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Efficient photocatalytic reduction of aqueous Cr(VI) over CaSb2O5(OH)2 nanocrystals under UV light illumination

Paper ID Volume ID Publish Year Pages File Format Full-Text
46079 46429 2012 6 PDF Available
Title
Efficient photocatalytic reduction of aqueous Cr(VI) over CaSb2O5(OH)2 nanocrystals under UV light illumination
Abstract

CaSb2O5(OH)2 nanocrystals were synthesized via traditional and microwave-assisted hydrothermal methods from aqueous solution of CaCl2 and KSb(OH)6, respectively. The structures, Brunauer–Emmett–Teller (BET) specific surface areas and optical properties of the as-synthesized samples were characterized by X-ray diffraction, transmission electron microscopy, N2 sorption–desorption isotherms, and UV–vis diffuse reflectance spectra. The results of photocatalytic reduction of aqueous Cr(VI) revealed that CaSb2O5(OH)2 possessed a superior activity greatly larger than that of commercial P25 (Degussa Co.). It was shown that proton supply played a crucial role in the reduction reaction. The Cr(VI) photo-reduction rates were systematically accelerated as the proton concentration increased in the aqueous suspensions. Formate ions were also shown to exert a dramatic accelerating influence on Cr(VI) reduction in the system. This observation should be rationalized by considering that these species act as hole scavengers in the reduction process. The consequent improvement in quantum yield combines with the protons provided by H2SO4 result in the observed rate enhancement.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Cr(VI) can be effectively photocatalytic reduced over CaSb2O5(OH)2. ► CaSb2O5(OH)2 exhibits substantially higher catalytic activity than TiO2(P25). ► Cr(VI) reduction rate increases with the decrease of initial pH.

Keywords
Photocatalysis; Reduction; Cr(VI); Ultraviolet; CaSb2O5(OH)2
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Efficient photocatalytic reduction of aqueous Cr(VI) over CaSb2O5(OH)2 nanocrystals under UV light illumination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 125, 21 August 2012, Pages 282–287
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