Amine-functionalized graphene oxide/zinc hexacyanoferrate composites for cesium removal from aqueous solutions

摘要

Amine-functionalized graphene oxide/zinc hexacyanoferrate (amino-rGO/ZnHCF) composites were successfully synthesized for the removal of Cs+ from radioactive liquid waste. Their morphologies, surface areas, pore sizes, functional groups, and thermal stabilities were investigated by field-emission transmission electron microscopy, Brunauer-Emmett-Teller analysis, Fourier transform infrared spectroscopy, and thermogravimetry. Adsorption experiments revealed high adsorption capacities at pH 5-7 and stability below pH 9. The dependence of the synthesized composites on the pseudo-second-order model and the Temkin model was also observed. The results of this study indicate that the new amino-rGO/ZnHCF composites are good adsorbent candidates for Cs removal from aqueous solutions.