Biosorption of Cd (II), Pb (II) and Zn (II) from Aqueous Solutions using Garden Egg (Solanum Melongena) Leaf: Equilibrium, Kinetics and Thermodynamics

The prevalent problems associated with heavy metal contamination of the environment particularly underground and surface wastewater compel need to work on economical means mitigating accumulation metals in by espousing biosorption option. choice this regard is hinged overall cost control process its relative effective outcome compared other diminishing environment. Thus, potential Garden Egg (Solanum melongena) Leaf (GEL) remove Cd(II), Pb(II) Zn(II) from aqueous solutions through was studied. influence various parameters such as pH, contact time, biomass dose initial ion concentration investigated using batch experiments determine efficiency biosorbent. presence ionizable functional groups (-N-H,-C≡N, C=O –C-O) GEL were analyzed Fourier Transform Infrared (FT-IR) which are responsible for binding cations. heat sorption estimated Temkin Isothermal model mean free energy Dubinin-Radushkevich (D-R) model. revealed that best pH adsorption at 7. kinetic studies showed represented pseudo-second order kinetics having highest correlation coefficient (R2) 0.9398, 0.9339 0.9398 respectively, among models tested. Equilibrium data better Freundlich isotherm Langmuir, Freundlich, Dubinin–Radushkevich (D–R) absorption isotherms. appeared have regression coefficients four study effect dosage significantly affected uptake ions solution. Thermodynamically, each endothermic spontaneity being Zn > Pb Cd. However, positive change entropy observed disorder Cd Pb. results indicate egg leaf has a Cd(ll), Pb(ll) Zn(ll) could be found useful treatment industrial effluents. Keywords: Biosorption; Heavy metals; Effluents; egg; Thermodynamics; Kinetics.