Method for improving photocatalytic performance of graphite phase carbon nitride

A phase carbon nitride light and catalytic performance technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problem of low dielectric properties, high resistivity, large surface active site migration resistance, etc. problems, to achieve the effect of improving electrical properties and improving utilization efficiency

Pending Publication Date: 2022-03-22
JINLIN MEDICAL COLLEGE
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Problems solved by technology

However, the ontological g-C 3 N 4 Visible light wavelength response is limited (less than 460nm), has low dielectric properties and high resistivity, resulting in limited utilization of visible light wavelengths in the solar spectrum, high recombination rate of photogenerated charge carriers High point migration resistance, low photocatalytic activity

Method used

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  • Method for improving photocatalytic performance of graphite phase carbon nitride
  • Method for improving photocatalytic performance of graphite phase carbon nitride
  • Method for improving photocatalytic performance of graphite phase carbon nitride

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: +2 valence and +4 valence molybdenum ion doping g-C 3 N 4 preparation of

[0037] 10 μL of 0.1 M MoCl 5Mix and dissolve 10 μmol of aqueous solution and 500 mg of dicyandiamide in 2 mL of deionized water, ultrasonically disperse evenly, stir magnetically at room temperature, the stirring speed is 400 rpm, and the stirring time is 2 h, then transfer the mixed solution to a porcelain boat and place it in a vacuum oven at 45 °C for drying A white powder solid is obtained. After the dried sample is fully ground, it is heated in an Ar atmosphere in a tube furnace, and the temperature is raised to 520°C at 5°C / min for 2 hours. After the sample is naturally cooled to room temperature, it is ground, washed, and dried. After that, the +2-valent and +4-valent molybdenum ions doped g-C 3 N 4 As for the photocatalyst, the mass fraction of molybdenum ions doped in the catalyst is 0.21wt.%.

Embodiment 2

[0038] Example 2: +2 valence and +4 valence molybdenum ion doping g-C 3 N 4 preparation of

[0039] 20 μL of 0.1 M MoCl 5 Mix and dissolve 20 μmol of aqueous solution and 500 mg of dicyandiamide in 2 mL of deionized water, disperse evenly by ultrasonic, stir magnetically at room temperature, the stirring speed is 400 rpm, and the stirring time is 2 h, then transfer the mixed solution to a porcelain boat and place it in a vacuum oven at 45 °C for drying A white powder solid is obtained. After the dried sample is fully ground, it is heated in an Ar atmosphere in a tube furnace, and the temperature is raised to 520°C at 5°C / min for 2 hours. After the sample is naturally cooled to room temperature, it is ground, washed, and dried. After that, the +2-valent and +4-valent molybdenum ions doped g-C 3 N 4 As for the photocatalyst, the mass fraction of molybdenum ions doped in the catalyst is 0.41wt.%.

Embodiment 3

[0040] Example 3: +2 valence and +4 valence molybdenum ion doping g-C 3 N 4 preparation of

[0041] Mix and dissolve 40 μL of 0.1M MoCl5 aqueous solution, 40 μmol, and 500 mg of dicyandiamide in 2 mL of deionized water, ultrasonically disperse evenly, stir magnetically at room temperature, the stirring speed is 400 rpm, and the stirring time is 2 h, and then transfer the mixed solution to a porcelain boat Place it in a vacuum oven at 45°C to obtain a white powder solid. After the dried sample is fully ground, it is heated in a tube furnace in an Ar atmosphere, and the temperature is raised to 520°C at 5°C / min for 2 hours, and then naturally cooled to room temperature. The samples were ground, washed with water, and dried to obtain +2-valent and +4-valent molybdenum ion-doped g-C 3 N 4 As for the photocatalyst, the mass fraction of molybdenum ions doped in the catalyst is 0.89wt.%.

[0042] Ontology g-C 3 N 4 Preparation process of photodoped g-C with +2 and +4 bivalent m...

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Abstract

The invention discloses a method for improving the photocatalytic performance of graphite-phase carbon nitride, which comprises the following steps: mixing a molybdenum precursor and a g-C3N4 precursor, adding the mixture into deionized water, fully stirring for 2 hours, and placing in a vacuum oven at 45 DEG C until the mixture is completely dried, and then carrying out a high-temperature calcination process to obtain the bivalent molybdenum ion doped g-C3N4 photocatalyst. The adding amount of the deionized water is 2mL; in the high-temperature calcination process, the heating rate is set to be 5 DEG C / min, the heat preservation temperature is 520 DEG C, and the heat preservation time is 2 hours; the mass fraction of the molybdenum element doped in the g-C3N4 matrix is adjusted by changing the amount of the added molybdenum precursor; when the amount of the molybdenum precursor is 10 [mu] mol, 20 [mu] mol and 40 [mu] mol, the mass fractions of the molybdenum element doped in the g-C3N4 matrix are 0.21 wt.%, 0.41 wt.% and 0.89 wt.% respectively; according to the method, the electrical property of g-C3N4 is optimized by doping the + 2-valence molybdenum ions and the + 4-valence molybdenum ions, and the method for improving the photocatalytic performance of g-C3N4, which is simple and convenient to operate and adjustable in photo-generated charge carrier separation and migration efficiency, is provided.

Description

technical field [0001] The invention relates to the technical field of semiconductor photocatalysis, in particular to a method for improving the photocatalytic performance of graphite-phase carbon nitride. Background technique [0002] Inspired by photosynthesis in nature, semiconductor photocatalysis technology can convert solar energy into chemical energy, and apply it in pollutant degradation, water splitting to produce hydrogen and oxygen, CO 2 Fields such as reduction and nitrogen fixation are of great significance for effectively solving environmental problems and producing renewable energy. Among them, the development of photocatalysts with low cost, visible light response and high energy conversion efficiency is the core issue of photocatalytic system research. [0003] Graphite carbon nitride (g-C 3 N 4 ) is a semiconductor photocatalyst composed of earth-abundant non-metallic elements and responding to visible light. Potential photocatalyst. However, the ontol...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C01B3/04B01D53/86B01D53/72
CPCB01J27/24C02F1/30C01B3/042B01D53/8668C02F2305/10C02F2101/308B01J35/33B01J35/39
Inventor 杨晓航王盼新贾若琨
Owner JINLIN MEDICAL COLLEGE
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