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|title: ||Photocatalytic decolouration of orange II by ZnO active layers screen-printed on ceramic tiles|
|authors: ||Marto, J.|
Marcos, P. São
Labrincha, J. A.
Visible light photocatalysis
|issue date: ||Apr-2009|
|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.|
|publisher version/DOI: ||dx.doi.org/10.1016/j.jhazmat.2008.06.056|
|source: ||Journal of Hazardous Materials|
|appears in collections||DQ - Artigos|
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