Preparation method of porous nano antibacterial particles and composite nanofiltration membrane, and composite nanofiltration membrane

A technology of antibacterial particles and nanoparticles, applied in the field of membrane separation, can solve the problems of high antibacterial performance and membrane flux on the surface of the membrane, and achieve the effects of improving antibacterial and anti-pollution performance, high retention rate, and increasing water flux

Pending Publication Date: 2020-01-17
深圳市君脉膜科技有限公司
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Problems solved by technology

[0006] In order to solve the technical problem that the existing nanofiltration membrane cannot take into account the good antibacterial performance of the membrane surface and the large membrane flux, the present invention proposes a method for preparing porous nano-antibacterial particles and a composite nanofiltration membrane with remarkable and durable antibacterial effect and long service life. The composite nanofiltration membrane prepared by it

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  • Preparation method of porous nano antibacterial particles and composite nanofiltration membrane, and composite nanofiltration membrane
  • Preparation method of porous nano antibacterial particles and composite nanofiltration membrane, and composite nanofiltration membrane
  • Preparation method of porous nano antibacterial particles and composite nanofiltration membrane, and composite nanofiltration membrane

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preparation example Construction

[0038] The invention provides a method for preparing porous copper-clad titanium dioxide nanometer antibacterial particles, which comprises:

[0039] Put titanium tetrachloride dropwise into an ice-water bath while vigorously stirring, add ammonium sulfate and concentrated hydrochloric acid aqueous solutions dropwise into the obtained titanium tetrachloride aqueous solution, and stir at a temperature below 15°C to obtain a mixture. The mixture was heated up to 93°C to 97°C and kept warm for 1 hour, then added concentrated ammonia water to adjust the pH value to 5-7, cooled to room temperature, and stood still for 12 hours to obtain titanium dioxide sol. Add 15% to 110% by weight of titanium tetrachloride β-cyclodextrin into the titanium dioxide sol, and stir vigorously at the same time, adjust the pH value to 5-6, and continue stirring for 1 hour to obtain the titanium dioxide glue. Put the titanium dioxide glue solution into a hydrothermal reaction kettle, and conduct a hydro...

Embodiment 0-6

[0049] Step 1: Preparation of Porous Copper-clad Titanium Dioxide Nanoparticles

[0050] Titanium tetrachloride was used as a precursor, and 40ml of TiCl4 was dropped into pure water under vigorous stirring in an ice-water bath. The aqueous solution dissolved in ammonium sulfate and concentrated hydrochloric acid is added dropwise to the obtained titanium tetrachloride aqueous solution, stirred, and the temperature is controlled below 15°C during the mixing process. After heating the mixture to 95°C and keeping it warm for 1 hour, add concentrated ammonia water, adjust the pH value to about 6, cool to room temperature, let it stand for 12 hours, and then wash with pure water, precipitate, and remove the supernatant for multiple washings. Under the condition of vigorous stirring, β-cyclodextrin was added to the cleaned titanium dioxide sol, and the amount of β-cyclodextrin added was 90% of titanium tetrachloride; the pH value of the solution was adjusted to 5-6, Continue to st...

Embodiment 7

[0069] Step 1 is the same as the above-mentioned embodiment;

[0070] Step 2: Preparation of Porous Copper-coated TiO2 Nano Antibacterial Particles Composite Antibacterial Nanofiltration Membrane

[0071] 18% (ratio to piperazine) porous copper coated TiO 2The nanoparticles were added to a 2.75wt% piperazine aqueous solution, and the nanoparticles were uniformly dispersed in the solution by ultrasonic vibration for 80 minutes.

[0072] Immerse the wet polysulfone support membrane in the above-mentioned piperazine aqueous solution for 4min, remove the excess aqueous solution on the surface of the polysulfone support membrane with a blower, then pour the decane solution of 0.95wt% trimesoyl chloride onto the surface of the above-mentioned polysulfone support membrane, Interfacial polymerization for 50 seconds. After the composite membrane was dried in the air for 4 minutes, it was heat-treated, and treated at 100° C. for 2 minutes to obtain a nanoporous antibacterial particle ...

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Abstract

The invention discloses a preparation method of porous nano antibacterial particles and a composite nanofiltration membrane and the composite nanofiltration membrane. The preparation method of the porous nano-antibacterial particle composite nanofiltration membrane comprises the following steps: 1, adding porous copper-coated TiO2 nano-antibacterial particles into a basic solution, and uniformly embedding the porous nano-antibacterial particles into the basic solution through ultrasonic dispersion or strong stirring to prepare a monomer solution; wherein the basic solution is a polybasic acylchloride solution and a piperazine aqueous solution, or a polybasic acyl chloride solution and an aqueous solution of a mixture of piperazine and polyamine; and 2, carrying out interfacial polymerization reaction on the monomer solution on the surface of an ultrafiltration support membrane layer to obtain the porous copper-coated TiO2 nano antibacterial particle composite nanofiltration membrane.The prepared porous copper-coated titanium dioxide nano antibacterial particle composite nanofiltration membrane is large in water flux, high in desalination rate, resistant to bacterial pollution, easy to clean and capable of being widely applied to the application fields of sewage treatment, material concentration, decoloration, desalination of alkaline water or seawater and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing porous nanometer antibacterial particles, a composite nanofiltration membrane and the composite nanofiltration membrane. Background technique [0002] Nanofiltration is a new membrane separation technology between ultrafiltration and reverse osmosis. The operating pressure range is 0.2-1.0MPa, and the molecular weight cut-off of the membrane is in the range of 200-1000. The nanofiltration membrane has the characteristics of low operating pressure, high removal rate of divalent and above salts, and low removal rate of monovalent salts. Nanofiltration membranes are currently widely used in water reuse, water softening, pharmaceutical, food and biological industries. In the actual application process, the nanofiltration membrane will be attacked by rapidly growing bacteria in the water and cause microbial pollution, resulting in a decrease in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56B01D69/12B01D69/02B01D67/00B01D61/00
CPCB01D71/022B01D71/024B01D71/68B01D71/56B01D67/0079B01D69/02B01D69/12B01D61/027B01D2325/48B01D2325/36
Inventor 段伟杨瀚
Owner 深圳市君脉膜科技有限公司
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