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High-performance forward osmosis membrane as well as preparation method and application thereof

A high-performance technology of forward osmosis membrane, applied in the field of osmosis membrane, can solve the problems of low water flux and low efficiency of heavy metal wastewater, and achieve the effect of improving water flux and promoting heavy metal ions

Active Publication Date: 2018-08-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a high-performance forward osmosis membrane and its preparation method and application, aiming at solving the problem of low water flux of the traditional forward osmosis membrane with aromatic polyamide as the skin layer and the treatment The problem of low efficiency of heavy metal wastewater

Method used

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  • High-performance forward osmosis membrane as well as preparation method and application thereof
  • High-performance forward osmosis membrane as well as preparation method and application thereof
  • High-performance forward osmosis membrane as well as preparation method and application thereof

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preparation example Construction

[0031] see figure 1 , figure 1 It is a flowchart of a preferred embodiment of a method for preparing a high-performance forward osmosis membrane of the present invention, as shown in the figure, including steps:

[0032] S10. Soak the upper surface of the basement membrane in an aqueous solution mixed with polyamide-amine dendrimers and m-phenylenediamine, take out the basement membrane after 2-5 minutes and dry the solution on the surface of the basement membrane with filter paper;

[0033] S20. Continue soaking the upper surface of the base membrane obtained in step S10 in the tris-trichloride solution, and pour off the solution after 1-3 minutes to obtain a high-performance forward osmosis membrane.

[0034] Specifically, polyamide-amine dendrimers can be used to modify the polyamide layer of the membrane due to their radial symmetry, hyperbranched structure, large number of terminal functional groups, and approximately spherical molecular structure. Through chemical modi...

Embodiment 1

[0049] A PAMAM-modified composite forward osmosis membrane (TFC-type FO membrane) was prepared by interfacial polymerization of a mixed aqueous solution of PAMAM and m-phenylenediamine (MPD) and trimesistrichloride (TMC) on a polyvinylidene fluoride-based membrane.

[0050] 1), prepare the mixed aqueous solution of the PAMAM of four kinds of different mass concentrations and MPD, the mass concentration of described PAMAM is respectively 0.1%, 0.2%, 0.3% and 0.4%, the mass concentration of described MPD is 2%;

[0051] 2), completely immerse the upper surface of the polyvinylidene fluoride-based membrane in the above-mentioned four mixed aqueous solutions of PAMAM and MPD with different mass concentrations, pour off the solution after 2 minutes, and remove the solution remaining on the surface of the base membrane with filter paper;

[0052] 3) The upper surface of the basement membrane soaked in the mixed aqueous solution of PAMAM and MPD was immersed in a n-hexane solution wit...

Embodiment 2

[0055] A PAMAM-modified TFC-type FO membrane was prepared by interfacial polymerization on a polyvinylidene fluoride-based membrane with a mass concentration of 1.0% PAMAM aqueous solution (excluding MPD) and trimesistrichloride (TMC), denoted as M-5, Its preparation steps are similar to Example 1.

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Abstract

The invention discloses a high-performance forward osmosis membrane as well as a preparation method and an application thereof. The method comprises steps as follows: the upper surface of a base membrane is soaked in a mixed water solution of PAMAM (polyamidoamine) dendrimer and MPD (m-phenylenediamine) for 2-5 min, then, the base membrane is taken out, and the solution on the surface of the basemembrane is sucked dry with filter paper; the upper surface of the base membrane is continuously soaked in a TMC (trimesoyl chloride) solution for 1-3 min, then, the solution is discarded, and the high-performance forward osmosis membrane is obtained. In the prepared high-performance forward osmosis membrane, PAMAM can increase the relative free volume and the hydrophilcity of a PA (polyamide) layer, so that the water flux of the forward osmosis membrane is improved; besides, free amido on PAMAM in the polyamide layer can adsorb heavy metal ions and increase the positive charge property of themembrane, so that the repulsive interaction on the heavy metal ions in water is enhanced, and a promoting function is produced on the forward osmosis membrane for removing the heavy metal ions in water.

Description

technical field [0001] The invention relates to the field of osmotic membranes, in particular to a high-performance forward osmosis membrane and its preparation method and application. Background technique [0002] In recent years, fresh water resources have been seriously polluted, such as water eutrophication, organic matter and heavy metal pollution, and people's health has been seriously threatened. However, heavy metal pollutants cannot be biodegraded, and can enter the human body through the food chain, damaging the central nervous system and organs of the human body. Therefore, many technologies have been applied to remove heavy metal ions in water, such as chemical precipitation, flotation, ion exchange, adsorption, membrane filtration, etc. However, each of the above techniques suffers from certain drawbacks. Chemical sedimentation and flotation are often costly, and additional costs are required to dispose of the additional sludge produced by these processes. Io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/56C02F1/44C02F1/62
CPCB01D67/0006B01D69/125B01D71/56C02F1/445C02F2101/20
Inventor 刘长坤雷晓斌
Owner SHENZHEN UNIV
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