Equilibrium Treatment for Highly Selective Sulfonated Microcapsules Containing Di(2-ethylhexyl)phosphoric Acid

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• 作者：ángela Alcázar ; Cristina Gutiérrez ; Antonio de Lucas ; Manuel Carmona ; Juan F. Rodríguez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：55
• 期：4
• 页码：1033-1042
• 全文大小：488K
• ISSN：1520-5045

文摘

Microcapsules containing di(2-ethylhexyl)phosphoric acid (DEHPA) within a sulfonated poly(styrene-co-divinylbenzene) shell (SMC-DEHPA), were characterized by different analytical techniques including the stepwise isothermal analysis and FT-IR, which indicated the presence of DEHPA, sulfonic groups, and sulfone cross-linking in the material. The separation of copper from aqueous solutions was investigated by equilibrium studies. According to the ideal mass action law model, the useful capacity of this material was 1.782 ± 0.013 equiv kg^–1, where DEHPA represents half of this value (in agreement with its content). On the other hand, nonsulfonated microcapsules or those without DEHPA presented lower useful capacities. Furthermore, sulfonated material exhibited an enhancement of the selectivity for copper, as confirmed by the equilibrium constants (K_sulfonated > 10⁴K_{nonsulfonated}). Thus, the incorporation of sulfonic groups into the polymeric shell favors the mobility of the counterions in the microcapsule, making available the active centers of the extractant.