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Method for preparing three-layer g-C3N4/TiO2 coaxial composite nanometer structure by vacuum assisting

A composite nanostructure, vacuum-assisted technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., to achieve the effect of improving photocatalytic efficiency

Active Publication Date: 2019-01-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no information about 1D TiO prepared by hydrothermal method 2 Using nanotubes as templates and small molecule cyanamide as precursors as raw materials, confinement preparation of g-C 3 N 4 / TiO 2 Research and Public Reports of Coaxial Composite Nanomaterials

Method used

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  • Method for preparing three-layer g-C3N4/TiO2 coaxial composite nanometer structure by vacuum assisting
  • Method for preparing three-layer g-C3N4/TiO2 coaxial composite nanometer structure by vacuum assisting
  • Method for preparing three-layer g-C3N4/TiO2 coaxial composite nanometer structure by vacuum assisting

Examples

Experimental program
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Effect test

Embodiment 1

[0028] At room temperature, configure 50mL with a concentration of 13mol L -1Add 1.0g of P25 and stir well for 2h to form a uniform white suspension. The white suspension was transferred to a polytetrafluoroethylene hydrothermal kettle with a volume of 100 mL, packaged and placed in a blast drying oven, and the temperature was set at 150° C. for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and the white precipitate in the reaction kettle was taken out, and washed with deionized water until neutral. Place the white paste in a vacuum oven at 80°C for 6 hours, and then grind it to powder with agate for use. Add 1.0g of this powder to the pre-configured 750mL concentration of 0.1mol L -1 In dilute hydrochloric acid, fully stir for 60 minutes and then let stand for 60 minutes. Then, the supernatant was discarded, and the white precipitate was washed to neutral with deionized water. The white paste was placed in a vacuum oven at 80° C....

Embodiment 2

[0031] At room temperature, configure 50mL with a concentration of 13mol L -1 Add 1.0g of P25 and stir well for 2h to form a uniform white suspension. The white suspension was transferred to a polytetrafluoroethylene hydrothermal kettle with a volume of 100 mL, packaged and placed in a blast drying oven, and the temperature was set at 150° C. for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and the white precipitate in the reaction kettle was taken out, and washed with deionized water until neutral. Place the white paste in a vacuum oven at 80°C for 6 hours, and then grind it to powder with agate for use. Add 1.0g of this powder to the pre-configured 750mL concentration of 0.1mol L -1 In dilute hydrochloric acid, fully stir for 60 minutes and then let stand for 60 minutes. Then, the supernatant was discarded, and the white precipitate was washed to neutral with deionized water. The white paste was placed in a vacuum oven at 80° C...

Embodiment 3

[0034] At room temperature, configure 50mL with a concentration of 13mol L -1 Add 1.0g of P25 and stir well for 2h to form a uniform white suspension. The white suspension was transferred to a polytetrafluoroethylene hydrothermal kettle with a volume of 100 mL, packaged and placed in a blast drying oven, and the temperature was set at 150° C. for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and the white precipitate in the reaction kettle was taken out, and washed with deionized water until neutral. Place the white paste in a vacuum oven at 80°C for 6 hours, and then grind it to powder with agate for use. Add 1.0g of this powder to the pre-configured 750mL concentration of 0.1mol L -1 In dilute hydrochloric acid, fully stir for 60 minutes and then let stand for 60 minutes. Then, the supernatant was discarded, and the white precipitate was washed to neutral with deionized water. The white paste was placed in a vacuum oven at 80° C...

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Abstract

The invention relates to preparation of a g-C3N4 / TiO2 coaxial nanorod with a three-layer structure by one-step heat polymerization using a titanate nanotube as a precursor. Graphite-like carbon nitride (g-C3N4), as a typical polymer semiconductor, has the 2.7eV forbidden bandwidth; organic pollutants can be directly degraded by the visible part of sunlight, and the huge potential is realized in the field of environment photocatalysis; however, the g-C3N4 prepared by heat polymerization generally has a poorer degree of crystallinity, the transmission rate of photon-generated carriers is slow, the quantum efficiency is low, and the photocatalysis degradation efficiency is poorer. The g-C3N4 / TiO2 coaxial nanorod has the advantages that because the energy band positions of g-C3N4 and TiO2 arematched, g-C3N4 can be used as a photosensitizer of TiO2, g-C3N4 is excited to produce electron-cavity pairs under the radiation by visible light, and electrons are transferred to TiO2 with lower conduction band electric potential; meanwhile, TiO2 is used as an electron trap of g-C3N4, the photocatalysis reduction reaction is initiated after the electrons are received, the separating effect of photo-generated charges is realized, and the photocatalysis activity of the g-C3N4 / TiO2 material is improved.

Description

technical field [0001] The invention relates to a vacuum-assisted preparation of three-layer g-C 3 N 4 / TiO 2 The method of coaxial composite nanostructures, more specifically, uses the hydrothermal method to prepare titanate nanotubes as a carrier, assists cyanamide to fill and adsorb on the inner and outer surfaces of nanotubes by means of vacuum, and through confined thermal polymerization reaction, one step Preparation of g-C with visible light response 3 N 4 / TiO 2 Heterojunction nanophotocatalysts. The technology belongs to the field of preparation of photocatalytic nanometer materials. Background technique [0002] In recent years, with the rapid economic development, the problem of environmental pollution has become increasingly serious. As an advanced oxidation technology (AOPs), the semiconductor photocatalytic process can effectively degrade harmful pollutants in the environment, and has attracted extensive attention from researchers. At present, semicondu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 石良曲晓飞杜芳林
Owner QINGDAO UNIV OF SCI & TECH