In this study, a series of graphene oxide/magnesium oxide nanocomposites (GO/MgO NCs) were synthesized and applied for the removal of Methylene Blue (MB) from aqueous solutions. The prepared NCs were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results showed that MgO particles were successfully layered on GO. The impacts of different experimental variables on the removal of MB including GO/MgO NCs dosage, pH, contact time, and initial MB concentration were investigated.
Thereafter, we investigate the mechanism and kinetics of ozonation processes in the presence of GO/MgO NCs as a catalyst for the degradation of phenol. The generation of reactive oxygen species such as hydroxyl radicals (โขOH) and singlet oxygen (1O2) was studied during catalytic ozonation using tert-butyl alcohol and sodium azide as radical scavengers. The mechanism of phenol degradation under catalytic ozonation and reaction pathways were studied.
Finally, we study response surface methodology (RSM) coupled with a central composite design (CCD) to investigate process parameters affecting the removal of phenol in ozonation processes using GO/MgO NCs as a catalyst. Analysis of variance (ANOVA) was performed to determine the significant differences between the independent variables
