Cesium Removal from High Level Liquid Waste Utilizing a Macroporous Silica-based Calix4arene-R14 Adsorbent Modified with Surfactants

摘要

1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix[4]arene(Calix[4]arene-R14) modified with dodecanol and dodecyl benzenesulfonic acid (DBS) was impregnated into the pores of macroporous silica-based polymer support (SiO_2-P). The adsorbent was used to uptake Cs(I), Na(I), K(I), Sr(II), Pd(II), Ru(III), Y(III), La(III), Eu(III), Ce(III), Rh(III), Zr(IV), and Mo(VI) from HNO_3 solution by batch technique. The leakage of total organic carbon (TOC) and dodecyl benzenesulfonic acid from the adsorbent into aqueous phase were below 60 ppm and 0.51 wt% at 298 K, 75 ppm and 1 wt% at 318 K in the range of 0.5 ～ 5 M HNO_3, respectively. The adsorbent containing DBS presented a higher selectivity for Cs(I) compared to the DBS-free one. The K_d value of Cs(I) was about 3×10~3 cm~3/g at 0.5 M HNO_3. The adsorbent had almost no uptake for other tested metals in the range of 0.5 ～ 7 M HNO_3.