Abstract
The morphologies of ZnO with various microstructures synthesized by a facile solution-phase method using different molar ratios of zinc nitrate hexahydrate (Zn(NO3)2) to hexamethylenetetramine (HMTA) and trisodium citrate were investigated. It revealed that the molar ratio of Zn(NO3)2 to HMTA plays a significant role in the formation of hollow ZnO microstructures. Meanwhile ZnO with rod-like, flower-like or spherical-like microstructures can be nicely tailored by varying the molar ratio of Zn(NO3)2 to HMTA and trisodium citrate during growth process. In addition, the photocatalytic decolourization of aqueous solution of methyl orange in the presence of various morphological ZnO powder was investigated under ultraviolet light irradiation. The results showed that hollow ZnO microstructures had extremely high photocatalytic activities compared with those of solid ZnO samples. This remarkable photolytic activity is mainly due to their unique hollow structures, which resulting in larger surface area to volume ratio.
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