A kind of magnetic Ni based N doped multi walled carbon nanotubes(Ni-NMCNTs),with large specific surface area,were prepared by high temperature calcination.The morphology and structural changes of the material before and after adsorption were characterized,and its adsorption mechanism was further explored.Results showed that this magnetic Ni-NMCNTs with hollow tubular structure exhibited good adsorption capacity and reusability for BPA,and the presence of pyridine nitrogen in the material provided adsorption defect sites and enhanced π-π conjugation,which layed the foundation for improving adsorption performance.Experiments showed that acidic conditions are more conducive to the adsorption of BPA by Ni-NMCNTs.At ambient 25 ℃ conditions,the maximum adsorption capacity could reach 8364 mg/g and the adsorption percentage of BPA could reach up to 868%in 15 min when the dosage was 20 mg and pH value was 60.The adsorption process was in general agreement with the pseudo second order kinetic equation and Freundlich adsorption isotherm model.The thermodynamic parameters demonstrated that the whole adsorption process was spontaneous.