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Magnetic decoloration material and preparation method thereof

A magnetic and ferromagnetic technology, applied in the field of magnetic decolorization materials and its preparation, can solve the problems of difficult large-scale promotion and high cost, and achieve the effect of simple and reliable method, low energy consumption, and reusable harmless treatment

Active Publication Date: 2016-10-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane treatment has a good effect on the decolorization of various pigments, but the cost is high and it is difficult to carry out large-scale promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Deep decolorization of coking sewage by using ferric oxide nanoparticles

[0028] Take 27.8g ferrous sulfate heptahydrate and 3.99g ferrous sulfate to prepare 50mL solution, then add 200mL ammonia solution (100mL concentrated ammonia water and 100mL deionized water), and stir vigorously for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly precipitates to the bottom of the beaker, pour off the water and impurities in the upper part, and use deionization to wash 2-3 times to obtain high-purity Fe3O4 nanoparticles. 2g of ferric oxide particles were dispersed in 20 mL of deionized water and activated with 1 mL of 28% ammonia water and 0.5 mL of concentrated sulfuric acid (50 wt%). Add this material in an amount of 0.1% (mass ratio) to the coking sewage with a chromaticity greater than 1400CU, and use sulfuric acid to adjust the pH value of the solution to 3.2. After fully stirring fo...

Embodiment 2

[0029] Example 2: Using commercially available magnetite powder to achieve deep decolorization of coking sewage

[0030] Take 5.0 g of refined magnetite powder with a particle size of over 1000 mesh, disperse it into a beaker filled with 50 mL of deionized water, add 1 mL of 36% hydrochloric acid and stir for 20 min, then add ammonia water to neutralize to pH = 8, and then use a magnetic field to The magnetite powder settles to the bottom of the beaker, and the supernatant water containing non-magnetic particles is poured out while maintaining the magnetic field. Add it to the coking sewage whose chromaticity is greater than 1400CU, and use sulfuric acid to adjust the pH value of the solution to 3.2. After fully stirring for 20 minutes, place the solution on the top of the magnet. After 30 minutes, release the clear water under the condition of maintaining the magnetic field, and measure the chromaticity of the clear water 92 CU. After the clean water is completely released, ...

Embodiment 3

[0031] Example 3: Using Modified Fe3O4 Nanoparticles to Realize Deep Decolorization of Coking Sewage

[0032]Take 27.8g of ferrous sulfate heptahydrate and 39.9g of ferrous sulfate to make 50mL solution, then add 100mL ammonia solution (50mL 328% ammonia water and 50mL deionized water), and stir vigorously for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly precipitates to the bottom of the beaker, pour off the water and impurities in the upper part, and use deionization to wash 2-3 times to obtain high-purity Fe3O4 nanoparticles. Take 50g of nanometer iron ferric oxide, add 10mL of ammonia water, 50mL of ethanol and 200mL of ammonia water, stir vigorously with mechanical stirring, then add 5g of tetraethyl orthosilicate to modify the iron powder, add 2g of triethoxy Propylaminosilane, to bring amino groups on the surface of the particles, and then use a magnetic field to separate the material, a...

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PUM

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Abstract

The invention relates to the technical field of water treatment, in particular to a magnetic decoloration material and a preparation method and application thereof. By means of the characteristic that most sewage pigment has negative charge, surface modification is carried out on an iron magnetic material, quaternary ammonium salt, quaternary phosphonium salt and quaternary arsonium salt with different carbon chain lengths are grafted to the surface of the iron magnetic material, and therefore pigment molecules dispersed in water are adsorbed and enriched. After pigment is completely adsorbed to the surface of the magnetic material, a high-gradient magnetic field is used for rapidly separating iron magnetic particles with pigment molecules adsorbed from sewage, and high-chroma sewage is decolored; the magnetic particles with the pigment molecules adsorbed are appropriately eluted so as to recycle magnetic materials, and meanwhile the pigment molecules are concentrated; finally, the concentrated pigment molecules are incinerated at high temperature or decomposed trough microwaves to achieve harmless treatment. The method is simple, reliable and low in energy consumption, the magnetic particles can be repeatedly utilized, and harmless treatment of poisonous and harmful pigment can be achieved. The magnetic decoloration material can be used for decoloring coking sewage and dyeing sewage before drainage.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a magnetic decolorizing material and a preparation method and application thereof. Background technique [0002] When treating sewage containing pigments, such as printing and dyeing and coking sewage, it is the key to make the discharge water meet the standard by choosing an appropriate process to decolorize it. Generally, there are several methods for decolorizing sewage, such as adsorption decolorization, flocculation decolorization, chemical oxidation decolorization, electrochemical oxidation decolorization, biodegradation decolorization and membrane separation decolorization. In practical applications, a single treatment method often cannot achieve good results. In order to obtain a good decolorization effect, the above two or more methods are often used in combination. [0003] In practical application, it is found that these decolorization methods have certain def...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/26B01J20/28B01J20/30C02F1/28C02F9/12
CPCB01J20/02B01J20/06B01J20/103B01J20/22B01J20/261B01J20/262B01J20/28009B01J2220/46B01J2220/4806B01J2220/4812C02F1/281C02F1/285C02F1/288C02F1/48C02F9/00C02F2101/308C02F2301/08
Inventor 杨虎邹伟李嘉颜杰陈炯朱胜兰苏桂萍杨益祥
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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