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A kind of preparation method of hydrophobic carbon point modified forward osmosis composite membrane

A hydrophobic, forward osmosis technology, applied in the field of membrane separation, can solve the problems of poor compatibility, large filler size, difficult to support layer modification, etc., achieve good compatibility, improve water flux, and alleviate the extreme concentration difference the effect of

Active Publication Date: 2020-09-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned prior art, due to the large size of the filler, the compatibility between the polymer matrix and fillers such as graphene oxide, nano-zinc oxide, and nano-titanium dioxide is poor, and it is difficult to effectively modify the support layer.

Method used

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  • A kind of preparation method of hydrophobic carbon point modified forward osmosis composite membrane
  • A kind of preparation method of hydrophobic carbon point modified forward osmosis composite membrane
  • A kind of preparation method of hydrophobic carbon point modified forward osmosis composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This example provides a porous polymer support layer modified with hydrophobic carbon dots, and hydrophobic carbon dots are distributed in the porous polymer support layer modified with hydrophobic carbon dots.

[0047] Wherein, the content of hydrophobic carbon dots is 5-15 wt%. The particle size of the hydrophobic carbon dots is 1-100 nm, preferably 2-5 nm.

Embodiment 2

[0049] This example provides a forward osmosis composite membrane, including:

[0050] The hydrophobic carbon dot modified porous polymer support layer of Example 1; and the active layer covering the surface of the porous polymer support layer.

[0051] Wherein, the porosity of the forward osmosis composite membrane is 50-80%.

Embodiment 3

[0053] This example provides a method for preparing a forward osmosis composite membrane, including the following steps:

[0054] S1: Add strong base to aldehyde for reaction, after standing still, add inorganic acid to the reaction solution for neutralization, solid-liquid separation to obtain hydrophobic carbon dots;

[0055] S2: adding the hydrophobic carbon dots and film-forming agent prepared in step S1 into the organic solvent in sequence, and mixing to obtain the casting solution;

[0056] S3: defoaming and scraping the casting solution obtained in step S2 to obtain a porous polymer support layer modified by hydrophobic carbon dots;

[0057] S4: Put the porous polymer support layer modified by hydrophobic carbon dots obtained in step S3 into a coagulation bath, remove the aqueous solution on the surface of the support layer with a scraper after taking it out, and remove the porous polymer support layer modified by hydrophobic carbon dots One of the surfaces was contact...

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Abstract

The invention provides a method for preparing a hydrophobic carbon point modified forward osmosis composite membrane. The porous polymer support layer and the hydrophobic carbon dots in the forward osmosis composite membrane of the present invention have simple preparation process, low cost and can be prepared in a large scale. Hydrophobic carbon dots are insoluble in water or brine, and have good compatibility with polymers and organic solvents. The addition method is simple in the membrane preparation process, and can be easily and uniformly dispersed in the porous support layer and forward osmosis composite membrane structure, effectively regulating the membrane. the pore structure. The forward osmosis composite membrane of the present invention has good stability, and the water flux is significantly improved, while the reverse salt flux is reduced, the separation effect of salt / water selectivity is improved, and the internal concentration polarization is alleviated.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a hydrophobic carbon point modified forward osmosis composite membrane. Background technique [0002] The forward osmosis process (Forward Osmosis, referred to as FO) is driven by the osmotic pressure difference on both sides of the selective separation membrane. The water molecules in the solution pass through the selective separation membrane from the high water chemical potential area (raw material side) to the low A membrane separation process in which the water chemical potential area (draw liquid side) is passed, but solute molecules or ions are blocked. FO uses transmembrane osmotic pressure difference instead of external pressure (such as reverse osmosis membrane process) as the driving force to make water pass through the separation membrane, which will eventually lead to the concentration of the feed solution and the dilut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D61/00B01D69/10
CPCB01D61/002B01D67/0013B01D67/0016B01D67/0093B01D69/10B01D69/105B01D69/12B01D2323/04B01D2323/12B01D2325/38
Inventor 胡久刚张宗菊侯红帅刘士军纪效波
Owner CENT SOUTH UNIV
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