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Cationic polyacrylamide-modified Fe3O4 magnetic flocculant and preparation method thereof

A technology of polyacrylamide and magnetic flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, organic materials/organic magnetic materials, etc., and can solve the secondary pollution of magnetic flocculant application range, complex flocculation process, high cost, etc. question

Inactive Publication Date: 2013-05-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the complex flocculation process of conventional flocculants, the existence of secondary pollution, and the limited application range and high cost of existing magnetic flocculants, one of the objectives of the present invention is to provide a cationic polyacrylamide-modified Fe 3 o 4 Preparation method of magnetic flocculant

Method used

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  • Cationic polyacrylamide-modified Fe3O4 magnetic flocculant and preparation method thereof
  • Cationic polyacrylamide-modified Fe3O4 magnetic flocculant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) Take 20 mg of cationic polyacrylamide with a weight average molecular weight of 3 million and an ion degree of 15, and add 100 g of it at a concentration of 0.1 mol L -1 , a phosphate buffer solution with a pH of 9.0, stirred at 100rpm for 60min to dissolve it completely; then add 100mg of magnetic nano-Fe to the reaction system 3 o 4 Particles, react at 20°C, 300rpm stirring speed for 5min;

[0050] (2) After absorbing the product with a permanent magnet, remove the supernatant, then add deionized water 800 times the weight of the product to wash for 5 times, then redisperse the washed product in deionized water, and ultrasonically treat it for 10 minutes to disperse it , forming a stable suspension to obtain cationic polyacrylamide-modified Fe 3 o 4 magnetic flocculant.

[0051] The average particle size of the obtained magnetic flocculant was 160 μm, the saturation magnetization was 68.4 emu / g, and the coercive force was 2.3 Oe.

[0052] Flocculation effect ...

Embodiment 2

[0055] (1) Take 60 mg of cationic polyacrylamide with a weight average molecular weight of 12 million and an ion degree of 30, add 100 g of it at a concentration of 0.15 mol L -1 , acetic acid buffer solution with a pH of 7.5, stirred at 200rpm for 80min to dissolve it completely; then add 100mg of magnetic nano-Fe to the reaction system 3 o 4 Particles were reacted at 28°C for 40 minutes at a stirring speed of 50 rpm;

[0056] (2) After absorbing the product with a permanent magnet, remove the supernatant, then add deionized water 900 times the weight of the product to wash for 3 times, redisperse the washed product in deionized water, and ultrasonically treat it for 5 minutes to disperse it. A stable suspension was formed to obtain cationic polyacrylamide-modified Fe 3 o 4 magnetic flocculant.

[0057] The average particle size of the obtained magnetic flocculant was 200 μm, the saturation magnetization was 71.0 emu / g, and the coercive force was 2.5 Oe.

[0058] Floccul...

Embodiment 3

[0061] (1) Take 10 mg of cationic polyacrylamide with a weight average molecular weight of 8 million and an ion degree of 40, and add 100 g of it at a concentration of 0.05 mol L -1 , a phosphate buffer solution with a pH of 7.0, stirred at 100rpm for 90min to dissolve it completely; then add 100mg of magnetic nano-Fe to the reaction system 3 o 4 Particles were reacted at 25°C for 10 minutes at a stirring speed of 150rpm;

[0062] (2) After absorbing the product with a permanent magnet, remove the supernatant, then add deionized water 1000 times the weight of the product to wash for 4 times, redisperse the washed product in deionized water, and ultrasonically treat it for 15 minutes to disperse it. A stable suspension was formed to obtain cationic polyacrylamide-modified Fe 3 o 4 magnetic flocculant.

[0063] The average particle size of the obtained magnetic flocculant was 120 μm, the saturation magnetization was 64.3 emu / g, and the coercive force was 2.1 Oe.

[0064] Fl...

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Abstract

The invention relates to a magnetic flocculant and a preparation method thereof, wherein the magnetic flocculant is cationic polyacrylamide-modified magnetic nanometer Fe3O4 particles. The magnetic flocculant provided by the invention retains the advantages of low dosage of organic high molecular flocculant, high flocculation speed, coexistence of salts, low pH value and temperature influence, low total amount of flocculating constituent and the like; and the superparamagnetism of the flocculant enables the flocculant to quicken the precipitation under the effect of an applied magnetic field and to realize quick and efficient separation of residual flocculant and flocculation. The magnetic flocculant provided by the invention has the advantages of simple preparation technique, low cost, easiness in amplification and no secondary pollution, and facilitates realizing efficient and economic flocculation operation.

Description

technical field [0001] The present invention relates to a kind of magnetic flocculant, specifically, the present invention relates to a kind of cationic polyacrylamide modified Fe 3 o 4 Magnetic flocculant and its preparation method. Background technique [0002] Flocculant is widely used in chemical industry, mining industry, environmental protection and other fields, in the process of solid-liquid separation and water treatment, to improve the sedimentation and filtration effect of fine solids. Flocculant, also known as settling agent, is a kind of substance that can coagulate and precipitate small solutes, colloids, and solid suspended particles in a solution that are not easy to settle. With the development of science and technology, the types of flocculants are also increasing. According to the different chemical components, they can be divided into inorganic, organic and microbial flocculants. [0003] Typical inorganic flocculants include aluminum salts and iron sa...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08F20/56C08F8/42H01F1/42
Inventor 刘春朝王仕楷王锋郭晨
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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