Synthesis of polymer-based hybrid materials via Mn(II) oxidation with N-bromosulphonamide polymer and their characterization

Abstract

This paper reports on synthesis and characteristics of a new hybrid material containing manganese oxides and hydrated manganese oxides (R/MO/HMO) dispersed in the structure of crosslinked copolymer. Styrene/divinylbenzene copolymer with macroporous structure, containing N-bromosulphonamide groups (1.64 mmol g−1), was used as macromolecular reagent. The new product has been obtained in the reaction of the copolymer with aqueous MnSO4 solution. Syntheses have been done by the batchwise and the column method using MnSO4 solutions in distilled water or natural mineral water (acting as a pH buffer). It has been shown that maintaining the pH of the reactant solution at adequately high level has a significant influence on the reaction as the pH decrease occurs parallel with reaction progress. The synthesized hybrid material contained ca. 7 % of manganese. The obtained material was characterized by: SEM–EDS, FT-IR, EPR and UV–Vis reflectance spectra, porous characteristics and magnetic measurements. It has been shown that the manganese deposit contains hydrated manganese(IV) oxides as the main component and minor amount of adsorbed Mn2+ ions. The prepared hybrid material has been found to be amorphous and paramagnetic. The synthesized substance emerges as a new highly reactive material applicable in the sorption and oxidation processes.