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Type: Artigo de periódico
Title: ZnSO4-TiO2 doped catalyst with higher activity in photocatalytic processes
Author: Zhiyong, Y
Bensimon, M
Sarria, V
Stolitchnov, I
Jardim, W
Laub, D
Mielczarski, E
Mielczarski, J
Kiwi-Minsker, L
Kiwi, J
Abstract: This study presents the synthesis and activity Of ZnSO4-TiO2 coated Raschig rings (RR). The activity of the Zn-doped catalyst (from now on Zn-TiO2/RR) was found to be higher than of the pure Degussa P25 TiO2 during the photodegradation of organic compounds. The most suitable doping level of TiO2 for Zn was 4 mol% noted as Zn (4% mol)-TiO2/RR during the degradation of azo-dye Orange II and of the transparent 2-propanol solutions. The degradation kinetics of the probe molecules was systematically investigated as a function of the catalyst make-up and some of the solution parameters. XPS measurements show Zn 2p(3/2) peak positions for Zn-TiO2 sample in the range 1021.58-1022.00 eV. This energy range was observed to be lower than 1022.54 eV recorded for the reference ZnSO4 sample. This shift indicates that the Zn-atoms act as electron acceptors in the Zn-doped TiO2 and may be responsible for the higher catalytic activity observed for the Zn (4% mol)-TiO2/RR compared to the TiO2/RR photocatalyst during Orange II degradation. Insight is given onto the complex oxidation/reduction processes takes place at the interface of Zn-TiO2. The changes occurring in the Zn, TiO2 and S catalyst components are discussed as a function of the time of reaction. The Zn-TiO2 catalyst was characterized by elemental analysis (EA), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), confocal microscopy, X-ray photoelectron microscopy (XPS) and X-ray diffraction (XRD). (C) 2007 Elsevier B.V. All rights reserved.
Subject: photocatalysis
orange II discoloration
Country: Holanda
Editor: Elsevier Science Bv
Citation: Applied Catalysis B-environmental. Elsevier Science Bv, v. 76, n. 41671, n. 185, n. 195, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.apcatb.2007.05.025
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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