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Preparation method of high-water-flux high-toughness nanofiltration membrane

A high-toughness, nanofiltration membrane technology, applied in the field of separation membranes, can solve problems such as insufficient water flux, low water flux, and insufficient hydrophilicity of nanofiltration membranes.

Pending Publication Date: 2020-08-25
泉州市奥谷杰环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a preparation of a high water flux and high toughness nanofiltration membrane for the defects of insufficient hydrophilicity, low water flux, and insufficient mechanical strength and toughness of the current nanofiltration membrane. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of enzymatic hydrolyzate:

[0031] Throw graphite flakes and sulfuric acid solution with a mass fraction of 80% into a beaker at a mass ratio of 1:10, place the beaker in a water bath with a water bath temperature of 0°C, and stir with a stirrer at a speed of 120r / min for 40min. Reaction slurry, adding potassium ferrate powder with a mass of 1.0% of the reaction slurry to the reaction slurry, raising the temperature of the water bath to 20°C, stirring and mixing for 30 minutes to obtain an oxidation reaction solution;

[0032] Put the above oxidation reaction solution into a suction filter to obtain filter residue, wash the filter residue 3 times with distilled water to obtain an oxidation product, put the oxidation product and cotton into a pulverizer at a mass ratio of 5:1 and mix them to obtain a mixture. The mixture and cellulase are put into the enzymolysis tank at a mass ratio of 200:1, and the enzymolysis tank is placed in a greenhouse at an indoor te...

Embodiment 2

[0040] Preparation of enzymatic hydrolyzate:

[0041] Put flake graphite and sulfuric acid solution with a mass fraction of 85% into a beaker at a mass ratio of 1:10, place the beaker in a water bath with a water bath temperature of 2°C, and stir with a stirrer at a speed of 140r / min for 50min. Reaction slurry, adding potassium ferrate powder with a mass of 1.2% of the reaction slurry to the reaction slurry, raising the temperature of the water bath to 25°C, stirring and mixing for 35 minutes to obtain an oxidation reaction solution;

[0042] Put the above oxidation reaction solution into a suction filter and filter to obtain the filter residue, wash the filter residue with distilled water 4 times to obtain the oxidation product, put the oxidation product and cotton into the pulverizer at a mass ratio of 5:1 and mix them to obtain a mixture. The mixture and cellulase are put into the enzymolysis tank at a mass ratio of 200:1, and the enzymolysis tank is placed in a greenhouse ...

Embodiment 3

[0050] Preparation of enzymatic hydrolyzate:

[0051] Put flake graphite and sulfuric acid solution with a mass fraction of 90% into a beaker at a mass ratio of 1:10, place the beaker in a water bath with a water bath temperature of 5°C, and stir with a stirrer at a speed of 150r / min for 60min. Reaction slurry, adding potassium ferrate powder with a mass of 1.5% of the reaction slurry to the reaction slurry, raising the temperature of the water bath to 30°C, stirring and mixing for 40 minutes to obtain an oxidation reaction solution;

[0052] Put the above oxidation reaction solution into a suction filter and filter to obtain the filter residue, wash the filter residue with distilled water for 5 times to obtain the oxidation product, put the oxidation product and cotton into the pulverizer at a mass ratio of 5:1 and mix them to obtain a mixture. The mixture and cellulase are put into the enzymolysis tank at a mass ratio of 200:1, and the enzymolysis tank is placed in a greenho...

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Abstract

The invention discloses a preparation method of a high-water-flux high-toughness nanofiltration membrane, and belongs to the technical field of separation membranes. The method comprises the followingsteps: adding graphite into sulfuric acid and mixing; after mixing, adding potassium ferrate and stirring to obtain an oxidation reaction solution; carrying out suction filtration on the oxidation reaction liquid to obtain filter residues; mixing and crushing the filter residues and cotton; crushing, mixing with cellulase, and carrying out enzymolysis treatment to obtain an enzymolysis product; mixing and heating the enzymolysis product and distilled water; dropwise adding alkali liquor and stirring to obtain an alkaline mixed solution; adding iodine into the alkaline mixed solution; adding sodium sulfite and stirring to obtain a reaction mixed solution; dropwise adding hydrochloric acid into the reaction mixed solution, and performing vacuum drying and high-temperature treatment to obtain a fiber toughening agent; finally mixing the fiber toughening agent, an ethanol solution and methylbenzene to obtain a prefabricated solution, soaking a membrane into the prefabricated solution, drying and washing after soaking to obtain the high-water-flux high-toughness nanofiltration membrane. The nanofiltration membrane has improved mechanical strength and toughness.

Description

technical field [0001] The invention discloses a preparation method of a nanofiltration membrane with high water flux and high toughness, and belongs to the technical field of separation membranes. Background technique [0002] Nanofiltration membrane: The pore size is above 1nm, generally 1-2nm. It is a functional semi-permeable membrane that allows solvent molecules or some low-molecular-weight solutes or low-priced ions to pass through. It is a special and promising type of separation membrane, which is named after the size of the intercepted material is about nanometers. It is used to remove organic matter and color of surface water, remove hardness of ground water, partially remove soluble salt, concentrate fruit juice and separate useful substances in medicine, etc. [0003] Nanofiltration membrane is a new type of separation membrane that came out in the late 1980s. Its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/26
CPCB01D67/0079B01D69/02B01D71/26
Inventor 雷洪艳
Owner 泉州市奥谷杰环保材料科技有限公司
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