Green Synthesis
of CdS Nanoparticles and their Potential Application towards Adsorption of Lead
and Cadmium ions
Tamil Elakkiya G., Chandrasekhar R. and Sundararajan G.
Res. J. Chem. Environ; Vol. 27(11); 72-81;
doi: https://doi.org/10.25303/2711rjce072081; (2023)
Abstract
Watermelon rind aqueous extract mediated synthesis of CdS nanoparticles was investigated
for its efficiency towards removal of lead and cadmium ions from aqueous solutions.
Batch adsorption investigations were performed to optimise the experimental conditions.
The optimised conditions were found to be pH 6, 1 g L-1, 30 min and 303 K respectively
for the removal of lead and cadmium ions. The equilibrium data obtained was analysed
with isotherm models and it was found that Langmuir and Freundlich isothersm explain
better and the loading capacities were found to be 332.2 and 318.7 mg L-1 respectively
for Pb2+ ad Cd2+ ions.
Kinetic investigations suggest that pseudo second order kinetic model fits well
to the experimental data suggesting that chemical reactions govern the rate limiting
step. The spontaneous and exothermic nature of the present process was successfully
demonstrated by the thermodynamic investigations. Desorption and regeneration studies
suggest that the CdS nanoparticles can be successfully regenerated 5 times and reused
in the adsorption process.
