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Cellulose acetate-based nano-material composite ultrafiltration membrane and preparation method thereof

A cellulose acetate, nanomaterial technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problem of water flux decline of cellulose acetate ultrafiltration membrane, CA ultrafiltration membrane water flux decline, ultrafiltration membrane problems such as low porosity, to achieve the effect of improving water flux and anti-pollution ability, low price, and improving water flux

Inactive Publication Date: 2017-05-10
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CA ultrafiltration membrane has many advantages, cellulose acetate delays phase separation due to its own hydrophilicity, so that the porosity of cellulose acetate ultrafiltration membrane is low and the water flux is relatively low. Small, the efficiency of membrane separation is low
In addition, in the process of membrane separation of cellulose acetate ultrafiltration membrane, bacteria, algae, fungi, proteins, colloids, cells, etc. in the surrounding environment will adsorb and block the pore size of the cellulose acetate ultrafiltration membrane, resulting in The water flux of cellulose acetate ultrafiltration membrane decreases, and the phenomenon of membrane fouling increases
Membrane fouling will seriously reduce the water flux of CA ultrafiltration membrane, reduce the efficiency of membrane separation and the service life of membrane

Method used

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  • Cellulose acetate-based nano-material composite ultrafiltration membrane and preparation method thereof
  • Cellulose acetate-based nano-material composite ultrafiltration membrane and preparation method thereof
  • Cellulose acetate-based nano-material composite ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The halloysite nanotubes weighing 1.0g are dissolved in the Tris-HCl buffer solution of 200ml PH=8.8, ultrasonically dispersed for 0.5-1h, so that the halloysite nanotubes are uniformly dispersed; the dispersed halloysite nanotubes (i.e. HNTS) is put into a constant temperature water bath with magnetic stirring, the temperature of the water bath is 25-30°C, and the rotating speed is 250r / min-300r / min, slowly add 0.4g of levodopa (ie L -DOPA), the stirring time is 12-14h; after the reaction is completed, the halloysite of the load levodopa is centrifuged with a centrifuge, the rotating speed of the centrifuge is 10000r / min, and the centrifugation time is 45-60min; after the centrifugation, use a freeze dryer Removal of water yields levodopa-loaded halloysite nanotubes (ie, LPDHNTS).

[0031]Weigh 0.03g of prepared LPDHNTS and dissolve in 16.40g of dimethylacetamide (i.e. DMAC), ultrasonically treat for 30min-45min to disperse LPDHNTS evenly, then add 3.00g of cellulose a...

Embodiment 2

[0036] The halloysite nanotubes weighing 1.0g are dissolved in the Tris-HCl buffer solution of 200ml PH=8.8, ultrasonically dispersed for 0.5-1h, so that the halloysite nanotubes are uniformly dispersed; the dispersed halloysite nanotubes (i.e. HNTS) is put into a constant temperature water bath with magnetic stirring, the temperature of the water bath is 25-30°C, and the rotating speed is 250r / min-300r / min, slowly add 0.4g of levodopa (ie L -DOPA), the stirring time is 12-14h; after the reaction is completed, the halloysite of the load levodopa is centrifuged with a centrifuge, the rotating speed of the centrifuge is 10000r / min, and the centrifugation time is 45-60min; after the centrifugation, use a freeze dryer Removal of water yields levodopa-loaded halloysite nanotubes (ie, LPDHNTS).

[0037] Weigh 0.06g of the prepared LPDHNTS and dissolve it in 16.40g of dimethylacetamide (i.e. DMAC), ultrasonically treat it for 30min-45min to disperse the LPDHNTS evenly, then add 3.00g...

Embodiment 3

[0042] The halloysite nanotubes weighing 1.0g are dissolved in the Tris-HCl buffer solution of 200ml PH=8.8, ultrasonically dispersed for 0.5-1h, so that the halloysite nanotubes are uniformly dispersed; the dispersed halloysite nanotubes (i.e. HNTS) is put into a constant temperature water bath with magnetic stirring, the temperature of the water bath is 25-30°C, and the rotating speed is 250r / min-300r / min, slowly add 0.4g of levodopa (ie L -DOPA), the stirring time is 12-14h; after the reaction is completed, the halloysite of the load levodopa is centrifuged with a centrifuge, the rotating speed of the centrifuge is 10000r / min, and the centrifugation time is 45-60min; after the centrifugation, use a freeze dryer Removal of water yields levodopa-loaded halloysite nanotubes (ie, LPDHNTS).

[0043] Weigh 0.09g of the prepared LPDHNTS and dissolve it in 16.40g of dimethylacetamide (i.e. DMAC), ultrasonically treat it for 30min-45min to disperse the LPDHNTS evenly, then add 3.00g...

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Abstract

The invention relates to a cellulose acetate-based nano-material composite ultrafiltration membrane and a preparation method thereof. The cellulose acetate-based nano-material composite ultrafiltration membrane provided by the invention comprises two components including halloysite nanotubes and cellulose acetate, wherein levodopa is loaded on the halloysite nanotubes; after all the components are prepared into a membrane casting solution, a coated membrane is conveyed into a coagulation bath and is subjected to phase separation to form the membrane. According to the preparation method provided by the invention, the prepared ultrafiltration membrane has the advantages that the water flux is relatively high, the anti-pollution capability is relatively good, the membrane is relatively easy to wash and the like; the cellulose acetate and the halloysite nanotubes have the advantages of environment friendliness, relatively low price, wide source, degradability and the like. The cellulose acetate-based ultrafiltration membrane prepared by the method has very good market application prospect and industrial production value.

Description

technical field [0001] The invention belongs to the technical field of membrane separation water treatment, and in particular relates to a cellulose acetate-based nanomaterial composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration separation has its unique advantages: good stability, high efficiency, simple operation, no phase change in the operation process, environmental protection and pollution-free, and low cost. Therefore, it is used in: metallurgy, industrial wastewater treatment, drinking water, whey treatment in the production process of dairy products, biological separation of electroplating coating mixture, and pretreatment process of seawater desalination. In the process of ultrafiltration membrane membrane separation, as the ultrafiltration proceeds, the separated substances adsorb, block the pore size of the ultrafiltration membrane, and contaminate the ultrafiltration membrane, resulting in a decrease ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/16B01D67/00B01D61/14
CPCB01D61/145B01D67/0079B01D69/02B01D69/12B01D71/025B01D71/027B01D71/16B01D2325/36B01D2325/48
Inventor 张大伦穆可广邵自强李友琦陈静秦笃建罗伟钮嘉宝魏洁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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