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Method for preparing efficient nano ferric oxide drinking water type flocculants

A nano iron oxide and flocculant technology, applied in iron oxide/iron hydroxide, nanotechnology and other directions, can solve the problems of easy residual iron ions, high aluminum ion content, secondary pollution of water bodies, etc. The effect of good particle dispersibility and reduced production cost

Inactive Publication Date: 2011-07-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the inorganic polymer flocculant polyaluminum chloride (PAC) accounts for more than 80% of the actual amount of flocculants in my country, but there is a high content of aluminum ions, which easily leads to secondary pollution of water bodies
While iron-based flocculants are popular for their high efficiency, they have the following disadvantages: 1. High dependence on pH; 2. Iron ions are easy to remain; The nano-effect has also received more and more attention in water treatment applications

Method used

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  • Method for preparing efficient nano ferric oxide drinking water type flocculants
  • Method for preparing efficient nano ferric oxide drinking water type flocculants
  • Method for preparing efficient nano ferric oxide drinking water type flocculants

Examples

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Embodiment 1

[0027] Take 200ml of FeSO with a concentration of 0.05mol / L 4 The solution was placed in a constant temperature water bath in a four-neck flask at 25°C, and N 2 After driving away the air in the bottle, add 200mL Na with a concentration of 0.05mol / L 2 CO 3 solution, the addition speed is 10mL / min, stir to make it fully mixed, the stirring speed is 3600r / min, and N 2 Switch to air, and the air flow rate is 2L / min to prepare nano-α-FeOOH. The initial stage of the reaction is a nucleation process, during which the pH of the solution is automatically maintained at a constant value of 6-7. When the pH of the system begins to drop, the nucleation process is over and the color of the mixed solution is yellow. After aging the solution containing α-FeOOH seed crystals for 2 h, the crystal growth continued. by dropping Na 2 CO 3 The pH of the solution control system is 4-5. After the reaction is completed, the resulting precipitate is repeatedly washed, heated and dried, and groun...

Embodiment 2

[0029] Take 200ml of FeSO with a concentration of 0.05mol / L 4 The solution was placed in a constant temperature water bath in a four-neck flask at a temperature of 35°C, and N 2 After driving away the air in the bottle, add 200mL Na with a concentration of 0.05mol / L 2 CO 3 solution, the addition speed is 10mL / min, stir to make it fully mixed, the stirring speed is 3600r / min, and N 2Switch to air, and the air flow rate is 2L / min to prepare nano-α-FeOOH. The initial stage of the reaction is a nucleation process, during which the pH of the solution is automatically maintained at a constant value of 6-7. When the pH of the system begins to drop, the nucleation process is over and the color of the mixed solution is yellow. After aging the solution containing α-FeOOH species for 2 hours, the crystal growth continued. by dropping Na 2 CO 3 The pH of the solution control system is 4-5. After the reaction is completed, the resulting precipitate is repeatedly washed, heated and dr...

Embodiment 3

[0031] Take 200ml concentration of 0.05mol / L FeSO 4 solution and Al 2 (SO 4 ) 3 18H 2 O solution, the mixed solution of Al / Fe-0.15 was placed in a constant temperature water bath in a four-necked flask, the temperature was at 35 °C, and N 2 After driving away the air in the bottle, add 200mL Na with a concentration of 0.05mol / L 2 CO 3 Aqueous solution, the addition speed is 10mL / min, stir to make it fully mixed, the stirring speed is 3600r / min, the N 2 Switch to air, and the air flow rate is 2L / min to prepare nano-α-FeOOH. The initial stage of the reaction is a nucleation process, during which the pH of the solution is automatically maintained at a constant value of 6-7. When the pH of the system begins to drop, the nucleation process is over and the color of the mixed solution is yellow. After aging the solution containing α-FeOOH seed crystals for 2 h, the crystal growth continued. by dropping Na 2 CO 3 The pH of the solution control system is 4-5. After the reacti...

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Abstract

The invention relates to a method for preparing efficient nano ferric oxide drinking water type flocculants, belonging to the technical field of preparation of inorganic nonmetal nano materials. In the invention, the nano alpha-FeOOH flocculant is prepared by a coprecipitation method and the aluminium and silicon doped nano alpha-FeOOH flocculant is prepared through doping and surface modification. Compared with the traditional preparation methods, the method has the following advantages: the method is simple and practical; the nano particle size distribution is uniform; the preparation process flow is short; the method is environment-friendly; the manufacturing cost is low; and the prepared flocculants have higher treatment effects on toxic and harmful pollutants (such as heavy metals, toxic and harmful organic matters and the like), humic acid, chroma and the like.

Description

technical field [0001] The invention relates to a preparation method of an efficient nanometer iron oxide flocculant and a preparation method of a modified nanometer iron oxide flocculant, belonging to the technical field of preparation of inorganic non-metallic nanometer materials. Background technique [0002] In recent years, the pollution of water environment has become more and more serious, which has not only caused a shortage of water resources, but also seriously threatened the safety of drinking water for the public, increasing the difficulty of water treatment, and more and more researches on flocculants for water treatment. At present, conventional flocculants can be divided into: inorganic flocculants and organic flocculants. Inorganic flocculants are widely used because of their wide sources. Among them, polyaluminum chloride (PAC), an inorganic polymer flocculant, accounts for more than 80% of the actual amount of flocculant used in my country, but there is a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02B82Y40/00
Inventor 田秉晖王秀辛丽花王国田贾大伟苏敏刘徽马玉涛
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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