Ultrasound-assisted synthesis and visible-light-driven photocatalytic activity of Fe-incorporated TiO2 nanotube array photocatalysts

► Fe-TiO2NTs were prepared by an ultrasound-assisted impregnating-calcination method. ► The absorption of TiO2NTs in visible light region was enhanced by incorporating Fe. ► Fe-TiO2NTs exhibited the enhanced visible light photocatalytic activity. ► Fe-TiO2NTs photocatalyst is promising for visible light degradation of wastewater.