This work reports the preparation of flower-like ZnO for applications in the catalytic oxidation of methyl orange (MO) in aqueous solution. The wurtzite ZnO samples with flower-like morphologies were obtained via a d-glucose-assisted sonochemical method. Effects of the presence of glucose, sonication times (0, 10, and 20 min) and calcination temperatures (300, 400, and 500 °C) on the morphology of the catalysts were investigated. Results from this work suggest that d-glucose played an important role in the formation of flower-like morphologies and the sonication processes further enhanced the flower-like characteristic ordering. The majority of ZnO samples prepared in this work had rather high photocatalytic activity after 45 min, with MO degradation greater than 85 % of the initial concentration. These results suggest that the photocatalytic activity of ZnO after 45-min reaction time correlates well with the specific surface area, and the number of oxygen vacancies present in the materials. The solubility of flower-like ZnO samples in the dye solution was measured to be 19.2 ppb after 24-h reaction time.
Research on Chemical Intermediates – Springer Journals
Published: Jun 19, 2012
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