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Optimization and mechanism elucidation of the catalytic photo-degradation of the dyes Eosin Yellow (EY) and Naphthol blue black (NBB) by a polyaniline-coated titanium dioxide nanocomposite

Paper ID Volume ID Publish Year Pages File Format Full-Text
44886 46375 2015 13 PDF Available
Title
Optimization and mechanism elucidation of the catalytic photo-degradation of the dyes Eosin Yellow (EY) and Naphthol blue black (NBB) by a polyaniline-coated titanium dioxide nanocomposite
Abstract

•PTO nanocomposite was employed for degradation of Eosin Y and Naphthol Blue Black.•Fast degradation achieved where 99% of 50 mg L−1 of dye was removed within 1 h.•Heterogeneous photocatalysis where degradation increased with increasing dosage.•The degradation process was optimized by response surface methodology.•The degraded products were identified by LCMS and mechanism is proposed.

A polyaniline-coated titanium oxide nanocomposite (PTO) was synthesized, characterized and used in the catalytic photo-degradation of the anionic dyes Eosin Yellow (EY) and Naphthol blue black (NBB). An emphasis was placed on the key parameters governing the degradation process. It was noted that the extent of degradation was higher at lower pH for both dyes. The rate of degradation of both dyes also increased with increasing catalyst dosage, Langmuir–Hinselwood models and other second-order kinetic models verified that heterogeneous photocatalysis occurred. The rate of degradation increased with increasing initial dye concentrations and only increased gradually with an increase in UV light intensity in the absence of the catalyst. The optimum operating conditions for the degradation was also predicted using response surface methodology (RSM) analysis as a statistical tool. This analysis revealed that the initial dye concentration, pH and dosage of the catalyst are all significant parameters in the degradation process. The combined effect of pH and initial concentration was antagonistic whilst the combined effect of initial concentration and catalyst dosage and the combined effect of catalyst dosage and pH were both synergistic. The optimum degradation percentages were found to be 99.85 and 99.74 for EY and NBB respectively. These optimum percentage degradations were observed at pH 3.0, initial dye concentration 15 mg L−1 and a catalyst dosage of 1.0 g L−1. LC–MS data was also used to identify the photodegradation products and to propose a mechanism of photodegradation.

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Keywords
Photocatalytic degradation; Eosin Yellow, Naphthol blue black; Polyaniline coated titanium oxide nanocomposite; Response Surface Methodology
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Optimization and mechanism elucidation of the catalytic photo-degradation of the dyes Eosin Yellow (EY) and Naphthol blue black (NBB) by a polyaniline-coated titanium dioxide nanocomposite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 330–342
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