Uranium Adsorption on Ferroferric Oxide/Graphene Oxide Nanoribbon Composite Material

A functional ferroferric oxide/graphene oxide nanoribbons (MGONRs) composite material was synthesized by hrdrothermal method using graphene oxide nanoribbons (GONRs) as raw material which was formed by longitudinal unzipping multi-walled carbon nanotubes (MWCNTs) with KMnO₄ and H₂SO₄. The structure, morphology and property of as-prepared MGONRs were characterized by SEM, FT-IR and XRD, and adsorption behaviors of U(Ⅵ) on as-prepared adsorbents were investigated by varying pH, adsorbent dosage, contact time, initial uranium concentration and temperature. The results show that U(Ⅵ) adsorption on MGONRs was pH-dependent, endothermic, spontaneous and a pseudo-second order process. Higher temperature is beneficial to the U(Ⅵ) adsorption. The adsorption process obeys Langmuir isotherm model, and has the maximum adsorption capacity of 123.2 mg/g and good regeneration performance. MGONRs could have practical application in separation and recovery of uranium from radio-wastewater.