High-efficiency removal of cationic dye and heavy metal ions from aqueous solution using amino-functionalized graphene oxide, adsorption isotherms, kinetics studies, and mechanism

GO-NH2 (amino functionalized graphene oxide) was synthesized by grafting (3-aminopropyl) triethoxysilane onto the surface GO (graphene oxide). The with a higher area and many active sites characterized its effectiveness in removing Rhod B dye Ni(II) ions from wastewater adsorption observed. effects of pH, time, strange on efficiency were investigated. equilibrium isotherm data confirmed that it fits Langmuir Freundlich models. exhibited high capacity (QM); 2500 (mg L-1) 3333 for dye, 312.5 L-1), 714.28 L?1) ions, respectively. kinetics studied using pseudo-first-order, pseudo-second-order, intraparticle diffusion, Boyd model. It found followed pseudo-second-order film diffusion model are effective this process. Adsorption mechanisms have been attributed to possible electrostatic attractions, hydrogen bonding, interactions. In summary, experimental results showed would be promising adsorbents remove aqueous solutions contaminated ions.