Synthesis of BiVO₄/TiO ₂ composites and evaluation of their photocatalytic activity under indoor illumination

Longo, Giulia; Fresno, Fernando; Gross, Silvia; Štangar, Urška Lavrenčič

Synthesis of BiVO₄/TiO ₂ composites and evaluation of their photocatalytic activity under indoor illumination

2014

Longo, Giulia | Fresno, Fernando | Gross, Silvia | Štangar, Urška Lavrenčič

BiVO₄/TiO₂ composites with different weight ratios have been prepared by coprecipitation-based reactions followed by either thermal or hydrothermal treatment with the aim of evaluating the TiO₂ photosensitization by BiVO₄. The obtained materials present in all cases the desired monoclinic phase of BiVO₄ and anatase phase of TiO₂. Visible light absorption increased with increasing amount of bismuth vanadate. XPS results reveal the surface enrichment of Ti with respect to the bulk composition in samples characterised by a higher content of BiVO₄. The photocatalytic activity of the prepared materials was tested for the degradation of isopropanol in the gas phase under indoor illumination conditions. Although none of the composites was able to improve the activity of TiO₂, the low BiVO₄ containing samples appear as more suitable for further synthesis tuning.

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