Abstract
The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried biomass (Urtica dioica leaves) is discussed in the present study. The effect of variation of contact time, adsorbent dose, pH, concentration of metal ions and temperature on biosorption of metal ion is studied. Maximum adsorption was recorded for initial metal ion concentration of 10 mg/l, adsorbent dose of 2 gm, at pH 5 with 60 minutes of contact time for Lead and Zinc, 45 minutes of contact time for Copper ion. The equilibrium conditions were well described by Langmuir, Freundlich and Temkin isotherm equations. The Langmuir isotherm model have provided a better fit with the experimental data compared to that of Freundlich and Temkin isotherm models. The values of thermodynamic parameters indicate that the adsorption reactions were spontaneous, feasible and exothermic.
Highlights
IntroductionThe discharge of industrial waste-waters containing heavy metals is increasing due to rapid industrialization
The discharge of industrial waste-waters containing heavy metals is increasing due to rapid industrialization. It requires serious consideration because heavy metals at high concentrations are toxic to aquatic eco-system causing harmful effects to living organisms, plants and humans [1]
The Urtica dioica biomass as a low cost adsorbent is used for the removal of copper zinc and lead from the synthetic waste water
Summary
The discharge of industrial waste-waters containing heavy metals is increasing due to rapid industrialization. It requires serious consideration because heavy metals at high concentrations are toxic to aquatic eco-system causing harmful effects to living organisms, plants and humans [1]. Heavy metals such as lead, copper, zinc and nickel are among the most common pollutants found in industrial effluents. The permissible limits for industrial effluents discharge set by the World Health Organization (WHO) [12] are 5-15mg/l for Zn, 0.05-1.5mg/l for Cu and 0.1 mg/l for Pb
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