Synthesis of the mixed oxides of iron and quartz and their catalytic activities for the Fenton-like oxidation

Four mixed oxides of iron and silica including quartz/amorphous iron(III) oxide (Q 1), quartz/maghemite (Q 2), quartz/magnetite (Q 3) and quartz/goethite (Q 4) were prepared and characterized by XRD, BET surface area and chemical analyses. Catalytic activity of four mineral oxides was examined by em...

Full description

Saved in:
Bibliographic Details
Published in:Catalysis communications 2008-03, Vol.9 (5), p.955-959
Main Authors: Hanna, K., Kone, T., Medjahdi, G.
Format: Article
Language:English
Subjects:
Electrostatic interactions
Fenton-like
Heterogeneous catalysts
Mixed oxides
Oxidation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Four mixed oxides of iron and silica including quartz/amorphous iron(III) oxide (Q 1), quartz/maghemite (Q 2), quartz/magnetite (Q 3) and quartz/goethite (Q 4) were prepared and characterized by XRD, BET surface area and chemical analyses. Catalytic activity of four mineral oxides was examined by employing methyl red (MR) as a model compound for the Fenton-like oxidation at two pH values (5 and 7). It was found that their catalytic activities follow the order Q 4 > Q 1 > Q 2 > Q 3 at pH 5, while the trend is modified at pH 7. Dye adsorption to the catalyst changed significantly with the pH value. The highest catalytic activity of all solids at pH 5 is probably due to the electrostatic interactions between the dye molecules and surface functional groups of catalyst at this pH value. The mixed oxides catalysts exhibited low iron leaching, good structural stability and no loss of performance in second reaction cycle.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.09.035