Magnetically recoverable photocatalytic nanocomposite particles for water treatment

► Synthesis of magnetically recoverable photocatalyst using a simple method. ► Heteroagglomeration of anatase and maghemite nanoparticles in an aqueous suspension. ► Attractive electrostatic forces between nanoparticles with an opposite electric charge. ► Effective magnetic separation of the nanocomposite from the suspension. ► Improved photocatalytic activity of the anatase when in contact with the maghemite.