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Synthesis of a novel macroporous silica-calix[4] arene-crown polymeric composite and Its adsorption for alkali metals and alkaline-earth metals / Anyun Zhang in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2047–2054 Titre : Synthesis of a novel macroporous silica-calix[4] arene-crown polymeric composite and Its adsorption for alkali metals and alkaline-earth metals Type de document : texte imprimé Auteurs : Anyun Zhang, Auteur ; Qihui Hu, Auteur ; Zhifang Chai, Auteur Année de publication : 2010 Article en page(s) : pp. 2047–2054 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Macroporous;  Calix[4];  Polymeic;  Adsorption Résumé : A macroporous silica-based 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) supramolecular recognition polymeric composite, (Calix[4] + MODB)/SiO2−P, was synthesized. The synthesis was performed by impregnation and immobilization of Calix[4]arene-R14 and methyloctyl-2-dimethylbutanemide (MODB) molecules in the pores of a macroporous SiO2−P polymeric particle support with a mean diameter of 50 μm. MODB was used to modify the Calix[4]arene-R14 through intermolecular interaction force. The static-state adsorption of some typical alkali metals and alkaline-earth metals such as Na(I), K(I), Cs(I), Rb(I), Sr(II), and Ba(II) onto (Calix[4] + MODB)/SiO2−P was investigated. The effects of contact time, HNO3 concentration in the range of 0.3−7.0 M, and temperature on the adsorption were examined. (Calix[4] + MODB)/SiO2−P exhibited strong adsorption ability and excellent selectivity for Cs(I) over all tested elements, which showed weak or almost no adsorption except for Rb(I). The adsorption onto (Calix[4] + MODB)/SiO2−P of the tested metals in HNO3 medium was exothermic. The thermodynamic parameters for the adsorptions of Cs(I) and Rb(I) were determined. It was found that, in 3.0 M HNO3, application of the (Calix[4] + MODB)/SiO2−P polymeric composite in the partitioning of Cs(I), one of the heat generators, from highly active liquid waste in the SPEC (strontium/cesium partitioning from HLW by extraction chromatography) process is promising. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901622y [article] Synthesis of a novel macroporous silica-calix[4] arene-crown polymeric composite and Its adsorption for alkali metals and alkaline-earth metals [texte imprimé] / Anyun Zhang, Auteur ; Qihui Hu, Auteur ; Zhifang Chai, Auteur . - 2010 . - pp. 2047–2054. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2047–2054 Mots-clés : Macroporous;  Calix[4];  Polymeic;  Adsorption Résumé : A macroporous silica-based 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) supramolecular recognition polymeric composite, (Calix[4] + MODB)/SiO2−P, was synthesized. The synthesis was performed by impregnation and immobilization of Calix[4]arene-R14 and methyloctyl-2-dimethylbutanemide (MODB) molecules in the pores of a macroporous SiO2−P polymeric particle support with a mean diameter of 50 μm. MODB was used to modify the Calix[4]arene-R14 through intermolecular interaction force. The static-state adsorption of some typical alkali metals and alkaline-earth metals such as Na(I), K(I), Cs(I), Rb(I), Sr(II), and Ba(II) onto (Calix[4] + MODB)/SiO2−P was investigated. The effects of contact time, HNO3 concentration in the range of 0.3−7.0 M, and temperature on the adsorption were examined. (Calix[4] + MODB)/SiO2−P exhibited strong adsorption ability and excellent selectivity for Cs(I) over all tested elements, which showed weak or almost no adsorption except for Rb(I). The adsorption onto (Calix[4] + MODB)/SiO2−P of the tested metals in HNO3 medium was exothermic. The thermodynamic parameters for the adsorptions of Cs(I) and Rb(I) were determined. It was found that, in 3.0 M HNO3, application of the (Calix[4] + MODB)/SiO2−P polymeric composite in the partitioning of Cs(I), one of the heat generators, from highly active liquid waste in the SPEC (strontium/cesium partitioning from HLW by extraction chromatography) process is promising. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901622y