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A kind of preparation method of amphiphilic cationic chitosan-based magnetic flocculant

A technology of cationic chitosan and magnetic flocculant, applied in separation methods, magnetism of organic materials/organic magnetic materials, chemical instruments and methods, etc., can solve the problems of easy floating of emulsified oil drop flocs, narrow flocculation window, and treatment effect Poor and other problems, to achieve the effect of cationic charge density and hydrophobicity enhancement, enhanced flocculation effect

Active Publication Date: 2018-10-16
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, patents and literature have reported some preparation and application of chitosan-based flocculants, but there are still the following problems: (1) CS has a narrow flocculation window in the treatment of oily sewage, and the charge is often the main effect. Oil droplets will redisperse, and the treatment effect of oily sewage with low surface charge density of oil droplets is often not good; on the other hand, the formed emulsified oil droplet flocs are easy to float, so the separation efficiency of flocs and water bodies is low (Ahmad A L, et al. Chem Eng J, 2006, 118, 99-105; Bratskaya S Y, et al. Colloid Surf A, 2006, 275, 168-176; Zhao X F, et al. Sep Purif Technol, 2008, 62, 199-204)
(2) Graft copolymers of CS (or carboxymethyl chitosan) and hydrophilic monomers such as acrylamide (AM) or methacryloxyethyltrimethylammonium chloride (DMC) (CN 101880356 A ; CN 103387279 A; CN1654497A), although its molecular chain length and charge density have been improved, and the flocculation effect of emulsified oil droplets has been enhanced to a certain extent, it still cannot fundamentally solve the problem of low floc separation efficiency

Method used

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  • A kind of preparation method of amphiphilic cationic chitosan-based magnetic flocculant
  • A kind of preparation method of amphiphilic cationic chitosan-based magnetic flocculant
  • A kind of preparation method of amphiphilic cationic chitosan-based magnetic flocculant

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Synthetic example 1

[0026] Synthesis example 1: 2g FeCl 3 ·6H 2 O. Dissolve 4g of anhydrous sodium acetate and 12g of hexamethylenediamine in 80mL of ethylene glycol, then transfer the above solution to a 100mL autoclave, and react at 200°C for 8h. After repeated washing with ethanol and water for 3 times, the surface amine-modified Fe 3 o 4 Magnetic nanoparticles: take 0.1 g of the above magnetic nanoparticles and disperse them in 20 mL of glutaraldehyde aqueous solution (concentration is 5%), sonicate at 25 ° C for 20 min, and wash repeatedly with water for 3 times to obtain surface aldehyde-modified Fe 3 o 4 magnetic nanoparticles.

Embodiment 1

[0028] Add 2.0 g of chitosan (molecular weight: 350,000) and 100 mL of 1% acetic acid aqueous solution to a 500-mL reactor equipped with a stirrer and a temperature controller, dissolve completely under stirring and heat to 30° C. After 30 minutes of exhausting oxygen with nitrogen gas, 0.08 g of cerium ammonium nitrate was added for pretreatment for 5 minutes, and then 4.0 g of methacryloxyethyl dimethyl benzyl ammonium chloride and 4.0 g of acrylamide were added to the above-mentioned chitosan solution to carry out Graft copolymerization reaction 5h. The obtained product is precipitated with acetone, separated and purified to obtain an amphiphilic cationic chitosan graft copolymer. Dissolve 0.5g chitosan graft in 100mL water, and then surface aldehyde-modified Fe 3 o 4 The magnetic nanoparticle dispersion (0.2 g magnetic particles) was added dropwise to the aqueous solution of the chitosan graft, and stirred ultrasonically at 30° C. for 6 h. The magnetic nanoparticles wer...

Embodiment 2

[0030]Add 2.0 g of chitosan (molecular weight: 350,000) and 100 mL of 1% acetic acid aqueous solution into a 500-mL reactor equipped with a stirrer and a temperature controller, dissolve completely under stirring and heat to 80° C. After 30 minutes of exhausting oxygen with nitrogen, add 0.04g of potassium persulfate for pretreatment for 5 minutes, then add 8.0g of methacryloyloxyethyl dimethyl butyl ammonium chloride to the above chitosan solution, and carry out graft copolymerization reaction for 3 hours . The obtained product is precipitated with acetone, separated and purified to obtain an amphiphilic cationic chitosan graft copolymer. Dissolve 0.5g of chitosan grafts in 100mL of water, and then surface aldehyde-modified Fe 3 o 4 The magnetic nanoparticle dispersion (0.2g magnetic particles) was added dropwise into the aqueous chitosan graft solution, and stirred ultrasonically at 10°C for 10h. The magnetic nanoparticles were recovered by a magnet and washed three times...

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Abstract

The invention provides a preparing method for an amphiphilic positive ion and chitosan based magnetic flocculating agent. According to the method, graft copolymerization is carried out on chitosan and an amphiphilic positive ion monomer to prepare an amphiphilic positive ion and chitosan graft copolymer, and the amphiphilic positive ion and chitosan graft copolymer is further bound to the surfaces of Fe3O4 nanometer particles modified by an aldehyde group to prepare the amphiphilic positive ion and chitosan based magnetic flocculating agent. When the flocculating agent is used for treating emulsifying oil sewage, flocculating agent molecular chains can be pushed under the static effect and the hydrophobic effect to be efficiently adsorbed to the surfaces of emulsifying oil drips and the surfaces of solid suspended particles to accelerate formation and growth of a flocculent body and fast separate the flocculent body under the effect of an external magnetic field. The obtained amphiphilic positive ion and chitosan based magnetic flocculating agent is excellent in flocculating efficiency and has a wide prospect in application to the field of emulsifying oil sewage treatment.

Description

technical field [0001] The invention relates to the synthesis of an amphiphilic cationic chitosan-based magnetic flocculant, in particular to the preparation and application of a magnetic chitosan graft copolymer flocculant suitable for oily sewage treatment. Background technique [0002] The composition of oily sewage is complex. In addition to oily esters, it also contains many solid suspended particles, and the salinity is usually high. If it is discharged directly, it will seriously pollute the water body. Therefore, oily sewage must be strictly treated before discharge. Oily sewage comes from a wide range of sources. In addition to oil and gas exploration, storage, transportation and processing industries, it also comes from many other industries such as food, catering, cosmetics production, pharmaceuticals and mechanical processing. Although the composition of oily sewage produced by different industries and departments is different, a considerable part of oily sewage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/34C08F220/56C08F220/54C08F8/42H01F1/42C02F1/56C02F1/40C02F9/12
CPCC02F1/40C02F1/48C02F1/56C02F9/00C08F8/42C08F251/00C08F2800/20H01F1/42C08F220/34C08F220/56C08F220/54
Inventor 吕挺赵红挺张爽张川张栋张尔攀
Owner HANGZHOU DIANZI UNIV
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