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A kind of preparation method of manganese-doped titanium dioxide nanofiber material

A titanium dioxide and nanofiber technology, applied in the field of photocatalytic materials, can solve the problems of limiting the application effect of titanium oxide, low light utilization rate, etc., and achieve the effect of avoiding the reduction of catalytic efficiency, increasing photoelectric conversion and transmission efficiency, and enhancing absorption.

Active Publication Date: 2020-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Description
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  • Application Information

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Problems solved by technology

Too low light utilization rate seriously limits the application effect of titanium oxide

Method used

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  • A kind of preparation method of manganese-doped titanium dioxide nanofiber material
  • A kind of preparation method of manganese-doped titanium dioxide nanofiber material
  • A kind of preparation method of manganese-doped titanium dioxide nanofiber material

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preparation example Construction

[0028] An embodiment of the present invention provides a method for preparing a manganese-doped titanium dioxide nanofiber material, comprising:

[0029] S1: Ultrasonic dispersion of amphiphilic cationic short peptide molecules in water, adjust the pH value of the solution, and leave it at room temperature for more than 1 week to obtain self-assembled templates of amphiphilic cationic short peptides

[0030] In this step, a one-dimensional organic template is constructed by self-assembly of amphiphilic cationic short peptides. Specifically, after the amphiphilic cationic short peptide is ultrasonically dispersed in water, the pH value of the system is adjusted to near neutral, and the self-assembly solution of the amphiphilic short peptide is obtained by standing still for more than one week. In this step, because amphiphilic cationic short peptides are used, the near-neutral pH value can protonate the side chains of cationic amino acid residues, provide electrostatic interact...

Embodiment 1

[0043] Preparation of manganese-doped titania nanofibers

[0044] (1) Preparation of Amphiphilic Cationic Short Peptide Self-Assembly Solution

[0045] Disperse a certain amount of amphiphilic cationic short peptide in water, ultrasonically disperse, adjust the pH value of the solution to 5-9, and place it at room temperature for 7-14 days to obtain an amphiphilic cationic short peptide self-assembly solution;

[0046] (2) Synthesis of manganese-doped titania nanofiber materials

[0047] A) Titanium dioxide precursor, potassium permanganate solution and manganese nitrate solution are sequentially added to the amphiphilic short peptide self-assembly solution, amphiphilic cationic short peptide, titanium dioxide precursor, potassium permanganate, nitric acid in the solution The concentration of manganese is 0.5-10mmol L respectively -1 , 1-10mmol L -1 , 0.001-0.1mmol L -1 , 0.0015-0.15mmol L -1 , vortexed, reacted at room temperature for 10-24 hours, centrifuged (5000-10000...

Embodiment 2

[0050] Morphology and structure characterization of manganese-doped titania nanofibers

[0051] A high-resolution transmission electron microscope is used, model: JEM-2100UHR, instrument manufacturer: JEOL, and accelerating voltage: 200kV.

[0052] In this example, a high-resolution transmission electron microscope is used to observe the morphology and structure of the manganese-doped titanium dioxide nanofiber material. Specifically, the sample is dispersed in ethanol, dropped on a copper grid coated with a carbon film, and dried using a special sample rod Put it into the sample chamber, pump the vacuum, adjust the appropriate resolution and focus, choose the appropriate exposure time, and take the image.

[0053] It was found that the obtained sample has a one-dimensional nanostructure with a diameter of 10-20 nanometers and a length of hundreds of nanometers or even several micrometers, such as figure 1 shown. In addition to nanofibers, there is less random deposition, in...

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Abstract

The invention provides a method for preparing manganese-doped titanium dioxide nanofiber materials, which belongs to the technical field of photocatalytic materials and has high photocatalytic degradation efficiency for organic pollutants in the environment. The preparation method includes: dispersing amphiphilic cationic short peptides in water, ultrasonic dispersion, adjusting the pH value of the solution, and leaving it at room temperature for more than a week to obtain a short peptide self-assembly solution; adding titanium dioxide precursor and potassium permanganate solution and manganese nitrate solution were added to the amphiphilic short peptide self-assembly solution in sequence, vortexed and mixed, and after reaction at room temperature, centrifuged to obtain a gray-brown precipitate; the gray-brown precipitate was washed and heated to remove the short peptide template to obtain Manganese-doped titanium dioxide nanofiber materials. The invention can be used to prepare manganese-doped titanium dioxide nanofiber materials.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a preparation method of a manganese-doped titanium dioxide nanofiber material. Background technique [0002] Titanium dioxide has the characteristics of non-toxicity, low cost, high activity, resistance to ultraviolet radiation, resistance to strong oxidants, and acid and alkali resistance. application prospects. However, the inherent bandgap of titanium oxide is too wide (the bandgap width of the anatase phase is 3.0eV, and the bandgap width of the rutile phase is 3.2eV), so that it can only be absorbed by ultraviolet light with a wavelength less than 387nm (the proportion of solar light less than 5%) excitation, but not sensitive to visible light accounting for more than 50%. Too low light utilization rate seriously limits the application effect of titanium oxide. For this reason, scientific researchers have carried out a lot of research work to adjust the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/30
CPCC02F1/30B01J31/38C02F2305/10C02F2101/308B01J35/58B01J35/39
Inventor 王生杰徐海杜明轩张董秀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)