Preparation of a macroporous silica–pyridine multidentate material and its adsorption behavior for some typical elements

Abstract

A new macroporous silica‐based‐polymer (SiO2‐P) soft ligand composite material, 2,6‐bis(5,6‐di(iso‐butyl)‐1,2,4‐triazine‐3‐yl)pyridine (BDIBTP/SiO2‐P), was synthesized by impregnation and immobilization of BDIBTP and 1‐octanol molecules into the pores of the SiO2‐P particles. The impact of some typical alkali metal and alkaline earths Cs(I), Na(I), K(I), Rb(I), Sr(II), and Ba(II) containing in highly active liquid waste (HLW) on the adsorption of Pd(II) onto BDIBTP/SiO2‐P was studied. It was performed by examining the effects of contact time and the HNO3 concentration in the range of 0.3–7.0 M. BDIBTP/SiO2‐P showed strong adsorption ability and high selectivity for Pd(II) over all the tested metals. The chromatographic partitioning of Pd(II) from a simulated HLW solution was conducted by BDIBTP/SiO2‐P packed column. Pd(II) was effectively eluted with 0.2 M thiourea–0.1 M HNO3. The others showed no adverse impact on separation of Pd(II). The results are beneficial to partitioning of minor actinides and Pd(II) together from HLW by BDIBTP/SiO2‐P in the MPS process developed. © 2012 American Institute of Chemical Engineers AIChE J, 2012

Extraction of Cesium and Some Typical Metals with a Supramolecular Recognition Agent 1,3-Bis(1-nonyloxy)-2,4-crown-6-calix[4]arene

“…The ionic strength in aqueous phase in the determination of the complex composition of Cs(I) was maintained by addition of a stock solution of NaNO 3 . The concentrations of the metals in HNO 3 solution were around 5.0·10 –3 mol·kg –1 . ,,,− …”

“…After the phases were centrifuged and separated, the measurement of the contents of the tested metals in the aqueous phase proceeded, using a Varian 700-ES model simultaneous inductively coupled plasma-optical emission spectrometer (ICP-OES, Varian, Inc., Palo Alto, CA, USA) with the exception of the concentrations of Cs(I), Na(I), Rb(I), and K(I), which were analyzed using a Varian AA 240 FS model atomic adsorption spectroscope, similar to a method reported previously. Distribution ratios ( D M ) of the tested elements were calculated using the following equation: ,,,− D normalM = C false( normalo false) / C false( normala false) In eq , C (o) and C (a) represent the equilibrium concentrations of the tested metals in organic phase and the aqueous phase, respectively.…”

Adsorption Behavior of Sr and Ba Using TDS-Impregnated Microporous Silica-Based Adsorbents in Nitric Acid Solution

“…Various methods for the separation of Sr ions from aqueous solutions have been studied [7][8][9][10][11][12][13][14][15] . In the methods that rely on porous materials, the Sr ion has been shown to be separable from aqueous solution via adsorption of the ion onto arsenate-modified mesoporous titania 7) , sodium-modified mesoporous titanium dioxide 8) , or expanded perlite 9) .…”

“…In 3-yl)pyridine (BDIBTP) were used 14,15) . However, in these studies, Ba ions were separated from HLLW alongside Sr ions during the same process, as a consequence of the similar chemical properties of Ba and Sr ions.…”

Extraction behavior of cesium and some typical fission and non-fission products with a new 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene

“…To evaluate the complexation of Cs(I), the present work was focused on (1) the synthesis of 1,3-di(1-decyloxy)-2,4-crown-6-calix [4] were of analytical grade and were used without further treatment [26].…”