Nanoconfined hydrous titanium oxides with excellent acid stability for selective and efficient removal of As(V) from acidic wastewater

•A millimeter-sized titanium oxide-based nanocomposite Ti-201 was fabricated.•Ti-201 is of the excellent acid resistance and hydraulic property in application.•Ti-201exhibits selective and efficient As(V) removal from acidic solution.•Ti-201 could be effectively regenerated for sustainably utilized with alkaline solution.