Modified chelating resin for heavy metal ion adsorption

The invention discloses modified chelating resin for heavy metal ion adsorption. The modified chelating resin is prepared by the following steps: 1) preparing polyglycidyl methacrylate resin; (2) carrying out aminoguanidine functional modification on the resin prepared in the step (1); and (3) carrying out adsorption enhancement modification on the resin prepared in the step (2) by adopting carbon dots as a modifier to obtain the modified chelate resin. The preparation method comprises the following steps: firstly, preparing macroporous cross-linked polyglycidyl methacrylate resin (PGMA) with good adsorption performance by taking GMA as a monomer, and then connecting 1, 3-diaminoguanidine hydrochloride to the resin so as to introduce a large amount of amino groups; on one hand, the modification of enriching the amino group is convenient for further functional modification on the PGMA, and on the other hand, the adsorption performance of the PGMA on the heavy metal ions can be remarkably improved through the c