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Chitosan-based composite membrane and preparation method thereof

A technology of chitosan and composite membrane, which is applied in the field of membrane materials to achieve the effect of high super-hydrophilic performance

Pending Publication Date: 2022-04-05
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although the technical route of using sulfonated polyarylether sulfone as the base membrane to attach chitosan and the blending of the two has been studied in depth, the composite membrane material using chitosan as the base membrane and attaching sulfonated polyarylether Research is still blank

Method used

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  • Chitosan-based composite membrane and preparation method thereof
  • Chitosan-based composite membrane and preparation method thereof
  • Chitosan-based composite membrane and preparation method thereof

Examples

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preparation example Construction

[0084] In some embodiments, the preparation method of the composite membrane with alternate double-sided adhesion of the sulfonated polyarylether and chitosan layers comprises: immersing the chitosan-based membrane in an aprotic polar solvent used to dissolve the sulfonated polyarylether. solvent, repeated 3 times, and then immersed in the sulfonated polyarylether solution for 2 hours. The membrane was taken out, immersed in the same solvent, repeated 3 times, then immersed in deionized water, repeated 3 times, and then immersed in the chitosan-based membrane solution for 2 hours. Then immerse in deionized water and alkaline aqueous solution in turn, and then soak in deionized water for 3 times. Repeat the above operations to obtain a double-sided multilayer adhesive composite film. Wherein, the chitosan-based membrane solution includes a solution obtained by mixing chitosan, an acid such as acetic acid, a volatile agent such as 95% ethanol, a porogen such as PEG400, and wate...

Synthetic example 1

[0114] Synthesis Example 1-Synthesis Example 7

[0115] Preparation of sulfonated polyphenylsulfone (salt form):

[0116]

[0117] Take the preparation of sulfonated polyphenylsulfone with 20% sulfonation degree as an example: before starting the reaction, the raw materials are pretreated, DCDPS and BP are dried in a vacuum oven at 55°C for 12h, K 2 CO 3 , SDCDPS was dried in a vacuum oven at 120°C for 12 hours. Under nitrogen (99.999%, flow rate: 10-15) atmosphere, 9.82g bis(4-chloro-3-sulfonated phenyl)sulfone (SDCDPS), 22.97g4,4'-dichlorodiphenylsulfone (DCDPS) and 18.62 g biphenol (BP) was added to a 500mL straight three-necked flask equipped with a water separator, a serpentine condenser, an elbow, a stirring paddle and an air duct, and then 128mL N,N-dimethylacetamide (DMAc ), 64mL toluene (Tol), 15.89g anhydrous potassium carbonate were added thereto. DMAc is used as a solvent, anhydrous potassium carbonate is used as an acid-binding agent, and toluene is used as...

Synthetic example 8

[0123] Synthesis Example 8-Synthesis Example 27

[0124] Preparation of chitosan-based membrane:

[0125] According to a certain ratio (see Table 3 for details), 95% ethanol, acid acetic acid, water, porogen PEG400 and chitosan (95% degree of deacetylation) of different qualities are mixed, stirred for a certain period of time (see Table 3 for details), and obtained Chitosan-based membrane solution, that is, casting solution. The solution was left to defoam in an ultrasonic instrument for one hour, and the drying platform was calibrated horizontally in advance, and a certain volume of casting solution (see Table 3 for details) was weighed and poured on a clean glass plate (10×10cm), so that It expands to the same size as the carrier. Then dry in an infrared light box at 80°C for 24 hours, until all the solvents are completely evaporated; then immerse the film in a 10% sodium hydroxide solution for 1 hour, then transfer to distilled water for immersion, and wait until the fil...

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Abstract

The invention provides a chitosan-based composite membrane and a preparation method thereof. The chitosan-based composite membrane comprises a chitosan-based membrane and sulfonated polyaromatic ether attached to the chitosan-based membrane. According to the composite membrane, chitosan is used as a base membrane, sulfonated polyaromatic ether is attached to the chitosan base membrane in an electrostatic mode, and the composite membrane has the high rejection rate, the high water flux and the high anti-pollution capacity.

Description

technical field [0001] The invention relates to the field of membrane materials, in particular to a chitosan-based composite membrane and a preparation method thereof. [0002] technical background [0003] Sulfonated polyaryl ether is a polyaryl ether polymer compound containing sulfonic acid groups, which has the toughness of the aromatic ring structure, the flexibility of the ether bond and the hydrophilicity of the sulfonated group. It is used in water treatment membranes and proton exchange membranes. field has been widely used. The synthesis of sulfonated polyaryl ether is divided into two processes: direct polymerization of sulfonated monomer and post-sulfonation of polyaryl ether. The main varieties are sulfonated polysulfone (SPSU), sulfonated polyethersulfone (SPES), sulfonated polyphenylene Sulfone (SPPSU), post-sulfonated polysulfone (p-SPSU), post-sulfonated polyethersulfone (p-SPES), post-sulfonated polyetheretherketone (p-SPEEK), etc. Chitosan is obtained by ...

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D69/12B01D69/02B01D67/00
CPCY02E60/50
Inventor 张中标刘晓雯边原买买冯思雯万鹏程张轶博张帅刘钰玮宋爱茹
Owner TIANJIN NORMAL UNIVERSITY
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