Catalytic decomposition of the reactive dye Uniblue A on hematite. Modeling of the reactive surface.

Abstract

Experimental results from the adsorption and subsequent catalytic combustion of the reactive dye Uniblue A on hematite indicate that this iron oxide can be used as an affordable catalyst for environmental purposes. Uniblue A was adsorbed on hematite and the products of the catalytic oxidation in O2 atmosphere were analyzed by thermal programmed gas-chromatography/mass spectrometry (STDS-GC-MS) analysis. The catalytic combustion of Uniblue A in the presence of hematite led to about 40% conversion of the dye C-content into CO2 at T = 275 degrees C. The activation energy (Ea) for the desorption of CO2 and other polyaromatic hydrocarbons (PAHs) from the hematite surface was determined to be 23.4 kcal mol-1. Identification of the species of Uniblue A in solution and those existing on the hematite surface was carried out in the framework of the generalized two-layer diffuse model. The modeling of the amount of dye absorbed on hematite is in good agreement with the experimental data.

• Authors: F Herrera, A Lopez, G Mascolo, P Albers, J Kiwi
• Journal: Water research (Water Res) Vol. 35 Issue 3 Pg. 750-60 (Mar 2001) ISSN: 0043-1354 [Print] England
• PMID: 11228974 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anthraquinones
• Coloring Agents
• Ferric Compounds
• Sulfonic Acids
• ferric oxide
• uniblue A

Topics

• Adsorption
• Anthraquinones
• Catalysis
• Coloring Agents
• Ferric Compounds
• Gas Chromatography-Mass Spectrometry
• Hydrogen-Ion Concentration
• Models, Chemical
• Sulfonic Acids