A hollow fiber prepared through combining polymethacrylate with manganese oxide as reusable oxidant with valence-selfstabilizing function for cation blue decolorization

Abstract

By hydrolyzing polymethacrylate hollow fiber in sulfuric acid and then treating it in the aqueous solution of potassium permanganate, we obtained a hollow fibrous oxidant in which in-situ generated manganese oxide was immobilized by partly-hydrolyzed polymethacrylate. The prepared oxidant could oxidize cation blue into colorless substance; thus, it was very efficient at decolorizing cation blue. The results of TOC, FTIR and NMR revealed that the decolorization of cation blue was mainly caused by the cleavage of its double bond of C and N. The oxidant could interact with water to produce oxygen species such as O2·- during decolorization. The oxygen species could help the oxidant to keep its Mn valence unchanged; thus, the oxidant was stable and reusable in decolorizing cation blue. The oxidant could be used up to 5 cycles without any loss in its oxidation activity. It only took less than 30 min to remove 95% of cation blue from 10 mL of its solution with the concentration of 20 mg/L for each cycle.