A rare earth/carbon co-doped flexible tio 2 Nanofiber membrane and preparation method thereof

A nanofiber membrane and co-doping technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve complex process, high cost, and poor product performance and other problems, to achieve the effect of simple preparation process, low cost and high yield

Active Publication Date: 2019-10-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of relatively complicated process, high cost and poor product performance in the prior art, and provide a rare earth / carbon co-doped with simple production process, low cost, good photocatalytic performance and flexibility of the product Flexible TiO 2 Nanofiber membrane and preparation method thereof

Method used

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  • A rare earth/carbon co-doped flexible tio <sub>2</sub> Nanofiber membrane and preparation method thereof
  • A rare earth/carbon co-doped flexible tio <sub>2</sub> Nanofiber membrane and preparation method thereof
  • A rare earth/carbon co-doped flexible tio <sub>2</sub> Nanofiber membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] A rare earth / carbon co-doped flexible TiO 2 The preparation method of nanofibrous film, the steps are as follows:

[0036] (1) Dissolve titanium source titanium isopropoxide and rare earth metal salt lanthanum nitrate hexahydrate in solvent ethanol and stir for 30 minutes, then add carbon source graphene and nonionic surfactant polyethylene oxide-polypropylene oxide- The polyethylene oxide triblock copolymer was stirred for 90min and mixed uniformly to obtain a precursor solution, wherein the molar ratio of titanium source, rare earth metal salt, solvent, carbon source and nonionic surfactant in the solution was 1:0.001:100: 0.001:0.25;

[0037] (2) Prepare the precursor fiber film by electrospinning the above precursor solution, apply a constant temperature thermal field of 50°C in the spinning interval during electrospinning and control the temperature of the metal drum receiving device to 0°C; The parameters are: relative humidity 20%, perfusion speed 15mL / h, volta...

Embodiment 2

[0044] A rare earth / carbon co-doped flexible TiO 2 The preparation method of nanofibrous film, the steps are as follows:

[0045] (1) Dissolve titanium source tetrabutyl titanate and rare earth metal salt lanthanum acetate in solvent ethylene glycol and stir for 150 minutes, then add carbon source single-walled carbon nanotubes and nonionic surfactant polyoxyethylene polyoxypropylene successively and stir Mix evenly for 10 minutes to prepare a precursor solution, wherein the molar ratio of titanium source, rare earth metal salt, solvent, carbon source and nonionic surfactant in the solution is 1:0.1:10:0.1:0.05;

[0046] (2) Prepare the precursor fiber film by electrospinning the above precursor solution, apply a constant temperature thermal field of 100°C in the spinning interval during electrospinning and control the temperature of the metal plate receiving device to -10°C; The parameters of silk are: relative humidity 70%, infusion speed 0.1mL / h, voltage 60kV, distance bet...

Embodiment 3

[0050] A rare earth / carbon co-doped flexible TiO 2 The preparation method of nanofibrous film, the steps are as follows:

[0051] (1) Stir the titanium source titanium tetrachloride and the rare earth metal salt lanthanum chloride heptahydrate in the solvent ethylene glycol for 90 minutes, then add the carbon source multi-walled carbon nanotubes and the nonionic surfactant glycerol polyoxyethylene successively The polyoxypropylene block copolymer was stirred for 50 minutes and mixed evenly to obtain a precursor solution, wherein the molar ratio of titanium source, rare earth metal salt, solvent, carbon source and nonionic surfactant in the solution was 1:0.05:55:0.05: 0.15;

[0052] (2) Prepare the precursor fiber film by electrospinning the above precursor solution, apply a constant temperature thermal field of 75°C in the spinning interval and control the temperature of the metal drum receiving device to -5°C during electrospinning; The parameters of silk are: relative hum...

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Abstract

The invention relates to a rare earth / carbon co-doped flexible TiO2 nanofiber membrane and a preparation method thereof. The rare earth / carbon co-doped flexible TiO2 nanofiber membrane comprises steps as follows: firstly, a precursor solution is prepared from a titanium source, rare earth metals, a carbon source, a nonionic surfactant and a solvent; a precursor fibrous membrane is obtained through electrostatic spinning; during electrostatic spinning, a constant-temperature thermal field at the temperature of 50-100 DEG C is applied at the spinning interval, and the temperature of a receiving device is controlled at subzero 10 to 0 DEG C; finally, the rare earth / carbon co-doped flexible TiO2 nanofiber membrane is obtained through calcination at the air atmosphere. The finally prepared product has the softness of 10-50 mN and the tensile breaking strength of 3-5 MPa, and the absorbed light absorbing range is expanded to 550-700 nm. According to the preparation method, polymer is not required to be added, ageing and aftertreatment are not required, the process is simple, the cost is low, and the product has good tensile breaking strength, flexibility and visible light catalysis performance.

Description

technical field [0001] The invention belongs to the field of new materials and relates to a rare earth / carbon co-doped flexible TiO 2 Nanofibrous membrane and method for its preparation. Background technique [0002] Titanium dioxide (TiO 2 ) One-dimensional nanomaterials have aroused widespread interest in photocatalytic hydrogen production, volatile organic compounds (VOCs) in industry, and degradation of VOCs indoors and vehicles due to their stable photocatalytic properties, low price, and no biological toxicity. focus on. However, as a widely used photocatalytic material, it has the following main problems: 1) TiO 2 It has a wide band gap (Eg=3.0-3.2eV), can only be excited by ultraviolet light with a wavelength below 400 nanometers, and has a low utilization rate of solar energy. 2) Photogenerated electron-hole pairs are easy to recombine, resulting in low photon utilization efficiency, thereby reducing the catalytic activity of the material. 3) Most one-dimension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/06B01J37/03B01J37/08
CPCB01J23/10B01J35/0013B01J35/002B01J35/004B01J35/006B01J35/06B01J37/033B01J37/082
Inventor 丁彬崔福海宋骏武晓会张猛俞建勇
Owner DONGHUA UNIV
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