Journal
WATER RESEARCH
Volume 35, Issue 3, Pages 750-760Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(00)00295-5
Keywords
Uniblue A; catalytic combustion; adsorption; hematite; by-products; modeling
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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 he used as an affordable catalyst for environmental purposes. Uniblue A was adsorbed on hematite and the products of the catalytic oxidation in O-2 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 degreesC. The activation energy (E-a) for the desorption of CO, 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 earned 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. (C) 2001 Elsevier Science Ltd. All rights reserved.
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