The photodegradation of an azo dye, Reactive Black 5 (RB5), as a model pollutant by graphitic carbon nitride, g-C3N4 nanosheets under visible and solar light irradiations was evaluated. The g-C3N4 nanosheets with the band gap of 2.7 eV was prepared by via the thermal condensation of urea. The photodegradation of RB5 dye by prepared g-C3N4 nanosheets was performed under different conditions including photocatalyst loading, pH, initial dye concentration, and irradiation source (Xe lamp and sunlight). Fig. 1 shows the influence of pH (3.4-9.0) on the degradation efficiency of RB5 by gC3N4 nanosheets at 25 o C under 90 min sunlight irradiation. The optimum photodegradation conditions were achieved by 0.04

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