Highly efficient and heterogeneous OMS-2 for the directly oxidative degradation of organic dyes under acidic condition

Manganese oxide octahedral molecular sieves (OMS-2) are important environmental oxidants and catalysts in sewage treatment; however, most existing work has only focused on its catalytic activity . In this work, we first report the highly efficient and heterogeneous OMS-2 for the directly oxidative degradation of organic dyes (including reactive red 2, reactive blue 19, acid orange 7, rhodamine B and methylene blue), via a non-radicals process, under acidic condition. Then the effects of OMS-2 concentration, pH condition, reaction temperature and initial concentration of organic dye have been investigated for directly oxidative degradation. In addition, OMS-2 has been successfully recycled at least five times for directly oxidative degradation without any obviously decrease in activity. These findings provide general guidance for designing active OMS-2 for cost-effective water and wastewater treatment.