Abstract
The influence of mechanochemical (MChT) and sonochemical (UST) treatments of TiO2 and WO3 oxide mixture (molar ratio 1:1) on its properties was studied. By XRD method it was shown that both treatments have not influence on phase composition of the mixture, the reflexes of initial oxides were observed only, but the treatment leads to the change of intensity of the reflexes and their widths. The calculations from XRD data and SEM results of the samples investigations show that both treatments led to a decrease of the particles sizes of both oxides. The influence of the treatment medium nature (air, water, ethanol) on the dimensions of the formed particles was shown. The maximal decrease of the particles sizes was observed at MChT and UST in water and ethanol which god accordance XTD and SEM data confirmed. The particles sizes decrease accompanied by an increase of the samples specific surface area. The photocatalytic properties of TiO2/WO3 samples in the reactions of drugs (metronidazole, analgine, novocaine) decomposition in water solution were studied. It was established that activity of the samples (rate constant and degree of drug decomposition) dependences from drug nature and changes in next order: metronidazole >analgine> novocaine. The treatment of the sample TiO2/WO3 permits to an increase its activity in all studied drugs photodecomposition in comparison with initial mixture and individual oxides. The highest activity was observed for the samples after their MChT and UST in ethanol medium. It was established that for all studied drugs the rate constant and degree of drug decomposition increase with a decrease of band gap value of sample in comparison with initial TiO2 which proceeds in result of MChT and UST treatments. Simultaneously it was shown that between the values of rate constant and degree of drug decomposition and specific surface of the samples the god correlation observed for all drugs: an increase of activity with specific surface area increase, last proceeds as result of samples treatment. The values of effective rate constant (rate constant determined to weight quantity of TiO2 or WO3 oxide in mixture) were analyzed. An essential increase of effective rate constant determined to quantity of TiO2 in mixture (practically in ten times) after mixture oxides treatment was established. It has been suggested that the presence of heterojunction in this system after its treatment determines an increase of photoactivity of the sample in the grugs decomposition in water solution.
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