Abstract
The aim of this work was to obtain hybrid photocatalysts by combining micronized β-cyclodextrin (β-CD) with TiO2 (PC500). β-CD was micronized using the supercritical antisolvent technique (SAS) to observe the influence of the solute concentration on the hybrid photocatalysts’ morphology. At all the β-CD concentrations, the photocatalyst was constituted of microparticles (mean diameter=1.6–2.1 µm). The photocatalysts were analyzed by various chemical-physical characterization techniques. In particular, wide angle X-ray diffraction and Raman analyses showed the presence of the anatase phase characteristic of commercial PC500. Moreover, FT-IR spectra highlighted the interaction between β-CD and PC500. Photocatalytic performances are evaluated in the UV-light degradation of Acid Orange 7 azo dye. The addition of micronized β-CD improves the photocatalytic activity of bare PC500. Indeed, the optimized hybrid photocatalyst exhibited the complete color removal and the highest mineralization efficiency (96%) under UV irradiation. In addition, the optimized PC500/CD SAS50 sample proved to be stable and reusable.
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