Cationic organic polymer constructed by guanidyl for separating technetium and rhenium and preparation method of cationic organic polymer

The invention relates to a cationic organic polymer constructed by guanidyl for separating technetium and rhenium and a preparation method of the cationic organic polymer, and belongs to the technical field of technetium and rhenium-containing wastewater treatment. Triaminoguanidine hydrochloride and 2, 6-pyridinedicarboxaldehyde are used as matrixes, and the covalent organic polymer containing guanidyl is generated through an aldehyde-ammonia condensation reaction. The polymer material formed by strong covalent bonds has the outstanding advantages of high chemical stability, heat stability, certain radiation resistance and the like in a severe environment. N (+) cations contained in the polymer have good selectivity and capture performance on pertechnetate radicals and perrhenate radicals in the technetium and rhenium-containing waste liquid. According to the method, the pertechnetium acid radical and the perrhenium acid radical in the technetium-containing mixture or the rhenium-containing mixture can be el