REMOVAL OF TOXIC Cd2+ AND Pb2+ FROM AQUEOUS SOLUTIONS USING AGRO-WASTE (Cola nitida pod) .....

Metals and their compounds are employed extensively in industrial processes, which cannot be overstated. Meanwhile, effluents from industrial processes contain heavy metal ions that have been shown to be detrimental to human and plant health when dumped into the environment untreated. As a result, removing heavy metal ions from industrial effluents before to discharge becomes critical. Cola nitida pod was used to test the removal/adsorption of lead (II) ion and cadmium (II) ion from their aqueous solution. The effects of contact time, first metal ion concentration, starting pH, adsorbent dosage, 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 is 0.1-0.7 g, and the temperature is 303-333 K. The equilibrium time was discovered to be around 60 minutes. The percentage of Pb2+ and Cd2+ removed from their aqueous solutions by the adsorbent (Cola nitida pod) was found to be above 90%. Changes in the initial metal ion concentration, initial pH, adsorbent dose, and temperature affected the percentage removal of lead (II) and cadmium (II) ions by the test adsorbent. The adsorption mechanisms of the metal ions on the test adsorbent were investigated using Langmuir and Freundlich adsorption isotherms, and the adsorption of both Pb2+ and Cd2+ on Cola nitida pod fit precisely into the adsorption isotherms. The linearized form of both the Langmuir and Freundlich models offers a superior fit for the experimental adsorption equilibrium data and the most appropriate isotherm to represent the equilibrium data for lead and cadmium, hence Langmuir adsorption is suggested for Pb2+ and Cd2+ adsorption research.

Please see the link :- https://www.ikprress.org/index.php/JACSI/article/view/3583