Titania is considered the most appropriate candidate for photocatalytic processes due to its powerful oxidation capability, superior charge transport, and corrosion resistance. Despite these attributes, the efficiency of TiO2 for photovoltaic and photocatalytic applications is severely limited by its large bandgap (~3.2 eV) and rapid charge carrier recombination dynamics. This means that anatase titania uses less than 1% of the solar spectrum. However, Au, Au-Pt nanoparticles and quantum dots can be utilized to sensitize TiO2 and extend its photo-response to the visible region of the solar spectrum. In this presentation we bring to light recent advances in our laboratory on synthesis, characterization, optical and physico-chemical properties of active nanohybrid titania-based catalysts with multifunctional, broadband electromagnetic responses for potential solar energy conversion applications. Molecular self-assembly and co-deposition procedures are employed to modify the TiO2 surface and create nanohybrid structures. The catalytic potential of the newly produced nanohybrid materials toward the photodegradation of a model analyte, methyl orange, is studied under UV and visible illumination. The photocatalytic performance of these nanomaterials is highly dependent upon nanoparticle shape, morphology, composition, crystallinity, and illumination and will be described in detail.

Rational design and assembly of titania-based nano-photocatalysts for environmental and energy related applications

243rd National Meeting (2012)

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