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Photocatalytic degradation of phenol by semiconducting mixed oxides derived from Zn(Ga)Al layered double hydroxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
44888 46375 2015 9 PDF Available
Title
Photocatalytic degradation of phenol by semiconducting mixed oxides derived from Zn(Ga)Al layered double hydroxides
Abstract

•ZnAl and ZnGaAl layered double hydroxides with varying molar ratios were prepared.•Solid solutions obtained by calcination possess semiconducting properties.•80 and 40 ppm of phenol were photocatalytically degraded.•Maximum degradation was ca. 80% in 6 h.

The synthesis and characterization of ZnAl and ZnGaAl layered double hydroxides and the mixed oxides derived from their calcination is presented. The semiconducting properties of the mixed oxides were analyzed by DR-UV–Vis. It was found that all mixed oxides are semiconductors with band gaps close to that of ZnO. Also, substitution of Al3+ for 5 or 10% wt. of Ga3+ decreases the band gap below that of ZnO, despite the fact that gallium oxide is a wide band gap semiconductor. Then, the photodegrading capabilities of the mixed oxides were tested using phenol, a very recalcitrant compound, as a probe. Nearly 80% of initial 40 ppm and 60% of initial 80 ppm of phenol were degraded in 6 h over ZnAl-3 and ZnGaAl-5% photocatalysts.

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Keywords
Layered double hydroxides; Semiconductors; Photocatalysis; Phenol degradation; Band gap energy
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Photocatalytic degradation of phenol by semiconducting mixed oxides derived from Zn(Ga)Al layered double hydroxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 352–360
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
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