High-flux nano composite membrane and preparation method thereof
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A nano-composite, high-throughput technology, applied in the field of membrane separation, can solve the problems of low flux of nanofiltration/reverse osmosis membranes, unsuitable for industrial production, weak binding force, etc. Effects of film-making time, compatibility, and binding enhancement
Pending Publication Date: 2021-04-27
OCEAN UNIV OF CHINA
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Problems solved by technology
[0007] The present invention aims at a series of technical problems in the prior art, such as the low flux of the nanofiltration / reverse osmosis membrane, the weak binding force between the nanomaterial and the base membrane in the doped nanomaterial composite membrane, which is easy to fall off and is not suitable for industrial production, and proposes a series of technical problems. A method for preparing a high-throughput nanocomposite membrane using an ultrathin hydrophilic mixed matrix layer formed by co-deposition of two-dimensional nanomaterials and polyvinyl alcohol (PVA) as a modified layer. The prepared nanocomposite membrane has an ultrathin skin layer and very good separation properties
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Embodiment 1
[0051] The film making steps are as follows:
[0052] (1) Prepare a mixed solution with a PVA mass concentration of 1% and a GO concentration of 10 mg / L, and ultrasonicate for 60 minutes to obtain a mixed solution of PVA / PVA modified two-dimensional nanomaterials uniformly dispersed in two-dimensional nanomaterials;
[0053] (2) Soak the base film in the mixture of PVA / PVA modified two-dimensional nanomaterials for 3 minutes, then take the base film out of the solution and dry it in the air;
[0054] (3) Soak the dried basement membrane in a glutaraldehyde solution with a mass concentration of 1% for 2 minutes, pour off the excess crosslinking agent solution on the membrane surface, and dry the membrane to form a two-dimensional nanomaterial and PVA co-deposited ultra-thin hydrophilic mixed matrix modification layer;
[0055] (4) On the base film of the ultra-thin hydrophilic mixed matrix modification layer formed by the co-deposition of two-dimensional nanomaterials and PVA,...
Embodiment 2
[0058] The difference from Example 1 is that the mass concentration of PVA in step (1) becomes 0.1%.
[0059] All other steps are identical with embodiment 1; Test condition is identical with comparative example.
[0060] The prepared polypiperazine amide composite nanofiltration membrane is effective for Na 2 SO 4 The rejection rate is 98.9%, and the flux is 128.8 L / (m 2 h), compared with the comparative example, the flux and retention rate have been greatly improved.
Embodiment 3
[0062] The difference from Example 1 is that the concentration of PVA in step (1) is 2%.
[0063] All other steps are identical with embodiment 1; Test condition is identical with comparative example.
[0064] The prepared polypiperazine amide composite nanofiltration membrane is effective for Na 2 SO 4 The rejection rate is 98.8%, and the flux is 113.8 L / (m 2 h), compared with the comparative example, the flux and retention rate have been greatly improved.
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Abstract
The invention relates to a preparation method of a nano composite membrane taking polyvinyl alcohol (PVA) doped with a two-dimensional nano material as a modification layer, and belongs to the technical field of membrane preparation. An ultrafiltration membrane or a microfiltration membrane is used as a base membrane, PVA doped with a two-dimensional nano-material is used for modifying the base membrane, the binding force of the two-dimensional nano material and the base membrane is improved by utilizing the binding performance of PVA, the problem that the nano-material in the composite membrane doped with the nano material is easy to fall off is solved, and a cross-linking agent is used for cross-linking; the stability of the nano material is further enhanced, PVA is prevented from swelling and dissolving, then interfacial polymerization is carried out on the modified base membrane, and the compact and ultrathin separation layer is prepared. The modification layer prepared on the surface of the base membrane regulates the surface appearance of the base membrane, better regulates the interfacial polymerization reaction process and the skin layer structure of the membrane, and greatly improves the rejection rate and flux of the composite membrane.
Description
technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a high-throughput nanometer membrane with an ultra-thin hydrophilic mixed matrix layer basement membrane modification layer co-deposited with two-dimensional nanomaterials and polyvinyl alcohol (PVA) and prepared by interfacial polymerization. Composite membrane and method for its preparation. Background technique [0002] Water resources are the resources that all life on earth depends on for survival. However, due to the pollution of water resources caused by the surge of population, accelerated urbanization and industrialization, the world is facing a crisis of shortage of fresh water resources. According to the World Health Organization, by 2025, nearly half of the world's people will live in water-scarce areas. Although more than 70% of the earth is covered by water, only 3% of the water resources are fresh water resources that can be directly used by...
Claims
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