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ABSTRACT
In this study, Zinc oxide nano particles synthesized by chemical co-precipitation was used as an adsorbent in the removal of heavy metal irons (Cd 2+ and Ni2+) from contaminated water. Batch adsorption experiment was carried out to examine the effect of contact time, pH, adsorbent dosage and initial concentration on the adsorption of Cadmium and Nickel. The result obtained showed that percentage removal of Cd2+ and Ni2+ from the contaminated water were dependent on contact time, adsorbent dosage, pH and Initial concentration of the adsorbate. The optimum contact time being 60minutes for nickel and 30min for cadmium with pH of 10 and adsorbent dosage of 0.05 gram. The maximum removal efficiency of Cd2+ and Ni2+ under this condition was 66.2% and 58.5% respectively. Langmuir and Freudlich isotherm was utilized to determine the best fit model for Cd2+ and Ni2+ respectively. Using the result obtained, Langmuir model was less suitable for Cd2+ and Ni2+ with regression coefficient (R2 ) being 0.5842 and 0.5824 respectively while the Freudlich model was found to best fit Cd2+ and Ni2+ with the regression coefficient (R2 ) being 0.792 and 0.8412 respectively. The characterization studies was performed using Fourier Transform Infrared Spectrometer (FTIR)
