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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 11, No. 2, 2007, pp. 153-158
Bioline Code: ja07040
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 11, No. 2, 2007, pp. 153-158

 en Adsorption of Pb, Cd, Zn, Cu and Hg ions on Formaldehyde and Pyridine Modified Bean Husks
Adediran, G.O.; Tella, A.C. & Mohammed, H.A.


Adsorption of Pb(II), Cd(II), Zn(II), Cu(II) and Hg(II) ions on formaldehyde and Pyridine modified bean husks were determined. The adsorption capacity of formaldehyde modified bean husks (mg/g) was: Pb2+, 5.01; Cd2+, 3.63; Zn2+, 2.18; Hg2+, 1.82; Cu2+, 1.58 and that of pyridine modified bean husk was: Hg2+, 6.92; Cd2+, 3.63; Pb2+, 2.64; Zn2+, 2.48; Cu2+, 1.91. The Freundlich equation parameter 1/n for the metal ions were found to be less than unity which indicates that adsorption of metals on bean husks have increased as a result of modification. The calculated value from Freundlich adsorption parameter (KF) and Langmuir adsorption parameter (qmax) showed that the adsorption capacities of the metal ions are in order of Pb2+ > Cd2+ > Zn2+ > Hg2+ > Cu2+ for formaldehyde modified bean husks and Hg2+ > Cd2+ > Pb2+ > Zn2+ > Cu2+ for pyridine modified bean husks. The binding capacity study showed that the formaldehyde modified bean husks could be employed in the removal of Pb2+ and Zn2+ from industrial effluent especially in the battery manufacturing, paints and dyes industries. This study also indicates that the pyridine modified bean husk could remove Hg2+ better than the formaldehyde modified bean husk in the printing and minting industrial effluent.

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