Preparation method of hydrophobic-carbon-dot-modified forward osmosis composite membrane

A hydrophobic, forward osmosis technology, applied in the field of membrane separation, can solve the problems of difficult-to-support layer modification, poor compatibility, large filler size, etc., to alleviate the internal concentration polarization, good compatibility, water flux boosted effect

Active Publication Date: 2020-06-26
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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  • Preparation method of hydrophobic-carbon-dot-modified forward osmosis composite membrane
  • Preparation method of hydrophobic-carbon-dot-modified forward osmosis composite membrane
  • Preparation method of hydrophobic-carbon-dot-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] Among them, 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, an active layer covering the surface of the porous polymer support layer.

[0051] Among them, 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 a strong base to the aldehyde for reaction, after standing still, add inorganic acid to the reaction solution for neutralization, and solid-liquid separation to obtain hydrophobic carbon dots;

[0055] S2: Add the hydrophobic carbon dots and the film-forming agent prepared in step S1 to the organic solvent in sequence, and obtain a casting liquid after mixing;

[0056] S3: Degas and scrape the casting liquid obtained in step S2 to obtain a porous polymer support layer modified with hydrophobic carbon dots;

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

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Abstract

The invention provides a preparation method of a hydrophobic-carbon-dot-modified forward osmosis composite membrane. The hydrophobic carbon dots in a porous polymer supporting layer and a forward osmosis composite membrane are simple in preparation process and low in cost, and can be prepared in a macro-scale manner. Hydrophobic carbon dots are insoluble in water or saline water and have good compatibility with polymers and organic solvents; the adding method is simple in the preparation process of the membrane, the hydrophobic carbon dots can be easily and uniformly dispersed in a porous supporting layer and a forward osmosis composite membrane structure, and the pore channel structure of the membrane is effectively adjusted. The forward osmosis composite membrane is good in stability, the water flux is remarkably improved; meanwhile, the reverse salt flux is reduced, the salt/water selective separation effect is improved, and internal concentration polarization is relieved.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a preparation method of a forward osmosis composite membrane modified by hydrophobic carbon dots. Background technique [0002] The forward osmosis process (Forward Osmosis, referred to as FO) is driven by the osmotic pressure difference between 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 (the raw material liquid side) to the low A membrane separation process in which the water chemical potential zone (drawing liquid side) is transferred while solute molecules or ions are blocked. FO uses the 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 ra...

Claims

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Application Information

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Patent Type & Authority Applications(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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