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Preparation method of bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst

A graphite phase carbon nitride and photocatalyst technology, applied in the field of environmental restoration, can solve the problems of low apparent charge separation efficiency, charge carrier recombination hindering performance, industrial application, and application field limitations, etc., and achieve visible light response capability Enhance and improve photocatalytic performance, beneficial to the effect of light absorption

Pending Publication Date: 2021-03-09
YANGZHOU UNIV
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Problems solved by technology

Graphite phase carbon nitride is non-toxic and harmless, with low preparation cost and good chemical stability and thermodynamic stability. Poor; bismuth vanadate is an environmentally friendly metal oxide with a narrow energy band width. It is a typical oxidation photocatalyst with strong photogenerated hole oxidation ability but poor photogenerated electron reduction ability.
Limited by the mismatch of the redox ability of the photogenerated electron holes of the two, the above two photocatalysts often have low apparent charge separation efficiency and low reactivity, and their application fields are limited.
[0003] Although the single graphitic carbon nitride and single bismuth vanadate photocatalytic degradation technologies can show photocatalytic activity driven by visible light, their low separation efficiency and fast charge carrier recombination hinder their further performance. and industrial applications
In order to overcome the defects of low separation efficiency of single graphite phase carbon nitride and bismuth vanadate and easy recombination of photogenerated carriers, the construction of graphite phase carbon nitride / bismuth vanadate composite material can theoretically not only improve the reaction efficiency, but also expand the application field, driving the oxidative degradation of organic pollutants and photocatalytic CO 2 restore

Method used

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  • Preparation method of bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst
  • Preparation method of bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst
  • Preparation method of bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst

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preparation example Construction

[0021] The preparation method of bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst of the present invention, its steps are:

[0022] Step 1: Add 2~5g of graphite phase carbon nitride into 20mL of 2~8mol / L acetic acid, stir for 30~90min; ultrasonic for 5~30min; obtain solution A;

[0023] Second step: join bismuth chloride and sodium metavanadate with molar ratio 1:1 in the above-mentioned solution A, control graphite phase carbon nitride and bismuth vanadate mass ratio 1:1~4:1; Regulate solution pH as 5-7; heat the mixed solution in an oven at 160-200° C. for 8-20 hours; centrifuge and wash the reaction solution, and dry to obtain bismuth vanadate-doped graphite-phase carbon nitride nanosheets.

[0024] The environmental remediation material of the present invention is used for organic wastewater treatment and CO 2 The recovery method includes the following steps:

[0025] (1) Photocatalytic environmental restoration materials are added to organic ...

Embodiment 1

[0029] Add 2g of graphite phase carbon nitride to 20mL 4mol / L acetic acid, stir for 90min; sonicate for 30min to obtain solution A; add bismuth chloride and sodium metavanadate with a molar ratio of 1:1 into solution A to control the graphite phase The mass ratio of carbon nitride and bismuth vanadate is 4:1; the pH of the solution is adjusted to 5 with 2mol / L sodium hydroxide; the mixed solution is transferred to a polytetrafluoroethylene reactor and heated in an oven at 190°C for 12h; Centrifuge at a speed of 1 min for 5 min, and repeat 3 times; wash the precipitate 3 times with deionized water and absolute ethanol, and dry overnight at 60°C to obtain bismuth vanadate-doped graphite-phase carbon nitride nanosheets. Its scanning electron microscope picture is as figure 1 As shown, UTCN has a typical hierarchical structure, BiVO 4 Stacked block structure, UTCN / BiVO 4 Composites retain UTCN and BiVO 4 The structure of BiVO 4 Firmly anchored on UTCN. Its high magnification ...

Embodiment 2

[0031] Add 2g of graphite phase carbon nitride to 20mL 4mol / L acetic acid, stir for 90min; sonicate for 30min to obtain solution A; add bismuth chloride and sodium metavanadate with a molar ratio of 1:1 into solution A to control the graphite phase The mass ratio of carbon nitride and bismuth vanadate is 4:1; the pH of the solution is adjusted to 5 with 2mol / L sodium hydroxide; the mixed solution is transferred to a polytetrafluoroethylene reactor and heated in an oven at 190°C for 12h; Centrifuge at a speed of 1 min for 5 min, and repeat 3 times; wash the precipitate 3 times with deionized water and absolute ethanol, and dry overnight at 60°C to obtain bismuth vanadate-doped graphite-phase carbon nitride nanosheets. Its UV-Vis diffuse reflectance spectrum is as follows image 3 As shown, the absorption wavelength of UTCN is around 420nm, and the BiVO 4 It has strong absorption in the visible light region, by adding BiVO 4 Introduce to UTCN to build UTCN / BiVO 4 Composite ma...

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Abstract

The invention discloses a preparation method of a bismuth vanadate doped graphite phase carbon nitride nanosheet photocatalyst. The mehod comprises the following steps: adding graphite phase carbon nitride into an acetic acid solution, stirring, and carrying out ultrasonic treatment; adding bismuth chloride and sodium metavanadate into the solution; adjusting the pH value of the solution to 5-7; heating the mixed solution at 160-200 DEG C to react for 8-20 hours; and centrifugally separating, washing, and drying to obtain the catalyst. According to the invention, according to the characteristics that graphite-phase carbon nitride is non-toxic, easy to prepare, stable in thermodynamic and chemical properties, high in photocatalytic reducibility, narrow in bismuth vanadate band gap width, high in photocatalytic oxidation, capable of responding to visible light and having energy level difference, and the like, a bismuth vanadate doped graphite-phase carbon nitride nano composite materialis constructed, wherein the photon-generated carrier separation efficiency is remarkably improved, the recombination rate is greatly reduced, the response range of the material to visible light is further widened, and the oxidation-reduction capability is enhanced, so that the photocatalytic performance is further improved, and the composite material can be used for removing organic pollutants inthe environment and reducing CO2.

Description

technical field [0001] The invention relates to a preparation method of a bismuth vanadate-doped graphite-phase carbon nitride nanosheet photocatalyst, which belongs to the field of environmental restoration. Background technique [0002] Environmental pollution and energy crisis have become one of the important challenges facing mankind in the 21st century. At present, there is an urgent need to restore the environment and develop efficient, clean, safe, and environmentally friendly secondary energy, so as to realize the sustainable development of the environment, energy, and human production and life. Graphite phase carbon nitride is non-toxic and harmless, with low preparation cost and good chemical stability and thermodynamic stability. Poor; bismuth vanadate is an environmentally friendly metal oxide with a narrow energy band width. It is a typical oxidation photocatalyst with strong photogenerated hole oxidation ability but poor photogenerated electron reduction abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C01B32/40C07C1/20C07C9/04C02F101/38
CPCB01J27/24C02F1/30C01B32/40C07C1/20C02F2305/10C02F2101/38B01J35/39B01J35/61C07C9/04
Inventor 王小治周港华孟莉蓉王圣森侯建华尹微琴
Owner YANGZHOU UNIV
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