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One-step method for preparing hierarchical mesoporous-porous TiO2/g-C3N4 nanofiber photocatalytic material

A technology of photocatalytic materials and nanofibers, applied in the field of photocatalytic materials, to achieve the effects of large specific surface area, small diameter of product fibers, and low cost

Pending Publication Date: 2020-06-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, lowering g-C 3 N 4 Photogenerated carrier recombination rate, improving the spectral response range is still a great challenge

Method used

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  • One-step method for preparing hierarchical mesoporous-porous TiO2/g-C3N4 nanofiber photocatalytic material
  • One-step method for preparing hierarchical mesoporous-porous TiO2/g-C3N4 nanofiber photocatalytic material
  • One-step method for preparing hierarchical mesoporous-porous TiO2/g-C3N4 nanofiber photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Add N,N-dimethylformamide and glacial acetic acid in sequence to absolute ethanol at a volume ratio of 4:3:1, and mix well to obtain solution A;

[0032] 2) Add urea with a mass ratio of 2.5% to solution A to obtain solution B after complete dissolution;

[0033] 3) Add polyvinylpyrrolidone with a mass ratio of 5% to solution B, and stir to obtain solution C;

[0034] 4) Add tetrabutyl titanate solution with a volume ratio of 6.25% to solution C, and stir to obtain mixed solution D;

[0035] 5) Add liquid paraffin with a volume ratio of 9% to solution D, and stir for more than 24 hours to obtain solution E;

[0036] 6) Put solution D into a 5mL syringe, install the syringe on the electrospinning device, conduct electrospinning at a voltage of 18KV, a solution supply rate of 1mL / h, and a receiving distance of 20cm, and collect the product with a stainless steel plate;

[0037] 7) After the product is dried, place it in a crucible with a lid and bake it at 550°C for ...

Embodiment 2

[0039] 1) Add N,N-dimethylformamide and glacial acetic acid in sequence to absolute ethanol at a volume ratio of 8:7:1, and mix well to obtain solution A;

[0040] 2) Add urea with a mass ratio of 3.75% to solution A to obtain solution B after complete dissolution;

[0041] 3) Add polyvinylpyrrolidone with a mass ratio of 7.5% to solution B, and stir to obtain solution C;

[0042] 4) Add tetrabutyl titanate solution with a volume ratio of 18.75% to solution C, and stir to obtain mixed solution D;

[0043] 5) Add liquid paraffin with a volume ratio of 15% to solution D, and stir for more than 24 hours to obtain solution E;

[0044] 6) Put solution D into a 5mL syringe, install the syringe on the electrospinning device, conduct electrospinning at a voltage of 18KV, a solution supply rate of 1mL / h, and a receiving distance of 20cm, and collect the product with a stainless steel plate;

[0045] 7) After the product is dried, place it in a crucible with a lid and bake it at 550°C f...

Embodiment 3

[0047] 1) Add N,N-dimethylformamide and glacial acetic acid in sequence to absolute ethanol at a volume ratio of 7:7:2, and mix well to obtain solution A;

[0048] 2) Add urea with a mass ratio of 5% to solution A to obtain solution B after complete dissolution;

[0049] 3) Add polyvinylpyrrolidone with a mass ratio of 8.75% to solution B, and stir to obtain solution C;

[0050] 4) Add tetrabutyl titanate solution with a volume ratio of 31.25% to solution C, and mix well to obtain mixed solution D;

[0051] 5) Add liquid paraffin with a volume ratio of 20% to solution D, and stir for more than 24 hours to obtain solution E;

[0052] 6) Put solution D into a 5mL syringe, install the syringe on the electrospinning device, conduct electrospinning at a voltage of 18KV, a solution supply rate of 1mL / h, and a receiving distance of 20cm, and collect the product with a stainless steel plate;

[0053] 7) After the product is dried, place it in a crucible with a lid and bake it at 550...

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Abstract

A one-step method for preparing a hierarchical mesoporous-porous TiO2 / g-C3N4 nanofiber photocatalytic material comprises the following steps: sequentially adding N,N-dimethylformamide and glacial acetic acid into absolute ethyl alcohol, and uniformly stirring; adding urea, and completely dissolving; adding polyvinylpyrrolidone, and completely dissolving; adding tetrabutyl titanate, and completelydissolving; adding liquid paraffin, and stirring for 24 h or above; putting the obtained mixture into an injector, carrying out electrostatic spinning under a certain condition, and collecting the obtained spinning product by using a stainless steel disc; and drying the spinning product, and roasting the dried spinning product in a crucible with a cover in an air atmosphere at 550 DEG C for 4 h. The method is simple and rapid, low in cost, wide in spectral response range and low in broad-spectrum carrier recombination rate, the photo-induced electron-hole recombination rate is reduced througha one-dimensional structure, the light scattering effect is enhanced through a macroporous structure, the light capturing capacity is improved, and diffusion of reactant molecules is promoted. The mesoporous structure increases the specific surface area, and provides more active sites, so the product is applied to photocatalytic cracking of water to produce hydrogen.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to one-step preparation of hierarchical mesoporous-porous TiO 2 / g -C 3 N 4 Nanofiber photocatalytic materials. Background technique [0002] With the continuous development of society, the problem of energy shortage is becoming more and more serious. In order to solve this problem, it is imminent to find clean energy that can replace fossil fuels. Hydrogen has a high combustion calorific value, easy storage, and zero pollution, and is considered an ideal substitute for fossil fuels. It has immeasurable prospects in resolving the global energy and environmental crisis. The traditional hydrogen production methods mainly include water gas hydrogen production, petroleum thermal cracking synthesis gas and natural gas hydrogen production, electrolytic water production, etc. These methods generally have the disadvantages of many by-products and high processing costs. Therefor...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/06B01J35/10C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277B01J35/39B01J35/58B01J35/61Y02E60/36
Inventor 杨艳玲邹鑫鑫陈华军锁国权陈志刚朱建锋冯雷叶晓慧张荔侯小江毕雅欣和茹梅孙瑜
Owner SHAANXI UNIV OF SCI & TECH
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