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Delta-MnO2/SiO2 composite nanofiber with light-driven thermal degradation function and preparation and application thereof

A technology of composite nanofibers and nanofibers, which can be used in fiber processing, metal/metal oxide/metal hydroxide catalysts, filament/wire forming, etc. Material application, secondary pollution and other issues, to achieve good photothermal conversion performance, significant light-driven thermocatalytic degradation function, and temperature reduction.

Pending Publication Date: 2019-12-24
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the adsorption material has a good treatment ability for VOCs, it has the disadvantages of adsorption saturation and easy to cause secondary pollution; photocatalytic materials are often only able to use 5% of the ultraviolet light in sunlight due to the problem of the band gap. The problem of low sunlight utilization rate and catalytic efficiency; and catalytic oxidation technology is a method that can completely oxidize and decompose VOCs into CO at lower temperatures 2 and H 2 O, a technology with the advantages of flameless combustion, good safety, less restrictions on VOCs concentration, and lower ignition temperature, but this technology still requires a large amount of heat energy from the outside, which greatly limits the application of thermocatalytic materials

Method used

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  • Delta-MnO2/SiO2 composite nanofiber with light-driven thermal degradation function and preparation and application thereof
  • Delta-MnO2/SiO2 composite nanofiber with light-driven thermal degradation function and preparation and application thereof
  • Delta-MnO2/SiO2 composite nanofiber with light-driven thermal degradation function and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1. Preparation of SiO 2 nanofiber membrane

[0050] (1) Using TEOS, phosphoric acid and water as raw materials, the molar ratio of TEOS, phosphoric acid and water is 1:0.01:10, stirring at 25°C for 1 hour to obtain spinning solution A;

[0051] (2) Using PVA and water as raw materials, 1 g of PVA was dissolved in 10 ml of deionized water, and stirred at 60° C. for 3 hours to obtain spinning solution B;

[0052] (3) Take 1 g of spinning solution A, add it dropwise to spinning solution B, control the mass ratio of solutions A and B to be 1:1, and stir for 6 hours at 25°C;

[0053] (4) An electrospinning machine with a single propulsion pump and a single moving platform is adopted, and the moving speed of the platform is 60mm / min; the electrospinning voltage is +18Kv, and the flow rate is controlled to be 0.02ml / min, and the drum is used as the collecting device and the rotating speed is 500r / min, the distance between the electrospinning nozzle and the receiving dru...

Embodiment 2

[0061] Get the δ-MnO prepared in Example 1 2 Particles, SiO 2 Nanofibers and δ-MnO 2 / SiO 2 Composite nanofibers were tested for photothermal conversion and static photothermal catalysis and dynamic photothermal catalysis experiments of toluene.

[0062] 1. Photothermal conversion performance test

[0063] Using a 300w xenon lamp to simulate sunlight, the cut 2cm×2cm δ-MnO 2 / SiO 2 Composite nanofibers, SiO 2 Nanofibers and δ-MnO 2 The particles were placed directly under the xenon lamp light source, with a distance of 15 cm, and at intervals of 1 min, the temperature under the irradiation of the xenon lamp was measured by a thermocouple.

[0064] Such as Figure 6 As shown in a, δ-MnO 2 / SiO 2 The composite nanofiber is irradiated by a 300w xenon lamp to simulate full-band sunlight, and the temperature rises rapidly to about 225°C within 5 minutes.

[0065] Such as Figure 6 b UV-Vis diffuse reflectance curve, δ-MnO 2 / SiO 2 Composite nanofibers have a certain d...

Embodiment 3

[0079] Step 1. Preparation of SiO 2 nanofiber membrane

[0080] (1) Using TEOS, phosphoric acid and water as raw materials, the molar ratio of TEOS, phosphoric acid and water is 1 / 0.01 / 10, stirring at 25°C for 3 hours to obtain spinning solution A;

[0081] (2) Using PVA and water as raw materials, 1.2g of PVA was dissolved in 10ml of deionized water, and stirred at 60°C for 6h to obtain spinning solution B;

[0082] (3) Take 1 g of spinning solution A, add it dropwise to spinning solution B, control the mass ratio of solutions A and B to be 1:1.5, and stir for 8 hours at 25°C;

[0083] (4) An electrospinning machine with a single propulsion pump and a single moving platform is adopted, and the moving speed of the platform is 60mm / min; the electrospinning voltage is +15Kv, and the flow rate is controlled to be 0.04ml / min, and the drum is used as the collecting device and the rotating speed is 500r / min, the distance between the electrospinning nozzle and the receiving drum is...

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Abstract

The invention belongs to the field of environmental nano materials, and particularly relates to delta-MnO2 / SiO2 composite nanofiber with a light-driven thermal degradation function and preparation andapplication thereof. Surface of SiO2 nanofiber serving as matrix is loaded with delta-MnO2 particles, forming the delta-MnO2 / SiO2 composite nanofiber with the light-driven thermal degradation function. The preparation comprises the steps: placing the SiO2 nanofiber into a reaction system taking a permanganate solution and alcohol as raw materials to allow for in-situ deposition, and calcining toobtain the SiO2 composite nanofiber. The composite nanofiber has light-driven thermocatalytic degradation performance, allows for efficient and rapid degradation of volatile organic matters, eliminates the pollution of the volatile organic matters in the environment and is beneficial to environmental remediation, the preparation method is simple and easy to perform, secondary pollution is avoided,the raw materials are cheap and easily available, the conditions are mild, equipment and environmental requirements are low, and the composite nanofiber has a good application prospect.

Description

technical field [0001] The invention belongs to the field of environmental nanomaterials, in particular to a δ-MnO with light-driven thermal degradation function 2 / SiO 2 Composite nanofibers and their preparation and applications. Background technique [0002] In recent years, volatile organic pollutants (VOC S ), such as toluene, benzene, acetaldehyde, etc., pose a serious threat to human health and even cause cancer. At present, domestic and foreign treatment technologies for volatile organic compounds (VOCs) mainly include: adsorption, photocatalytic technology, and catalytic oxidation technology. Although the adsorption material has a good treatment ability for VOCs, it has the disadvantages of adsorption saturation and easy to cause secondary pollution; photocatalytic materials are often only able to use 5% of the ultraviolet light in sunlight due to the problem of the band gap. The problem of low sunlight utilization rate and catalytic efficiency; and catalytic ox...

Claims

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Application Information

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IPC IPC(8): D01F9/08D06M11/48D01D5/00B01J35/06B01J35/00B01J23/34
CPCD01F9/08D06M11/485D01D5/003D01D5/0061D01D5/0092B01J23/34B01J35/39B01J35/58
Inventor 徐合柯勤飞苏佳飞江依静应婷
Owner SHANGHAI NORMAL UNIVERSITY
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