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Separation membrane and preparation method thereof, membrane separation equipment and sewage treatment method

A technology for separating membranes and ions, applied in the field of membrane separation, can solve the problems of low water flux, reduced selectivity, hindering the application and promotion of natural polymer separation membranes, etc.

Pending Publication Date: 2021-08-27
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the separation performance of natural polymer separation membranes is usually difficult to match that of traditional chemical polymer separation membranes, mainly due to their low water flux, while increasing water flux usually leads to a decrease in selectivity, and it is difficult to take care of both. , which seriously hinders the application and popularization of natural polymer separation membranes

Method used

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  • Separation membrane and preparation method thereof, membrane separation equipment and sewage treatment method
  • Separation membrane and preparation method thereof, membrane separation equipment and sewage treatment method
  • Separation membrane and preparation method thereof, membrane separation equipment and sewage treatment method

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preparation example Construction

[0063] The raw materials for the preparation of layered double metal hydroxide nanoparticles can be commonly used raw materials in this field, such as using Mg, Cu, Co, Zn, Ni, etc. as divalent metal ions, and using Al, Ti, Fe, Sc, Cr, etc. as Trivalent metal ions, with a variety of inorganic, organic or complex anions as intercalation anions (including carbonate, nitrate, sulfate, phosphate, chloride, stearate, dodecylsulfonate, fatty acid, etc. ). Different elements can be selected as raw materials for forming hydrotalcite nanoparticles.

[0064] Specifically, the layered double metal hydroxide nanoparticles are selected from at least one of hydrotalcite nanoparticles and hydrotalcite-like nanoparticles. In one embodiment, the layered double hydroxide nanoparticles are hydrotalcite nanoparticles.

[0065] In one embodiment, the elements of the hydrotalcite nanoparticles include hydroxides of divalent Mg and trivalent Al, with carbonate as an anion. The interlayer spacing ...

Embodiment 1

[0114] This embodiment provides a separation membrane with nanoparticles doped with natural polymers. The raw materials for the preparation of the separation membrane include: hydrotalcite nanoparticles and chitosan. The particle diameter of the hydrotalcite nanoparticle is 200nm, the hydrotalcite nanoparticle has a multilayer structure, and the mass of the hydrotalcite nanoparticle is 2% of the chitosan mass. The hydrotalcite nanoparticles in this example use magnesium ions as divalent metal ions, aluminum ions as trivalent metal ions, and carbonate ions as anions, which can be prepared by the preparation method in Example 10. The schematic diagram of the structure of the hydrotalcite nanoparticles of the present embodiment is as figure 2 shown.

[0115] This embodiment also provides a method for preparing a separation membrane, the specific steps are as follows:

[0116] Urea, potassium hydroxide and lithium hydroxide monohydrate (LiOH·H 2 O) Dissolve in ultrapure water ...

Embodiment 2

[0118] This embodiment provides a nanoparticle-doped natural polymer separation membrane, and the preparation raw materials of the separation membrane include: hydrotalcite nanoparticles and chitosan. The particle diameter of the hydrotalcite nanoparticle is 200nm, the hydrotalcite nanoparticle has a multilayer structure, and the mass of the hydrotalcite nanoparticle is 0.5% of the chitosan mass. The hydrotalcite nanoparticles in this example use magnesium ions as divalent metal ions, aluminum ions as trivalent metal ions, and carbonate ions as anions, which can be prepared by the preparation method in Example 10.

[0119] This embodiment also provides a method for preparing a separation membrane, the specific steps are as follows:

[0120] Urea, potassium hydroxide and lithium hydroxide monohydrate (LiOH·H 2 O) Dissolve in ultrapure water and stir on a magnetic stirrer until completely dissolved to obtain a solution. In the solution, the mass percentages of urea, potassium ...

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Abstract

The invention relates to a separation membrane and a preparation method thereof, membrane separation equipment and a sewage treatment method. The separation membrane comprises a natural polymer and layered double-metal hydroxide nanoparticles doped in the natural polymer, the natural polymer is selected from one of chitosan, chitin and cellulose, and the mass of the layered double-metal hydroxide nanoparticles is 0.5-3% of the mass of the natural polymer. Layered double metal hydroxide nanoparticles are doped in a natural polymer, and the hydrophilicity and internal water channels of the layered double metal hydroxide nanoparticles and the influence on the separation membrane forming process and the secondary structure are utilized, so that the separation performance of the separation membrane prepared from the natural polymer as a raw material is improved; therefore, the separation membrane with an excellent separation effect on various pollutants is obtained.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a separation membrane, a preparation method thereof, membrane separation equipment and a sewage treatment method. Background technique [0002] Membrane separation technology is an emerging separation technology that uses a selective semi-permeable membrane (separation membrane) as the core to separate, concentrate or purify multi-component mixtures. Because membrane technology has the characteristics of high separation efficiency, easy operation, short treatment process and easy industrial scale-up, it has been widely used in many fields such as chemical industry, environmental protection, biomedicine, food and beverage, and energy batteries, thus creating a huge society. The value and economic benefits have made important contributions to the progress of science and technology and the improvement of people's living standards. At present, the raw materials of commercial separ...

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D71/10B01D67/00C02F1/44C02F101/30C02F101/32
CPCB01D71/08B01D71/10B01D67/0079C02F1/44B01D2325/24B01D2325/36C02F2101/30C02F2101/308C02F2101/32
Inventor 刘鑫李炜怡索红日石述宇王栋李卓刘崇炫
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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