Method for preparing two-dimensional montmorillonite/cellulose composite filter membrane

A cellulose filter membrane and composite filtration technology is applied in the field of preparing two-dimensional montmorillonite/cellulose composite filter membrane, which can solve the influence of filtrate components, weaken the adsorption performance of the composite porous adsorption membrane, and cannot effectively remove heavy metal ions and dyes and other problems, to achieve the effect of easy industrial production and simple preparation method

Active Publication Date: 2019-02-01
TONGJI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, microfiltration membranes also have certain shortcomings: they cannot effectively remove pollutants such as heavy metal ions and dyes that may pose a threat to people's health in water.
The layered silicate powder used in this patent will permeate into the filtrate during use, thereby affecting the composition of the filtrate; the gradual loss of the silicate powder will also lead to a weakening of the adsorption performance of the composite porous adsorption membrane

Method used

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  • Method for preparing two-dimensional montmorillonite/cellulose composite filter membrane
  • Method for preparing two-dimensional montmorillonite/cellulose composite filter membrane
  • Method for preparing two-dimensional montmorillonite/cellulose composite filter membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Using solid montmorillonite and pure water as a solvent, a two-dimensional montmorillonite solution with a solid-to-liquid ratio of 10 g / L was prepared, and ultrasonicated in a 90W probe ultrasonic breaker for 10 minutes with an ultrasonic interval of 5 seconds and 5 seconds. The montmorillonite solution after ultrasonication was centrifuged at 8000 rpm for 5 minutes, and the supernatant was taken to obtain a two-dimensional montmorillonite solution with a concentration of 3.35 mg / ml.

[0048] Place the mixed cellulose filter membrane with a pore size of 0.22 microns on the vacuum filter bottle, add 3 ml of two-dimensional montmorillonite solution to the Buchner funnel, turn on the circulating water vacuum pump, and filter out the two-dimensional montmorillonite solution. Water makes the two-dimensional montmorillonite tightly stacked on the surface of the cellulose microporous membrane. After air-drying at room temperature, a two-dimensional montmorillonite / cellulose c...

Embodiment 2

[0054] Choose pure water as a solvent, disperse the freeze-dried solid two-dimensional montmorillonite in an aqueous solution, prepare a 5 mg / ml two-dimensional montmorillonite solution, and ultrasonicate the two-dimensional montmorillonite solution at a power of 100W for 0.5 hours , fully dispersed to form a uniform two-dimensional montmorillonite solution.

[0055] Place the mixed cellulose filter membrane with a pore size of 0.22 microns on the vacuum filter bottle, add 2 ml of two-dimensional montmorillonite solution to the Buchner funnel, turn on the circulating water vacuum pump, and filter out the two-dimensional montmorillonite solution. Water makes the two-dimensional montmorillonite tightly stacked on the surface of the cellulose microporous membrane. After air-drying at room temperature, a two-dimensional montmorillonite / cellulose composite filter membrane was obtained.

[0056] The two-dimensional montmorillonite / cellulose composite filter membrane that this embod...

Embodiment 3

[0058] Using solid montmorillonite and pure water as a solvent, a montmorillonite solution with a solid-to-liquid ratio of 10 g / L was prepared, and the montmorillonite solution was stirred at 500 rpm for 3 days. The stirred montmorillonite solution was centrifuged at 8000 rpm for 5 minutes, and the supernatant was taken to obtain a two-dimensional montmorillonite solution with a concentration of 1 mg / ml.

[0059] Spray the two-dimensional montmorillonite solution evenly on the 0.22 micron cellulose filter membrane, after natural air-drying, spray evenly again, air-dry naturally, repeat the above steps 5 times, and obtain the two-dimensional montmorillonite / cellulose composite accumulated many times filter membrane.

[0060] The two-dimensional montmorillonite / cellulose composite filter membrane that this embodiment prepares filters the Pb of 20 milliliters 50mg / L 2+ Solution, the concentration after filtration is 1mg / L. It shows that the composite membrane has good performan...

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Abstract

The invention relates to a method for preparing a two-dimensional montmorillonite/cellulose composite filtration membrane. The method comprises the following steps: (1) preparing a two-dimensional montmorillonite solution; (2) loading the two-dimensional montmorillonite solution onto a micro-porous cellulose filter membrane in a filtration manner; and (3) drying the two-dimensional montmorillonite-suported micro-porous cellulose filter membrane to obtain a two-dimensional montmorillonite/cellulose composite filter membrane, and closely stacking the two-dimensional montmorillonite on the surface of the micro-porous cellulose filter membrane to form a negatively-charged surface having a certain thickness. Compared with filter membranes in the prior art, the two-dimensional montmorillonite/cellulose composite filter membrane can effectively remove heavy metal ions and cationic dye pollutants in water. The preparation method has the advantages of simplicity, easiness in implementation, good repeatability and low product price, and the obtained two-dimensional montmorillonite/cellulose composite filter membrane can be used for removing heavy metal ions, cationic dyes and other pollutants in water.

Description

technical field [0001] The invention relates to the technical field of liquid membrane separation, in particular to a method for preparing a two-dimensional montmorillonite / cellulose composite filter membrane. Background technique [0002] Water resources are the material basis for human survival. With the development of the world economy, cities are increasing and expanding, and the water demand in various places is increasing, while the amount of available water resources is decreasing. The water resource crisis faced by human beings is intensifying. my country is one of the countries with extremely poor water resources. In recent years, my country's economy has developed rapidly, and the extensive development mode has brought serious water pollution problems, which directly aggravated the water resource crisis. Therefore, how to remove pollutants in water and improve the utilization rate of water resources has become the focus of current research. [0003] Membrane separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D71/02B01D69/12B01D67/00C02F1/469C02F101/20C02F101/30
CPCB01D67/0079B01D69/12B01D71/02B01D71/10C02F1/469C02F2101/20C02F2101/308
Inventor 赵美林思劼秦瑶
Owner TONGJI UNIV
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