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Author(s): Filipa M. Duarte
Francisco J. Maldonado-Hódar
Luís M. Madeira
Title: Influence of the iron precursor in the preparation of heterogeneous Fe/activated carbon Fenton-like catalysts
Issue Date: 2013
Abstract: In this work, the influence of the iron salt precursor for the impregnation of a commercial activated carbon (AC) is evaluated in order to choose the best catalyst in the removal of the azo-dye Orange II fromwater by the heterogeneous Fenton-like process. Three iron salts were used: iron acetate, iron sulphateand iron nitrate, all catalysts being obtained with a content of 7% wt. of iron (Fe/AC) after pre-treatmentat 300 ◦C. The characterization of fresh and used materials was done by different techniques (N2 and CO2adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electronmicroscopy and thermal programmed desorption). The three catalysts presented different textural properties and distinct iron dispersions, along with different locations in the pore structure, thus leading toquite different materials for the envisaged application because those properties strongly influence thedifferent processes that contribute to the dye removal: adsorption, homogeneous Fenton process (dueto leached iron) and heterogeneous Fenton-like process (on the catalysts' surface). Iron in solution (orlocated more externally on the carbon surface) favours the discoloration but can somehow prevent theTOC removal (which also occurs by adsorption). The catalytic behaviour of the samples was correlatedwith the transformations on their textural and chemical characteristics. Ferrous acetate seems to be thebest option for the precursor to use on the basis of activity and particularly stability (i.e., possibility ofcatalyst reutilization due to low leaching).
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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