▎ 摘　　要

Graphene oxide (GO), as a linker, was introduced into covalent organic frameworks (GO@COF (TpPa-1)) via solvothermal method, which was exploited as an adsorbent material to eliminate U(VI)/Eu(III) ions from solution. The acquired GO@ TpPa-1 was characterized by FT-IR, XRD, SEM, TEM, pH(pzc), TGA, Raman, EA, XPS and N-2 adsorption-desorption. The coupling of GO nanosheets and TpPa-1 frameworks had a cooperative effect on the construction of system with high surface area (500.8 m(2)/g), rich functional groups and distinguished stability. The pseudo-second-order kinetic model and the Langmuir adsorption isotherm were provided better described. GO@TpPa-1 exhibited ultra-high adsorption capacity for U(VI) 1532.35 mg/g and Eu(111) 886.44 mg/g, at pH 6.5 and 298 K. The extraordinary adsorption performance of GO@TpPa-1 was offered by the skeleton structure -C=N center dot center dot center dot H center dot center dot center dot O=, where U(VI)/Eu( III) ion was captured by forming a hexagonal potential trap, and the alleviated self-stacking layers by the introduction of GO nanosheets. The results illustrated the application prospect of GO@TpPa-1 for the radionuclide water treatment. (C) 2020 Elsevier B.V. All rights reserved.