Low temperature synthesis of nanosized ZnNb2O6 photocatalysts by a citrate complex method
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Nanosized ZnNb2O6 photocatalysts (band gaps ~4.0 eV) were successfully synthesized via a citrate complex method. Their particle sizes ranged from 50 to 150 nm. The result of Mott–Schottky measurement revealed that the flat-band potential of ZnNb2O6 was ca. −1.3 V versus Ag/AgCl at pH 6.6. The photocatalytic activities of the samples for the degradation of methyl orange were evaluated under UV-light (λ = 254 nm). It was found that the sample obtained at 850 °C showed the highest photocatalytic activity due to its opportune crystallinity and surface area. Furthermore, ·OH radicals were detected as the major oxidation agents responsible for the decomposition of methyl orange.
KeywordsZnNb2O6 Nanoparticles Citrate complex method Photocatalysis
This work was supported by NNSFC (21177024 and U1033603), 973 Program (2011CB612314) and Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT0818).