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Controlled Synthesis of Zno/TiO2/ZnMoO4Micro/Nano Materials and Its Performance Study

Author: LiuZuo
Tutor: LvWei
School: Shandong University
Course: Chemical Engineering
Keywords: ZnO TiO2 NanO materials Photocatalytic ZnMoO4 Photoluminescence
CLC: TB383
Type: Master's thesis
Year: 2013
Downloads: 62
Quote: 0
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Abstract


21st century is full of challenges and opportunities, with the rapid development of the environment, information, energy, biotechnology, national defense and advanced manufacturing technology, new requirements for materials were inevitably proposed. The development trends of elements such as miniaturization, intelligence, high integration, high density storage put forward higher requests of the size of materials. The emergence of inorganic micro/nano materials will meet these new requirements. Because factors like morphology, size and structure have very important influences on the characteristics and applications of inorganic materials, synthesis of micro/nano materials by simple and economic methods, implementation the control of its structure, growth direction, dimension and size is the key to realize the large-scale production and application.Nanometer ZnO, nanometer TiO2and ZnMoO4plays important role in inorganic functional materials. Synthesis inorganic functional materials with good dispersibility and specific morphology in controll, and explore its performances have important theoretical and practical significance. In this paper, nano ZnO, ZnO/TiO2composite materials and ZnMoO4microcrystalline with certain morphologies and structures were purposely obtained by changing the reaction conditions or adjuvant type. The influence of experimental conditions on the microstructure and its growth mechanism were studied. Optical properties, photocatalytic performances and photoluminescence properties of the samples were discussed respectively. Specific research contents are as follows:1、Synthesis of nano ZnO globular clusters by complex-solvothermal methodNano ZnO globular clusters of hexagonal wurtzite structure were synthesised by changing the ratio of ethylene glycol/water in complex-solvent. Products have uniform size and good dispersion. The ratio of ethylene glycol/water has important effect on morphology and size of the products.The effect of the temperature on the size of ZnO is alternant. Prolong the reaction time to12hourr, size of nano ZnO is almost unchanged. The growth mechanism of the globular clusters conforms to nucleation, growth and assemble, finally gathered to ZnO nano globular clusters. The biggest ultraviolet absorption peak (λmax)of nano ZnO globular clusters has a slight red. Photoluminescence emission peaks are near414nm and466nm. ZnO nano clusters with smaller size has better catalytic efficiency.2、Preparation of TiO2/ZnO nanocomposite and its photocatalytic performanceHollow TiO2nanotube materials with neat and orderly arrangement were prepared by electrochemical anodic oxidation method in the presence of the F". Take TiO2nanotube materials as a substrate prepare clear core-shell structure of TiO2/ZnO nanocomposite under hydrothermal conditions. By analysising XRD we could find TiO2/ZnO nanocomposite has good crystal shape. The sunlight utilization has been improved by the composite of the TiO2/ZnO nanomaterials, and the photocatalytic performance is is higher than single TiO2, ZnO nano material. The content of Zn has large influence on the photocatalytic activity of TiO2/ZnO nanocomposite, this has great significance on improving the photocatalytic efficiency. The experimental results show that when the initial pH of methyl orange solution is3photocatalytic properties of TiO2/ZnO nanocomposite plays best.3、Preparation of morphology controllable ZnMoO4microcrystallineZnMoO4microcrystals with diffrent morphologies and structures have been successfully prepared via hydrothermal method. In the synthesis process, Cetyltrimethylammonium Bromide (CTAB), Sodium Dodecyl Sulfate(SDS) Polyvinyl Pyrrolidone-K30(PVP-K30) and Ethylene Diamine Tetraacetic Acid(EDTA) were added respectively. XRD, SEM, photoluminescence (PL) were used to characterize the as-obtained ZnMoO4microcrystals. The results suggest that the morphologies and structures of ZnMoO4microcrystal can be controlld by changing the type and dosage of the adjuvant or varying the reaction time. The PL spectra of ZnMoO4at room temperature showed that the luminous intensity are different and the luminous center are all around565nm.

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