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 Photocatalytic decolouration of orange II by ZnO active layers screen-printed on ceramic tiles
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6186

title: Photocatalytic decolouration of orange II by ZnO active layers screen-printed on ceramic tiles
authors: Marto, J.
Marcos, P. São
Trindade, T.
Labrincha, J. A.
keywords: ZnO
Visible light photocatalysis
Screen-printed layers
issue date: Apr-2009
publisher: Elsevier
abstract: In this work ZnO layers have been deposited by screen-printing in common ceramic tiles. These layers were characterized and tested for the photocatalytic degradation of the organic dye Orange II in aqueous solutions, using a batch photoreactor either under visible light provided by a Philips ML-160W lamp or under direct exposure to sunlight. For sake of comparison, ZnO suspensions have also been evaluated for similar reacting conditions. The influence of experimental parameters such as (i) firing temperature of the printed layer; (ii) layer thickness; and (iii) operation time have been investigated. Screen-printed ZnO layers obtained in optimal processing conditions showed photocatalytic activity comparable to aqueous ZnO suspensions. The maximal attenuation degree is over 70% and decolourisation rate, assuming that reaction kinetics follows a pseudo-first order rate law, is over 0.015 min−1. Thus these ZnO-layered ceramic tiles can be regarded as an alternative to photocatalytic suspensions of the same material with the advantage of avoiding the removal of the photocatalyst.
URI: http://hdl.handle.net/10773/6186
ISSN: 0304-3894
publisher version/DOI: dx.doi.org/10.1016/j.jhazmat.2008.06.056
source: Journal of Hazardous Materials
appears in collectionsDQ - Artigos

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