Andreia MOLEA, Violeta POPESCU, Mihaela Ligia UNGURESAN


The paper describes the mathematical modelling of the photocatalytic activity of TiO2 powders obtained by chemical precipitation using titanium chloride III as precursor. The powders were characterized by X-ray diffraction and by UV-Vis spectroscopy. Using the data were modelled the structural and optical properties based on Scherrer and Tauc relations. The average of the crystallite size was calculated using Scherrer’s relation. The energy band gap calculated with Tauc’s relation was found to be 3.8 eV and 2.8 eV, before and after the heat treatment. The photocatalytic activity of TiO2 has been determined by degradation of Methylene Blue in presence of TiO2 suspension with the exposure to sunlight. Experimental data showed that the photodegradation process is described after a first order kinetic which is rationalized in terms of Langmuir-Hinshelwood model.

Key words: titanium dioxide, catalyst, Scherrer relation, Tauc low, Langmuir-Hinshelwood model

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