Cesium(Cs)and rubidium(Rb)separation from brine is an important and application-oriented topic.4-tert-butyl-2-(a-methylbenzyl)phenol(t-BAMBP)has been used for Cs and Rb extraction.However,the traditional extraction te...Cesium(Cs)and rubidium(Rb)separation from brine is an important and application-oriented topic.4-tert-butyl-2-(a-methylbenzyl)phenol(t-BAMBP)has been used for Cs and Rb extraction.However,the traditional extraction technology is base and acid consumed.In the present work,an innovative process for Cs and Rb extraction with t-BAMBP is developed,which consists of saponification,extraction,scrubbing and stripping.Both infrared spectrum and electrostatic potential analysis indicate the hydrogen of phenolic hydroxyl is dissociated from t-BAMBP during saponification and the oxygen of phenolic hydroxyl is the binding site for alkali metal ions.Saponified organic phase shows an excellent extraction effect for Cs^(+)and Rb^(+).The extraction reaches equilibrium in 5 min,with 99.5%Cs^(+)and 46.7%Rb^(+)are loaded into the organic phase in the single-stage extraction.Slope method indicates the structure of the extraction complex is MOR·3ROH(M=Cs^(+),Rb^(+),K^(+)),where the electrostatic attraction between M^(+)and the oxygen of phenolic hydroxyl is dominant,and the cation–p interaction has a significant effect also.The extraction complex of MOR·3ROH dissociates in the acid environment while scrubbing and stripping is completed.The Cs^(+)and Rb^(+)are separated from the mixture phase,the proton H bonds to the phenolic hydroxyl group,and the extractant is regenerated.展开更多
基金The research is financially supported by the Science and Technology Department of Qinghai Province(2019-ZJ-7001)West Light Foundation of the Chinese Academy of Sciences(Y910041014)+1 种基金Youth Innovation Promotion Association,CAS(2017467)the Tibet A-Li La-Guo Resources Co.Ltd.,China.
文摘Cesium(Cs)and rubidium(Rb)separation from brine is an important and application-oriented topic.4-tert-butyl-2-(a-methylbenzyl)phenol(t-BAMBP)has been used for Cs and Rb extraction.However,the traditional extraction technology is base and acid consumed.In the present work,an innovative process for Cs and Rb extraction with t-BAMBP is developed,which consists of saponification,extraction,scrubbing and stripping.Both infrared spectrum and electrostatic potential analysis indicate the hydrogen of phenolic hydroxyl is dissociated from t-BAMBP during saponification and the oxygen of phenolic hydroxyl is the binding site for alkali metal ions.Saponified organic phase shows an excellent extraction effect for Cs^(+)and Rb^(+).The extraction reaches equilibrium in 5 min,with 99.5%Cs^(+)and 46.7%Rb^(+)are loaded into the organic phase in the single-stage extraction.Slope method indicates the structure of the extraction complex is MOR·3ROH(M=Cs^(+),Rb^(+),K^(+)),where the electrostatic attraction between M^(+)and the oxygen of phenolic hydroxyl is dominant,and the cation–p interaction has a significant effect also.The extraction complex of MOR·3ROH dissociates in the acid environment while scrubbing and stripping is completed.The Cs^(+)and Rb^(+)are separated from the mixture phase,the proton H bonds to the phenolic hydroxyl group,and the extractant is regenerated.
