Sonochemical fabrication of novel square-shaped F doped TiO2 nanocrystals with enhanced performance in photocatalytic degradation of phenol

► Novel F doped square-shaped TiO2 nanocrystals were fabricated using sonochemical method. ► Mesoporous structure was induced by ultrasound-induced aggregation effect. ► The photocatalytic properties were studied by phenol degradation. ► F doped TiO2 nano-squares show superior photocatalytic activity.