ZnO assisted photocatalytic degradation of acridine orange in aqueous solution using visible irradiation

A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carried out in aqueous heterogeneous medium containing ZnO as photocatalyst in a batch reactor. Visible light in the absence of ZnO has negligible effect on degradation. The disappearance of the dye, monitor...

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Veröffentlicht in:Desalination 2008-11, Vol.232 (1), p.80-90
Hauptverfasser: Pare, Brijesh, Jonnalagadda, S.B., Tomar, Hitendra, Singh, Pardeep, Bhagwat, V.W.
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container_end_page 90
container_issue 1
container_start_page 80
container_title Desalination
container_volume 232
creator Pare, Brijesh
Jonnalagadda, S.B.
Tomar, Hitendra
Singh, Pardeep
Bhagwat, V.W.
description A detailed investigation of photocatalytic degradation of the dye, acridine orange, has been carried out in aqueous heterogeneous medium containing ZnO as photocatalyst in a batch reactor. Visible light in the absence of ZnO has negligible effect on degradation. The disappearance of the dye, monitored spectrophotometrically, follows approximately pseudo-first order kinetics according to the Langmuir–Hinshelwood model. The total degradation of dye was tested using the chemical oxygen demand (COD) method. The addition of an optimal amount of hydrogen peroxide and potassium persulphate increases the degradation rate while NaCl and Na 2CO 3 decreases. The effect of addition of cationic and anionic surfactants has also been investigated. Bubbling of nitrogen in the reaction solution decreases the reaction rate. ZnO has been found experimentally to be a highly efficient photocatalyst for the degradation of acridine orange dye and hence there is a great potential in the treatment of organic pollutants such as dyes.
doi_str_mv 10.1016/j.desal.2008.01.007
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subjects Acridine orange
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Mineralization
Photocatalytic degradation
Pollution
Reactors
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Zinc oxide
title ZnO assisted photocatalytic degradation of acridine orange in aqueous solution using visible irradiation
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