Study on the gamma-ray irradiation behavior of mesoporous silica adsorbents functionalized with phosphine oxide and phosphonic acid ligands

摘要

The resistance of mesoporous silica adsorbents bearing phosphine oxide (SBA-P(O)Pr-2) and phosphonic acid (SBA-P(O)(OH)(2)) to gamma-ray irradiation (in air and 2 mol/L HNO3 solution) was systematically evaluated. The change in the composition, structure and (U(VI)) adsorption ability of the adsorbents was examined. Both the organophosphorus ligands functionalized adsorbents exhibited remarkable durability under gamma-ray irradiation up to a total dose of 5 x 10(5) Gy. The mesoporous silica framework and the two classes of organophosphorus ligands were well-reserved without irradiation damage. Moreover, after irradiation, the adsorbents still maintained an effective adsorption of U(VI) in high acidic or pH range solutions.