Removal of Pb (II) from Aqueous Solution Using Response Surface Methodology with Aminated Magnetic Graphene Oxide Synthesized from Typha Latifolia

Abstract

Today, environmental pollution and less accessibility of freshwater have been a serious challenge due to industrialization and urbanization. Therefore, the aim of this study was to investigate the synthesis of aminated magnetic graphene oxide (m-GO-NH2) from Typha latifolia and its application for Pb (II) removal from aqueous solution. The m-GO-NH2 was synthesized from steam of T. latifolia by using CVD and applied to Pb (II) removal. The structure of synthesized nano adsorbent was characterized by using SEM, FTIR, AFM, Raman spectroscopy and pHZPC. After finding the optimum amount of pH, central composite design was applied to survey the effect of time (X1), initial concentration of Pb (II) (X2) and adsorption dosage (X3) for Pb (II) removal from aqueous solution. Two quadratic models were developed to estimate the amount of Pb (II) removal efficiency with design expert software. According to the SEM, FTIR, AFM, Raman analysis, the mGO-NH2 was successfully synthesized. The amount of 164.29 mg/g of Pb (II) removal at operation conditions (X1=120min, X2=35mg/L and X3=20 mg/L) indicated an excellent agreement with the model amount predicted. Regarding the thermodynamic studies, the adsorption procedure was spontaneous and endothermic and followed Freundlich isotherm and Redlich-Peterson (R-P) equations. In conclusion, it is affirmed the m-GO-NH2 as synthesized from T. latifolia, has a high capability for use in adsorption of Pb (II) from aqueous solution.