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Preparation methods for porous nano antibacterial particles and composite hollow membrane and composite hollow membrane

A technology of antibacterial particles and nanoparticles, which is applied in the field of membrane separation, can solve the problems of large membrane flux, large water flux, and anti-bacterial pollution on the antibacterial performance of the membrane, so as to reduce membrane operation and maintenance costs, prolong service life, The effect of reducing pollution

Pending Publication Date: 2020-02-14
SHENZHEN WATERFROM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the technical problem that the existing hollow fiber filter membrane cannot take into account the good antibacterial performance of the membrane surface and the large membrane flux, the present invention proposes a porous nano-antibacterial particle and composite hollow fiber with large water flux, anti-bacterial pollution, and easy cleaning. Preparation method of filter membrane and composite hollow fiber filter membrane prepared therefrom

Method used

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  • Preparation methods for porous nano antibacterial particles and composite hollow membrane and composite hollow membrane
  • Preparation methods for porous nano antibacterial particles and composite hollow membrane and composite hollow membrane
  • Preparation methods for porous nano antibacterial particles and composite hollow membrane and composite hollow membrane

Examples

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preparation example Construction

[0039] The invention provides a method for preparing porous copper-clad titanium dioxide nanometer antibacterial particles, which comprises:

[0040] 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 1

[0049] 1. Preparation of Porous Copper-coated Titanium Dioxide Nanoparticles

[0050] Using titanium tetrachloride as the precursor, 100ml of TiCl 4 Drop into pure water. The aqueous solution dissolved in ammonium sulfate and concentrated hydrochloric acid is added dropwise to the obtained titanium tetrachloride aqueous solution, and the mixture is 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 stir for 1h, put it into a hydrothermal ...

Embodiment 0 and 2-7

[0062] The same steps as in Example 1, except that the content of porous copper-clad titanium dioxide nano-antibacterial particles added to the casting solution is changed, and the ratios to PVDF are: 0%, 1.0%, 2.0%, 3.0%, 3.5% , 4.0%, 5.0%.

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Abstract

The invention discloses preparation methods for porous nano antibacterial particles and a composite hollow membrane and the composite hollow membrane. The preparation method for the porous nano antibacterial particles comprises the steps: adding titanium tetrachloride into water, adding ammonium sulfate and concentrated hydrochloric acid, carrying out stirring, then, carrying out heating-up and heat preserving, and adding stronger ammonia water for cooling; adding beta-cyclodextrin, and carrying out stirring, so as to obtain glue; subjecting the glue to a hydrothermal reaction, so as to obtaintitanium dioxide nanoparticle sol; adding CuCl2 and sodium dodecylbenzene sulfonate into the particle sol, carrying out stirring, then, adding a reducer and pure water, and carrying out mixing, so asto obtain a reactant; subjecting the reactant to a light induced reaction, so as to prepare copper-coated titanium dioxide nanoparticles; and washing the copper-coated particles, carrying out baking,and then, carrying out calcination, thereby preparing the porous copper-coated titanium dioxide nano antibacterial particles. The composite hollow-fiber filter membrane prepared by using the particles is high in water flux, high in porosity, resistant to bacterial contamination and easy to clean and can be extensively applied to the fields of sewage and water treatment, material concentrating, pretreatment of brackish water and seawater desalinization, and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method of a porous copper-coated titanium dioxide nanometer antibacterial particle and a composite hollow fiber filter membrane with the particle and the composite hollow fiber filter membrane. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living standards, the requirements for the environment, especially the safety of the water environment, are getting higher and higher. In order to obtain more stable and high-quality effluent water, more and more membrane water treatment technologies are used in sewage treatment and drinking water treatment processes, among which hollow fiber ultra / microfiltration membranes are more and more widely used. Membrane bioreactor (MBR) and tap water membrane filtration have become the most promising wastewater and water treatment technologies in th...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/08B01D69/02B01D67/00
CPCB01D71/024B01D69/02B01D69/08B01D67/0044B01D2325/36B01D2325/48
Inventor 段伟杨瀚
Owner SHENZHEN WATERFROM TECH
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