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Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2–SiO2 nanocomposites generating excellent degradation activity of RhB dye

Paper ID Volume ID Publish Year Pages File Format Full-Text
47474 46473 2010 11 PDF Available
Title
Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2–SiO2 nanocomposites generating excellent degradation activity of RhB dye
Abstract

In this paper, we report a synchronous role of coupled adsorption and photocatalytic oxidation on ordered 2-D hexagonal mesoporous TiO2–SiO2 nanocomposites with large pore channels (>4.0 nm) and high specific surface areas (>70 m2 g−1). These mesoporous frameworks consist of anatase TiO2 nanocrystals and amorphous SiO2 nanomatrixes, which link mutually, coexist to form unique composite-walls, providing unprecedented spaces for “the synchronous role of coupled adsorption and photocatalytic oxidation”. SiO2 nanomatrixes are excellent adsorbents, providing better adsorption centers and enriching organic pollutant molecules; while anatase nanocrystals behave as photocatalytic active sites to oxide the organic molecules pre-enriched by the surrounding SiO2 particles. Moreover, the high accessible surface areas can provide more adsorptive and photocatalytically active sites; and the large mesopore channels allow the reactive molecules to diffuse more easily both into and out of the inner surfaces before and after photocatalytic reactions, respectively. Our strategy realizes the synchronous role by adjusting Ti/Si ratios, the number of surface hydroxyls, the size and crystallinity of the anatase nanocrystals on the unique composite-frameworks. The cationic rhodamine-B (RhB) dye is used as the target pollutant to characterize the adsorption performance and photocatalytic activities. Our results show that the synchronous role results in excellent photocatalytic degradation activity (k = 0.231 min−1), which is much higher than that of Degussa commercial P25 photocatalyst (k = 0.0671 min−1).

Graphical abstractSynchronous role of coupled adsorption and photocatalytic oxidation on unique 2-D hexagonal mesoporous anatase TiO2–SiO2 nanocomposites generates excellent photocatalytic degradation activity of RhB dye.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Synchronous role; Adsorption; Photocatalytic oxidation; Ordered mesoporous anatase TiO2–SiO2 nanocomposites; RhB dye
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Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2–SiO2 nanocomposites generating excellent degradation activity of RhB dye
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 95, Issues 3–4, 6 April 2010, Pages 197–207
Authors
, , , , , , , , , ,
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