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

Abstract

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 HNO 3 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 9 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.

Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

“…To date, a variety of sorbents have been developed for exaction of uranium from highly acidic and/or radioactive medium, such as synthetic resins, − mesoporous silica − and covalent organic framework . For example, Subramanian et al .…”

Obtention of crosslinked hybrid films from xanthan gum and 3-(trimethoxysilyl)propyl methacrylate for controlled drug delivery

“…There are some reports of the inorganic particle's synthesis, such as silica, using gamma irradiation [25,26]. Zhan et al introduced gamma ray during the process synthesis of mesoporous silica, and they successfully obtained well-kept Si particles [27].…”

Grafted mesoporous silicas for radionuclide uptake: Radiolytic stability under electron irradiation

“…To date, irradiation of mesoporous SBA-15 silica grafted with various ligands has been studied using gamma irradiation [23,[27][28]. However, the dose accumulated in these studies was quite low (from 10 kGy to 500 kGy).…”

“…However, the dose accumulated in these studies was quite low (from 10 kGy to 500 kGy). Zhang et al [28] showed that phosphine oxide and phosphinic acid ligands grafted on a SBA-15 matrix retain their sorption ability when irradiated up to 500 kGy. Iqbal et al [23,27] evidenced no or little reduction of the sorption ability of ethylenediaminetetraacetic acid, aminopropyl and N-propylsalicyl-aldimino grafted SBA-15 irradiated up to 1 kGy.…”