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A kind of bismuth vanadate/graphite phase carbon nitride composite material, its preparation method and application

A technology of graphitic carbon nitride and composite materials, applied in the field of photocatalysis, can solve the problems of performance attenuation restricting industrial application, etc., and achieve the effects of reducing fast charging and reorganization, avoiding agglomeration, and having high visible light responsiveness.

Active Publication Date: 2020-08-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to fabricate heterostructured systems with high surface coverage remains a great challenge
In addition, the performance attenuation of photocatalytic materials during recycling also restricts their industrial application.

Method used

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  • A kind of bismuth vanadate/graphite phase carbon nitride composite material, its preparation method and application
  • A kind of bismuth vanadate/graphite phase carbon nitride composite material, its preparation method and application
  • A kind of bismuth vanadate/graphite phase carbon nitride composite material, its preparation method and application

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Experimental program
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Embodiment 1

[0072] This embodiment provides a preparation method of bismuth vanadate / graphite phase carbon nitride composite material, and its specific preparation method is:

[0073] (1) Take bismuth nitrate as raw material, prepare the aqueous solution with bismuth ion concentration of 0.02mol / L, then add sodium oleate and stir evenly by sodium oleate: bismuth ion molar ratio is 1:0.8, obtains solution A;

[0074] (2) Using sodium vanadate as raw material, prepare an aqueous solution with a vanadium ion concentration of 0.02mol / L, then add g-C with a solution quality of 0.05%. 3 N 4 , after stirring evenly, solution B was obtained;

[0075] (3) under stirring state, solution A is joined in solution B, control bismuth: the vanadium molar ratio is 1:1, continues to stir 2h;

[0076] (4) Add the solution obtained in step (3) into a hydrothermal kettle, control the filling rate in the kettle to 60%, and react at 80° C. for 24 hours;

[0077] (5) After the reaction in step (4), the soluti...

Embodiment 2

[0089] The application of bismuth vanadate / graphitic carbon nitride composite material of the present invention in degrading methylene blue (MB) in waste water may further comprise the steps:

[0090] (1) Weigh 100mg of bismuth vanadate / graphitic carbon nitride composite material prepared, and add it to 100mL initial concentration c 0 5 mg / L of MB-containing wastewater, stirred for 1 h to reach adsorption equilibrium, and then placed in a photocatalytic reaction device.

[0091] (2) A 500W xenon lamp was used for the photocatalytic reaction, and the distance between the light source and the solution was 16cm. Measure the visible light absorption spectrum of reaction solution at t moment, according to the absorbance value of absorption peak peak value, in conjunction with standard curve, know the concentration c of MB in the solution at t moment, according to formula D=(c 0 -c) / c 0 ×100% to calculate the removal rate of MB.

[0092] Weigh respectively the bismuth vanadate / gr...

Embodiment 3

[0094] The material after the reaction in Example 2 was collected by centrifugation, washed with ethanol and deionized water, and then dried and regenerated. The process of photocatalytic degradation of MB in Example 2 was repeated with the regenerated material. Detected respectively the bismuth vanadate / graphitic carbon nitride composite material prepared in embodiment 1 and the bismuth vanadate nanosheet prepared in comparative example 1 to the removal rate of MB in the process of recycling 8 times, the results are respectively as follows Figure 8 , Figure 9 shown. Depend on Figure 7 As can be seen, cycle 8 times, the bismuth vanadate / graphitic carbon nitride composite material that embodiment 1 prepares does not significantly reduce the photocatalytic removal rate of MB, and the removal rate of the 8th, 50min still can reach 96.1% (decrease is less than 2 %), indicating that the composite material provided by the invention has good photocatalytic stability and good re...

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Abstract

The invention provides a bismuth vanadate / graphite phase carbon nitride composite material and its preparation method and use. The composite material includes bismuth vanadate nanosheets and graphite phase carbon nitride covering the surface thereof, bismuth vanadate and graphite. The mass ratio of phase carbon nitride is 1:0.01-0.30, and the thickness of graphite phase carbon nitride is 3-15nm; its preparation method: mix surfactant with an aqueous solution of specific bismuth ion concentration to obtain solution A; treat it with acid The final graphite phase carbon nitride is mixed with an aqueous solution of a specific vanadium ion concentration to obtain solution B; add solution A to solution B, and control the molar ratio of bismuth to vanadium to obtain a mixed solution; then perform a hydrothermal reaction to obtain bismuth vanadate / Graphite phase carbon nitride composite materials. The bismuth vanadate / graphite phase carbon nitride composite material has the advantages of high visible light responsiveness, high catalytic activity, and good cycle stability. Its preparation method is simple and easy to control, and it can be used to degrade pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a bismuth vanadate / graphite phase carbon nitride composite material, a preparation method and application thereof. Background technique [0002] Due to the ever-intensifying environmental and energy crises, the exploration of highly efficient photocatalyst materials has attracted increasing attention, which can directly utilize the abundant solar energy resources to drive multiple reactions. with TiO 2 Compared to monoclinic BiVO 4 The narrow band gap, the ability to respond to sunlight, and high stability have attracted much attention in the field of photocatalytic materials. But BiVO 4 The ability to absorb visible light is weak, and the effective migration speed of photogenerated electrons and holes is small due to the high recombination speed, which severely limits the BiVO 4 Practical applications of photocatalysts. [0003] The construction of heterostructured pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/30C02F101/36C02F101/38B01J35/00
CPCC02F1/30B01J27/24C02F2305/10C02F2101/30C02F2101/38C02F2101/40C02F2101/36B01J35/40B01J35/39
Inventor 张红玲唐海德·艾哈迈德徐红彬张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI