Kinetic, equilibrium and thermodynamic studies for the removal of lead ions from aqueous solutions by using low cost adsorbents: a comparative study
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 7
Abstract
Adsorption and desorption of Pb(II) on two natural minerals (natural calcite and eggshell) were studied. The ability of the natural materials in removal of Pb(II) from aqueous solutions had been examined in a batch adsorption process with respect to several experimental conditions including initial solution pH, contact time, initial metal ion concentration, temperature and adsorbent concentration. The absorption isotherms showed that the adsorption capacity of substrates varied as follows: natural calcite>eggshell. Desorption kinetics show a complete hysteresis testify to the irreversibility of the bonds formed between Pb and the substrates. Thus, the uptake of lead was reproduced by a cation exchange model and by a surface complexation model for the mineral-aqueous solution interface. The thermodynamic study demonstrated that lead adsorption is endothermic for both adsorbents. It is spontaneous and non-spontaneous for natural calcite and eggshell, respectively. All these results indicate that eggshell and natural calcite could be employed as efficient low-cost and eco-friendly adsorbents for lead removal from industrial wastewaters.
Authors and Affiliations
Sabah Hajji, Nadia Mzoughi
Keywords
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