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Preparation method of catechin-chitosan loose nanofiltration membrane based on PAN-support

A technology of chitosan and catechin, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex operation and difficult control of organic solvents, and achieve simple operation, satisfactory flux, good Effect of Inorganic Salt Permeability

Inactive Publication Date: 2018-11-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is, for traditional commercial nanofiltration membrane has very high interception rate to inorganic salt, and in preparation method, or operation is complicated, or difficult to control, or the use of a large amount of organic solvent etc., by simple deposition method, Preparation of a loose nanofiltration membrane with high permeability to inorganic salts and high rejection of dyes

Method used

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  • Preparation method of catechin-chitosan loose nanofiltration membrane based on PAN-support
  • Preparation method of catechin-chitosan loose nanofiltration membrane based on PAN-support
  • Preparation method of catechin-chitosan loose nanofiltration membrane based on PAN-support

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Experimental program
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Effect test

Embodiment 1

[0027] In the first step, 1wt.% chitosan was dissolved in 2wt.% acetic acid aqueous solution, stirred for one hour to make it uniformly dispersed in aqueous solution, and then adding initiator (0.02wt.% vitamin C and 0.015wt.% super Hydrogen peroxide) and catechin are completely dissolved at 25°C, and the pH value of the solution is adjusted to 4, and the dissolved system is reacted at 25°C for 18 hours to obtain a light yellow deposition liquid, the catechin described in this implementation method The mass fraction of acid is 0.07%.

[0028] In the second step, the purchased PAN ultrafiltration membrane (with an area of ​​0.3m 2 ) was hydrolyzed in 8wt.% NaOH solution at 65°C for one hour, then taken out, soaked in pure water for 24 hours to obtain the hydrolyzed PAN substrate.

[0029] The third step is to immerse the hydrolyzed PAN substrate in the deposition solution obtained in the first step for 4 hours, then take it out, put it in an oven at 45°C for one hour, take it ...

Embodiment 2

[0031] In the first step, 1wt.% chitosan was dissolved in 2wt.% acetic acid aqueous solution, stirred for one hour to make it uniformly dispersed in aqueous solution, and then adding initiator (0.02wt.% vitamin C and 0.015wt.% super Hydrogen peroxide) and catechin are completely dissolved at 25°C, and the pH value of the solution is adjusted to 4, and the dissolved system is reacted at 25°C for 18 hours to obtain a light yellow deposition liquid, the catechin described in this implementation method The mass fraction of acid is 0.08%.

[0032] In the second step, the purchased PAN ultrafiltration membrane (with an area of ​​0.3m 2 ) was hydrolyzed in 8wt.% NaOH solution at 65°C for one hour, then taken out, soaked in pure water for 24 hours to obtain the hydrolyzed PAN substrate.

[0033] The third step is to immerse the hydrolyzed PAN substrate in the deposition solution obtained in the first step for 4 hours, then take it out, put it in an oven at 45°C for one hour, take it ...

Embodiment 3

[0035] In the first step, 1wt.% chitosan was dissolved in 2wt.% acetic acid aqueous solution, stirred for one hour to make it uniformly dispersed in aqueous solution, and then adding initiator (0.02wt.% vitamin C and 0.015wt.% super Hydrogen peroxide) and catechin are completely dissolved at 25°C, and the pH value of the solution is adjusted to 4, and the dissolved system is reacted at 25°C for 18 hours to obtain a light yellow deposition liquid, the catechin described in this implementation method The mass fraction of acid is 0.09%.

[0036] In the second step, the purchased PAN ultrafiltration membrane (with an area of ​​0.3m 2 ) was hydrolyzed in 8wt.% NaOH solution at 65°C for one hour, then taken out, soaked in pure water for 24 hours to obtain the hydrolyzed PAN substrate.

[0037] The third step is to immerse the hydrolyzed PAN substrate in the deposition solution obtained in the first step for 4 hours, then take it out, put it in an oven at 45°C for one hour, take it ...

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Abstract

A preparation method of a catechin-chitosan loose nanofiltration membrane based on PAN-support, belongs to the technical field of a membrane. The invention allows two water-soluble natural substancesincluding catechin and chitosan to be blended at a certain ratio, and uses vitamin C and hydrogen peroxide as initiators, to adjust the pH value of the reaction, and to deposit chitosan modified by catechin on a PAN substrate. The obtained composite nanofiltration membrane has a relatively loose separation layer. The permeability of NaCl and Na2SO4 is 87.5% and 95.2% respectively, the rejection rate of the dyes including Congo red, magenta and crystal violet is 99. 6%, 98.7% and 98.5% respectively, and the permeate flux reaches 72L m<-2>h<-1>MPa<-1>.

Description

technical field [0001] The invention relates to a preparation method of a loose nanofiltration membrane, in particular to the preparation of a nanofiltration membrane on a PAN ultrafiltration membrane with catechin modified chitosan, which belongs to the technical field of membranes. technical background [0002] Water-soluble dyes, including acid dyes, reactive dyes and direct dyes, are widely used in the textile printing and dyeing industry due to their better coloring properties. In China, up to 1×10 types of dyes are used in this industry every year 5 , the annual output of printing and dyeing cloth reaches 4×10 10 m, more than 30% of the world's total. However, during the dyeing process, a large amount of high salinity (NaCl and Na 2 SO 4 ), high chroma (tens of thousands to hundreds of thousands), and high CODCr (tens of thousands to hundreds of thousands) of wastewater. The direct discharge of dye wastewater has caused serious pollution to the environment, threat...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D71/08C02F1/44
CPCB01D61/027B01D67/0002B01D71/08C02F1/442C02F2101/308
Inventor 王湛尤琪刘松柏
Owner BEIJING UNIV OF TECH
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