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Method for in-situ preparation of g-C3N4-TiO2 nano heterojunction photocatalyst film

A photocatalytic film, g-c3n4-tio2 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of poor film stability, difficult recycling, complex composite methods, etc. , to achieve the effect of stable structure, uniform distribution and favorable mass transfer

Inactive Publication Date: 2017-09-15
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects and deficiencies of the existing preparation technology, the present invention provides an in-situ preparation of g-C 3 N 4 -TiO 2 The method of nano-heterojunction photocatalytic thin film overcomes the problem that traditional powder photocatalytic materials are difficult to recycle, and the existing composite method is complex and the film stability is poor.

Method used

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  • Method for in-situ preparation of g-C3N4-TiO2 nano heterojunction photocatalyst film
  • Method for in-situ preparation of g-C3N4-TiO2 nano heterojunction photocatalyst film
  • Method for in-situ preparation of g-C3N4-TiO2 nano heterojunction photocatalyst film

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Embodiment 1

[0035] At room temperature, 0.5g NaOH, 0.7g KOH, 25mL ethylene glycol and 25mL deionized water were stirred for 1 hour to obtain a mixed solution, which was transferred to a 100mL polytetrafluoroethylene-lined reactor, and titanium The slice (21mm×42mm) was immersed in the above reaction solution, and kept at 160°C for 72h. After the reaction solution was cooled to room temperature, the titanium sheet was taken out, rinsed repeatedly with ethanol and water, then acidified in 0.5 wt% hydrochloric acid aqueous solution for 24 hours, and TiO2 was obtained after drying. 2 Precursor nanofilms. TiO 2 Precursor nano film and 0.5g melamine were placed in a crucible together, then placed in a microwave muffle furnace, heated to 550°C at a heating rate of 30°C / min, kept for 0.1h, and then naturally cooled to room temperature to obtain g-C 3 N 4 -TiO 2 Nano-heterojunction photocatalytic composite thin film. Its UV-Vis absorption spectrum and XRD pattern are shown in figure 1 and ...

Embodiment 2

[0037] At room temperature, 1.0g NaOH, 1.4g KOH, 25mL glycerin and 25mL deionized water were stirred for 1h to obtain a mixed solution, which was transferred to a 100mL polytetrafluoroethylene-lined reactor, and the titanium The slice (21mm×42mm) was immersed in the above reaction solution, and kept at 180°C for 12h. After the reaction solution was cooled to room temperature, the titanium sheet was taken out, rinsed repeatedly with ethanol and water, and then acidified in 0.5wt% nitric acid aqueous solution for 24 hours, and TiO2 was obtained after drying. 2 Precursor nanofilms. TiO 2 Precursor nano film and 2.0g melamine were placed in a crucible together, then placed in a microwave muffle furnace, heated to 600°C at a heating rate of 20°C / min and kept for 0.25h, and then naturally cooled to room temperature to obtain g-C 3 N 4 -TiO 2 Nano-heterojunction photocatalytic composite thin film. It looks like Figure 4 As shown, the composite film has a pore structure, and th...

Embodiment 3

[0039] At room temperature, 0.5g NaOH, 2.1g KOH, 25mL ethylene glycol and 25mL deionized water were stirred for 1 hour to obtain a mixed solution, which was transferred to a 100mL polytetrafluoroethylene-lined reactor, and titanium The slice (21mm×42mm) was immersed in the above reaction solution, and kept at 220°C for 3h. After the reaction solution was cooled to room temperature, the titanium sheet was taken out, rinsed repeatedly with ethanol and water, then acidified in 0.3 wt% aqueous sulfuric acid solution for 24 hours, and TiO2 was obtained after drying. 2 Precursor nanofilms. TiO 2 Precursor nano film and 3.0g melamine were placed in a crucible together, then placed in a microwave muffle furnace, heated to 650°C at a heating rate of 15°C / min, kept for 0.5h, and then naturally cooled to room temperature to obtain g-C 3 N 4 -TiO 2 Nano-heterojunction photocatalytic composite thin film. It looks like Figure 5 As shown, the composite film has a pore structure, and t...

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Abstract

The invention discloses a method for in-situ preparation of a g-C3N4-TiO2 nano heterojunction photocatalyst film. The method comprises the following steps: taking a titanium sheet as a substrate, placing the titanium sheet in a mixed alkaline solution, carrying out solvothermal reaction, and then carrying out acidizing to obtain a TiO2 precursor nano film; then placing melamine and the TiO2 precursor nano film in a crucible together and carrying out microwave treatment at high temperature so as to obtain the g-C3N4-TiO2 nano heterojunction photocatalyst film in an in-situ preparation manner. The disclosed preparation method is simple and effective, preparation of g-C3N4 by high-temperature thermal polymerization of the melamine and high-temperature crystallization of a TiO2 precursor are combined, g-C3N4 grows on the surface of a TiO2 film in situ, and the obtained g-C3N4-TiO2 nano heterojunction photocatalyst composite film is stable in structure, uniform in surface, good in reusability and high in visible light catalysis efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, in particular to an in-situ preparation of g-C 3 N 4 -TiO 2 A method for nanoheterojunction photocatalytic thin films. Background technique [0002] As one of the best ways to solve energy and environmental problems, semiconductor photocatalysis technology can not only realize the conversion of solar energy into chemical energy, but also effectively degrade harmful substances in the environment. Cleaning and other fields show good application prospects. The core issue of this technology is the development of efficient, stable and cheap photocatalysts. Most semiconductor photocatalysts are limited by their energy band structure (Eg>3.0eV, such as TiO 2 , ZnO, ZnS, SrTiO 3 , NaTaO 3 etc.), can only absorb ultraviolet light in sunlight (accounting for only about 4% of the energy of sunlight on the earth's surface), but cannot make full use of visible light in sunlight (ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/06
CPCB01J27/24B01J35/59B01J35/39
Inventor 樊君潘超刘恩周胡晓云苗慧张德恺樊安
Owner NORTHWEST UNIV(CN)
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