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Preparation and Application of Nano-oxide by Photosynthetic Bacterium

Author: HuJing
Tutor: BaiHongJuan
School: University of North
Course: Environmental Engineering
Keywords: copper oxide iron oxide photosynthetic bacterium nanomatrerial catalysis
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 58
Quote: 0
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Abstract


The nanocrystalline copper oxide and iron oxide powders were prepared in this paper on the basis of direct precipitation method with copper acetate and iron nitrate respectively as the raw materials, sodium hydroxide as the precipitating agent, and culture fluid from photosynthetic bacterium as dispersant. The structure and properties of the products were characterized by thermal gravimetry-differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and fourier infrared spectrum (FT-IR). The optimum conditions of preparation of the nano-paticles oxide were obtained. The results indicated that the nano-oxide particles produced were spherical and their dispersancy is better through the control of reaction conditions, by the culture fluid from photosynthetic bacteria. The average size of copper nano-oxide was 38.6 nm, and the iron nano-oxide was 17.4 nm.Meanwhile, the protein content of culture fluid from photosynthetic bacterium in different periods were tested by Coomassie brilliant blue G-250 method, and the tendency of the protein content was obtained. The variety of protein in the culture fluid were tested by SDS-polyacrylamide gelelectrophoresis method, and the results were analyzed.Finally, the catalytic effect of the thermal decomposition of ammonium perchlorate was studied with the nano-copper oxide prepared before as catalyst. Through the experiment, the addition of nano-copper oxide caused the low temperature and the high temperature of thermal decomposition of ammonium perchlorate both ahead of time, but it didn’t significantly affect on the phase transition temperature of ammonium perchlorate. Meanwhile, the more the amount of nano-copper oxide added, the more the catalytic effect of the thermal decomposition of ammonium perchlorate obvious. It was found that the catalytic effect was better through nano-copper oxide prepared before than the normal copper oxide. It is showed that the nano-particles of copper oxide not only can be prepared by photosynthetic bacteria, but also the catalytic effect of the nano-particles of copper oxide prepared was very excellent, with a certain practicality.

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