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

Abstract

(2012) Equilibrium and kinetic studies of selective adsorption and separation for strontium using DtBuCH18C6 loaded resin, Journal of Nuclear Science and Technology, 49:3, 320-327, DOI: 10.1080/00223131.2012 A crown ether loaded resin was prepared by successive impregnation and fixing the 4 0 ,4 0 (5 00 )-di(tertbutylcyclohexano)-18-crown-6 (DtBuCH18C6) and its molecule modifier, 1-dodecanol, onto the porous silica/polymer composite support (SiO 2 -P particles). The characterization of DtBuCH18C6 loaded resin was examined by thermal gravimetry and differential thermal analysis and electron probe microanalysis. The adsorption behavior of Sr(II), Cs(I), Ru(III), Pd(II), La(III), Nd(III), Sm(III), Gd(III), Zr(IV), and Mo(VI) was investigated by the batch method. Furthermore, the column test for Sr (II) was performed. The batch experiments were carried out by varying the shaking times, HNO 3 concentration, and initial concentration of metal ions. A relatively large K d value above 182 cm 3 /g for Sr(II) was obtained in the presence of 3 M HNO 3 . In contrast, the K d values of Cs(I), Ru(III), Pd(II), La(III), Nd(III), Sm(III), Gd(III), Zr(IV), and Mo(VI) were considerably lower than 10 cm 3 /g. The adsorption of Sr(II) was found to be controlled by chemisorption mechanism, and followed a Langmuir-type adsorption equation. The breakthrough curve of Sr(II) had S-shaped profile, and the elution percentage was estimated to be 99.9% by using the eluent of H 2 O.

Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

“…(2000) and the results of morphological characterization of macroporous SiO 2 -P had been reported by Wei et al. (2000) and Wu et al. (2012).…”

Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies

“…The + DtBuCH 18 C 6 )/SiO 2 -P in HNO 3 was similar to that of Calix [4] or DtBuCH 18 C 6 -loaded SiO 2 -P [18][19][20]. The Adsorbent…”

“…Therefore, recovering metal ions from aqueous solution by immobilizing organic extractants into SiO 2 -P is a promising technique for separating Cs(I) and Sr(II). We previously developed types of novel silica-based Calix [4]arene and crown ether supramolecular recognition adsorbents to selectively separate Cs(I) and Sr(II) from HLLW [16,18,19]. In this study, we attempted to load Calix [4]arene-R14 and DtBuCH 18 C 6 into SiO 2 -P ((Calix [4] + DtBuCH 18 C 6 )/SiO 2 -P) for simultaneous selective separation of Cs(I) and Sr(II) from HLLW.…”

Preparation of silica-based titanate adsorbents and application for strontium removal from radioactive contaminated wastewater

“…Macrocyclic organic compounds can effectively remove strontium through molecular recognition [5,7]. However, these types of organic compounds such as crown ethers have excellent selectivity and adsorbed capacity for strontium only under an acid solution conditions [2, 5] and they must be synthesized in multiple organic processes resulting in the generation of large amounts of organic waste.…”