Dissertation > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature

Photoluminescence and Visible-Light Photocatalysis of Ni2+, Co2+-Doped ZnO/ZnAl2O4 Composite Films Preparated Via Hydrotalcite-Like Precursors

Author YinZuo
Tutor YangLan
School Beijing University of Chemical Technology
Course Chemistry
Keywords Layered Precursor Zinc oxide Zinc-aluminum spinel Composite films Photoluminescence Visible Light Photocatalytic
CLC O611.3
Type Master's thesis
Year 2011
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Zinc oxide as a versatile direct wide band gap semiconductor material, has been a hot research topic in the field one, especially in recent years, doped zinc oxide due to its unique optical and electrical properties and potential applications in optoelectronic devices and equipment concern. Luminescence and photocatalytic properties of zinc oxide, such as in terms of light emission mostly ultraviolet emission and weaker blue emission, emission bands single; photocatalytic low light use, mostly for Photocatalysis Therefore, layered precursor coating Calcination prepared transition metal Ni the Co doped ZnO/ZnAl2O4 composite film, in order to improve the lack of zinc oxide materials in the luminescence and photocatalytic. XRD, SEM-EDS, HTEM, Raman, TPR, XPS, UV-vis and PL and other characterization methods of composite film material composition, structure, and photoluminescence properties of visible light catalytic performance study investigated the calcination temperature and Ni2, Co2 doping amount ZnO/ZnAl2O4 composite film photoluminescence (PL) and visible light catalytic performance, and to explore the relationship between them. Specific research results are as follows: 1, coprecipitation prepared steady NiZnAl-CO3-LDHs slurry coating technology coatings deposited on alumina substrate NiZnAl-CO3-LDHs precursor calcined at 900 ℃ Ni2 doped ZnO composite film / ZnAl2O4. UV-vis spectroscopy showed that, Ni2 doped content of less than 4.3 mo1% Ni2 all entered the complex host lattice, and exist in the form of two ligand tetrahedral field with octahedral field, the Ni2 incorporation of the composite matrix the absorption band edge of redshift. PL test results prove that the Ni content of 4.3 mo1% Ni2 doped ZnO/ZnAl2O4 emission spectra of the composite films presented multimodal emission enhanced zinc oxide near the band edge emission and red emission, but also because the introduction of d electrons , center wavelength emission band at 591 nm and 618 nm, yellow and orange. 2 to CoZnAl-CO3-LDHs precursor the Co2 to doping ZnO/ZnAl2O4 composite materials obtained by calcination at 600-800 ℃. Through the regulation of feeding ratio and calcination temperature, to examine its structure and morphology of its photocatalytic properties; and examine the materials in form, such as powders, films, photocatalytic performance. Visible light photocatalytic degradation of methylene blue experiments show that the Co / Zn ratio is the highest catalytic activity obtained by calcining 0.05:3,600 ℃ the Co2 doping ZnO/ZnAl2O4 powder material visible light, up to 86.4%, the corresponding film material visible light photocatalytic degradation rate reached 71.7%

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