Abstract
Titania based catalyst and TiO2 doped with zirconia were prepared by modified sol?gel method. The synthesized catalysts samples were characterized by BET, XRD, SEM and FTIR techniques. Photocatalytic activity was tested in the reaction of crystal violet (CV) dye decolorization/decomposition under UV light irradiation. The effect of several operational parameters, such as catalyst dosage, initial dye concentrations, duration of UV irradiation treatment and number of reaction cycles were also considered. The obtained results indicated faster dye decolorization with the increase of the catalyst amount and a decrease of initial CV concentrations. An influence of doping with zirconia on the physico-chemical properties of bare titania was studied. The doping procedure had affected photocatalytic properties of the final catalytic material, and had improved photocatalytic performances of doped catalyst on crystal violet decolorization/degradation in comparison to bare titania.
Highlights
Titania based catalyst and the anatase phase crystallite from 25.06 nm (TiO2) doped with zirconia were prepared by modified sol–gel method
There are very few studies [7,8,10,11] investigating an influence of zirconia/zirconium doping on physicochemical properties and catalyst activity of titania, and only a small number of papers [7,8,11,12] investigating photocatalytic reactions of degradation/ /decolorization of the organic dyes
The present study reports economical and environmentally friendly method for obtaining TiO2-based powders by using modified sol-gel method
Summary
Organic dyes present in water originate from textile and other industries may cause severe environmental damage and they are major ecological problem confronted by scientists nowadays [1]. Crystal violet is triphenylmetane dye that has been widely used in paper, leather and printing industry It is toxic, has a mutagenic effect, which includes, but is not limited, to water organisms, and it is considered to be cancerogenic [2,3]. There are very few studies [7,8,10,11] investigating an influence of zirconia/zirconium doping on physicochemical properties and catalyst activity of titania, and only a small number of papers [7,8,11,12] investigating photocatalytic reactions of degradation/ /decolorization of the organic dyes. Impacts of several process parameters on the photocatalytic performance of the bare TiO2 and TiO2 doped with zirconia were studied, including catalyst dosage, duration of irradiation treatment and initial dye concentrations, as well as number of reaction cycles. There are no completely identical reported and discussed results on physicochemical properties of these photocatalysts and their resulted catalytic performances in the scientific literature [4,7– –12]
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