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Photocatalytic performance of ZnO nanomaterials for self sensitized degradation of malachite green dye under solar light

Paper ID Volume ID Publish Year Pages File Format Full-Text
39524 45826 2015 8 PDF Available
Title
Photocatalytic performance of ZnO nanomaterials for self sensitized degradation of malachite green dye under solar light
Abstract

•ZnO nanomaterials were synthesized by different synthetic methodologies.•Hydrothermal method creates more surface O2 vacancies in ZnO nanomaterials.•The correlation between PL and PC activity of ZnO nanomaterials were drawn.•ZnO nanomaterials exhibit excellent PC activity for photodegradation of MG dye.•The CO2 evolved due to mineralization of MG was determined by Warburg manometer.

ZnO nanomaterials of different morphologies are synthesized by different methodologies. These semiconductor photocatalysts are potentially explored for self-sensitized photodegradation of malachite green (MG) dye in water in a batch reactor. The effects of various parameters like initial dye concentration, catalyst loading, solution pH, light source on degradation efficiency was also investigated. The experimental results showed substantial reduction of COD, besides removal of colour. The photodegradation of MG dye followed the pseudo first order kinetics of Langmuir–Hinshelwood model. The hydrothermally synthesized flower shaped homocentric pencil like ZnO nanorod bundles exhibit excellent photocatalytic activity under solar light. A comparative study of photodegradation efficiency among ZnO nanoparticles, ZnO nanoparticles (hydrothermal) and flower shaped homocentric pencil like ZnO nanorod bundles were also performed. Semiconductor photocatalysis often leads to partial or complete mineralization of organic pollutants. The CO2 gas evolved due to mineralization of MG was determined using Warburg manometric method under solar light. The possible mechanism of photodegradation under both solar and UV light were also proposed.

Graphical abstractZnO nanomaterials were successfully synthesized and effectively used as photocatalyst for self sensitized photodegradation of malachite green (MG) under solar light. The complete mineralization of MG was confirmed by determining the CO2 production using Warburg manometric method.Figure optionsDownload full-size imageDownload high-quality image (301 K)Download as PowerPoint slide

Keywords
Self-sensitized photodegradation; Malachite green dye; ZnO nanomaterials; Langmuir–Hinshelwood; Warburg apparatus
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 490, 25 January 2015, Pages 42–49
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