Abstract
Abstract Bis-octyloxy-calix[4]arene-mono-crown-6 (CMC) was evaluated for radio-cesium separation from acidic feed solutions using hollow fiber supported liquid membrane (HFSLM) technique. Solvent extraction and flat sheet supported liquid membrane (FSSLM) studies were pursued to optimize the conditions required for the subsequent HFSLM studies. The permeation rate of cesium in HFSLM increased steadily with nitric acid concentration from 1 M HNO 3 to 6 M HNO 3 . At a moderate acidity of 4 M HNO 3 , which is the acid concentration of the high level waste, near quantitative (>99%) transport of cesium was possible within 2 h of operation at 300 mL scale. Transport was suppressed under simulated high level waste conditions due to the presence of large concentrations of cesium (0.32 g/L), but >90% transport was observed in 6 h. Stability of the membrane was excellent as monitored from 12 days of continuous operation. The permeability coefficient, mass transfer coefficient and various diffusional parameters of the diffusing metal/ligand species were calculated to understand the permeation behvaiour of cesium. The present work explored the possible use of CMC in hollow fiber contactor for radioactive waste treatment where the ligand inventory is very low.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
