55th Inaugural Lecture - 2007 by Prof. O. Akaranta - University of ...

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substrate is in the following decreasing order: Pb 2+ > Cd 2+ =Ni 2+ > Zn 2+ > Ca 2+ > Hg 2+ > Mn 2+ . Some of the metal ionsstudied showed an unusual ion exchange pattern. This may bedue to the extent of dissociation of their salts and probably dueto the degree of stability of the high molecular weight formedbetween the metal ion and the tannin molecules of the redonion skin (Odozi and Emelike, 1985).Composite Polymerised Agricultural ResiduesMost studies on the use of agricultural residues in thetreatment of industrial effluents have treated each agriculturalresidue type as an independent entity. As a result manyagricultural residue concentrations are deemed too small tosupport commercial waste conversion processes. However, ifagricultural residues from dissimilar sources are combined theproblem may be overcome. To this end, Odozi et al (1985)developed composite resins of corncob, sawdust, red onionskin and formaldehyde with excellent exchange capacities formetal ions in effluents.The use of composite polymerised agricultural residuesin the treatment of industrial effluents will lead to the28
development of a number of cheap and effective value – addedproducts for the removal of toxic metal ions and organicpollutants in effluents.Dye Treated Agricultural ResiduesRice husks treated with different reactive dyes were effectivein removing various metal ions in both batch and columnprocesses (Suemitsu et al, 1986). Coconut pollens treated withreactive dyes have been reported to show similar enhancedremoval of metal ions from industrial effluents (Agiri et al,2006). Low et al (1993) studied the effect of pH, initialconcentrations, presence of other metal ions and chelatingagents on the exchange capacity and efficiency of dye – treatedoil palm fibres in removing metal ions from electroplatingeffluents. The results showed that reacting oil palm fibres withreactive dyes has a pronounced effect on metal ion sorptionproperties of the substrate.29
Page 1 and 2: UNIVERSITY OF PORT HARCOURTAGRO WAS
Page 3 and 4: The Vice - Chancellor, Sir,Members
Page 6 and 7: Table 1: Residues from the Processi
Page 8 and 9: usually used in the production of s
Page 10 and 11: Orange Seed and Peel OilsAll seeds
Page 12 and 13: satisfied International Standards O
Page 14 and 15: Figure 2:A Red Onion Skin Extract A
Page 16 and 17: of lignocellulosic materials for ch
Page 18 and 19: Pentosan an aldopentose furfural(in
Page 20 and 21: HOHOOH + ClCH 2COONaalkalinesolutio
Page 22 and 23: peel has been reported as a good po
Page 24 and 25: with superphosphates and used as co
Page 26 and 27: (Azbar et al 2004). The methods inc
Page 28 and 29: polymerized onion skin is highly ef
Page 32 and 33: Figure 3: A Schematic Representatio
Page 34 and 35: alternatives to the non-renewable r
Page 36 and 37: into our environment. The guideline
Page 38 and 39: CONCLUDING REMARKSMr. Vice - Chance
Page 40 and 41: REFERENCESAdebowale, E.A (1985), No
Page 42 and 43: Akaranta, O. and Anusiem, A.C. I. (
Page 44 and 45: Halliday, D. (1975), Animal Blood a
Page 46 and 47: Thickeners in Latex Paints, Carbohy
Page 48 and 49: Critical Review on Current Treatmen

55th Inaugural Lecture - 2007 by Prof. O. Akaranta - University of ...

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