Nuclear chemistry

Catalysis

Adsorption

Engineering

Perrhenate

Chelation

Selective adsorption

Human decontamination

Rhenium

Inorganic chemistry

Waste management

Organic chemistry

Amine gas treating

Technetium

Pertechnetate

Chemistry

Selectivity

The Science of The Total Environment

The efficient decontamination of pertechnetate (99TcO4−) is an essential task for managing radioactive 99Tc in nuclear wastes. Perrhenate, (ReO4−), as a nonradioactive analog, exhibits almost identical physicochemical properties as 99TcO4−. Herein, a novel magnetic amine-functionalized MIL-101(Cr) (NH2-MIL-101(Cr)@Fe3O4) was prepared and used to efficiently remove ReO4− from solution for the facile magnetic separation. A series of environmental parameters were considered to investigate the adsorption performance of NH2-MIL-101(Cr)@Fe3O4. Experimental results suggested that NH2-MIL-101(Cr)@Fe3O4 has reached a satisfied adsorption capacity (~401 mg/g) and a very fast adsorption kinetics at pH 7.0. The selectivity for ReO4− was maintained even in the presence of interfering anions with relatively high concentrations. ReO4− were mainly captured by N-donor sites of the surface-decorated amine via complexation and were trapped in the cavities of modified MIL-101(Cr). NH2-MIL-101(Cr)@Fe3O4 exhibits satisfactory adsorption performance for ReO4− and can be conveniently separated from wastewaters after adsorption.

Efficient capture of ReO4− on magnetic amine-functionalized MIL-101(Cr): Revealing from selectivity to mechanism