Manganese oxide octahedral molecular sieve (OMS-2) as an effective catalyst for degradation of organic dyes in aqueous solutions in the presence of peroxymonosulfate

- OMS-2/PMS system could efficiently catalyze the degradation of organic dyes.
- The catalyst presented a long-term stability for multiple runs.
- Sulfate radicals were suggested to be the major reactive species.
- The radicals production might involve the redox cycle of Mn(IV)/Mn(III).
- The degradation pathways of acid orange 7 in the system were proposed.