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

A technology of iron oxide yellow and iron -oxide, which is used in the field of preparation of nanomaterials, can solve problems such as heating, insulation, and other effects of production cycle, simple process, and less types of types

Inactive Publication Date: 2012-08-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patents also have a common feature that energy-consuming processes such as heating and heat preservation are required during the reaction process.

Method used

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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

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Weigh FeSO4·7H 2 O analytically pure 14g (0.05mol), made into 1L aqueous solution, add 3.8g tartaric acid and 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 Hydrogen solution 8mL, continue to react at about 35°C for 90 minutes after addition. After suction filtration and washing, the precipitate was dried in an oven at 100°C to obtain a solid, which was taken out and ground to obtain about 4.6 g of nano iron oxide yellow. The particle size of the nano iron oxide yellow is about 30nm as measured by X-diffraction method and scanning electron microscope method.

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

Embodiment 2

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

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

Embodiment 3

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

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

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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 field of preparation of nanometer materials, in particular to a method for preparing nanometer iron oxide yellow or nanometer iron oxide red. Background technique [0002] The basic chemical expression of iron oxide is Fe 2 o 3 , which exist in many different forms such as α-type iron oxide and δ-type iron oxide, and different forms of iron oxide present different colors. Iron oxide is non-toxic and cheap, and is an important substrate with excellent performance widely used in various fields such as building materials, coatings, and rubber. When the particle size of iron oxide reaches the nanoscale level, since the specific surface area and surface energy will increase significantly with the decrease of particle size, the small size effect will be highlighted, especially the scattering ability and surface covering power of visible light waves will be reduced. It presents a certain "transparent" state; at the same ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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