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Silica materials doped with bifunctional ionic liquid extractant for yttrium extraction / Yinghui Liu in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7308–7313 Titre : Silica materials doped with bifunctional ionic liquid extractant for yttrium extraction Type de document : texte imprimé Auteurs : Yinghui Liu, Auteur ; Lili Zhu, Auteur ; Xiaoqi Sun, Auteur Année de publication : 2009 Article en page(s) : pp. 7308–7313 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Silica-based  organic-inorganic  hybrid  materials  Binary  mixture  Ionic  liquids Résumé : Two new silica-based organic−inorganic hybrid materials (B104SGs and O104SGs) doped with a binary mixture of imidazolium and phosphonium ionic liquids have been synthesized and used as sorbents in batch system for rare earths (RE) separation. Imidazolium ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate (C4mim+PF6−) or 1-octyl-3-methylimidazolium hexafluorophosphate (C8mim+PF6−) acted as porogens to prepare porous materials and additives to stabilize extractant within silica gel. Trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate (Cyphos IL 104), a low-molecular-mass organic gelator, can encourage the formation of porous silica materials and increase the rate of aggregation. Cyphos IL 104 not only acted as an excellent template for the preparation of silica sorbents but also as a bifunctional ionic liquid extractant (bif-ILE) for RE(III) extraction. By the electrostatic attraction between the SiO- groups and phosphonium cations along the surfaces of the silica gel, stable silica sorbents with high extractant content were formed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900468c [article] Silica materials doped with bifunctional ionic liquid extractant for yttrium extraction [texte imprimé] / Yinghui Liu, Auteur ; Lili Zhu, Auteur ; Xiaoqi Sun, Auteur . - 2009 . - pp. 7308–7313. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7308–7313 Mots-clés : Silica-based  organic-inorganic  hybrid  materials  Binary  mixture  Ionic  liquids Résumé : Two new silica-based organic−inorganic hybrid materials (B104SGs and O104SGs) doped with a binary mixture of imidazolium and phosphonium ionic liquids have been synthesized and used as sorbents in batch system for rare earths (RE) separation. Imidazolium ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate (C4mim+PF6−) or 1-octyl-3-methylimidazolium hexafluorophosphate (C8mim+PF6−) acted as porogens to prepare porous materials and additives to stabilize extractant within silica gel. Trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate (Cyphos IL 104), a low-molecular-mass organic gelator, can encourage the formation of porous silica materials and increase the rate of aggregation. Cyphos IL 104 not only acted as an excellent template for the preparation of silica sorbents but also as a bifunctional ionic liquid extractant (bif-ILE) for RE(III) extraction. By the electrostatic attraction between the SiO- groups and phosphonium cations along the surfaces of the silica gel, stable silica sorbents with high extractant content were formed. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900468c

Synthesis of N-methylimidazolium functionalized strongly basic anion exchange resins for adsorption of Cr(VI) / Lili Zhu in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3261–3267 Titre : Synthesis of N-methylimidazolium functionalized strongly basic anion exchange resins for adsorption of Cr(VI) Type de document : texte imprimé Auteurs : Lili Zhu, Auteur ; Yinghui Liu, Auteur ; Ji, Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 3261–3267 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : N-Methylimidazolium  Cr(VI)  Aqueous  solution  Adsorption Résumé : N-Methylimidazolium functionalized strongly basic anion exchange resins in the Cl− form (RCl) and SO42− form (R2SO4) were synthesized and employed for adsorption of Cr(VI) from aqueous solution. FT-IR and elementary analysis proved the structures of anion exchange resins and the content of functional groups. The gel-type strongly basic anion exchange resins had high thermal stability according to TGA and good chemical stability under the experimental conditions. The adsorption behaviors of Cr(VI) on RCl and R2SO4 were studied using the batch technique. It was shown that adsorption equilibrium was reached rapidly within 60 min. The adsorption data for RCl and R2SO4 were consistent with the Langmuir isotherm equation. The maximum adsorption capacities of RCl and R2SO4 were 132 and 125 mg/g, respectively, with almost all active sites fully occupied. RCl and R2SO4 could be used in the wide pH range 1−12 and were very suitable to remove Cr(VI) at a low concentration level. They also showed great preference to Cr(VI) compared to the other counterions. RCl was easily regenerated using the mixed solution of 0.3 mol/L NaOH and 0.3 mol/L NaCl, and retained nearly 100% of its orginal capacity during four cycles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801278f [article] Synthesis of N-methylimidazolium functionalized strongly basic anion exchange resins for adsorption of Cr(VI) [texte imprimé] / Lili Zhu, Auteur ; Yinghui Liu, Auteur ; Ji, Chen, Auteur . - 2009 . - pp. 3261–3267. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3261–3267 Mots-clés : N-Methylimidazolium  Cr(VI)  Aqueous  solution  Adsorption Résumé : N-Methylimidazolium functionalized strongly basic anion exchange resins in the Cl− form (RCl) and SO42− form (R2SO4) were synthesized and employed for adsorption of Cr(VI) from aqueous solution. FT-IR and elementary analysis proved the structures of anion exchange resins and the content of functional groups. The gel-type strongly basic anion exchange resins had high thermal stability according to TGA and good chemical stability under the experimental conditions. The adsorption behaviors of Cr(VI) on RCl and R2SO4 were studied using the batch technique. It was shown that adsorption equilibrium was reached rapidly within 60 min. The adsorption data for RCl and R2SO4 were consistent with the Langmuir isotherm equation. The maximum adsorption capacities of RCl and R2SO4 were 132 and 125 mg/g, respectively, with almost all active sites fully occupied. RCl and R2SO4 could be used in the wide pH range 1−12 and were very suitable to remove Cr(VI) at a low concentration level. They also showed great preference to Cr(VI) compared to the other counterions. RCl was easily regenerated using the mixed solution of 0.3 mol/L NaOH and 0.3 mol/L NaCl, and retained nearly 100% of its orginal capacity during four cycles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801278f