Adsorption Behavior of Sr(II) and some Typical Co‐existent Metals Contained in High Level Liquid Waste onto a Modified Macroporous Silica‐Based Polymeric DtBuCH18C6 Composite

Abstract

To significantly reduce the bleeding of 4,49,(59)-di(tert-butylcyclohexano)-18-crown-6 (DtBuCH18C6), an improved novel macroporous silica-based polymeric composite (DtBuCH18C6+TBP)/SiO 2 -P was synthesized. It was performed by impregnating and immobilizing DtBuCH18C6 into the pores of the SiO 2 -P particles via the molecular modification of DtBuCH18C6 with a trin-butyl phosphate (TBP) through hydrogen bonding. The adsorption of a few typical simulated fission and non-fission products Pd(II), La(III), Na(I), K(I), Sr(II), Ba(II), Ru(III), Cs(I), Mo(VI), and Y(III) onto (DtBuCH18C6+TBP)/ SiO 2 -P was investigated at 323 K. It was done by examining the effect of contact time and the HNO 3 concentration in a range of 0.1-5.0 M. Sr(II), one of the main heat emitting nuclides, showed optimum adsorption onto (DtBuCH18C6+TBP)/SiO 2 -P in 2.0 HNO 3 , while others showed very weak or almost no adsorption except a portion of Ba(II). The leaching of TBP and DtBuCH18C6 from (DtBuCH18C6+TBP)/SiO 2 -P was evaluated. The average content of DtBuCH18C6, 298.7 ppm, leached from (DtBuCH18C6+TBP)/ SiO 2 -P in 2.0 M HNO 3 at 323 K was obviously lower than that of 797.3 ppm leached from DtBuCH18C6/SiO 2 -P at 298 K. The significant reduction of DtBuCH18C6 leaching from its macroporous silica-based polymeric adsorbent was achieved. It is useful for the recycle operation of the silica-based 624 DtBuCH18C6 impregnated polymeric composite in chromatographic partitioning of Sr(II) from high level liquid waste (HLLW).

Equilibrium and kinetic studies of selective adsorption and separation for strontium using DtBuCH18C6 loaded resin

“…The adsorption behavior of Sr(II) was similar to that of literature reported [20][21][22][23]. But, it should be noted that the type of molecule modifier also effect the adsorption of Sr(II).…”

“…In the previous work, the DtBuCH18C6 impregnated on SiO 2 -P for adsorption of Sr(II) has been investigated [20][21][22][23], but few data were reported about adsorption kinetics, equilibrium and adsorption behavior of continuous column. In this study, we have attempted to load the DtBuCH18C6 and a molecule modifier, 1-dodecanol, into SiO 2 -P by using its high immobilizing ability for the selective separation of Sr(II) from HLLW.…”

Novel polysiloxane resin functionalized with dicyclohexano-18-crown-6 (DCH18C6): Synthesis, characterization and extraction of Sr(II) in high acidity HNO3 medium

“…These extraction resins suffered from the leak of the ligands during the adsorption and elution processes, as well as the obvious decrease of separation efficiency in environment with higher acidity [21]. To overcome the disadvantage, here, we reported for the first time a novel kind of polysiloxane resin with the DCH18C6 ligand covalently-attached on the silica matrix.…”

A novel approach for preferential recovery of Sr from (Sr, Th)O2

“…To overcome the drawbacks of large secondary waste, volatile organic compounds (VOCs) and exorbitant cost involved in liquid-liquid extraction employing exotic extractants, supported liquid membranes and solid liquid extraction have gained prominence for the separation of metal ions in millimolar range [21][22][23]. In the present work, chromatographic resin, impregnated with DTBCH18C6 in n-octanol (available commercially) was used for the purification of leached Sr (II).…”