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Magnetic covalent bond type chitosan-based modified flocculant and preparation method and application thereof

A technology of chitosan and covalent bond, which is applied in the field of magnetic covalent bond chitosan-based modified flocculant and its preparation, can solve the problem of high price of graphene oxide, unfavorable large-scale application, poor flocculation effect, etc. problems, to achieve good chemical stability, broaden the applicable range of pH, and improve the demulsification ability

Active Publication Date: 2021-07-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN111285435A discloses a recyclable graphene oxide-based quaternized chitosan demulsifier and its preparation method, wherein graphene oxide, quaternized chitosan and ferric iron tetroxide nanoparticles Prepare a new type of demulsifier. The demulsifier prepared by the invention has good demulsification performance and flocculation, but it needs to maintain a high reaction temperature in the synthesis process, and the price of the important raw material graphene oxide used is expensive, which is not conducive to Large-scale industrial application
[0007] From this point of view, the existing flocculants and demulsifiers modified based on chitosan have disadvantages such as poor lipophilicity, difficult separation, poor flocculation effect and high preparation cost.

Method used

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  • Magnetic covalent bond type chitosan-based modified flocculant and preparation method and application thereof
  • Magnetic covalent bond type chitosan-based modified flocculant and preparation method and application thereof
  • Magnetic covalent bond type chitosan-based modified flocculant and preparation method and application thereof

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preparation example Construction

[0040] The invention provides a method for preparing a magnetic covalent bond type chitosan-based modified flocculant, comprising the following steps:

[0041] (1) The magnetic Fe 3 o 4 The nanoparticles were dispersed in a mixed solvent of ethanol and water to obtain Fe 3 o 4 Dispersions;

[0042] (2) the Fe 3 o 4 The dispersion liquid is mixed with ammonia water to obtain basic Fe 3 o 4 Dispersions;

[0043] (3) the basic Fe 3 o 4 The dispersion is mixed with tetraethyl orthosilicate reaction to obtain Fe 3 o 4 @SiO 2 Material;

[0044] (4) the Fe 3 o 4 @SiO 2 Materials, ethanol and silane coupling agent are mixed for the first graft copolymerization reaction to obtain silane coupling agent grafted Fe 3 o 4 @SiO 2 ;

[0045] (5) the silane coupling agent grafted Fe 3 o 4 @SiO 2 , water, modified chitosan (MCS) and initiator are mixed to carry out the second graft copolymerization reaction, obtain magnetic covalent bond type chitosan-based modified fl...

Embodiment 1

[0061] (1) 2g magnetic Fe 3 o 4 Nanoparticles were added to a mixed solution of 200mL absolute ethanol and 50mL deionized water, and ultrasonicated for 20min until the magnetic nuclei were uniformly dispersed to obtain Fe 3 o 4 Dispersions;

[0062] (2) Add 8mL ammonia water to the Fe in step (1) 3 o 4 In the dispersion liquid, ultrasonic 10min to make it fully mixed, so that the pH of the mixed solution = 9 ~ 10, to obtain basic Fe 3 o 4 Dispersions;

[0063] (3) the obtained basic Fe in step (2) 3 o 4 Place the dispersion in a water bath, keep the temperature at 40°C, add 3 mL of tetraethylorthosilicate dropwise using a peristaltic pump, and stir electrically at 400 rpm for 6 hours. After the reaction is complete, magnetically separate the mixture. After washing with water, ethanol and deionized water for 3 times, vacuum drying at 60 °C for 12 h, Fe 3 o 4 @SiO 2 Material;

[0064] (4) the obtained Fe in step (3) 3 o 4 @SiO 2 Add 50mL of absolute ethanol, plac...

Embodiment 2

[0068] (1) 2g magnetic Fe 3 o 4 Nanoparticles were added to a mixed solution of 200mL absolute ethanol and 50mL deionized water, and ultrasonicated for 20min until the magnetic nuclei were uniformly dispersed to obtain Fe 3 o 4 Dispersions;

[0069] (2) Add 8mL ammonia water to the Fe in step (1) 3 o4 In the dispersion liquid, ultrasonic 10min to make it fully mixed, so that the pH of the mixed solution = 9 ~ 10, to obtain basic Fe 3 o 4 Dispersions;

[0070] (3) the obtained basic Fe in step (2) 3 o 4 Place the dispersion in a water bath, keep the temperature at 40°C, add 3 mL of tetraethylorthosilicate dropwise using a peristaltic pump, and stir electrically at 400 rpm for 6 hours. After the reaction is complete, magnetically separate the mixture. After washing with water, ethanol and deionized water for 3 times, vacuum drying at 60 °C for 12 h, Fe 3 o 4 @SiO 2 Material;

[0071] (4) the obtained Fe in step (3) 3 o 4 @SiO 2 Add 50mL of absolute ethanol, place ...

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Abstract

The invention belongs to the field of water treatment, and particularly relates to a magnetic covalent bond type chitosan-based modified flocculant and a preparation method and application thereof. According to the invention, a cationic monomer and a hydrophobic monomer are introduced into chitosan molecules through a graft copolymerization reaction, so that the flocculant is ensured to have good stability, the electricity neutralization capability and the demulsification capability on oil droplets of the flocculant in a flocculation process are improved, the solubility of the flocculant is increased, the pH application range of the flocculant is widened, the dosage is reduced, meanwhile, the nano Fe3O4 has superparamagnetism, the settling performance of floc can be remarkably improved under the action of an external magnetic field when the nano Fe3O4 is introduced into the flocculating agent, and the settling time is shortened. Results of the embodiment show that the flocculant provided by the invention is good in lipophilicity and excellent in flocculation performance, and has efficient oil-water separation capacity, wider pH application range and excellent recoverability.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a magnetic covalent bond type chitosan-based modified flocculant and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industry, the discharge of oily wastewater in industries such as petroleum exploration, mechanical processing, metallurgy, pharmaceuticals, and catering has become increasingly prominent. Oily wastewater has the characteristics of high concentration of organic matter, high toxicity, complex components, and poor biodegradability. Direct discharge will cause great harm to the environment and human health, and the oil in oily wastewater mainly exists in the form of emulsified oil, and the size of emulsified oil is small. , Strong stability, difficult to achieve oil-water separation by centrifugation or air flotation. [0003] At present, the commonly used treatment method for oily wastewater i...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08F251/00C08F220/56C08F226/02C02F1/56
CPCC08G83/001C08F251/00C02F1/56C08F220/56C08F226/02
Inventor 马江雅夏玮吴根宇丁磊孔艳丽张会文聂勇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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