Sorption of calcium ion from the hard underground water using novel oxidized graphene (GO) sheets
was studied in this paper. Physicochemical properties and
microstructure of graphene sheets were investigated using
Raman spectrometer, thermogravimetry analyzer, transmission electron microscope, scanning electron microscope. The kinetics adsorption of calcium on graphene
oxide sheets was examined using Lagergren first and second orders. The results show that the Lagergren secondorder was the best-fit model that suggests the conception
process of calcium ion adsorption on the Go sheets. For
isothermal studies, the Langmuir and Freundlich isotherm
models were used at temperatures ranging between 283 and
313 K. Thermodynamic parameters resolved at 283, 298
and 313 K indicating that the GO adsorption was
exothermic spontaneous process. Finally, the graphene
sheets show high partiality toward calcium particles and it
will be useful in softening and treatment of hard water. |
