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Type: Artigo de periódico
Title: Semiconductor-assisted photodegradation of lignin, dye, and kraft effluent by Ag-doped ZnO
Author: Gouvea, CAK
Wypych, F
Moraes, SG
Duran, N
Peralta-Zamora, P
Abstract: This work reports a preliminary study of semiconductor-assisted photochemical degradation of lignin, Remazol Brilliant Blue R and Kraft E1 paper effluent by using ZnO and Ag-doped ZnO photocatalysts. The doped semiconductor was prepared in the reaction media by photoreduction of silver nitrate. With the use of 100 mg of ZnO and 15 mg of Ag-ZnO, almost total decolorization of the dye and lignin samples in reaction times lower than 60 min were observed. Extending the photochemical reaction up to 120 min, the total organic carbon content (TOC) was reduced in 90%. For the paper effluent, a fast decolorization was obtained for relatively short reaction times. However, de TOC reduction was negligible (near of 10%) up to high reaction times (300 min). By using the Ag-ZnO photocatalyst, the toxicity of lignin and Kraft E1 effluent toward E. Coil was completely removed. For the dye, the formation of transient toxic species was observed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Subject: reactive dye
Kraft effluent
photochemical degradation
Ag-doped ZnO
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0045-6535(99)00312-4
Date Issue: 2000
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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