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Preparation method of polyacrylonitrile-based composite loose nanofiltration membrane

A polyacrylonitrile-based membrane, polyacrylonitrile-based technology, applied in the field of membrane separation, can solve the problems of low permeation flux, poor hydrophilicity, instability, etc., and achieve good anti-pollution performance, low cost and high stability. Effect

Inactive Publication Date: 2020-07-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at problems such as low permeation flux, poor hydrophilicity, or instability, or serious pollution in existing nanofiltration membranes, the present invention uses a simple process to prepare a composite loose nanofiltration membrane with good retention rate and high permeation flux. membrane

Method used

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  • Preparation method of polyacrylonitrile-based composite loose nanofiltration membrane
  • Preparation method of polyacrylonitrile-based composite loose nanofiltration membrane
  • Preparation method of polyacrylonitrile-based composite loose nanofiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In the first step, the polyacrylonitrile (PAN) ultrafiltration membrane is immersed in 2mol / L NaOH aqueous solution for hydrolysis modification, the hydrolysis temperature is 45±1°C, and the hydrolysis time is 30-40min. After the hydrolysis is completed, rinse with deionized water several times to remove the residual alkali on the surface of the membrane until the rinse water is neutral, that is, the basement membrane (HPAN) with carboxyl groups distributed on the surface is obtained;

[0030] In the second step, immerse the base film of step (1) in a 3wt% polyethyleneimine (PEI) aqueous solution, put it in a vacuum oven at 45±1°C for 30-40min, take it out, and rinse it with deionized water for 3 After removing the unreacted PEI for the first time, put it into a vacuum oven and dry it to obtain a composite film (PEI / HPAN) coated with a polymer;

[0031] In the third step, the PEI / HPAN membrane was soaked in 0.3wt% phytate (IP6) aqueous solution for 3 minutes, and then p...

Embodiment 2

[0034] The concentration of polyethyleneimine (PEI) in Step 2 in Example 1 was adjusted to 1 wt%, and the rest of the conditions were the same as in Example 1. The prepared composite loose nanofiltration membrane has a rejection rate of 91.29% and a permeation flux of 15.59L / m at 20±1°C, 0.2MPa of 100mg / L crystal violet aqueous solution 2 h.

Embodiment 3

[0036] The concentration of polyethyleneimine (PEI) in Step 2 in Example 1 was adjusted to 2 wt%, and the rest of the conditions were the same as in Example 1. The prepared composite loose nanofiltration membrane has a rejection rate of 94.44% and a permeation flux of 10.91L / m at 20±1°C, 0.2MPa of 100mg / L crystal violet aqueous solution 2 h.

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Abstract

The invention discloses a preparation method of a polyacrylonitrile-based composite loose nanofiltration membrane, and belongs to the technical field of membranes. The method specifically comprises the following steps: immersing a polyacrylonitrile ultrafiltration membrane in a sodium hydroxide aqueous solution for hydrolysis modification, washing with deionized water after hydrolysis is completed, and soaking to remove residual alkalis on the surface of the membrane; immersing the hydrolyzed base membrane in a polyethyleneimine aqueous solution with a certain concentration to obtain a composite membrane of which the surface is coated with a polymer; putting the coated membrane into an inositol hexaphosphate aqueous solution with a certain concentration for phosphorylation modification; putting the modified membrane into a ferric chloride aqueous solution for crosslinking, and then taking out and drying the membrane to obtain the polyacrylonitrile-based composite loose nanofiltration membrane. The composite membrane prepared by the invention has higher permeation flux and rejection rate, and has higher application value in the aspect of loose nanofiltration membrane preparation.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a method for preparing a composite loose nanofiltration membrane using polyacrylonitrile as a base membrane. [0002] technical background [0003] With the development of urbanization and industrialization, water pollution and resource shortage have become problems that need to be solved urgently. In particular, printing and dyeing wastewater contains a relatively high concentration of dye molecules, inorganic salts and additives, with high chroma and high biological toxicity. If it is discharged directly, it will cause serious damage to the ecological environment. At the same time, the molecular chemical structure of the dye is stable and the biodegradability is poor. Traditional water treatment methods such as adsorption, oxidation, flocculation or precipitation will use a large amount of chemical reagents and the quality of the effluent is poor and the efficiency is low. Th...

Claims

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Application Information

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IPC IPC(8): B01D71/60B01D69/12B01D69/02B01D67/00B01D61/00C02F1/44
CPCB01D61/027B01D67/0079B01D69/02B01D69/125B01D71/60C02F1/442Y02A20/131
Inventor 王湛王建涛李平郭洋洋尹霜
Owner BEIJING UNIV OF TECH
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