Synthesis and highly efficient photocatalytic activity of mixed oxides derived from ZnNiAl layered double hydroxides
(1. College of Chemistry and Chemical Engineering,
Hunan Institute of Science and Technology, Yueyang 414006, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
3. College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China)
Hunan Institute of Science and Technology, Yueyang 414006, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
3. College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China)
Abstract: ZnO/NiO/ZnAl2O4 mixed-metal oxides were successfully synthesized through a hydrotalcite-like precursor route, in which appropriate amounts of metal salts solutions were mixed to obtain a new series of ZnNiAl layered double hydroxides (LDHs) as precursors, followed by calcination under different temperatures. The as-obtained samples were characterized by SEM, HRTEM, TEM, XRD, BET, TG-DTA, and UV-Vis spectra techniques. The photocatalytic activities of the samples were evaluated by degradation of methyl orange (MO) under the simulated sunlight irradiation. The effects of Zn/Ni/Al mole ratio and calcination temperature on the composition, morphology and photocatalytic activity of the samples were investigated in detail. The results indicated that compared with ZnNiAl-LDHs, the mixed-metal oxide showed superior photocatalytic performance for the degradation of MO. A maximum of 97.3% photocatalytic decoloration rate within 60 min was achieved from the LDH with the Zn/Ni/Al mole ratio of 2:1:1 and the calcination temperature of 500 °C, which much exceeded that of Degussa P25 under the same conditions. The possible mechanism of photocatalytic degradation over ZnO/NiO/ZnAl2O4 was discussed.
Key words: ZnNiAl layered double hydroxide; mixed oxide; photocatalytic degradation; phototatalytic activity