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Composite film with titanium dioxide layer and gold nanoparticles on surface and preparation method and application of composite film

A technology of nano-gold particles and titanium dioxide, which is applied in the field of membrane separation, can solve the problems of easy peeling off of the antibacterial layer, long time required for antibacterial, and limited application range

Inactive Publication Date: 2020-10-27
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of such antibacterial substances can be applied to tap water or industrial water. For safety reasons, it cannot be used in drinking water treatment.
In addition, the addition of some antibacterial agents will not only cause secondary pollution of water quality, but also cause bacteria to develop drug resistance and lose antibacterial function after long-term use
[0004] Scientists at home and abroad try to modify the surface of the material to improve the antibacterial properties of the material. The representative antibacterial film is the antibacterial film doped with titanium oxide, which has good antibacterial performance, but there are still the following key problems: (1) Oxidation Titanium nanoparticles and the surface of the membrane are prepared and doped on the surface of the membrane by physical blending, and the antibacterial layer is easy to fall off during long-term operation, causing secondary pollution; (2) The absorption of light by pure titanium oxide nanoparticles is mainly concentrated in the ultraviolet region and near-ultraviolet region, but the absorption of visible light is weak, which leads to the antibacterial effect of the titanium oxide complex, which mainly exerts its hydrophilic effect of reducing bacterial adsorption, while its superior light-generating free radical sterilization effect is not fully obtained. (3) The existing antibacterial film based on titanium oxide usually needs to be illuminated for 3-7 hours to achieve the antibacterial effect. It takes a long time for antibacterial, and the antibacterial effect needs to be further improved. promote

Method used

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  • Composite film with titanium dioxide layer and gold nanoparticles on surface and preparation method and application of composite film
  • Composite film with titanium dioxide layer and gold nanoparticles on surface and preparation method and application of composite film
  • Composite film with titanium dioxide layer and gold nanoparticles on surface and preparation method and application of composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example is the preparation of composite membrane sample 1.

[0047] (1) Set the area to 0.05cm 2 The PVDF base film pretreatment method is: rinse with water and isoglycol in sequence and then dry. (2) Put the base film treated in step (1) into the atomic layer deposition reaction device, vacuumize, control the pressure to 50Pa, add titanium precursor to deposit layer by layer, the number of layers is 200 layers, and the temperature is controlled at 100°C. (3) Place the PVDF base film with a titanium dioxide-modified layer on the surface in a mixed solution containing methanol and chloroauric acid, and place it under a high-pressure xenon lamp (PLS-SEX300UV, 300W, Beijing Bofeilai Technology Co., Ltd.) for 30 minutes, After the light deposition, the obtained composite film was dried in a vacuum oven at 60° C. to obtain Comparative Sample 3. Wherein the mixed solution consumption is 5mL, the gold chlorate concentration in the solution is 400mg / L, and methanol accou...

Embodiment 2

[0052] This example is the preparation of composite membrane sample 2.

[0053] (1) Set the area to 0.05cm 2 The PVDF base film pretreatment method is: rinse with water and isoglycol in sequence and then dry. (2) Put the base film treated in step (1) into the atomic layer deposition reaction device, vacuumize, control the pressure to 50Pa, add titanium precursor to deposit layer by layer, the number of layers is 200 layers, and the temperature is controlled at 100°C. (3) Place the PVDF base film with a titanium dioxide-modified layer on the surface in a mixed solution containing methanol and chloroauric acid, and place it under a high-pressure xenon lamp (PLS-SEX300UV, 300W, Beijing Bofeilai Technology Co., Ltd.) for 30 minutes, After the photo-deposition, the obtained composite film was dried in a vacuum oven at 60° C. to obtain Comparative Sample 3. The amount of the mixed solution is 20 μL, the concentration of gold chlorate in the solution is 1000 mg / L, and methanol acco...

Embodiment 3

[0057] In this embodiment, the antibacterial properties of the comparative sample 1, the comparative sample 2, the composite membrane sample 1, and the composite membrane sample 2 were detected by the plate counting method: Escherichia coli was used as the strain for the test. The membrane samples to be tested were exposed to Escherichia coli bacterial suspension (10 8 cfu / mL) 3h. After discarding the bacterial suspension, use excess saline solution to rinse unattached cells from the membrane. The membrane to be tested was then transferred into 5 mL of saline solution and sonicated for 5 min in an ultrasonic bath (26W L-1, FS60 ultrasonic cleaner) to detach the bacteria from the membrane surface. After removing the bacteria from the membrane surface, the supernatant was diluted 10-fold, 100-fold and 1000-fold, then immediately cultured on LB agar medium and incubated overnight at 37°C for cfu counting. Taking the cfu of PVDF base film comparison sample 1 as a reference, calc...

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Abstract

The invention discloses a composite film with a titanium dioxide layer and gold nanoparticles on the surface. The composite film sequentially comprises a base film, a titanium dioxide layer and nanogold particles, wherein the nanogold particles are dispersed on the titanium dioxide layer, the diameter of the nanogold particles is 0.5-200 nm, and the mass of the nanogold particles on each square meter of the composite film is 0.03-0.05 g. The invention also discloses a preparation method and application of the composite film. The nanogold particles are deposited on the titanium dioxide layer, so that the visible light absorption capacity of the titanium dioxide modified layer can be improved, and the problems of weak visible light absorption and limited application range of a composite filmtaking titanium dioxide as a main component are solved. The number of free radicals is increased, chemical damage is enhanced, and the antibacterial effect is further improved. The nanogold particleson the surface of the composite film are small in diameter and small in dosage, the efficient antibacterial effect can be achieved by depositing the nanogold particles with the extremely-low amount,and the cost can be reduced. In addition, the composite film can also be used for decomposing dyes.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite membrane with a titanium dioxide nanorod array on its surface, a preparation method and application thereof. Background technique [0002] Membrane fouling is the most important problem in the industrial promotion of membranes worldwide. Membrane fouling will cause a series of problems such as high operating pressure and maintenance costs, influent water loss and product water quality degradation, reduced service time, and reduced membrane life. Among them, bacterial pollution is an important source of pollution, and if bacteria are deposited on the surface of the membrane, in addition to the hazards of ordinary pollution, the number of bacteria will increase sharply due to their self-reproduction, and the diversification of metabolites will easily cause secondary pollution of water quality. The process is easy to damage the membrane structure and other h...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00C02F1/30B01J31/38B01J23/52B01J37/34C02F101/30
CPCB01D69/12B01D67/0002B01D67/0039B01D67/0079C02F1/30B01J31/38B01J23/52B01J37/344B01D2325/48C02F2101/308B01J35/393B01J35/399B01J35/23B01J35/59B01J35/39
Inventor 张蕾史星星唐娜王松博田桂英程鹏高张建平
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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