Carbonate treated coffee powder (CTCP) for selective sorption of Pu4+ over Am3+, Np4+, NpO22+, and PuO22+ from aqueous acidic solution: Investigation on mechanism, kinetics, thermodynamics, stripping and radiolytic stability. (April 2023)

• Record Type: Journal Article
• Authors: Patil, Prashant; Sarathbabu, M.; Pathak, Sachin; Sengupta, Arijit
• Is Part Of: Applied radiation and isotopes. Volume 194(2023)
• Publication Date: 2023-04
• Subjects: Biosorption -- Isotherm -- Radiation stability -- Kinetics modelling -- Spontaneous; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2023.110695
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: An attempt was made for understanding the sorption behaviour of different actinide ions Pu 4+, PuO2 2+, Am 3+, Np 4+, and NpO2 2+ on carbonate treated exhausted coffee powder (CTCP). Very efficient sorption of Pu 4+ over other actinide ions from aqueous acidic medium was observed. Almost 4 h were required for achieving equilibrium. Experimental results for Pu +4 were fitted into different sorption isotherm model: Langmuir isotherm, Freundlich isotherm, D.R, isotherm and Temkin isotherm. Based on the linear regression, it was found that, Freundlich isotherm was predominantly operative. Pseudo 2nd order kinetics was found to be effective for the sorption of Pu +4 . More than 80 % of loaded Pu 4+ was found to desorb by 0.25 M oxalic acid solution. CTCP exhibited relatively good radiation stability. Sorption of Pu +4 on CTCP was exothermic, and spontaneous in nature. The sorption process was simple, cost effective and environmentally benign, as it did not involve any sophisticated, multi-step, sorbent synthesis. Graphical abstract: Image 1 Highlights: Separation of Pu 4+ over Am 3+, PuO2 2+, NpO2 2+ and Np 4+ by carbonate treated coffee powder. Physisorption with predominance of Freundlich isotherm. Exothermic sorption and spontaneous process. Sorption followed pseudo 2nd order rate kinetics with rate constant 6.2 × 10 −4 . Simple, environmentally benign and cost effective Pu separation.