Dissertation
Dissertation > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements ) > Zinc Zn

A Research on the Microstructure and Photocatalytic Performance of Fe-doped Zinc

Author DuYanYan
Tutor QiYang
School Northeastern University
Course Materials Physics and Chemistry
Keywords Photocatalysis Fe-doped ZnO Microstructure Hydrothermal method
CLC O614.241
Type Master's thesis
Year 2013
Downloads 12
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Metal oxide semiconductors based photocatalytic technology has attracted more and more attention because of its oxidative decomposition of organic pollutants, reduction of heavy metal ions, deodorization, antiseptic and sterilization like multiple features. Moreover, it can be used for the handling and recycling of hazardous substances, environment improvement and protecting the ecological environment.Zinc oxide (ZnO) as a typical direct wide bandgap semiconductor material of Ⅱ-Ⅵ group, has a band gap energy of3.4eV and a large exciton binding energy up to60meV Because of its excellent optical properties, ZnO has been successfully used in many fields, such as gas sensors, solar cells, optical detectors, and photocatalysis. The photocatalytic technology is one of the most important applications of ZnO nanomaterials. Studies show that transition metal ion doped-ZnO can significantly improve the performance of the photo catalyst.In this paper, Fe-doped ZnO powder prepared by a hydrothermal method was chosen for study. The microstructure of Fe-doped ZnO is studied by changing the iron (Fe) doping concentration, reaction temperature and reaction time. The phase composition, surface morphology, microstructure and absorption spectra were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and grating spectrometer, respectively. The main results obtained in this study are as follows:(1) The obtained Fe-doped ZnO products have optimum preparation conditions, when the reaction temperature, time and doping concentration was150℃,10h, and1.0mol%, respectively. The flower-like Fe-doped ZnO nanostructures were grown with more complete crystalline structure and appearance. However, the EDS analysis results showed that, as the concentration of Fe-doped ZnO vary from0to5mol%, the atomic ratio of Zn and Fe have no regular pattern. It indicates that the Fe ions were not uniformly distributed and dispersed in the ZnO samples; therefore the presence of Fe ions in the ZnO crystal lattice or crystal and their contribution in the growth of ZnO was unclear. (2) Comparative study results obtained by absorption spectra of photocatalytic degradation of methylene blue aqueous solution by ZnO products with different Fe-doping concentration showed that, when the doping concentration of Fe in ZnO was1.0mol%, the maximum absorption wavelength of methylene blue degradation rate reached up to95.4%, which was maximum among all ZnO doped products. While the degradation rate of undoped ZnO was found to be minimum with value69.9%.

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