Preparation of PMMA/GO and PMMA/GO-Fe3O4 nanocomposites for malachite green dye adsorption: Kinetic and thermodynamic studies

The adsorption performances of as prepared poly(methyl methacrylate)/graphene oxide-Fe3O4 (PMMA/GOFe(3)O(4)) and poly (methyl methacrylate)/graphene oxide (PMMA/GO) nanocomposite as adsorbents were investigated for malachite green (MG) dye removal. For MG dye adsorption on PMMA/GO and PMMA/GO-Fe3O4 nanocomposite, 35 min was selected as the best contact time because there was no main change after 35 min. Optimum adsorption of the dye by both adsorbents occurred at 298 K. The calculated values of the entropy (Delta S degrees), enthalpy (Delta H degrees) and Gibbs energy (Delta G degrees) indicated that the adsorption process was exothermic in nature. The results indicated that PMMA/GO and PMMA/GO-Fe3O4 were good adsorbents for removing MG dye from aqueous solution and were good construed with the pseudo-second-order type (I) due to the law value for chisquare (X-2) and high value of the correlation coefficients.