Latest developments on TiO2-based photocatalysis: a special focus on selectivity and hollowness for enhanced photonic efficiency

Preparation of Visible-Light Active Oxygen-Rich TiO2 Coatings Using Low Pressure Cold Spraying

“…Most cold-sprayed TiO 2 coatings concern commercially available crystalline TiO 2 feedstocks [19,20]. The most typical among them is Degussa (Evonik) P25, which is a mixture of rutile and anatase in a proportion of one to four [1,2]. Until now, we did not manage to find any successful approach to spray pure P25 without additions using the cold spray.…”

“…The formation of TiO 2 photocatalytic coatings has been a constant challenge over the past 30 years [1][2][3]. During this time, titanium dioxide has remained one of the most photocatalytically efficient and highly stable materials, and stayed at a low price.…”

“…What was not prioritized yet, is to consider the internal atomic structure and surface chemistry of the deposited powders. The wide bandgap of unmodified TiO 2 (approximately 3.0 eV for rutile and 3.2 eV for anatase) means that to obtain the activation energy for photocatalytic reactions, ultraviolet light is needed [1,2]. However, UV only constitutes ~5% of the solar energy that reaches the surface of Earth.…”

Metal–organic framework heterojunctions for photocatalysis

“…[1][2][3][4][5] The limitations encountered in most of the photocatalysts in terms of unsatisfactorily low activity have been tried to be overcome mostly by exploring new materials and, in this way, the types of photoactive materials have expanded rapidly. [6][7][8][9] Besides bare inorganic semiconductors and organic photosensitizers, 10 hybrid inorganic-organic materials have also attracted much attention. In particular, metal-organic frameworks (MOFs) have emerged as one of the most versatile photocatalysts.…”

Photoactive Graphene Aerogel from Biomass for the Visible-Light-Induced Degradation of Pharmaceutical Residues

“…Photocatalysis is quite promising for complete mineralization of organic contaminants and pharmaceuticals without the involvement of any toxic compounds. ,− Nano-carbon-based photocatalyst can degrade pharmaceuticals in visible light by the photoexcited electron–hole pairs without the addition of any chemicals in a cost-effective manner. , Separation and recycling of the photocatalyst from an aqueous medium is a practical problem. , Self-standing catalysts with high hydrophobicity in the form of solid chunks may play a significant role in their easy separation without the generation of secondary contamination in water. To overcome the obstacles of separation and recycling from aqueous systems, the three-dimensional (3D) macrostructure of graphene in graphene aerogels (GAs) has been gained substantial attention in photocatalytic applications .…”