Study on the Adsorption of Dyes in Water by Fe3O4@SiO2/PEI Modified Graphene Oxide
In this study,Fe3O4@SiO2/PEI modified graphene oxide magnetic composite material(MSPG)was utilized to remove anionic and cationic dyes from aqueous solutions.The maximum adsorption capacities for Methyl Orange(MO),Congo Red(CR),and Methylene Blue(MB)were found to be 233.5 mg/g at pH 4.0,213.5 mg/g at pH 6.0,and 99.89 mg/g at pH 10.0,respectively.The adsorption processes of CR and MB by MSPG were more consistent with the Freundlich isotherm model,whereas the adsorption of MO by MSPG followed the Langmuir isotherm model.Furthermore,the enthalpy change(ΔH°)values for the adsorption of MO,CR,and MB by MSPG were positive,while the Gibbs free energy change(ΔG°)values were negative,indicating that the adsorption processes were endothermic and spontaneous.Compared to Fe3O4@SiO2/PEI,MSPG not only exhibited higher adsorption capacities for the anionic dyes MO and CR but also showed significant adsorption for the cationic dye MB.This demonstrates that the incorporation of graphene oxide(GO)significantly enhances the ability of MSPG to remove CR and MB,indicating its broader applicability in practical applications.
Magnetic Composite MaterialsGraphene Oxidedyesadsorption removal
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