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Effects of calcination temperature and heating rate on the photocatalytic properties of ZnO prepared by pyrolysis.
Journal of Colloid and Interface Science 2018 January 2
A series of ZnO nanorods were prepared by pyrolysis of zinc acetate at different calcination temperatures and heating rates under ambient atmosphere. The as-prepared ZnO nanorods were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic performances of the ZnO nanorods were evaluated by the photodegradation of methyl orange (MO) and 4-nitrophenol (4-NP). The morphology, optical property, surface composition, and photocatalytic performance of the ZnO samples were affected by both calcination temperature and heating rate. The photocatalytic activity of the ZnO sample was obviously decreased with increased heating rate, which might be ascribed to the simultaneous decrease of oxygen vacancies and surface adsorption oxygen species. The ZnO nanorods prepared at 300°C with a heating rate of 1°C/min exhibited good photocatalytic activity and photochemical stability, allowing good potential practical application in environmental remediation.
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