Enhanced Sorption Of Mn2+ Ions From Aqueous Medium By Inserting Protoporphyrin As A Pendant Group In Poly(vinylpyridine) Network

Abstract

The main goal of the present work was to evaluate the effect of protoporphyrin (PP) (as pendant group) incorporated into a poly(vinylpyridine) [poly(VPY)] polymer network on the sorption of Mn2+ ions from an aqueous medium. The sorbent materials - poly(PP-co-VPY) and poly(VPY) - were characterized by SEM, FTIR, elemental analysis and nitrogen adsorption-desorption measurements (BET - Barrett-Joyner-Halenda and BJH - Brunauer-Emmett-Teller). It was observed that the pseudo-second-order kinetic model fitted the experimental data very well (R2=0.9967), confirming that the Mn2+ sorption onto poly(PP-co-VPY) took place via chemical reactions (chemisorption). To describe the equilibrium between the Mn2+ ions and sorbents and estimate the maximum sorption capacity, different models, including Langmuir, Freundlich, Dubinin-Radushkevich and dual-site non-linear Langmuir-Freundlich equations, were applied to the experimental data. The dual-site Langmuir-Freundlich model provided the best fit for poly(PP-co-VPY) and poly(VPY), yielding the maximum sorption capacity of 5.0 and 1.79mgg-1, respectively. These findings suggest the presence of homogeneous and heterogeneous binding sites able to sorb Mn2+ ions. Binary solutions of Mn2+/Zn2+, Mn2+/Pb2+ and Mn2+/Fe3+ were submitted to competitive sorption in the polymers. The results obtained for these systems demonstrated 4.75, 18.24 and 388-fold increases in the rate of the Mn2+ sorption onto poly(PP-co-VPY), when compared with poly(VPY). 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