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A high selectivity U(vi)-imprinted g-C3N4/β-CD sorbent was synthesized and used for selective removal of U(vi). The interaction mechanism is mainly surface complexation and electrostatic attraction.

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Enrichment of U VI is an urgent project forn uclear energy development. Herein, magnetic graphitic carbon nitride nanosheets were successfully prepared by in situ anchoringo fp yrrhotite( Fe 7 S 8 )o nt he graphitic carbon nitride nanosheet (CNNS), whichw ere used for capturing U VI .T he structural characterizations of Fe 7 S 8 /CNNS-1 indicated that the CNNS could prevent the aggregation of Fe 7 S 8 and the saturation magnetization was4 .69 emu g À1 ,w hich meant that it was easy to separatet he adsorbent from the solution. Adsorption experiments were performed to investigate the sorptionp roperties. The results disclosed that the sorption data conformed to the Langmuir isotherm model with the maximum adsorptionc apacity of 572.78 mg g À1 at 298 K. The results of X-ray photoelectron spectroscopy (XPS) demonstrated that the main adsorption mechanism are as follows:U VI is adsorbed on the surface of Fe 7 S 8 /CNNS-1 through surfacec omplexationi nitially,t hen it wasr educed to insoluble U IV .T hereby,t his work provideda ne fficient and easy to handle sorbent material for extractiono fU VI .Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi., Fuel Process. Technol. 2001, 71,99.Scheme2.Aschematic diagram of the use of Fe 7 S 8 /CNNSf or the adsorption and reduction of uranium(VI).

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