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Preparation of Micro-nano Iron Trioxide by Biological Template Method

wallpapers Industry 2020-09-30

Using FeCl3 as the starting material, using different biological templates (quantitative filter paper, inner egg membrane), through impregnation and calcination, successfully prepared micro-nano Fe2O3 with physical morphology.

First use an electronic analytical balance to weigh a certain amount of FeCl3 in a beaker accurately, and dissolve it with deionized water to prepare a FeCl3 solution of corresponding concentration. Then, the quantitative filter paper was immersed in the above solution for 2 hours, and then removed and dried at 90°C. Finally, put the dried filter paper into a muffle furnace, calcine at a constant temperature for 2 hours at the corresponding temperature, take out the sample, and cool it naturally to obtain a micro-nano structure Fe2O3 product. Adjust the calcination temperature, FeCl3 concentration and different biological templates (inner egg membrane) to get Fe2O3 products under other conditions.

Discussion on synthesis mechanism:

The preparation of micro-nano materials by the biological template method is mainly a new method established based on physical impregnation and high-temperature calcination. It is also an experiment used under the premise that certain inorganic metal elements have good compatibility with natural biological templates. The chamber preparation method has a specific theoretical basis. There are a large numbers of hydroxyl groups on the surface of quantitative filter paper fibres, which can provide a suitable matrix for metal oxide precipitation. Regarding the mechanism of preparing micro-nano Fe2O3 crystals using filter paper as a template, we speculate that the synthesis mechanism includes the following three steps:

(1) Fe3+ in the solution is adsorbed to the surface of the filter paper fibre by adsorption.

(2) During the drying process, as the temperature increases, Fe3+ is hydrolyzed to form iron hydroxide.

(3) After the sample is calcined at high temperature, ferric hydroxide is decomposed into iron oxide, and the filter paper template is oxidized to be removed. Finally, a micro-nano iron oxide product with the morphology of the filter paper template is obtained.

The mechanism of preparing micro-nano Fe2O3 with inner egg membrane as the template is similar. As we all know, the inner membrane of an egg contains about 90% of the protein; the main components are collagen and ovalbumin. The protein is combined by peptide bonds to form a long polypeptide chain with a length of tens to hundreds of micron and a diameter of 1 to 2 μm. There are a large number of sites on the chain that can be combined with metal ions, which has a natural mineralization function. When the inner membrane of the egg is immersed in FeCl3, Fe3+ combines with the carboxyl anion of the protein to form a complex. After high-temperature treatment, it finally produces a morphology of the inner membrane of the egg. Micro-nano Fe2O3.

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Tag: Iron Trioxide