Graphene oxide-manganese ferrite (GO-MnFe₂O₄) nanocomposite: One-pot hydrothermal synthesis and its use for adsorptive removal of Pb²⁺ ions from aqueous medium

Herein, we showed that the graphene oxide with manganese ferrite (GO-MnFe₂O₄) possess great adsorption properties for the selective Pb²⁺ ions removal from the aqueous medium. Nanocomposite adsorbent was developed by one-pot hydrothermal method, using graphene oxide as a supporting material to minimize the aggregation of MnFe₂O4. Also, GO possesses important role in the adsorption mechanism of Pb²⁺ through electrostatic/ionic interactions. The characterizations such as FT-IR, XPS, P-XRD, FE-SEM, and BET of the synthesized nanocomposite were carried out to assess the different properties such as functionalities, crystallinity, morphology, and surface area value, respectively. Thereafter, the adsorption performance of GO-MnFe₂O₄ nanocomposite was tested for the Pb²⁺ at various adsorption parameters including to contact time, solution pH, adsorbent dose, and concentration of initial Pb²⁺ in order to measure the optimum adsorption condition. Kinetic experiments suggest that the equilibrium attained in 30 min and followed a pseudo-second-order kinetic model. Adsorption isotherm model followed to Langmuir isotherms and gives a maximum adsorption capacity of 621.11 mg/g. The reusability tests exhibited good durability and good efficiency for repeated Pb²⁺ adsorptions with GO-MnFe₂O₄ nanocomposite. These results demonstrated that the GO-MnFe₂O₄ nanocomposite may be an attractive adsorbent having low-cost for the effectively Pb⁺² removal of from the polluted water.