Sorption of Pb(II), Cd(II), and Ni(II) Toxic Metal Ions by Alginate-Bentonite

Teoh Wah Tzu, Takuma Tsuritani, Kazunori Sato

Department of Environmental Engineering, Nagaoka University of Technology, Nagaoka, Japan.

DOI: 10.4236/jep.2013.41B010                

Abstract

The sorption of Pb(II), Cd(II), and Ni(II) toxic metal ions from aqueous solution by composite alginate-bentonite and alginate was investigated. The affinity and sorption capacity of the toxic metal ions for both type of samples were evaluated. The Langmuir maximum sorption capacity for each toxic metal ion increased for alginate-bentonite as compared to alginate. However, affinity for toxic metal ion remained unchanged for both alginate-bentonite and alginate in the order of Pb(II) > Cd(II) > Ni(II). Alginate-bentonite also shortens the duration required for complete sorption. Elementary mapping analysis depicts the gradient diffusion of toxic metal ions into the centre of alginate-bentonite beads indicated that sorption was contributed by surface adsorption and diffusion.

Keywords

Toxic metals; Alginate; Bentonite; Wastewater

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	S. Kubilay, R. Gurkan, A. Savran, T. Sahan, “Removal of Cu(II), Zn(II) and Co(II) ions from aqueous solution by adsorption onto natural bentonite”, Adsorption, Vol. 13, 2007, pp. 41-51.
[2]	G. Bereket, A.Z. Aroguz, M.A. Ozel, “Removal of Pb(II), Cd(II), Cu(II), and Zn(II) from aqueous solutions by adsorption on bentonite”, J. Colloid Interface Sci., Vol. 187, 1997, pp. 338-343.
[3]	F.A. Abu Al-Rub, M.H. El-Naas, F. Benyahia, I. Ashour, “Biosorption of nickel on blank alginate beads, free and immobilized algal cells”, Process Biochem., Vol. 39, 2004, pp. 1767-1773.
[4]	H. Katircioglu, A. Aslim, A.R. Turker, T. Atici, Y. Beyatli, “Removal of cadmium(II) ion from aqueous system by dry biomass, immobilized live and heat-inactivated Oscillatoria sp. H1 isolated from fresh-water (Morgan Lake)”, Bioresource Technol.,Vol. 99, 2008, pp. 4185-4191.
[5]	B. Amsden, N. Turner, “Diffusion Characteristic of calcium alginate gel”, Biotechnol. Bioeng., Vol. 65, 1999, pp. 605-610.
[6]	E. Eren, A. Afsin, “An investigation of Cu(II) adsorption by raw and acid activated bentonite: A combined poten-tiometric, thermodynamic, XRD, IR, DTA study”, J. Hazard Mater., Vol. 151, 2008, pp. 682-691.
[7]	S. K. Papageorgiou, F. K. Katsaros, E. P. Kouvelos , J. W. Nolan, H. L. Deit, N. K. Kanellopoulos, “Heavy metal sorption by calcium alginate beads from Laminaria digitata”, J. Hazard Mater., B137, 2006, pp. 1765-1772.