Preparation method of supportless forward osmosis membrane

A forward osmosis membrane, unsupported technology, applied in the field of environmental engineering, can solve the problems of shackled forward osmosis membrane separation technology, etc., to solve the problem of internal concentration polarization, improve the retention rate, and improve the effect of energy utilization.

Inactive Publication Date: 2015-02-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the traditional membrane production mode of support layer plus active layer is still used, internal concentration polarization in the support layer is inevitable, and the bottleneck problem that hampers the wider application of forward osmosis membrane separation technology has not been resolved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1. Prepare and prepare concentration respectively the aqueous solution of polyvinyl alcohol of 2.5%, the aqueous solution of m-phenylenediamine of 1%, the aqueous solution of trimesoyl chloride n-hexane of 0.5% and the graphene oxide aqueous solution of 3.2mg / mL;

[0019] Step 2. Take 28 ml of polyvinyl alcohol aqueous solution, 7 ml of m-phenylenediamine aqueous solution and 7 ml of graphene oxide aqueous solution, mix them evenly, pour them into a film-making container, and place the container in a constant temperature water bath at 60°C. When the solution is completely dried, a black film can be peeled off from the bottom of the container;

[0020] Step 3. Immerse the stripped film in trimesoyl chloride n-hexane solution for 180 seconds, take it out and dry it at room temperature for 24 hours to prepare an unsupported forward osmosis membrane.

[0021] The test results of the forward osmosis membrane show that the water flux is 3.5LMH and the salt flux is 9.8gMH...

Embodiment 2

[0023] Step 1. Prepare and prepare concentration respectively the aqueous solution of polyvinyl alcohol of 2.5%, the aqueous solution of m-phenylenediamine of 1%, the aqueous solution of trimesoyl chloride n-hexane of 0.5% and the graphene oxide aqueous solution of 3.2mg / mL;

[0024] Step 2. Take 28 ml of polyvinyl alcohol aqueous solution, 14 ml of m-phenylenediamine aqueous solution and 7 ml of graphene oxide aqueous solution, mix them evenly, pour them into a film-making container, and place the container in a constant temperature water bath at 60°C. When the solution is completely dried, a black film can be peeled off from the bottom of the container;

[0025] Step 3. Immerse the stripped film in trimesoyl chloride n-hexane solution for 180 seconds, take it out and dry it at room temperature for 24 hours to prepare an unsupported forward osmosis membrane.

[0026] The test results of the forward osmosis membrane show that the water flux is 3.4LMH and the salt flux is 14.5g...

Embodiment 3

[0028] Step 1. Prepare and prepare concentration respectively the aqueous solution of polyvinyl alcohol of 2.5%, the aqueous solution of m-phenylenediamine of 1%, the aqueous solution of trimesoyl chloride n-hexane of 0.5% and the graphene oxide aqueous solution of 3.2mg / mL;

[0029] Step 2. Take 28 ml of polyvinyl alcohol aqueous solution, 21 ml of m-phenylenediamine aqueous solution and 7 ml of graphene oxide aqueous solution, mix them evenly, pour them into a film-making container, and place the container in a constant temperature water bath at 60°C. When the solution is completely dried, a black film can be peeled off from the bottom of the container;

[0030] Step 3. Immerse the stripped film in trimesoyl chloride n-hexane solution for 180 seconds, take it out and dry it at room temperature for 24 hours to prepare an unsupported forward osmosis membrane.

[0031] Forward osmosis membrane test results are water flux 3.1LMH, salt flux 12.8gMH

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Abstract

Belonging to the field of environmental engineering, the invention relates to a preparation method of a supportless forward osmosis membrane. The method disclosed in the invention utilizes the high hydrophilicity and film-forming property of polyvinyl alcohol, brings the polyvinyl alcohol into crosslinking with graphene oxide with bactericidal property and flexibility, and adds m-phenylenediamine and trimesoyl chloride to reduce the salt reverse flux of the prepared forward osmosis membrane. The forward osmosis membrane prepared by the method provided in the invention has thickness less than 38 micrometers, and has the characteristics of no support, high hydrophilicity and pollution resistance, well solves the problems of internal concentration polarization and membrane fouling, thus opening up a new way for forward osmosis membrane preparation and being able to promote wider application of a forward osmosis membrane separation technology.

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to a preparation method of an unsupported forward osmosis membrane. Background technique [0002] The shortage of water resources has risen to a global crisis, and it is also an important constraint on the sustainable development of my country's society and economy. Direct reuse of sewage as drinking water is one of the important ways to solve the problem of water shortage. Membrane separation technology operates at room temperature, has no phase change, and has low energy consumption. It is one of the most promising technologies for regenerating drinking water. [0003] Forward osmosis (FO) is a membrane separation process driven only by osmotic pressure. Water molecules spontaneously permeate through a semipermeable membrane from the raw material part with high water chemical potential to the draw liquid part with low water chemical potential. The direct extraction of drinki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/02
Inventor 张捍民李海军杨凤林
Owner DALIAN UNIV OF TECH
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