, leading to highly efficient photocatalysts both under near-UV/Vis and visible light, which is of particular relevance for solar applications.

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Keywords
Graphene oxide; Chemical reduction; Oxygenated surface groups; TiO2; Photocatalysis
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Role of oxygen functionalities on the synthesis of photocatalytically active graphene–TiO2 composites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 329–340
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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