Preparation method of aminated MOFs material for adsorbing arsenic

The invention relates to a preparation method of an aminated MOFs material for adsorbing arsenic. The preparation method is characterized in that ceric ammonium nitrate is used as the initiator, a nitric acid solution is used as the solvent, acrylonitrile is used as the monomer, graft copolymerization triggered free radicals is performed on the surface of MIL-101, and tetraethylenepentamine is grafted to the MIL-101 to obtain aminated MIL-101. The grafting specifically includes the steps of a, performing vacuum drying on the MIL-101 at 50 DEG C until constant weight is achieved, dispersing in50mL of nitric acid solution with the concentration being 1M, stirring with magneton, and feeding nitrogen to remove oxygen; b, adding the initiator ceric ammonium nitrate and the monomer acrylonitrile, feeding nitrogen, and heating at constant temperature; c, performing suction filtration to obtain a crude product; d, using N,N-dimethyl formamide as the solvent to remove homopolymer generated inthe reaction process to ob