Removal of Pb(II) and Cd(II) ions from aqueous solutions with slected organic wastes
 
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AGH University of Science and Technology, Faculty of Mining and Geoengineering, Al. Mickiewicza 30, 30-059 Cracow, Poland
2
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Al. Mickiewicza 30, 30-059 Cracow, Poland
CORRESPONDING AUTHOR
Agnieszka Bożęcka   

AGH University of Science and Technology, Faculty of Mining and Geoengineering, Department of Environmental Engineering and Mineral Processing, al. Adama Mickiewicza 30, 30-059 Kraków, Poland
Publication date: 2016-01-01
 
Physicochem. Probl. Miner. Process. 2016;52(1):380–396
 
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ABSTRACT
The authors investigated sorption of Pb(II) and Cd(II) ions from aqueous solutions on selected natural wastes: sunflower hulls, walnut shells and plum stones. The chemical and physical structure of the surface of these sorbents was determined using infrared spectrometry and scanning electron microscopy. The most favourable physicochemical parameters of the sorption processes were also defined. The sorption of Pb(II) and Cd(II) ions was described according to the Langmuir and Freundlich models. It has been shown that the adsorbents studied can be effectively used in removing heavy metals from aqueous solutions. The sunflower hulls have the highest sorption capacity for Pb(II) and Cd(II) ions. It is equal to 36.93 mg/g for the Pb(II) ions and 19.93 mg/g Cd(II) ions. The calculated values of thermodynamic functions indicate a spontaneous (ΔGº< 0) and exothermic (ΔHº< 0) nature of the sorption processes. A participation of ion exchange in these processes is significant. Desorption tests confirm that the adsorbed heavy metals can be recovered and the sorbent materials after regeneration can be reused.
eISSN:2084-4735
ISSN:1643-1049