An effective and facial method for removal of lead(II), copper(II) and Nickel(II) ions from aqueous solutions, is based on investigating a new modified graphene oxide, by appealing interaction between graphene oxide GO and 4-amino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one (4-aminoantipyrine). The adsorbent is fully characterized by FT-IR, XRD, SEM, EDX, TEM, and Raman spectroscopy. The GO was prepared using a modified Hummers method by the reaction of potassium permanganate with graphite in presence of a mixture of sulfuric and phosphoric acids. This novel solid phase adsorbent 4-aminoantipyrine-GO was utilized to adsorb Pb(II), Cu(II) and Ni(II) ions from aqueous solutions because of amide functional group, is resulting an efficient adsorption. Also the abundant oxygen-containing functional groups on the surfaces of graphene oxide GO play an important role in metal ions sorption. The adsorption isotherms data were well fitted with Langmuir isotherm for Pb(II), Cu(II) and Freundlich isotherm for Ni(II) ions respectively. The kinetics of Pb(II), Cu(II) and Ni(II) ions adsorption were well fitted with pseudo second-order equation. The results of thermodynamic parameters referred to chemical adsorption. Also the positive values of standard heat of adsorption (ΔHo) and negative values of (ΔGo) indicated that the adsorption process was endothermic and spontaneous. |
