Extraction of th (IV) from an HNO3 solution by diglycolamide in ionic liquids / Yinglin Shen in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13990-13996 Titre : Extraction of th (IV) from an HNO3 solution by diglycolamide in ionic liquids Type de document : texte imprimé Auteurs : Yinglin Shen, Auteur ; Shaofei Wang, Auteur ; Lun Zhu, Auteur Année de publication : 2012 Article en page(s) : pp. 13990-13996 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic liquid Résumé : Extraction of thorium(IV) from a nitric acid solution into various 1-alkyl-3-methylimidazolium hexafluorophosphate ([Cnmim] [PF6], n = 4,6,8) ionic liquids (ILs) was investigated using N,N,N',N'-tetrabutyl-3-oxapentanediamide (TBDA) and N, N'-dimethyl-N,N'-dibutyl-3-oxapentanediamide (MBDA) as the extractants, The extraction efficiency of Th4+ ions in the ionic liquid is higher than that obtained in chloroform under low nitric acid concentration. The extraction mechanism has been studied by slope analysis, UV―vis measurement, and extraction tests. The conventional log―log plot analysis of the extraction equilibrium data reveals that Th4+ ions are extracted as cation complexes characterized by a metal/ligand ratio of 1:2 using MBDA as an extractant. In addition Th4+ ions form 1:2 complexes with TBDA in [bmim]PF6 and [hmim]PF6 and 1:1 complexes in [omim][PF6] and chloroform. The mode of partitioning of thorium ions into [bmim]PF6 and [hmim]PF6 with TBDA appears to proceed predominantly via a cation-exchange mechanism, whereas for [omim][PF6] thorium extraction mechanism is changed from an cation-exchange process to one involving extraction of a neutral thorium-TBDA-nitrato complex as the aqueous nitrate concentration is increased. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299867 [article] Extraction of th (IV) from an HNO3 solution by diglycolamide in ionic liquids [texte imprimé] / Yinglin Shen, Auteur ; Shaofei Wang, Auteur ; Lun Zhu, Auteur . - 2012 . - pp. 13990-13996. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13990-13996 Mots-clés : Ionic liquid Résumé : Extraction of thorium(IV) from a nitric acid solution into various 1-alkyl-3-methylimidazolium hexafluorophosphate ([Cnmim] [PF6], n = 4,6,8) ionic liquids (ILs) was investigated using N,N,N',N'-tetrabutyl-3-oxapentanediamide (TBDA) and N, N'-dimethyl-N,N'-dibutyl-3-oxapentanediamide (MBDA) as the extractants, The extraction efficiency of Th4+ ions in the ionic liquid is higher than that obtained in chloroform under low nitric acid concentration. The extraction mechanism has been studied by slope analysis, UV―vis measurement, and extraction tests. The conventional log―log plot analysis of the extraction equilibrium data reveals that Th4+ ions are extracted as cation complexes characterized by a metal/ligand ratio of 1:2 using MBDA as an extractant. In addition Th4+ ions form 1:2 complexes with TBDA in [bmim]PF6 and [hmim]PF6 and 1:1 complexes in [omim][PF6] and chloroform. The mode of partitioning of thorium ions into [bmim]PF6 and [hmim]PF6 with TBDA appears to proceed predominantly via a cation-exchange mechanism, whereas for [omim][PF6] thorium extraction mechanism is changed from an cation-exchange process to one involving extraction of a neutral thorium-TBDA-nitrato complex as the aqueous nitrate concentration is increased. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299867

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