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A new visible photoactive catalyst (Cu, S/PEG-PVA/TiO 2 ) was synthesized by the sol-gel method. In addition, Cu, S/TiO 2  and Bare TiO 2  were synthesized to compare their properties and activities. The synthesized catalysts were characterized using XRD, N 2  adsorption–desorption measurements, SEM, TEM, EDX, UV-Vis spectroscopy and TGA. The photocatalytic activities of the synthesized photocatalysts were evaluated by measuring the photocatalytic degradation of 4-nitrophenol under visible light irradiation. Then, the impacts of three parameters, (catalyst loading, pH and H 2 O 2  concentration) for optimization and modelization of the 4-nitrophenol photodegradation were studied using the response surface methodology. Optimal conditions obtained from statistical analysis at a catalyst loading of 1 gL −1 , pH of 3.98 and H 2 O 2  concentration of 8 mg/L have shown the highest 4-NP percentage degradation of 70.5% in 1 h. The results predicted by the models were found to be in good agreement with those obtained by performing the experiment ( R2  = 0.9443 and Adj- R2  =  0.9038).

Sol-gel template synthesis of visible photoactive Cu-S co-doped mesoporous TiO 2 catalyst