Biosorptive Removal of Cu(II), Cd(II) and Pb(II) Ions from Synthetic Wastewater Using Low Cost Biosorbent (Pyras pashia): Thermodynamic and Equilibrium Studies

Harish Sharma1,*,, Rajesh Kumar1,*, Mahesh Chandra Vishwakarma2, Sushil Kumar Joshi1 and Narender Singh Bhandari1

1Department of Chemistry, Kumaun University, S.S.J. Campus, Almora-263601, India

2Department of Chemistry, Laxman Singh Mahar P.G. College, Pithoragarh-262501, India

*Corresponding authors: E-mail:;


In present study, Pyras pashia leaves were used as low cost biosorbent to study biosorption of Cu(II), Pb(II) and Cd(II) ions from contaminated wastewater. In the employed batch methods pH, contact time, metal ion concentration, temperature, biosorbent doses were taken as study parameters. The pH was varied from pH 1-9 to study the influence of pH on biosorption of metal ions by Pyras pashia. The optimum pH for the removal of Cu(II), Pb(II) and Cd(II) is observed at pH 5. The biosorption equilibrium time was varied between 15-75 min. Langmuir, Freundlich and Temkin isotherms were employed to study the biosorption. The biosorption parameter fits well with Langmuir isotherm. The biosorption of metal ions was increased with increasing biosorbent dose and contact time while increase in pH, metal ion concentration and temperature decrease the biosorption. Thermodynamic data suggest that the bisorption process was spontaneous, feasible and endothermic.


Pyras pashia, Thermodynamics, Equilibrium, Isotherms, biosorption.

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