Substituted diamides of dipicolinic acid as extractants and ionophores for rare earth metals  

作　　者：Yingchao Ren Valery A.Polukeev Ekaterina V.Kenf Liudmila I.Tkachenko Mikhail Yu Alyapyshev Vasily A.Babain Andrey V.Nechaev Andrey V.Legin Dmitry O.Kirsanov 

机构地区：[1]Institute of Chemistry,Saint-Petersburg University,Peterhof,Universitetsky Prospect 26,198504,Saint-Petersburg,Russia [2]JSVC Vekton,Ul.2-oy Luch 9,192019,Saint-Petersburg,Russia [3]Khlopin Radium Institute,194021,28,2nd Murinsky av,Russia [4]ThreeArc Mining LLC,Pr.Narodnogo Opolchenia 10,198216,Saint-Petersburg,Russia [5]Rusredmet,Vosstanovleniya str.,15,bl.3198320,St.Peterburg,Krasnoe selo,Russia

出　　处：《Journal of Rare Earths》2023年第8期1234-1241,I0005,共9页稀土学报（英文版）

摘　　要：The variety of newly synthesized diamides of dipicolinic acid(DPA)bearing methyl-and oxymethyl substituents in various positions of phenyl ring was investigated as potential ligands for liquid-liquid extraction of rare earth metal ions and as membrane active compounds in plasticized polymeric membranes of potentiometric sensors.It is found that scandium is extracted with 2,6-pyridinedicarboxylic acid diamides similarly to heavy lanthanides,while yttrium is extracted together with light group lanthanides.DPA shows high selectivity for the separation of cadmium/zinc,lead/nickel or copper/nickel pairs.The four out of six studied ligands demonstrate significant potentiometric sensitivity towards scandium,yttrium and lanthanides in 10^(-7)-10^(-3)mol/L concentration range in nitric acid solutions.The trends in sensitivity values vary depending on a ligand structure and the highest values are observed for Sc^(3+)and heavy lanthanides.According to the evaluated selectivity Sm^(3+)is the most preferred ion,while La^(3+)is the most discriminated.The differences in sensor behavior in rare earth metal solutions assume that such devices can be applied in sensor arrays for potentiometric analysis of lanthanide mixtures.

关 键 词：Dipicolini cacid diamides SCANDIUM YTTRIUM LANTHANIDES Extraction Potentiometric sensors 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TF845[自动化与计算机技术—控制科学与工程]