Role of titanium dioxide (TiO2) structural design/morphology in photocatalytic air purification

[Display omitted] •Seven different TiO2 photocatalyst morphologies were synthesized via hydrothermal method.•Photocatalysts were thoroughly characterized and morphological evolutions were proposed.•TiO2 nanosheets and hollow spheres exhibited the highest performance for air purification.•Nanosheets high percentage of [001] facet and co-presence of [001] and [101] facets led to high activity. Seven TiO2 morphologies were synthesized and evaluated for photocatalytic oxidation (PCO) of methyl ethyl ketone (MEK) in air. Photocatalysts were fabricated via hydrothermal method and the preparation parameters were adjusted to keep the variations in photocatalysts’ crystallinity, crystal composition, and surface area in narrow ranges, thus, allowing a better understanding of the morphology-performance relationship. Based on the characterization results and data available in literature, possible morphological evolutions for different structures were put forward. MEK removal efficiency improved in the order of solid spheres