Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/46341
Title: Highly concentrated phenolic wastewater treatment by the Photo-Fenton reaction, mechanism study by FTIR-ATR
Authors: Araña, J. 
Tello Rendón, E. 
Doa Rodríguez, J. M. 
Herrera Melián, J. A. 
González Díaz, O. 
Pérez Pea, J. 
UNESCO Clasification: 330301 Tecnología de la catálisis
Keywords: Photo-Fenton reaction
FTIR
Photodegradation
Polymerization
Issue Date: 2001
Publisher: 0045-6535
Journal: Chemosphere 
Abstract: Phenol degradation by Photo-Fenton reaction has been studied in highly concentrated wastewaters and most intermediate species have been identified by Fourier Transform IR-Spectroscopy with ATR device. During the photodegradation of highly concentrated phenol solutions, the formation of dissolved and precipitate tannin has been observed. The possibility of a Fe3+-Pyrogallol complex formation, previous to the tannin formation, has been proposed too. The complex formation involving Fe3+ ions could be related to the observed Photo-Fenton activity decrease. Tannin formation inhibits the complete mineralization of phenol because OH radicals attack will produce further condensation steps and the polymer size increase. This fact limits the applicability of the process for highly concentrated phenolic wastes mineralization. However, the tannin precipitation allows its separation from the solution by conventional filtration, and reduction of the corresponding dissolved organic carbon. These observations have been proved from the identification of primary degradation products, catechol and hydroquinone. Catechol is considered to be the first step for the formation of tannins. Degradation process for phenol, catechol and hydroquinone have been monitored by total organic carbon (TOC) measurements along the reaction time span. From these results, a global mechanism for the Photo-Fenton degradation of phenol is proposed.
URI: http://hdl.handle.net/10553/46341
ISSN: 0045-6535
DOI: 10.1016/S0045-6535(00)00359-3
Source: Chemosphere [ISSN 0045-6535], v. 44, p. 1017-1023
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