Preparation method of two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride/defective tungsten oxide

A heterojunction and recombination light technology, which is applied in the field of environmental pollution control, can solve the problems that the legacy pollution is difficult to be solved reasonably, and there is no composite construction of S-type heterojunction photocatalysts, etc., so as to improve the redox ability and high sunlight Effect of Utilization, Accelerated Transfer

Active Publication Date: 2020-09-15
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the popularization and application of antibiotics, the problem of their residual pollution in the environment has been difficult to be reasonably solved
So far, no link between S-pCN and WO 2.72 Public report on composite construction of S-type heterojunction photocatalysts

Method used

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  • Preparation method of two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride/defective tungsten oxide
  • Preparation method of two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride/defective tungsten oxide
  • Preparation method of two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride/defective tungsten oxide

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Embodiment 1

[0024] A method for preparing a two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride / defective tungsten oxide, comprising the following steps:

[0025] (1) In a typical synthesis, 10g of urea was added to 20mL of distilled water, stirred magnetically at 25°C for 30min until it was dissolved, then added 10mg of thioacetamide, stirred at 25°C for 1h to obtain a colorless transparent solution, transferred Put it into a crucible in a semi-closed state, raise the temperature to 300°C at a heating rate of 5°C / min in a rapid heating furnace, and keep it for 1 hour; to room temperature, grind and sieve to obtain S-pCN;

[0026] (2) Weigh 1g of tungsten chloride and add it to a conical flask containing 80mL of ethanol, fill it with N for 5min 2 After compressing the gas and sealing it, stir rapidly for 5 minutes under completely sealed conditions to completely dissolve it into a yellow liquid, quickly transfer it to a 100ml polytetrafluoroet...

Embodiment 2

[0029] A method for preparing a two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride / defective tungsten oxide, comprising the following steps:

[0030] (1) In a typical synthesis, add 30g of urea into 40mL of distilled water, stir magnetically at 60°C for 30min until it dissolves, add 100mg of thioacetamide, stir at 60°C for 1h to obtain a colorless transparent solution, and then Transfer it into a semi-closed crucible, raise the temperature to 350°C at a heating rate of 20°C / min in a rapid heating furnace, and keep it for 4 hours; Cool down to room temperature, grind and sieve to get S-pCN;

[0031] (2) Weigh 3g of tungsten chloride and add it to a conical flask containing 200mL of ethanol, fill it with N for 5min 2 After compressing the gas and sealing it, stir rapidly for 5 minutes under completely sealed conditions to completely dissolve it into a yellow liquid, quickly transfer it to a 300ml polytetrafluoroethylene liner, and f...

Embodiment 3

[0034] A method for preparing a two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride / defective tungsten oxide, comprising the following steps:

[0035] (1) In a typical synthesis, 50g of urea was added to 80mL of distilled water, stirred magnetically at 80°C for 30min until it was dissolved, then added 200mg of thioacetamide, stirred at 80°C for 1h to obtain a colorless transparent solution, and transferred to In a crucible in a semi-closed state, heat up to 400°C at a heating rate of 30°C / min in a rapid heating furnace, and hold for 8 hours; then raise the temperature to 600°C at a heating rate of 30°C / min, hold for 8 hours, and then cool down naturally. to room temperature, grind and sieve to obtain S-pCN;

[0036] (2) Weigh 5g of tungsten chloride and add it to a conical flask containing 400mL of ethanol, fill it with N for 5min 2 After compressing the gas and sealing it, stir it quickly for 15 minutes under completely sealed con...

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Abstract

The invention discloses a preparation method of a two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride / defective tungsten oxide. The sulfur-doped porous carbon nitride / defective tungsten oxide (S-pCN / WO2.72) is a two-dimensional S-type heterojunction composite photocatalyst which is constructed by compounding sulfur-doped porous carbon nitride (S-pCN) and defective tungsten oxide (WO2.72). The preparation method comprises the following steps of: taking urea and thioacetamide as raw materials, and preparing S-pCN through a simple calcining method; preparing WO2.72 by taking tungsten chloride as a raw material and ethanol as a solvent and adopting a solvothermal method; letting S-pCN and WO2.72 be subjected to a solvent evaporation induced self-assembly method in an ethanol solvent to prepare the S-pCN / WO2.72. The method has the advantages that the process is simple, the cost is low, the sunlight utilization range is wider, surface oxygen vacancies are introduced to improve the separation capacity of electron hole pairs, a built-in electric field is constructed on a heterojunction interface to promote separation of photo-induced charges andimprove the oxidation-reduction capacity of the composite catalyst, and efficient photocatalytic degradation of sewage and wastewater is expected to be achieved.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a preparation method of a two-dimensional S-type heterojunction composite photocatalyst sulfur-doped porous carbon nitride / defective tungsten oxide. Background technique [0002] With the popularization and application of antibiotics, the problem of their residual pollution in the environment has been difficult to be reasonably solved. Photocatalytic degradation through efficient use of solar energy can provide a better solution to this problem. Carbon Nitride (g-C 3 N 4 ) has attracted extensive attention due to its good stability, suitable bandgap, low cost, and convenient synthesis. At present, there have been a large number of reports on g-C 3 N 4 The research on the degradation of organic pollutants, however, is limited by its visible light catalytic efficiency, g-C alone 3 N 4 The practical application of the material is less. g-C can be impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/38C02F101/30
CPCB01J35/004B01J27/24B01J35/023C02F1/30C02F2101/38C02F2305/10C02F2101/30
Inventor 李喜宝康棒棒黄军同冯志军陈智刘积有李海罗秋柠马心全王伟伟刘强汪阿阳孟祥鑫于凯涵程晓李秋燕
Owner NANCHANG HANGKONG UNIVERSITY
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