Forward osmosis basement membrane for optimizing surface charges on side of draw solution and preparation method of forward osmosis basement membrane

A technology of side surface and liquid extraction, applied in the field of membrane separation, can solve the problem of lack of forward osmosis base membrane modification method, etc.

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the prior art still lacks a method for modifying forward osmosis basement membranes by controlling surface charge optimization and improving forward osmosis separation performance.

Method used

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  • Forward osmosis basement membrane for optimizing surface charges on side of draw solution and preparation method of forward osmosis basement membrane
  • Forward osmosis basement membrane for optimizing surface charges on side of draw solution and preparation method of forward osmosis basement membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Alkali treatment: cut the polyacrylonitrile film into a sheet of 6×8 cm, immerse it in sodium hydroxide solution for 1 hour, the concentration of the alkali solution is 1.5mol / L, and the alkali treatment temperature is 45°C After taking out the membrane, rinse it with deionized water three times, and then soak it in deionized water.

[0028] (2) Aperture modification treatment: immerse the membrane after the alkali treatment in 300ml m-phenylenediamine aqueous solution for 5 minutes, the concentration of m-phenylenediamine is 2wt%, then take out the polyacrylonitrile membrane, and roll out the residual surface with a rubber rod m-phenylenediamine aqueous solution, and then soak the surface in the n-hexane solution of trimesoyl chloride, interfacial polymerization reaction for 1 minute, then take out the polyacrylonitrile film, rinse it three times with n-hexane, and store it in deionized water until The concentration of the n-hexane solution of trimesoyl chloride is...

Embodiment 2

[0031] The difference between the present invention and Example 1 is that negative electricity modification is carried out, which is specifically described as follows.

[0032] (4) Negative modification treatment. Spread the side positively modified in step (3) in 2wt% phytic acid aqueous solution, react for 20 minutes, then take it out and rinse it three times with deionized water to obtain a polyacrylonitrile membrane with a negatively charged surface. Then store in deionized water until use.

Embodiment 3

[0034] The present invention differs from Example 2 in that the organic molecule is aminotrimethylenephosphonic acid.

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Abstract

The invention belongs to the field of membrane separation, and particularly relates to a forward osmosis basement membrane for optimizing surface charges on the side of a draw solution and a preparation method of the forward osmosis basement membrane. The preparation method comprises the following steps: immersing a membrane into a modified monomer solution containing a positively charged group, taking out the membrane, spreading the membrane on the surface of a cross-linked monomer solution, and carrying out a polymerization reaction to generate a cross-linked polymer, so as to obtain the membrane with the positively charged surface. Charge repulsion is generated on specific solute ions by changing charge properties and charge intensity on the surface of the membrane, and specific draw solution solute is limited to penetrate through the membrane to enter feed liquid, so that reverse salt flux is reduced, forward osmosis separation performance is improved, and forward osmosis membrane surface charge optimization is realized to regulate and control forward osmosis performance.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a forward osmosis base membrane with optimized surface charge on the draw liquid side and a preparation method thereof. Background technique [0002] Forward osmosis (FO), as a low-energy, high-efficiency and sustainable membrane separation technology, has received more and more attention in recent decades, and has great potential in the fields of seawater desalination, wastewater treatment and food processing. Strong application prospects. In the actual FO process, the draw solution will pass through the membrane and enter the feed solution, resulting in a reverse solute flux, which reduces the concentration difference of the solution on both sides of the membrane, thereby reducing the driving force of the forward osmosis process and further allowing the water to pass through. The amount decreases, reducing the FO separation performance. On the other hand, due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/00
CPCB01D67/0006B01D67/0093B01D69/02B01D61/002B01D2325/16B01D2325/14
Inventor 王艳朱林伟
Owner HUAZHONG UNIV OF SCI & TECH
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