Synthesis of Cu-Supported ZSM-5/UiO-66 Composite Catalysts for Efficient Degradation of Methylene Blue

Cu-supported composite catalysts consisting of metal–organic frameworks (UiO-66) and ZSM-5 zeolite (Cu/ZSM-5/UiO-66, Cu–ZSM-5/UiO-66, and (Cu/ZSM-5)/UiO-66, respectively) were synthesized for the efficient catalytic wet peroxide oxidation (CWPO) of methylene blue (MB) wastewater. The Cu-active components were introduced by using incipient wetness impregnation method and one-step hydrothermal synthesis method. The composite catalysts were characterized by SEM, EDS mapping, XRD, and FT-IR. The catalytic activity can be affected by the ZSM-5 loading ratio and the Cu introduction method. Results indicated that the Cu/ZSM-5/UiO-66 composite catalysts exhibited the best catalytic activity for the CWPO degradation of MB wastewater (X_MB = 100%, X_H2O2 = 89%) compared with Cu–ZSM-5/UiO-66 catalysts (X_MB = 89%, X_H2O2 = 25%) and (Cu/ZSM-5)/UiO-66 (X_MB = 90%, X_H2O2 = 29%) which confirmed the controllable activity of the catalysts. No Cu leaching concentration was detected in the treated wastewater over the Cu–ZSM-5/UiO-66 and (Cu/ZSM-5)/UiO-66 catalysts which indicated the enhanced stability of the Cu species in the composite catalysts. The supported Cu composite catalysts showed good catalytic activity and high stability for the CWPO of MB wastewater which have potential application in dye wastewater treatment.