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Author(s): J. Herney Ramirez
Carlos A. Costa
Luís M. Madeira
G. Mata
Miguel A. Vicente
M. L. Rojas Cervantes
R. M. Martín Aranda
Title: Fenton-like oxidation of Orange II solutions using heterogeneous catalysts based on saponite clay
Issue Date: 2006
Abstract: Fe-clay catalysts have been prepared and tested for Orange II oxidation with H2O2 in aqueous solution. Thereaction is carried out in a batch reactor, using different hydrogen peroxide concentrations, and in a wide range oftemperature and pH values. Twelve samples were prepared, with three different iron loads (7.5, 13.0 and 17.0 %,w/w), and using four iron salts as precursors, namely Fe(II) acetate, Fe(II) oxalate, Fe(II) acetylacetonate and Fe(III)acetylacetonate. The samples were characterized using X-ray diffraction, thermal analysis, infrared spectroscopy andadsorption of nitrogen at 77K. The catalytic results show that these solids present good catalytic properties for thedegradation and mineralization of Orange II solutions, allowing to reach, in the best conditions and after 4h ofoxidation, 99% of dye degradation with 91% of TOC (Total Organic Carbon) reduction (at 70ºC), using only ca. 90 mgof clay catalyst per litre of solution. Nevertheless, 96% of dye removal with 82% of mineralization were also reachedat 30ºC. Besides, the amount of iron released into the final solution is lower than 1 ppm, in the worst of the cases,and 0.09 ppm in the best case.
Subject: Engenharia química
Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Source: First European Conference on Environmental Applications of Advanced Oxidation Processes (EAAOP-1)
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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