Biocompatible G-Fe3O4/CA nanocomposites for the removal of Methylene Blue

Abstract Novel graphene based composites were prepared by encapsulating magnetic graphene (G-Fe 3 O 4 ) into calcium alginate (CA). The obtained graphene-Fe 3 O 4 /CA composites were further applied as adsorbent for the removal of Methylene Blue (MB). Adsorption of MB onto G-Fe 3 O 4 /CA was investigated with respect to pH, adsorption time, initial MB concentration and temperature. Kinetics data and adsorption isotherm obtained at pH 7 were better fitted by pseudo-second-order kinetic model and by Langmuir isotherm, respectively. The values of activation parameters such as free energy (ΔG, − 3.88 to − 7.64 kJ mol − 1 ), enthalpy (ΔH, 51.24 kJ mol − 1 ) and entropy (ΔS, 188.06 J mol − 1  K − 1 ) were calculated, indicating that the adsorption was spontaneous, favorable and an endothermic process in nature. The results suggest that the G-Fe 3 O 4 /CA composites are potential and suitable materials in the preconcentration of organic dyes from large volumes of wastewater.

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