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Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
45542 46416 2015 11 PDF Available
Title
Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity
Abstract

•Step wise growth formation of ZnO rods (aspect ratio 8–12) from its hydroxide precursor via sonochemical assisted aqueous solution process.•ZnO rods prepared at the optimized condition exhibits superior photocatalytic activity on UV irradiation.•Defects play a major role in controlling the photodegradation of methyl violet.

The aqueous solution growth process of ZnO rods, starting from zinc hydroxide formed during the ultrasonic precipitation of zinc acetate and ammonium hydroxide has been demonstrated here. A dispersion consisting of 0.3 (w/v) % zinc hydroxide in water on heating at 80 ± 5 °C for 6 h has resulted in the formation of ZnO rods having an aspect ratio between 8 and 12. We have monitored the growth of ZnO rods as a function of different reaction parameters. The as-prepared rods have also been characterized by optical and Raman spectroscopic methods in addition to other techniques. Further, we also investigated the photocatalytic degradation of methyl violet, which is a well known textile pollutant by using the as-prepared ZnO rods and found that the degradation was more effective using a 365 nm light source than using a 254 nm light source. This result confirms that the as-processed ZnO rods could be used directly under sunlight for the degradation of methyl violet present in polluted water. Our experimental results, confirmed that the sample with more oxygen defects shows better photocatalytic degradation of the dye molecule due to the involvement of oxygen vacancy defects and oxygen interstitials in the charge recombination process and helps in better catalytic reaction under a UV lamp.

Graphical abstractWe have investigated the photocatalytic degradation of methyl violet, which is a well known textile pollutant by using as-prepared ZnO rods and found that the degradation was more effective using a 365 nm light source than using a 254 nm light source.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Solution growth; ZnO rods; Methyl violet; Shallow donor; Photodegradation
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Solution grown ZnO rods: Synthesis, characterization and defect mediated photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 128–138
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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Any Questions? feel free to contact us