Facile temperature-controlled preparation of nanowire OMS-2 and its high performance in peroxymonosulfate-activated catalytic degradation of organic pollutants

Currently, nanowires present a type of unique one-dimensional materials showing promising prospects in many fields. The octahedron molecular sieve (OMS-2, with chemical compositions of K2-xMn8O16) materials are utilized extensively as efficient catalysts for numerous critical reactions. In this work, it was found that the evolution from gamma-MnOOH microrod to OMS-2 nanowire can be induced facilely by altering the temperature of hydrothermal treatment. The obtained OMS-2 nanowire exhibited high catalytic activity and high durability in peroxymonosulfate (PMS) activated degradation of rhodamine B (RhB) or methylene blue (MB). Under optimum conditions (OMS-2 catalyst: 0.1 g.L-1; RhB or MB: 8 mg.L-1, 100 mL), the degradation can be completed within 10 min. The possible reason for OMS-2 nanowire's high performance was also proposed.