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Gliding arc plasma assisted photocatalytic degradation of anthraquinonic acid green 25 in solution with TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
48720 46519 2007 10 PDF Available
Title
Gliding arc plasma assisted photocatalytic degradation of anthraquinonic acid green 25 in solution with TiO2
Abstract

Anthraquinonic acid green 25 (AG 25) removal was investigated by plasmachemistry using non-thermal gliding arc at atmospheric pressure. The gaseous species formed in the discharge, and especially OH radicals, induce strong oxidizing effects in the target solution. The removal of the dye was carried out in the absence and presence of TiO2 as photocatalyst. The decolourization of AG 25 was followed by UV–vis spectrometry (at 643 nm), while the degradation was followed by COD measurements. The effects of operating variables such as initial concentration of AG 25 and catalyst concentration were investigated. Experiments were carried out to optimise the amount of TiO2. The results showed that maximum degradation was attained for 2 g L−1 TiO2 concentration. At this optimum concentration, the dye (80 μM) was totally decolourized within 15 min of plasma-treatment time, and 93% removal of initial COD was attained after a 180-min plasma-treatment time. In the absence of catalyst, colour removal was 46% after 15 min, while COD abatement reached 84% after 180 min. The extent of degradation decreased with initial concentration and the time required for complete degradation increased. In all cases, the plasma-treated samples in the presence or absence of catalyst were found to follow pseudo-first order reaction kinetics. The TiO2-mediated plasmachemical process showed potential application for the treatment of dye solutions, resulting in the mineralization of the dye confirmed by sulfate ion formation.

Keywords
Anthraquinonic dye; Degradation; Gliding arc; Plasmacatalysis; TiO2
First Page Preview
Gliding arc plasma assisted photocatalytic degradation of anthraquinonic acid green 25 in solution with TiO2
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 72, Issues 3–4, 30 March 2007, Pages 304–313
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis