Self-cleaning type titanium dioxide nano-fiber membrane material as well as preparation method and application thereof

A nanofiber membrane, titanium dioxide technology, applied in the field of separation and treatment of environmental pollutants, can solve the problems of limiting the practical application of nanofiber membranes, low mechanical strength of nanofiber membranes, weak bonding force between nanofibers, etc. Industrial application, stable properties, high repeatability

Active Publication Date: 2018-11-09
南京盈润门窗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is complicated, and it is not easy to obtain good repeatability, and the pores in the formed nanofibrous membrane are relatively large, so it is difficult to realize the treatment of small organic molecules and nanoparticles with a particle size of only a few nanometers, such as gold. Effective interception of silver nanoparticles, quantum dots, carbon dots, etc.
In addition, the mechanical strength of the prepared nanofibrous membrane is very low due to the weak binding force between the synthesized nanofibers, which limits the practical application of the nanofibrous membrane as a separation tool.

Method used

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  • Self-cleaning type titanium dioxide nano-fiber membrane material as well as preparation method and application thereof
  • Self-cleaning type titanium dioxide nano-fiber membrane material as well as preparation method and application thereof
  • Self-cleaning type titanium dioxide nano-fiber membrane material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a method for preparing a self-cleaning titanium dioxide nanofiber membrane material, comprising the following steps:

[0056] S0. Cut the carbon paper into small pieces of 50mm×20mm×0.20mm, then use acetone, isopropanol, ethanol and water to wash ultrasonically for 10min, and then dry at 80°C; in this step, use acetone to wash the carbon paper, and then Washing with isopropanol and ethanol in sequence can further remove impurities remaining on the surface of the carbon paper and obtain cleaner carbon paper;

[0057] S1. Add 20mL tetrabutyl titanate into a 200mL beaker, add 100mL absolute ethanol while stirring, then add 0.2mL glacial acetic acid, and keep stirring at room temperature until the reaction solution is milky white to obtain a titanium dioxide sol;

[0058] S2. impregnating the carbon paper in the titanium dioxide sol, and adsorbing titanium dioxide nanoparticles on the surface of the carbon paper to obtain carbon paper loaded with ti...

Embodiment 2

[0076] The titanium dioxide nanofiber membrane material prepared in Example 1 was used to test the filtration performance and self-cleaning performance of organic dye molecules.

[0077] First, the filtration performance of titanium dioxide nanofiber membranes for organic dye molecules was tested. Positively charged rhodamine B (hereinafter referred to as: RhB) was selected as a model molecule to study the enrichment and filtration properties of titanium dioxide nanofibrous membrane materials for organic molecules. Cut the titanium dioxide nanofiber membrane material into small pieces of 2cm×2cm, and fix them in a self-made filter device with silicone rubber. Take 7mL concentration to be 10mg·L -1 The RhB solution was placed in a self-made filter device, and the solution was allowed to pass through the titanium dioxide nanofiber membrane material automatically to reach the bottom of the device. After the solution is completely filtered, test the ultraviolet-visible absorptio...

Embodiment 3

[0087] The titanium dioxide nanofiber membrane material prepared in Example 1 was used to test the filtration performance of nanoparticles. Taking gold nanoparticles and carbon dots, which have been widely studied and applied, as the filtration objects, the filtration performance of this titanium dioxide nanofiber membrane material on fine nanometer solid particles is studied.

[0088] Figure 14 is the TEM figure of gold nanoparticles in the present invention; Figure 15 It is a TEM picture of carbon dots in the present invention. As shown, the particle sizes of the two are about 12nm and 4.5nm, respectively.

[0089] Install the plexiglass plate fixed with the titanium dioxide nanofiber membrane material in the self-made filter device, respectively add the gold nanoparticle and carbon dot dispersion liquid above the titanium dioxide nanofiber membrane material, let it stand, let the solution automatically pass through the fiber membrane to reach the bottom of the device b...

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Abstract

The invention relates to a preparation method and application of a self-cleaning type titanium dioxide nano-fiber membrane material. The method comprises the following steps: adding a titanium sourceinto a reaction container; while stirring, adding absolute ethyl alcohol; then adding glacial acetic acid and continuously stirring at room temperature until a reaction solution is milky white, so asto obtain titanium dioxide sol; immersing carbon paper into the titanium dioxide sol and adsorbing titanium dioxide nanoparticles on the surface of the carbon paper, so as to obtain carbon paper loaded with the titanium dioxide nanoparticles; putting the obtained carbon paper into a sodium hydroxide solution and carrying out hydrothermal reaction; forming titanium dioxide nano-fibers on the surface of the carbon paper and carrying out self-assembling to obtain the titanium dioxide nano-fiber membrane material. The self-cleaning type titanium dioxide nano-fiber membrane material prepared by thepreparation method has good filtering performance on organic molecules and nanoparticles with positive charges.

Description

technical field [0001] The invention relates to the field of separation and treatment of environmental pollutants, in particular to a self-cleaning titanium dioxide nanofiber membrane material and its preparation method and application. Background technique [0002] The environmental pollution caused by organic molecules and nano-solids is becoming more and more prominent, and it is of great significance to study the separation and recovery of these pollutants. The separation of organic pollutants, especially small organic molecules, generally adopts column chromatography, but this method has a complicated pre-treatment process, a long analysis time, and requires the operator to have skilled experimental skills. The surface of nanoparticles is usually modified with hydrophilic or hydrophobic functional groups, which can be dispersed in the solution stably for a long time. Traditional separation techniques, such as centrifugation and nanofiltration, are very difficult to sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0039B01D71/024
Inventor 王永徐凯隋美蓉吴长宇庄银苹
Owner 南京盈润门窗科技有限公司
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