Phosphomolybdic acid clusters and carbon nitride coloading on NH2-N-rGO for photocatalytic oxidation desulfurization

The uncontrolled burning of fossil fuels results in a tremendous increase in atmospheric pollution, which requires immediate mitigation. Herein, an HPMo-g-C3N4/NH2-N-rGO photo-catalytic desulfurization composite was fabricated by wet impregnation and characterized by SEM, XPS, XRD, EIS, PL, FTIR, and UV-Vis. Characterization results showed that g-C3N4 and N-rGO in composites promoted the separation of electron-hole pairs under visible light. The photocatalytic performance of the catalyst was evaluated by the removal of 4, 6-dimethlydibenzothiophene under visible light irradiation. The desulfurization performance of HPMo-g-C3N4/NH2-N-rGO with good stability reached 99.8% in 60 min and 60 ℃, which was much higher than that of g-C3N4, HPMo-g-C3N4, and HPMo-g-C3N4/N-rGO. A possible photocatalytic desulfurization mechanism of HPMo-g-C3N4/ NH2-N-rGO was presumed by density functional theory combined with the experimental results. The developed application of the photocatalytic desulfurization strategy provides a new route for the large-scale processing of transportation fuels.