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2 Physicochemical Problems of Mineral Processing

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Carbon dioxide photoconversion. The effect of titanium dioxide immobilization conditions and photocatalyst type

100%

Cybula A. , Klein M. , Zielińska-Jurek A. , Janczarek M. , Zaleska A.

Physicochemical Problems of Mineral Processing

2012

tom Vol. 48, iss. 1

159-167

Carbon dioxide and water vapor were effectively photoconverted to methane using either pure or modified-TiO2 and UV-Vis irradiation. The process of photoconversion in the gas phase was carried out in a tubular reactor equipped with a perforated TiO2-coated support. The effect of selected parameters of TiO2 immobilization procedure, such as the time and temperature of drying step and the photocatalyst amount, on photocatalytic efficiency was investigated. The effect of TiO2 loading with Ag/Au nanoparticles on CO2 photoconversion efficiency was also studied. CH4 was found to be the major photoreduction product. The highest methane production was observed after irradiation of CO2+H2O mixture over Au-TiO2 photocatalyst. After one hour of UV-Vis irradiation 503 ppm of methane was formed.

Preparation of ag/cu-doped titanium (iv) oxide nanoparticles in w/o microemulsion

86%

Zielińska-Jurek A. , Walicka M. , Tadajewska A. , Łącka I. , Gazda M. , Zaleska A.

Physicochemical Problems of Mineral Processing

2010

tom Vol. 45

113-126

The Cu-TiO2 and Ag/Cu-TiO2 nanoparticles have been prepared using a water-in-oil microemulsion system of water/AOT/cyclohexane. The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution under visible light irradiation. The bioactivity of Ag/Cu-doped titanium (IV) oxide nanocomposites was estimated using bacteria Escherichia coli and Staphylococcus aureus, yeast Saccharomyces cerevisiae and pathogenic fungi belonging to Candida family. The photocatalysts' characteristics by X-ray diffraction, BET surface area measurements, Scanning Electron Microscopy (SEM) energy dispersive spectroscopy (EDS) analysis showed that a sample with the highest photo- and bioactivity had anatase structure, about 190 m2/g specific surface area, absorbed light for ?>400 nm and contained 1.45 mass % of silver, 1.40 mass % of copper and 59.4 mass % of Ti.