▎ 摘　　要

NOVELTY - Preparing MXene/GO/NbFeB hydrogel, involves (a) forming MXene aqueous solution in the aqueous solution, (b) adding graphene oxide (GO) into an MXene aqueous solution to obtain a first mixed solution, (c) adding NbFeB (niobium iron boron) into the first mixed solution to obtain a second mixed solution, (d) adding ethylene diamine tetraacetic acid (EDTA) into the second mixed solution to obtain a third mixed solution, (e) ultrasonically mixing prepared mixture for multiple hours, and (f) placing prepared mixture in a water bath for multiple hours. USE - Method for preparing MXene/GO/NbFeB hydrogel used as adsorption-reducing agent (claimed). ADVANTAGE - The MXene/GO/NbFeB hydrogel has strong acid conditions (pH=2) and has super strong adsorption and reduction performance, which quickly form loose gold shells on the surface of the gel, and easily peeled off. The method exploits the instability of the two-dimensional material MXene to selectively reduce gold, and graphene oxide (GO)-assisted enrichment of gold (Au). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an MXene/GO/NbFeB hydrogel, which is obtained by the process.