Effects of concentration and UV radiation wavelengths on photolytic and photocatalytic degradation of azo dyes aqueous solutions by sol-gel TiO2 films

Marinović, Veronika and Ljubas, Davor and Ćurković, Lidija (2016) Effects of concentration and UV radiation wavelengths on photolytic and photocatalytic degradation of azo dyes aqueous solutions by sol-gel TiO2 films. = Effects of concentration and UV radiation wavelengths on photolytic and photocatalytic degradation of azo dyes aqueous solutions by sol-gel TiO2 films. The Holistic Approach to Environment, 7 (1). pp. 3-14. ISSN 1848-0071. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. . Točan broj autora: 3.

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Abstract

The photocatalytic and photolytic degradation of anionic azo dyes Methyl Orange and Congo Red dye aqueous solutions was investigated in glass reactors with/without TiO2 films that were irradiated with UV light. Two nanostructured sol-gel TiO2 films were prepared by means of the dip-coating technique with and without of polyethylene glycol (PEG) as a structure- directing agent. Experiments were carried out by varying the concentration of dyes, TiO2 films and sources of UV radiation. The concentrations of dyes were 0.0125 mmol L-1, 0.025 mmol L-1 and 0.05 mmol L-1 ; the wavelengths of the incident ultraviolet light were predominantly 254 (UV-C) and 365 nm (UV- A). In the presence of TiO2 film UV-C radiation showed higher degradation efficiency for both dyes than UV-A radiation. Also, UV-C radiation without TiO2 photocatalyst was capable of degrading both dyes, while UV-A radiation alone did not show a potential for dyes degradation. Higher photoactivity showed TiO2 film with addition of PEG.

Item Type:	Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian):	UV radiation, TiO2 film, Congo red dye, Methyl Orange dye, photocatalysis, photolysis
Divisions:	1000 Department of Materials > 1010 Chair of Materials and Tribology 500 Department of Energy, Power Engineering and Environment > 540 Chair of Water and Environmental Engineering
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Date Deposited:	13 Apr 2016 12:01
Last Modified:	29 Aug 2017 12:09
URI:	http://repozitorij.fsb.hr/id/eprint/5600

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