Separation of actinides using hollow fiber supported liquid membranes

Abstract

Hollow fiber supported liquid membrane (HFSLM) studies were carried out using TODGA (N,N,N ,N -tetraoctyl diglycolamide) -DHOA (di-n-hexyloctanamide) -NPH (normal paraffin hydrocarbon) and Cyanex-301-n-dodecane as carriers. The first carrier was employed to recover trivalent actinides and lanthanides from simulated high level waste (SHLW) of pressurized heavy water reactor (PHWR) origin. Subsequently, the mutual separation of the actinides and the lanthanides was demonstrated with the second carrier (Cyanex-301-n-dodecane). Quantitative transport of Am(III) and Nd(III) was observed in 45 min from a feed solution (500 mL) containing 1 g/L Nd spiked with 241 Am at 3 M HNO 3 . Similarly, all the lanthanides (La, Ce, Pr, Nd and Sm) and tracer Am(III) were quantitatively recovered in 30 min from SHLW. No significant transport of other metal ions present in SHLW was observed. Quantitative and selective recovery of Am(III) was achieved by Cyanex-301-n-dodecane from feed solution containing 1 g/L total lanthanides spiked with 241 Am tracer. The physical stability of HFSLM was reasonably good during continuous operation for over 72 h. Radiolytic stability of solvent and hollow fibre module up to 500 kGy dose was also satisfactory.

Fabrication of Conducting Nanochannels Using Accelerator for Fuel Cell Membrane and Removal of Radionuclides: Role of Nanoparticles

“…Polymeric membranes exhibit a high efficiency toward many industrial applications such as air purification, water filtration, sensor, ion transport, and energy production using a green technology. − Apart from these applications, their separation technology is a fundamental aspect from the chemical industries and academic viewpoints. , Among the separation methods, radioactive waste treatment is of prime importance, especially in nuclear power plants and health departments, including in the field of cancer cell imaging. − Recently, the separation and sensing of radioactive sources from aqueous/waste solution are of prime importance. Ion-exchange membranes (IEMs) have received much attention because of their easily portable, ambient temperature operation, lightweight, and high power density. − The membrane-driven technologies provide a clean and affordable source of energy for portable and stationary electronics.…”

Selective recovery of uranium from THOREX feed by hollow fibre supported liquid membrane technique containing di(2-ethylhexyl) isobutyramide (D2EHIBA) as the carrier

“…Radiation induced degradation of the membrane was not investigated in the present study though it is expected that the PP fibres will be stable up to 500 kGy [25]. The radiation stability of D2EHIBA was reported in an earlier publication and was found to decrease the D U values to about 60% of the value obtained with the unirradiated extractant [9].…”

Novel 90Sr–90Y generator system based on a pertraction through supported liquid membrane in hollow fiber contactor

“…SLM extraction of Sr(II) and Y(III) was performed in a HF membrane contactor designed and constructed in our laboratory, which consisted of seven hydrophobic microporous polypropylene HF membranes enclosed in a glass shell with an inner diameter of 0.7 cm. Polypropylene HFs have been shown a good radiation stability and can be safely used for the separation of radionuclides [2,26]. The fibers were potted on both ends of the shell with epoxy resin.…”