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Antibiotic cellulose acetate nanofiltration membrane and its preparation method

A technology of cellulose acetate and cellulose diacetate is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of high volume, strong resistance to microbial erosion, and improved water flux

Active Publication Date: 2007-10-17
SHIJIAZHUANG NO 4 PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a nanofiltration membrane material, the biggest disadvantage of cellulose acetate is its poor antibacterial performance, and it is easily eroded and decomposed by many microorganisms, thereby shortening its service life, resulting in limited use range and high use cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Chemical modification on the surface of antibacterial nanoparticles: put 5g of nano-titanium dioxide powder into the plasma reaction chamber, alternately carry out argon and vacuum three times, then introduce modified gas oxygen and discharge at a pressure of 20Pa and a discharge power of 60W Under the condition of glow discharge for 25 minutes, keep it under vacuum condition for 2 hours, remove the vacuum, take out the chemically modified titanium dioxide nanoparticles from the reaction chamber and prepare a mass fraction of 500×10 -6 The dioxane solution is standby;

[0022] (2) Preparation of casting solution: first add 3.5kg diacetate cellulose, 2.2kg triacetate cellulose and 0.8kg maleic acid into a stainless steel dissolution kettle, then add 14kg dioxane, 2.6kg methanol, 7kg Acetone was slowly added to the reaction kettle one by one, stirred at 60°C until the system was a transparent solution, then slowly added 3kg with a mass fraction of 500×10 -6 The dioxa...

Embodiment 2

[0026] (1) Chemical modification on the surface of antibacterial nanoparticles: get 5g of nano-titanium dioxide powder and put it into the pulsed plasma reaction chamber. Under the condition of 80W, after glow discharge for 10min, keep it under vacuum condition for 3 hours, remove the vacuum, take out the chemically modified titanium dioxide nanoparticles from the reaction chamber and make a mass fraction of 500×10 -6 The dioxane solution is ready for use.

[0027] (2) Preparation of casting solution: 3.8kg diacetate cellulose, 2.5kg triacetate cellulose and 0.7kg maleic acid were added to the stainless steel dissolution kettle, then 14.1kg dioxane, 1.7kg ethanol, 7.4kg acetone and 3.4kg mass fraction is 500×10 -6The dioxane solution of chemically modified titanium dioxide nanoparticles was slowly added to the reaction kettle in turn, and stirred at 63°C for 12 hours. When the system was a qualified true solution, stop stirring, filter, and stand for defoaming before use. . ...

Embodiment 3

[0031] Except that the following parameters are modified, the others are the same as in Example 1, and the specific modifications are as follows: the nanoparticles in the step (1) are replaced with nano-silver, the discharge power is 50W, and the glow discharge time is 15min, and the nano-silver after the chemical modification is made into Quality score is 250×10 -6 dioxane solution; in step (2), the dioxane consumption is 13.0kg, and the mass fraction is 250×10 -6 The consumption of nanometer silver dioxane solution is 4.0kg. Soak the nanofiltration membrane in groundwater without any treatment. Under the conditions of operating pressure of 0.69Mpa and operating temperature of 25°C, the desalination rate and water flux of the membrane were measured before soaking and after soaking for 6 months. The results are as follows: Table 3 shows.

[0032] Soaking time

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Abstract

The invention discloses an antibacterial cellulose acetate nanofiltration membrane and a preparation method thereof. The casting film liquid, composed of 5-14% by weight of secondary cellulose acetate, 3-9% by weight of cellulose triacetated, 15-24% by weight of acetone, 1-5% by weight of maleic acid, 50-55% by weight of dioxane, 5-12% by weight of porogens that is methanol or ethanol and chemical modified nano-particle, is treated to obtain the antibacterial cellulose acetate natrium filter film after filtrating, debubbling, film flotation on the base cloth, solidifying in the gel baith and post processing. The invention brings the plasm chemical modified antibacterial nano-particle into the cellulose acetate nanofiltration membrane to make the nanofiltration membrane have a strong bacteriostasis and sterilization function, and the surface of the nanofiltration membrane is hard to absorb alga and animalcule to raise the use life and the service efficiency of the nanofiltration membrane remarkably. The antibacterial cellulose acetate nanofiltration membrane prepared based on the invention has the advantage of a steady structural properties, a strong erosion-resisting vharacteristics by animalcule and a high water flux of the film. The invention can be broadly used in the field of treatment of ground drinking water, biological pharmacy and the pretreatment of sea water desalination.

Description

technical field [0001] The invention relates to a nanofiltration membrane and a preparation method thereof, in particular to an antibacterial cellulose acetate nanofiltration membrane modified with chemically modified antibacterial nanoparticles and a preparation method thereof, belonging to the technical field of chemical industry separation. Background technique [0002] Nanofiltration membrane technology is currently one of the most advanced membrane separation and filtration technologies in the world. It is characterized by low energy consumption, wide application range, good pressure tightness, low rejection rate for monovalent ions and low rejection rate for divalent ions and High rejection rate of molecular organics. As a drinking water treatment membrane, while removing low-molecular organic matter and heavy metal ions that are harmful to the human body in drinking water, it can also retain trace elements that are beneficial to the human body in the water. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D71/82
Inventor 赵雄燕王明珠赵幸生宫朝辉
Owner SHIJIAZHUANG NO 4 PHARMA
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