Studies on Removal of Toxic Cd2+ and Pb2+ from Aqueous Solutions by Using Agro-waste (Cola nitida Pod)

Industrial processes and used commercial (metallic) products generate a large amount of metallic waste, which is discharged into the environment via water or land-dumping sites. It is estimated that the toxicity of metallic discharge into the environment far outweighs the total toxicity of all radioactive and organic wastes combined. The importance of metals and their compounds in industrial operations cannot be overstated. Meanwhile, industrial effluents contain heavy metal ions that have been reported to be harmful to human and plant health when discharged untreated into the environment. As a result, removing heavy metal ions from industrial effluents prior to discharge becomes critical. The removal/adsorption of lead (II) ion and cadmium (II) ion from aqueous solution by Cola nitida pod was studied. The effects of contact time, initial metal ion concentration, initial pH, adsorbent dose, and temperature on metal ion removal were investigated for contact times ranging from 15 to 90 minutes and initial metal ion concentrations ranging from 50 to 200 mg/l. The pH range is 5-8, the adsorbent dose range is 0.1-0.7 g, and the temperature range is 303-333 K. The equilibrium time was discovered to be in the range of 60 minutes. Pb2+ and Cd2+ removal percentages from aqueous solutions pod) was discovered to be greater than 90%. Changes in initial metal ion concentration, initial pH, adsorbent dose, and temperature all had an effect on the percentage removal of lead (II) ion and cadmium (II) ion by the test adsorbent. The adsorption mechanisms of the metal ions on the test adsorbent were examined using Langmuir and Freundlich adsorption isotherms, and the adsorption of both Pb2+ and Cd2+ on Cola nitida pod fit perfectly into the adsorption isotherms. When the correlation coefficients (R2) of the linearized forms of the Langmuir and Freundlich models are compared, it is clear that the Langmuir model provides a better fit for the experimental adsorption equilibrium data and is the most appropriate. isotherm to describe the equilibrium data for lead and cadmium, and thus Langmuir adsorption is recommended for Pb2+ and Cd2+ adsorption studies. The contrast of The correlation coefficients (R2) of the linearized forms of the Langmuir and Freundlich models show that the Langmuir model fits the experimental adsorption equilibrium data better and is the most appropriate isotherm to describe the equilibrium data for lead and cadmium.

Author (S) Details

N. E. Ibisi
Department of Chemistry, College of Physical and Applied Sciences, Michael Okpara University of Agriculture Umudike, P.M.B 7267, Umuahia, Abia-State, Nigeria.

H. Ozioko
Department of Chemistry, College of Physical and Applied Sciences, Michael Okpara University of Agriculture Umudike, P.M.B 7267, Umuahia, Abia-State, Nigeria.

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