The new method described herein is based on the homogeneous entrapment of terephthalic acid (TPA) in the polymer host to form a transparent thin solid layer over photocatalyst surface and on highly sensitive fluorescence detection of the one of TPA oxidation products. This method represents a step forward due to several desirable characteristics for the self-cleaning tests: it comprises solid–solid interface, slow oxidation process can be traced in a short time scale, it is quantitative and direct method to follow photocatalytic oxidation process, the TPA layer itself is photostable.
COBISS.SI-ID: 1466619
The modification of titania with zirconia has been found to influence the specific surface area, anatase crystallite sizes and natural hydrophilicity of the sol–gel films, but on photocatalytic activity it did not have a significant positive effect. ZrO2 (10% with respect to TiO2) was found to be homogeneously distributed along the film thickness, presumably in its amorphous modification. The films treated at low temperatures were found to have superior efficiency towards degradation of an azo dye aqueous solution since sufficient crystallinity was developed already during the sol formation.
COBISS.SI-ID: 1104123
Combining TiO2 photocatalysis with inorganic oxidants (such as O3 and H2O2) or transition metal ions often leads to a synergy. In this work we studied the disappearance of thiacloprid, a modern neonicotinoid insecticide, applying various advanced oxidation processes and TiO2 photocatalysts. In photocatalytic ozonation experiments, synergic effect of three different TiO2 photocatalysts was quantified. On the contrary, no synergy was observed in photocatalytic degradation of thiacloprid in the presence of dissolved iron(III) species.
COBISS.SI-ID: 1422587
Ordered and disordered mesoporous silica supports were synthesized and used for incorporation of titania with different Ti/Si molar ratios via sol-gel impregnation method. Different characterization has been carried out to investigate the chemical framework and morphology. The photocatalytic degradation of isopropanol in gaseous medium was selected as a probe reaction to test activity of powders and to verify their potential application for air remediation. It was found that TiO2 source, Ti/Si molar ratio and type of SiO2 support influenced the adsorption capacity and photocatalytic activity.
COBISS.SI-ID: 1545211
The effects of Ti/Si molar ratio and of the mesoporous silica structure were investigated measuring adsorption capacity and photocatalytic degradation of toluene in self-constructed gas reactor system. The adsorption capacity was decreasing as a function of the increasing Ti/Si molar ratio. However, the photocatalytic degradation proceeded faster for the Ti/Si molar ratio 1/1 compared to ratios 1/2 and 2/1. In general, the photocatalytic activity was considerably improved by using supported titania–silica catalyst with regard to an unsupported titania powder prepared from the same titania sol.
COBISS.SI-ID: 1544955