Abstract
Combinations of TiO2 photocatalysts and various adsorbents have been widely studied for the adsorption and photocatalytic decomposition of gaseous pollutants such as volatile organic compounds (VOCs). Herein, a TiO2-zeolite-porous glass composite was prepared using melt-quenching and partial sintering, hydrothermal treatment, and drop coating for preparation of the porous glass support and X-zeolite and their combination with TiO2, respectively. The obtained composite comprised anatase phase TiO2, X-zeolite, and the porous glass support, which were combined at the micro to nanometer scales. The composite had a relatively high specific surface area of approximately 25 m2/g and exhibited a good adsorption capacity for 2-propanol. These data indicated that utilization of this particular phase-separated glass as the support was appropriate for the formation of the bulk photocatalyst-adsorbent composite. Importantly, the photocatalytic decomposition of adsorbed 2-propanol proceeded under UV light irradiation. The 2-propanol was oxidized to acetone and then trapped by the X-zeolite rather than being released to the atmosphere. Consequently, it was demonstrated that the micrometer-scaled combination of TiO2 and zeolite in the bulk form is very useful for achieving both the removal of gaseous organic pollutants and decreasing the emission of harmful intermediates.
Highlights
Various atmospheric pollutants in the environment continue to cause considerable problems
Structure, while that for the TiO2-coated composite sample (Figure 1d) exhibited the diffraction peak for anatase TiO2 in addition to those for the X-zeolite, the intensities of the latter peaks were slightly decreased. These results indicated that the X-zeolite precipitated following hydrothermal treatment and remained in the composite following the TiO2 coating process
A TiO2-zeolite-porous glass composite was prepared using melt-quenching for the glass preparation, hydrothermal treatment for the synthesis of the X-zeolite, and drop coating for deposition of the TiO2 thin film
Summary
Various atmospheric pollutants in the environment continue to cause considerable problems. Studies have been reported on the combination of TiO2 photocatalysts with ceramic supports [12,13,14,15,16], porous glasses and glass fiber [17,18,19,20,21], activated carbon [22,23,24,25,26] and graphene [27,28,29,30], silica gel [31,32,33,34,35] and other mesoporous materials [36,37,38,39,40] Zeolites are another important category of effective adsorbents that have been combined with TiO2. The crystalline phases and microstructures of the obtained TiO2-coated zeolite-porous glass composites were characterized and their ability to adsorb and photocatalytically decompose 2-propanol was examined
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