In this paper, the amine-functionalized magnetite hollow nanospheres (AMHNs), prepared through a facile one-pot synthesis, used as heavy metal ions adsorbents, whose morphology and physicochemical features were exploring by transmission electron microscopy, VSM, X-ray diffraction and Fourier-transform infrared analyses. Its adsorption performances for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were studied in detail. The adsorption ameliorated with the increase of initial pH value of the solution and could be affected by ionic strength obviously. Besides, the adsorption kinetics and isothermals were studied. The adsorption processes of Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ could all reach equilibrium in 60 min and be described well by the Langmuir thermodynamics model. The saturated adsorption capacities of Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were 0.66 mmol/g, 0.47 mmol/g, 0.45 mmol/g, 0.38 mmol/g and 0.26 mmol/g, respectively. In addition, the competitive adsorption showed the AMHNs had higher affinity to Pb2+ than to other heavy metal ions.
- adsorption isothermals
- adsorption kinetics
- competitive adsorption
- heavy metal ions
- magnetite hollow nanospheres
- First received 2 November 2016.
- Accepted in revised form 4 April 2017.
- © IWA Publishing 2017