Abstract:ZnO/NiO/ZnAl 2 O 4 mixed metal oxides were synthesized through a facile and environment-benign route in which solutions of appropriate amounts of metal salts were mixed with solutions of sodium hydroxide and sodium carbonate to obtain a series of hydrotalcite-like precursors. The precursors in the form of ZnNiAl layered double hydroxides (LDHs) were subject to calcination at suitable temperatures for the generation of composite oxides. The as-obtained samples were characterized by XRD,

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... SEM, TEM, EDS, BET and UV-Vis DRS techniques. The results indicate that there is the generation of well-crystalline ternary ZnO/NiO/ZnAl 2 O 4 photocatalysts high in surface area. The photocatalytic activity of the as-obtained materials was evaluated in the photocatalytic reduction of CO 2 under simulated sunlight irradiation. The effects of calcination temperature, amount of sacrificial agent and reaction time on the photocatalytic activity of the samples were investigated. The results indicated that ZnNiAl-LDH precursor calcined at 500 °C show the highest photocatalytic activity, the maximum yield of 2680 umol·g cat -1 methanol within 6 h was obtained with 0.04 mol of NaOH and Na 2 SO 3 , respectively. The mechanism of CO 2 photocatalytic reduction over ZnO/NiO/ZnAl 2 O 4 was discussed. were also prepared by co-precipitation method, which were used to reduce CO 2 and degrade methyl orange, and all of them showed remarkable properties [14, 15] . In this work, zinc, nickel, aluminum nitrate were used as the main raw materials to prepare the Zn-Ni-Al-LDH by hydrothermal method. The mixed oxides with high specific surface were obtained by the thermal treatment of LDH materials. The photocatalytic activity was evaluated by photocatalytic reduction of CO 2 , and the factors influencing the photocatalytic activity were explored, such as calcination temperature, sacrifice dosage and reaction time.