Photocatalytic decolouration of Orange II by ZnO active layers screen-printed on ceramic tiles
authors Marto, J; Marcos, PS; Trindade, T; Labrincha, JA
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords ZnO; Visible light photocatalysis; Screen-printed layers
keywords ZINC-OXIDE POWDER; AZO-DYE; COMMERCIAL DYES; TIO2 POWDER; DEGRADATION; WATER; 4-CHLOROPHENOL; IRRADIATION; EFFICIENCY; PARTICLES
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. (C) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2009
volume 163
issue 1
beginning page 36
ending page 42
digital object identifier (doi) 10.1016/j.jhazmat.2008.06.056
web of science category Engineering, Environmental; Engineering, Civil; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000263439800005
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