Abstract
In this study, the technical feasibility of using a low-cost sorbent, sheep manure waste (SMW), for the removal of copper, nickel and cadmium ions from aqueous solutions containing Cu2+ --Cd2+ or Cu2+ --Ni2+ binaries is investigated. The scope of the study includes the investigation of the affinity of each metal ion in the presence of the other. Experimental results showed that the SMW has high affinity for the three studied heavy metals, and the affinity of the SMW for these metals is in the order copper > cadmium > nickel. The presence of copper in a solution containing Ni2+ or Cd2+ reduces significantly the percentage removal of both nickel and cadmium. On the other hand, the percentage removal of copper was not affected significantly by the presence of either nickel or cadmium. The equilibrium adsorption data were fit very well with Langmuir, Freundlich, Redlich-Peterson, and Sips isotherm equations. The prediction of the binary adsorption from single metal adsorption data was in fair agreement with the experimental results. The role of ion exchange and carboxyl groups in the adsorption process were also studied.
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