Adsorption Characteristics of Fe₂O₃@GO Polymer to As³⁺ in Water

Using graphene oxide and ferric nitrate as raw materials, Fe₂O₃@GO polymer was synthesized by impregnation method and applied to the adsorption of As³⁺ in water samples. Mass ratio of Fe/GO, pH and temperature to the adsorption effect were studied. Meanwhile, the two materials were characterized by Raman spectroscopy, FTIR, SEM. All three characterization methods show that iron has been successfully loaded onto graphene oxide. The results show that the removal rate of As³⁺ was positively correlated with the mass ratio of Fe/GO in the complex, and the alkaline and high temperature conditions were more conducive to the adsorption. Besides, the adsorption isotherms of As³⁺ on the two materials conformed to the Freundlich isotherm model, and the adsorption process was better described by pseudo-second-order model. Fe₂O₃@GO polymer compared with GO had greater adsorption capacity under the same conditions. When the initial concentration of As³⁺ was 10 mg·L^-1, the equilibrium adsorption capacity of GO and Fe₂O₃@GO could reach to 17.95 and 31.304 mg·g^-1, respectively.