Magnetic carbon nanotubes synthesis by Fenton's reagent method and their potential application for removal of azo dye from aqueous solution

► We have reported a simple and easy method to fabricate magnetic carbon nanotube absorbents (MAs). ► MAs have good adsorption capacity of dye and could be separated by an external magnetic field. ► A photocatalytic regeneration technology was introduced based on nanoscale iron oxide loading.