Abstract
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 (Ksulfonated > 104Knonsulfonated). Thus, the incorporation of sulfonic groups into the polymeric shell favors the mobility of the counterions in the microcapsule, m...
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