Studies on uranium(VI) pertraction across a N,N,N′N′-tetraoctyldiglycolamide (TODGA) supported liquid membrane

Facilitated transport of uranium(VI) across supported liquid membranes containing T2EHDGA as the carrier extractant

“…1), suggesting that the extracted species is UO 2 (NO 3 ) 2 ·T2EHDGA (o) . Similar species was reported by us for the extraction studies involving TODGA [21]. However, Sharma et al [10], reported a species of the type UO 2 (NO 3 ) 2 ·2T2EHDGA (o) which is in sharp contrast to the species reported by us.…”

“…These results indicated that the diffusion of the metal-carrier complex is more important in deciding transport rates as compared to the D U values. This also suggests that the transport is a diffusion controlled process similar to other SLM systems studied earlier [19][20][21].…”

“…Polytetrafluoroethylene (PTFE) membranes used in the present study were procured from Sartorius, Germany. 233 U tracer was purified from the associated radiotracer impurities by ion-exchange methods reported earlier [21]. Stock solutions of the radiotracers were made in dilute nitric acid after checking the purity by alpha spectrometry.…”

“…Though U transport rate is lower as compared to Am(III) with TODGA, it was of interest to study the transport behaviour for understanding the possible interference during the recovery of minor actinides from HLW with TODGA as the carrier extractant. In view of the interesting observations made during the transport studies involving U(VI) with TODGA as the carrier extractant [21], it was thought of interest to investigate the transport behaviour of U(VI) with T2EHDGA as the carrier extractant.…”

Elaboration and characterisation of a plasticized cellulose triacetate membrane containing trioctylphosphine oxyde (TOPO): Application to the transport of uranium and molybdenum ions

“…In order to reduce the amounts of reactants and energy needed for separation and to decrease the environmental and economic impact of solvent extraction separations, several membrane-based separation techniques have been proposed in the past 30 years. Among these, supported liquid membranes (SLM) have been extensively studied since they offer high transport rates and good selectivity [1][2][3][4][5][6][7][8][9][10][11], and therefore are a very interesting option to overcome the solvent extraction downside (see [12] for a recent review on SLMbased separations). However, despite these advantages, it is commonly known that SLM are not widely used on an industrial scale nowadays, mainly due to their poor stability and subsequently short lifetime.…”