The invention discloses a preparation method of a porous
covalent organic framework and application of the porous
covalent organic framework in
uranyl ion capture, belonging to the technical field of adsorption materials. The preparation method comprises the following step: carrying out an
aldol condensation reaction on 2,5-dihydroxy-1,4-
phthalaldehyde (DHBD) and 2,4,6-trimethyl-1,3,5-
triazine (TMT) to prepare an
olefinic bond porous
covalent organic framework (DHBD-TMT). The DHBD-TMT prepared by the method disclosed by the invention has a large number of hydroxyl functional groups and a highly planar pi-conjugated structure, and can simultaneously realize multiple functions of
selective adsorption,
chemical reduction, photocatalytic reduction of
uranium and the like, so the adsorption capacity of
uranium is remarkably improved.
Inductively coupled plasma mass spectrometry results show that DHBD-TMT has excellent adsorption performance on
uranyl ions, and has the advantages of high adsorption capacity, good selectivity, excellent optical activity, high stability, good hydrophilicity and the like. Besides, the DHBD-TMT can reduce soluble
uranium (VI) into insoluble uranium (IV) through
chemical reduction and photocatalytic reduction under
visible light irradiation, so uranium fixation is realized; and the DHBD-TMT is an efficient adsorbent for extracting
uranyl ions.