Biosorption Efficacy of Biosorbents Prepared from Cocoa Leaves Used for Removal of Lead Polluted Wastewater at Birnin Gwari War Front, Kaduna State

Zainab Hussaina Ibrahim, MD Faruruwa, A. Elebo

Abstract


The potential of Acid Treated (ATC) and Untreated Cocoa Leaves (UTC) biosorbents used for removal of Pb2+ from wastewater at warfront was studied using batch adsorption technique. Atomic Adsorption Spectroscopy (AAS) was used to ascertain the residual Pb2+ concentration after the adsorption process. The optimum operational experimental conditions: adsorbent dose, pH, initial Pb2+ concentration and contact time were obtained. It was found that the percentage sorption of Pb2+ increased with; higher adsorbent doses (0.8-1 g/25cm3), increase in pH levels (7 - 9), increased Pb2+ concentration (between 150 – 200 mg/L) and increased contact time (150 - 180 minutes). The result showed that cocoa leaves have the potential to remove Pb2+ polluted wastewater at about 99.8% removal. The biosorbents were characterized using Fourier Transform Infrared Spectroscopy (FTIR). It showed the presence of O-H, O-CO-, N-N=O and    -C-H are responsible for the adsorption of Pb2+ onto the biosorbents. The adsorption of Pb2+ onto ATC and UTC from wastewater at war front best fitted into Pseudo-Second Order Kinetic Model validated by the coefficient of regression R² values close to infinity. The equilibrium sorption data were fitted best into Freundlich isotherms with R2 value for ATC is 0.5754 and UTC for 0.6441. The maximum monolayer coverage (Qo) from Langmuir isotherm model was determined to be 117.65 mg/g for ATC and 53.35mg/g for UTC. The Freundlich Isotherm model showed the sorption intensity (n) of 0.348 for ATC and 0.1557 for UTC indicated favorable adsorption. 

Keywords


Keywords: Cocoa Leaves, Lead, Biosorption, wastewater, Kinetics, Isotherms

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v23.2.2254

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