Removal of radiocobalt from aqueous solutions using titanategraphene oxide composites》.pdf

Journal of Molecular Liquids 209 (2015) 397 –403 Contents lists available at ScienceDirect Journal of Molecular Liquids journal homepage: www. elsevier. com/ locate/molliq Removal of radiocobalt from aqueous solutions using titanate/graphene oxide composites Lei Chen a,⁎, Songsheng Lu b, Shuo Wu b, Jie Zhou b, Xiaomin Wang b a School of Chemical Engineering, Shandong University of Technology, 255049 Zibo, Shandong, PR China b New Star Institute of Applied Technology, No. 451 Huangshan Road, Hefei, Anhui 230031, PR China a r t i c l e i n f o a b s t r a c t Article history: The titanate/graphene oxide composites were synthesized by thermal treatment using graphene oxides and TiO2 Received 8 April 2015 powder (P25), and were characterized using FTIR, SEM and XRD. The as-prepared titanate/graphene oxide com- Received in revised form 27 May 2015 posites were used as adsorbents to eliminate radiocobalt (60Co) from aqueous solutions as a function of contact Accepted 3 June 2015 60 time, ionic strength and pH values. The sorption of Co to titanate/graphene oxide composites was strongly Available online 11 June 2015 dependent on pH and ionic strength at pH b 8, and was independent of ionic strength at pH N 8. The sorption Keywords: of 60Co was mainly dominated by inner-sphere surface complexation at high pH and by ion exchange and/or