High purity ZnO nanocrystals were prepared by a one-step reactive ion exchange procedure Zn(NO3)2 and strong basic anion-exchange resins were used as the raw materials. The particle sizes of the nanocrystals were between 30 and 50nm. The products were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and ultraviolet—visible spectroscopy. The ZnO nanocrystals had a hexagonal wurtzite structure, whose ratio of length to diameter was more than 10:1. The synthesized ZnO powders were successfully used as catalyst materials for methyl orange photogradation.
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