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Composite flat membrane with regeneration capacity and preparation method thereof

A regenerative capacity, flat membrane technology, applied in the field of membrane separation, can solve problems such as hindering the large-scale application of membrane technology, blocking membrane pores, and decreasing permeation flux, so as to improve hydrophilicity and anti-fouling ability, and enhance adsorption performance. , the effect of restoring regeneration

Inactive Publication Date: 2015-01-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of problems such as membrane fouling, the permeation flux decreases with the prolongation of the operation time, and the adsorption and removal efficiency of the membrane also decreases, which seriously hinders the larger-scale application of membrane technology.
The adsorption of the membrane can effectively remove a certain amount of pollutants, but some hydrophobic solutes are prone to adsorption and deposition on the surface of the membrane, which will block the membrane pores, cause membrane pollution, reduce the performance of the membrane, and shorten the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a composite flat membrane with regeneration ability:

[0026] Step 1, configure 100 ml of 2.0wt% glacial acetic acid solution in a 250 ml Erlenmeyer flask, and dissolve 1 g of chitosan powder in the solution to prepare a 10 mg / ml chitosan solution. Stir the above-prepared solution on a magnetic stirrer at room temperature with a rotation speed of 500 rpm for 60 min.

[0027] Step 2, then add 0.1g of modified nano-TiO 2 , after ultrasonic dispersion for 30 min, stir evenly at room temperature, and the stirring speed is set to 500rmp; then add 0.5g activated carbon fiber to the solution, after ultrasonic dispersion for 30min, stir at room temperature and at a speed of 500rmp until the modified nano-TiO 2 and activated carbon fibers are uniformly dispersed; the dissolved solution is left to defoam at room temperature to obtain a casting solution.

[0028] Step 3: Quantitatively cast the film-casting solution in step 2 on a horizontal glass plate t...

Embodiment 2

[0035] A preparation method of a composite flat membrane with regeneration ability:

[0036] Step 1, configure 100 ml of 2.0wt% glacial acetic acid solution in a 250 ml Erlenmeyer flask, and dissolve 1 g of chitosan powder in the solution to prepare a 10 mg / ml chitosan solution. Stir the above-prepared solution on a magnetic stirrer at room temperature with a rotation speed of 500 rpm for 60 min.

[0037] Step 2, then add 0.01g of modified nano-TiO 2 , after ultrasonic dispersion for 30 min, stir evenly at room temperature, and the stirring speed is set to 500rmp; then add 0.5g activated carbon fiber to the solution, after ultrasonic dispersion for 30min, stir at room temperature and at a speed of 500rmp until the modified nano-TiO 2 and activated carbon fibers are uniformly dispersed; the dissolved solution is left to defoam at room temperature to obtain a casting solution.

[0038] Step 3: Quantitatively cast the film-casting solution in step 2 on a horizontal glass plate ...

Embodiment 3

[0045] A preparation method of a composite flat membrane with regeneration ability:

[0046] Step 1, configure 100 ml of 2.0wt% glacial acetic acid solution in a 250 ml Erlenmeyer flask, and dissolve 1 g of chitosan powder in the solution to prepare a 10 mg / ml chitosan solution. Stir the above-prepared solution on a magnetic stirrer at room temperature with a rotation speed of 500 rpm for 60 min.

[0047] Step 2, then add 0.05g of modified nano-TiO 2 , after ultrasonic dispersion for 30 min, stir evenly at room temperature, and the stirring speed is set to 500rmp; then add 1g of activated carbon fiber to the solution, after ultrasonic dispersion for 30min, stir at room temperature and at a speed of 500rmp until the modified nano-TiO 2 and activated carbon fibers are uniformly dispersed; the dissolved solution is left to defoam at room temperature to obtain a casting solution.

[0048] Step 3: Quantitatively cast the film-casting solution in step 2 on a horizontal glass plate...

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Abstract

The invention discloses a composite flat membrane with the regeneration capacity and a preparation method thereof. According to the composite flat membrane, the preparation method comprises the following steps: firstly, dissolving chitosan powder in an acetic acid glacial solution to prepare a chitosan solution; adding modified nano-TiO2 and active carbon fiber into the solution sequentially and mixing uniformly; then performing curtain coating on the mixed solution on a horizontal glass plate to form a membrane and drying under an infra-red lamp; and using the NaOH solution to clean the dried composite membrane to remove the residual acetic acid glacial on the membrane, then using distilled water to wash and airing at room temperature, so as to obtain the composite flat membrane with the regeneration capacity, which is doped with chitosan, active carbon fiber and modified nano-TiO2. According to the invention, the chitosan, active carbon fiber and modified nano-TiO2 are simultaneously fixed in the membrane, so that the hydrophilicity and pollution-resistant capability of the membrane are improved, the adsorbability of the membrane is enhanced, and meanwhile, catalytic oxidation of TiO2 in the membrane can be performed under UV (ultra violet) irradiation to degrade persistent organic pollutants adsorbed in the membrane, so that the membrane can be regenerated.

Description

technical field [0001] The invention relates to a composite flat membrane with regeneration capability and a preparation method thereof, belonging to the technical field of membrane separation. Specifically, it relates to a composite flat film with strong anti-pollution ability and strong adsorption ability, which can undergo catalytic oxidation under ultraviolet light irradiation to restore its regeneration ability and its preparation method. Background technique [0002] With the rapid development of industry and agriculture, a large amount of sewage containing pesticides, chlorophenols, nitrobenzenes and other refractory organic pollutants is discharged into natural water bodies, seriously threatening human health and the stability of the ecosystem. At the same time, due to the refractory nature of these pollutants, it is difficult to be effectively removed by biotechnology. In order to improve the removal rate of pollutants and ensure water safety, water purification of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/08B01D71/02B01D69/06B01D67/00B01D69/12B01D69/02
Inventor 李轶王晴吴悦王玉明王大伟胡磊
Owner HOHAI UNIV
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