Preparation method of nano iron oxide yellow or nano iron oxide red

The technology of iron oxide yellow and iron oxide red is applied in the field of preparation of nanomaterials, which can solve problems such as heating and heat preservation, and achieve the effects of short production cycle, good crystal shape and mild preparation conditions.

Inactive Publication Date: 2011-06-15
ZHEJIANG UNIV
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  • Preparation method of nano iron oxide yellow or nano iron oxide red
  • Preparation method of nano iron oxide yellow or nano iron oxide red
  • Preparation method of nano iron oxide yellow or nano iron oxide red

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[0031] Example 1

[0032] Weigh FeSO4·7H 2 O analytical pure 14g (0.05mol), make 1L aqueous solution, add 3.8g tartaric acid to mix well, add 6mol / L ammonia solution dropwise while stirring, until the pH value of the reaction system is 4.8, continue to add 20% peroxide dropwise while stirring 8mL of hydrogen solution, after the addition, continue to react for 90 minutes at about 35°C. After the precipitate is suction filtered and washed, it is dried in an oven at 100°C to obtain a solid, which is taken out and ground to obtain about 4.6 g of nanometer iron oxide yellow. The particle size of nano-iron oxide yellow is about 30nm measured by X-diffraction method and scanning electron microscope method.

[0033] The obtained solid is calcined in a muffle furnace at 900° C. for 1.5 h, taken out, and ground after cooling to obtain 4.0 g of nanometer iron oxide red. The particle size of nano iron oxide red is about 75nm measured by X-diffraction method and scanning electron microscope m...

Example Embodiment

[0034] Example 2

[0035] Weigh FeSO 4 ·7H 2 O analytical pure 140g (0.5mol), make 1L aqueous solution, add 48g citric acid, mix well, add 10% mass fraction of sodium hydroxide aqueous solution while stirring, until the pH of the system is 3.8, continue to add dropwise while stirring 250ml sodium hypochlorite aqueous solution with a mass fraction of 20%, after the addition, the reaction was continued for 2h at room temperature (25°C). After the precipitate is suction filtered and washed, it is placed at 30°C for vacuum drying for 1 hour to obtain a solid, which is taken out and ground to obtain about 48 g of nanometer iron oxide yellow. The particle size of nano-iron oxide yellow is about 35nm measured by X-diffraction method and scanning electron microscope method.

[0036] The solid obtained above is calcined in a muffle furnace at 800° C. for 1 h, taken out, and ground after cooling to obtain about 42 g of nano iron oxide red. The particle size of nano iron oxide red is about ...

Example Embodiment

[0037] Example 3

[0038] Weigh FeSO 4 ·7H 2 O analytical pure 140g (0.5mol) is mixed into 1L aqueous solution, add 13mL ethylene glycol and mix well, add 10% sodium hydroxide solution dropwise while stirring, until the pH value of the reaction system is 4.3, continue adding dropwise while stirring 300 mL of a sodium persulfate solution with a mass fraction of 30%, after the addition, continue to react at about 30°C for about 100 minutes to form a precipitate. After the precipitate is suction filtered and washed, it is placed at 35° C. and vacuum-dried for 1 hour to obtain a solid, which is taken out and ground to obtain about 44 g of nanometer iron oxide yellow. The particle size of nano-iron oxide yellow is about 40nm measured by X-diffraction method and scanning electron microscope method.

[0039] The obtained solid is calcined in a muffle furnace at 700° C. for 2 hours, taken out, cooled, and ground to obtain 40 g of nano iron oxide red. The particle size of nano iron oxide ...

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Abstract

The invention discloses a preparation method of nano iron oxide yellow or nano iron oxide red. The preparation method comprises the following steps: (a) adding a polymerization inhibitor in a ferrite solution with iron ion concentration of 0.05mol/L-1.2mol/L, and dropwise adding a precipitator until the pH value is 3.5-5.0 so as to form a reaction system; (b) continuously reacting for 90-120 minutes to obtain a product after dropwise adding an oxidant in the reaction system; (c) filtering the product obtained from the step (b), washing and drying the obtained filter cake so as to obtain the nano iron oxide yellow; and (d) firing the nano iron oxide yellow obtained from the step (c), cooling the fired nano iron oxide yellow to obtain the nano iron oxide red. By using the method, the particle size of the product can be effectively controlled between 20-100 nanometers, and the nano iron oxide yellow and nano iron oxide red are obtained by subsequent processing; and the method has the characteristics of simple process, small pollution, low energy consumption and short period.

Description

technical background [0001] The invention relates to the preparation field of nano materials, in particular to a preparation method of nano iron oxide yellow or nano iron oxide red. Background technique [0002] The basic chemical expression of iron oxide is Fe 2 O 3 There are many different forms such as α-type iron oxide and δ-type iron oxide, and different forms of iron oxide show different colors. Iron oxide is non-toxic and inexpensive, and is an important substrate with excellent performance in various fields such as building materials, coatings, and rubber. When the particle size of iron oxide reaches the nanometer level, because the specific surface area, surface energy, etc. will increase significantly with the decrease of the particle size, the small size effect will be highlighted, especially the scattering ability of visible light waves and the reduction of surface hiding power. Present a certain "transparent" state; at the same time, many potential physical and chem...

Claims

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Application Information

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IPC IPC(8): C01G49/06B82Y40/00
Inventor 郭伟强方卫民何雨舟郭沁冯晨虓刘阳
Owner ZHEJIANG UNIV
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