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This study aimed to evaluate the photocatalytic activity of ZnO and Nb 2 O 5 catalysts, both supported on NaX zeolite and activated charcoal (AC). The synergistic effect between oxide and support and the influence of solution pH (3, 7 and 9) on photocatalytic degradation of reactive blue 5G (C.I. 222) were analyzed. The catalysts Nb 2 O 5 /NaX, Nb 2 O 5...