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- Title
PHOTOCATALYTIC PERFORMANCE OF TiO<sub>2</sub>, CeO<sub>2</sub>, ZnO AND TiO<sub>2</sub>-CeO<sub>2</sub>-ZnO IN THE COURSE OF METHYL ORANGE DYE DEGRADATION.
- Authors
Milenova, Katya; Zaharieva, Katerina; Stambolova, Irina; Blaskov, Vladimir; Eliyas, Alexander; Dimitrov, Ljubomir
- Abstract
Commercial TiO2, CeO2, ZnO single oxides and a mixture of them at a mass ratio of 1:1:1 were mechanochemically treated (MCT). CeO2 was the best commercial sample prior to MCT because of its narrow band gap and high oxygen storage capacity. The powder X-ray diffraction analysis confirmed the existence of TiO2, CeO2 and ZnO phases in all MCT samples studied. The determined average crystallite size was in the range of 18 - 19 nm for the single component photocatalysts and of 10 - 15 nm for the ternary system. Following 30 min dark period the adsorption capacity of TiO2-CeO2-ZnO-MCT (0.263 mg/g) was the highest among those of the other materials. The behavior of the commercial and MCT photocatalytic materials (TiO2, CeO2, ZnO and TiO2-CeO2-ZnO) was studied in the course of photocatalytic oxidative degradation of Methyl Orange dye treated as a pollutant. The results obtained in an aqueous solution under UV irradiation showed that ZnO-MCT sample provided the highest photocatalytic effect (81% conversion) when compared to that of the other MCT materials. The degree of MO dye degradation decreased in the line: CeO2 (87%) > ZnO-MCT (81%) > ZnO (76%) > CeO2-MCT (67%) > TiO2-CeO2-ZnO-MCT (63%) > TiO2 (61%) > TiO2-MCT (49%).
- Publication
Journal of Chemical Technology & Metallurgy, 2017, Vol 52, Issue 1, p13
- ISSN
1314-7471
- Publication type
Academic Journal