▎ 摘　　要

The titanate/graphene oxide composites were synthesized by thermal treatment using graphene oxides and TiO2 powder (P25), and were characterized using FTIR, SEM and XRD. The as-prepared titanate/graphene oxide composites were used as adsorbents to eliminate radiocobalt (Co-60) from aqueous solutions as a function of contact time, ionic strength and pH values. The sorption of Co-60 to titanate/graphene oxide composites was strongly dependent on pH and ionic strength at pH <8, and was independent of ionic strength at pH >8. The sorption of Co-60 was mainly dominated by inner-sphere surface complexation at high pH and by ion exchange and/or outer-sphere surface complexation at low pH values. The sorption of Co-60 on titanate and on graphene oxides was also compared, and the results indicated that the titanate/graphene oxide composites were suitable materials for the preconcentration and solidification of Co-60 and/or other radionuclides/heavy metal ions from large volumes of aqueous solutions in environmental pollution cleanup in real applications. (C) 2015 Elsevier B.V. All rights reserved.