Adsorption Efficiency, Kinetic and Isotherm Studies for Lead Ion Using Unmodified-Chitosan Extracted from Waste Shells of Tagelus Plebeiu , Oyorokotor, Rivers State, Nigeria
Abstract
This study was conducted by using chitosan extracted from the waste shells of Tagelus plebeiu in the removal of lead ions from water. Flame Atomic Absorption Spectrophotometer by Buck Scientific VGP 210 was used for the detection of lead concentration. Batch adsorption method was adopted to check the effect of pH, dosage, contact time, temperature and varied concentration of the aqueous solution in the removal of lead ion from water. The results showed 61.84% removal and 3.7104 mg/g adsorption capacity at optimum pH of 8.5, 60.3% and 1.878 mg/g at a dose of 2g, 56.7% and 3.606 mg/g at a contact time of 90min, 64.7% and 6.1128mg/g at 100mg/L and 61.5816% and 3.694896 mg/g at temperature of 303K. Experimental data favored Pseudo-second order model with R2 value of 0.9962. Maximum adsorption capacity was recorded as 6.3532mg/g with experimental result best fitted to the Langmuir model with R2 value of 0.988 showing that surface was monolayer. The enthalpy, entropy and Gibb’s free energy changes were recorded as 18073.8046kJ/mol, 35.9023462kJ K/mol and 7374.90543 kJ/mol indicating that adsorption was favorable. It was concluded that chitosan extracted from waste shells of Tagelus plebeiu was a good adsorbent for lead ion removal from water.
Keywords
ChitosanLeadWastewaterTagelus plebeiuOyorokortor
References
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