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Photocatalytic degradation of an organic dye in some aqueous buffer solutions using nano titanium dioxide: A kinetic study

Montazerozohori M., Nasr-Esfahani M., Joohari S.

Environment Protection Engineering

2012

Vol. 38, nr 3

45--55

Photocatalytic degradation of an organic dye, emerald green, on nano titanium dioxide (anatase 99.5%) at basic buffer pH of 7, 8 and 9 has been investigated. The effects of various operating parameters such as initial concentration of dye, catalyst dosage, bufferic pH and irradiation time on photocatalytic degradation have been studied in a photoreactor cell containing high pressure mercury lamp to obtain the optimum conditions. COD removal was found to be 65-71% confirming considerable mineralization. The photodegradation of the dye obeyed a pseudo-first order kinetics according to the Langmuir-Hinshelwood model at all used buffer pH. The observed rate constants (Kobs) of photocatalytic degradation were 3.3 ×10-2 min-1, 7.09 × 10-2 min-1 and 1.32 × 10-1 min-1 at buffer pH of 7-9 respectively. Furthermore, the Langmuir-Hinshelwood rate constants, kr and adsorption constants, KA are reported for current process at various buffer pH.

Assessment of radiant flux absorption by irradiated phase on the kinetics of photocatalytic reactions

Adamek E., Ziemiańska J., Lipska L., Makowski A., Sobczak A., Baran W.

Physicochemical Problems of Mineral Processing

2010

Vol. 45

5-14

In this study, the kinetics equation describing heterogeneous photocatalytic process in relation with the absorption of radiation by inactive photochemically reagents was presented. The proposed expression was verified based on the results of degradation process of selected azo-dyes. The experiments were carried out in one- and two component solutions in the presence of TiO2 (anatase) during UV-a irradiation.