Kinetic study on heterogeneous photocatalytic degradation of reactive orange 16 into a slurry reactor

Anca Florentina Caliman1, Apostolis Antoniadis2, Ioannis Poulios2, Matei Macoveanu1

1 Gh. Asachi Technical University, Department of Environmental Engineering and Management, Bd. Mangeron 71A, 700050, Iasi, Romania;
2 Aristotle University of Thessaloniki, Laboratory of Physical Chemistry, Department of Chemistry, 54006 Thessaloniki, Greece

Abstract


The photocatalytic degradation of a textile azo dye in a slurry photoreactor with recirculation of the suspension, by heterogeneous photocatalytic processes, was studied in this paper. A simple kinetic model for variation of the photodegradation rate in time was proposed for the investigated system. Characteristics of the reactor were described and its photocatalytic performances in degradation of the studied textile dye under solar illumination were ascertained. The photodegradation of the organic molecule was demonstrated to follow approximately a pseudo-first kinetic order, according to the Langmuir- Hinshelwood model. Study concerning the effect of light intensity revealed a rate dependence rather of square root of the intensity within the investigated range.

Keywords


heterogeneous photocatalysis; slurry reactor; RO16; TiO2

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