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Croatica Chemica Acta, Vol. 91 No. 3, 2018.

Original scientific paper

https://doi.org/10.5562/cca3292

Influence of Titanium Dioxide Preparation Method on Photocatalytic Degradation of Organic Dyes

Vanja Gilja orcid id orcid.org/0000-0002-7656-0034 ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
Ljerka Kratofil Krehula orcid id orcid.org/0000-0002-8742-1574 ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
Zvonimir Katančić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
Stjepko Krehula orcid id orcid.org/0000-0001-6956-4478 ; Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
Zlata Hrnjak-Murgić orcid id orcid.org/0000-0003-4729-5603 ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
Jadranka Travas-Sejdic ; Polymer Electronics Research Centre, School of Chemical Sciences, University of Auckland, Auckland, New Zealand

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Abstract

Titanium catalysts (TiO2) were synthesized by three different methods. Their photocatalytic activity was validated through photodegradation of Reactive Red 45 (RR45) azo dye and Acid Blue 25 (AB25) anthraquinone dye in an aqueous solution under UV irradiation. TiO2 photocatalysts were characterized by FTIR, XRD and SEM. Photosensitivity and TiO2 activity range were characterized by UV/Vis spectroscopy. Photocatalytic validation has been made by way of determining the degree of RR45 and AB25 removal. TOC was determined as a measure of the mineralization of RR45 and AB25 by photocatalysis. The stability of TiO2 catalysts and a possibility of using them in consecutive photocatalysis cycles have also been studied. The results show that the photocatalytic efficiency depends on the crystal structure of TiO2. The size of crystallites depends on synthesis conditions. From the results of photocatalytic efficiency it is concluded that the chemical interaction between a catalyst and a dye strongly depends on the dye chemical structure.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

titanium dioxide; photocatalysis; organic dyes; wastewater treatment

Hrčak ID:

203396

URI

https://hrcak.srce.hr/203396

Publication date:

29.12.2018.

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