▎ 摘　　要

Photocatalytic behavior was investigated for TiO2-graphene nanocomposite in the degradation of acid orange 7 (AO7) as a model pollutant under ultraviolet light in aqueous solution. XRD, SEM, TEM, DRS, FT-IR and EDX techniques were used for the characterization of the prepared nanocomposite. The effect of synthesis variables such as weight ratio of TiO2 to graphene and operational key factors such as initial dye concentration, irradiation time, catalyst dosage and solution distance from UV lamp were studied in the photocatalytic degradation of AO7. This excellent catalytic ability is mainly attributed to the synergic effect of photocatalyst and adsorbent. The effect of operational variables was optimized for the photocatalytic degradation of AO7 as a pollutant model using the RSM technique. In this case, the amount of the determination coefficient (R-2 = 0.97) shows that 97% of the variability in the response could be described by the model. The maximum degradation efficiency (96%) was achieved at the optimum operational conditions: catalyst dosage of 0.5 g L-1, the irradiation time of 50 min and distance the solution from UV lamp of 0.3 cm.