Algerian Journal of Materials Chemistry
Volume 3, Numéro 2, Pages 48-60

Adsorption Of Nickel (ii), Cadmium (ii) And Lead (ii) From Aqueous Solution Using Chitosan / Raphia Palm Composite

Authors : Paul Ocheje Ameh .

Abstract

Adsorption of Cd2+, Ni2+ and Pb2+ from aqueous solution by chitosan / raphia palm activated carbon composite (CRPAC) material prepared in the form of beads have been investigated through batch mode adsorption process. The results obtained indicated that the modification of the chitosan by coating with raphia palm tends to increase the capacity of the chitosan as an adsorbent. The adsorption of the studied metals onto CRPAC was found to be favoured by Freundlich isotherms and was influenced by pH, contact time, concentration, biomass and dose. The kinetic studies showed that the adsorption followed a pseudo-second-order model with chemisorption mechanism being favoured. Thermodynamic study on the adsorption capacity of the adsorbents indicated that the adsorption is spontaneous ( were negative), endothermic ( values were positive) and occurred with increasing degree of orderliness rather than disorderliness.

Keywords

Adsorption, chitosan, raphia palm, polymer, water pollution