Nano-iron powder prepn. method
A technology of nano-iron powder and iron powder, applied in the direction of coating, etc., can solve the problems of low safety, many steps, complicated operation, etc., and achieve the effect of convenient process, simple equipment, and simple post-processing
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Embodiment 1
[0017] Embodiment 1: Preparation of iron nanopowder in ethanol solvent
[0018] 4.0g FeCl 3 ·6H 2 Dissolve O in 20ml ethanol, add 15.0g NaOH and 10.0ml 80% hydrazine hydrate solution, stir until uniform; heat the above mixture at 100°C to reflux for 12h, the mother liquor becomes colorless and transparent, and the reaction can be completed; Separation, washing, and vacuum drying yielded gray-black powder.
[0019] It was proved by X-ray diffraction that the gray-black powder was pure phase α-Fe; the transmission electron microscope showed that the sample was in the shape of small squares, the particle size was uniform, and the average size was about 120nm. It can be seen that the product prepared in this example is a pure-phase α-Fe nanopowder.
[0020] Take the mother liquor after separating the iron powder, after acidification, use SCN - Color development, no Fe 3+ The characteristic color, indicating that the Fe in the mother liquor 3+ content below 10 -5 mol / l, indi...
Embodiment 2
[0022] Embodiment 2: Preparation of iron nanopowder in water solvent
[0023] 4.0g FeCl 3 ·6H 2 Dissolve O in 20ml of water, add 20.0g of NaOH and 20.0ml of 80% hydrazine hydrate solution, stir until uniform; heat the above mixture to reflux at 120°C for 12h, the mother liquor becomes colorless and transparent, and the reaction can be completed. The product was separated, washed, and dried in vacuum to obtain a gray-black powder.
[0024] The X-ray diffraction pattern of the product proves that the gray-black powder is pure phase α-Fe; the transmission electron microscope shows that the sample is in the shape of small squares, the particle size is uniform, and the size is about 250nm. It can be seen that what is prepared in this example is pure-phase nano-iron powder.
[0025] Take the mother liquor after separating the iron powder, after acidification, use SCN - Color development, no Fe 3+ The characteristic color, indicating that the Fe in the mother liquor 3+ content ...
Embodiment 3
[0028] Embodiment 3: Preparation of iron nanopowder in alcohol-water mixed solvent
[0029] Get the mother liquor 15ml that contains alkali after separating the product in Example 1, add 10ml water and 8.0g NaOH, obtain alcohol-water mixed solution; Then, add 4.0g FeCl 2 4H 2 O and 20.0ml of 50% hydrazine hydrate solution, stirred evenly; the above mixture was heated to reflux at 100°C for 11h, the mother liquor became colorless and transparent, and the reaction was completed. The product is magnetically separated, washed, and dried in vacuum to obtain a gray-black powder.
[0030] X-ray diffraction proves that the obtained product is pure-phase α-Fe; the transmission electron microscope characterizes that the sample is in the shape of small squares, with uniform particle size and an average size of about 180nm. It shows that the gray-black powder prepared in this example is nano-iron powder.
[0031] Take the mother liquor after separating the iron powder, after acidificat...
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