F Herrera, A Lopez, G Mascolo, P Albers, J Kiwi
Index: Water Res. 35(3) , 750-60, (2001)
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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.
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