Effect of Irradiation on Adsorption Property of ⁹⁰Sr by Porous Silica-based Crown Ether Adsorbent

The radiation stability of adsorbent is an important reference for its practical application in high level liquid waste. A silica-based crown ether adsorbent was synthesized by impregnation the 4′,4′(5″)-Di(tert-butylcyclohexano)-18-crown-6(DtBuCH18C6) into the porous silica support. The effect of ⁶⁰Co-γ irradiation on the adsorption and reuse performance of Sr(Ⅱ) has been investigated. The characterization of adsorbent was examined using SEM, FT-IR, and MIP. The adsorbent possessed spherical and porous particles with a diameter of approximately 100 μm, a distribution frequency peak of pore size around 28.12 nm, and high porosity of 56.7%. At absorbed dose above 100 kGy, the absorption peak of carbonyl groups was observed in FT-IR spectrum while the C—O—C stretching vibration of crown ether without discernible changes. The adsorption process conformed well with Langmuir model and the adsorption capacity was decreased with increasing absorbed dose. The adsorption capacity decreased slightly (<15%) under 100 kGy absorbed dose and remained at 0.16 mmol/g at a dose of 500 kGy. A relatively high adsorption efficiency of 88.9% was obtained after 5 times adsorption/elution cycles, indicating the excellent reusability of crown ether adsorbent.