Ferric oxide spheres woven by nano cubes and having micro nano structure, and preparation method thereof
A technology of ferric oxide balls and nano cubes, applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of high temperature, addition, etc., and achieve the effects of low reaction temperature, simple process, and convenient post-processing
Inactive Publication Date: 2014-02-26
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology
Recently, there are literature reports on the synthesis of ferric oxide with different micro-nano morphology, such as the synthesis of micro-nano structured ferric oxide by soft template and hard template method, but this process requires high temperature and the addition of organic reagents and templates
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[0019] Example: The preparation method of the micro-nano structure iron sesquioxide ball interwoven by nano-cubes comprises the following steps:
[0020] (1) First, dissolve 10 mmol of ferrous chloride tetrahydrate and 10 mmol of anhydrous sodium carbonate in 50 mL of deionized water, and obtain a uniform solution under stirring with a magnetic stirrer;
[0021] (2) Add the evenly stirred solution into the liner of a PTFE autoclave with a volume of 70 mL, then put the autoclave into an oven, heat it to 160 °C, and keep it warm for 10 hours;
[0022] (3) After the autoclave was naturally cooled to room temperature, the reaction product was taken out, washed repeatedly with deionized water and absolute ethanol until the aqueous solution was neutral, and finally the precipitate obtained by centrifugation was dried in an oven to obtain the precursor material.
[0023] (4) The dried precursor material was annealed at 500°C for 3 hours and then cooled to room temperature naturally...
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Abstract
The invention discloses ferric oxide spheres woven by nano cubes and having a micro nano structure, and a preparation method thereof. The ferric oxide spheres are mainly obtained by the steps of synthesizing precursor by using ferrous chloride tetrahydrate and natrium carbonicum calcinatum by a hydrothermal method, and annealing the precursor in air; in the reaction process that the ferric oxide spheres woven by the nano cubes and having the micro nano structure are prepared by the hydrothermal method, the ferric oxide spheres which have high crystallinity and the micro structure can be prepared under the condition that a dispersing agent and surfactant are not required to be added; template and other substance are not added in the preparation method, so the aftertreatment step is convenient to operate, reaction temperature is low, time is short, the process is simple and yield is high; and the preparation process is environment-friendly, and any toxic and harmful iron source and organic solvent are not used.
Description
technical field [0001] The invention relates to a micro-nano structured iron sesquioxide ball formed by interweaving nano-cubes and a preparation method thereof, belonging to the field of chemicals. Background technique [0002] Ferric oxide is an N-type semiconductor (Eg=2.2eV), which plays a very important role in industry and scientific research, for example, it is an excellent pigment, catalyst and magnetic recording material. Nanoparticles have attracted the attention of researchers due to their high specific surface area and high surface energy. However, nanoparticles are easy to agglomerate, thereby reducing the activity of the particles. At the same time, due to the small size of nanoparticles, they are not easy to recover in the liquid phase. Micron materials have large size and low activity, but are not easy to agglomerate and easy to recycle. Therefore, by synthesizing micro / nano-structured materials, the advantages of high activity and high specific surface of n...
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IPC IPC(8): C01G49/06
Inventor 刘岗汪国忠康升红王慧敏
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI