Catalytic degradation of malachite green in aqueous solution by porous manganese oxide octahedral molecular sieve (OMS-2) nanorods
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Preparation of porous manganese oxide octahedral molecular sieves (OMS-2) in presence of different inorganic acids including HF, HNO3, H3PO4, and glacial acetic acid as an organic alternative was investigated. The obtained OMS-2 samples were characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). The OMS-2 sample obtained in presence of HNO3 acted as catalyst in degradation of malachite green (MG) at near-ambient temperature in aqueous solution in presence of NaIO4 as effective oxidant. Under mild reaction conditions, mineralization was completed within 10 min and the recovered catalyst retained activity during at least five successive runs.
KeywordsMalachite green Porous manganese oxide OMS-2 Catalysis Degradation
Financial support of this study through grant no. 134303\KM from the Caspian Sea Basin Research Center of the University of Guilan is gratefully acknowledged.
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