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The present work deals with the removal of cadmium from water using
lemon peel and green coconut shell powder in batch
reactor.Characterization of the biosorbents has been carried out
through proximate and ultimate analysis, FTIR, SEM, EDAX etc. The
influence of initial cadmium concentration, pH, adsorbent dose,
time and temperature on the removal of cadmium has been
investigated to find out the optimum process conditions. Analysis
of kinetic data shows that the initial adsorption of cadmium is
rapid for both the biosorbents, however, equilibrium agitation
period is about 5 h for lemon peel and 3 h for green coconut shell
powder. The adsorption process for both the biosorbents follows
pseudo second order kinetic model. Langmuir isotherm model gives
better prediction on adsorption equilibrium than Freundlich
isotherm model. The Langmuir maximum adsorption capacity (qmax) for
lemon peel and green coconut shell powder is found to be 11.24 mg/g
and 14.49 mg/g respectively. The values of thermodynamic parameters
such as Gibb's free energy change ( G ), enthalpy change ( H ) and
entropy change ( S ) for these experiments indicate the spontaneous
and exothermic nature of the processes.
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