Graphene oxide based dopamine mussel-like cross-linked polyethylene imine nanocomposite coating with enhanced hexavalent uranium adsorption. Issue 28 (2nd July 2019) - Li, Songwei
Abstract : GO-pDA-PEI with excellent stability provided enough movement space and active sites for highly preferential adsorption of U(vi ). Abstract : Polydopamine (pDA) self-polymerized from mussel-substance dopamine (DA) induced the grafting of polyethylene imine (PEI) between graphene oxide (GO) interlayers to form the GO-pDA-PEI adsorbent for capturing U(vi ). The as-prepared GO-pDA-PEI has a hexavalent uranium (U(vi )) adsorption capacity of 530.6 mg g −1, which is 177% higher than that of pristine GO. Both thermodynamic and kinetic studies indicate a spontaneous and exothermic chemisorption process. The adsorbent demonstrates high adsorption capability and stability even after 5cycles of adsorption–desorption processes. The enhanced U(vi ) adsorption capability was due to the unique characteristics of the nanoadsorbent, i.e., the ability to provide enough movement space and highly active sites for the adsorption of U(vi ).