Decolorization of organic dye solution by ozonation; Optimization with response surface methodology

A new hetero-Fenton type GO/Fe 2 V 4 O 13 was developed and characterized by FT-IR, XRD, HR-SEM, TEM, and UV-DRS analysis. XRD pattern reveals the presence of monoclinic phase of Fe 2 V 4 O 13 in the catalyst. TEM images show the particle sizes in the range from 20 to 100 nm and the nice dispersion of nanosized Fe 2 V 4 O 13 particles on the surface of the graphene oxide. The hetero-Fenton catalyst was used for the degradation of Methyl orange (MO) under UV and solar light. The mineralization rate was influenced by H 2 O 2 concentration, pH, and catalyst loading. The reusability 21% GO/Fe 2 V 4 O 13 was analyzed. GO/Fe 2 V 4 O 13 was stable and reusable up to five cycles with 95% degradation. Solar experiments were carried out at different initial solution pH with Fe 2 V 4 O 13 and 21% GO/Fe 2 V 4 O 13 . Both catalysts show maximum degradation efficiency at pH 6. Mechanism of heterophoto-Fenton process is also proposed. This study reveals that Fe 2 V 4 O 13 and 21% GO/Fe 2 V 4 O 13 catalysts are efficient under UV and solar light for the degradation MO and can be utilized for the treatment of dye wastewater.