Synergistic Mechanism of Photocatalysis and Photo-Fenton by Manganese Ferrite and Graphene Nanocomposite Supported on Wood Ash with Real Sunlight Irradiation

The present research aimed to evaluate the photocatalytic activity of reduced graphene oxide and manganese ferrite nanocomposite supported on eucalyptus wood ash waste (WA) from industrial boilers, for decolorization methylene blue (MB) solutions, using sunlight as an irradiation source. For this, photocatalyst named MnFe2O4-G@WA was synthesized by a solvothermal method characterized analyzes scanning electron microscopy, transmission X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller zeta potential. Firstly, evaluated MB under different reaction conditions. Then, influence pH, dose H2O2 evaluated. showed 94% efficiency operating conditions solar irradiation, 0.25 g/L catalyst, 300 mg/L H2O2. proposed degradation mechanism suggested that photodegradation through synergistic photocatalysis photo-Fenton reactions, with combined action three materials used. data adjusted first order kinetics Langmuir–Hinshelwood model. In addition, high stability, maintaining its above 90% after 5 cycles. results indicated nanophotocatalyst is potential technology solutions.