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Salt-assisted synthesized multi-morphology carbon nitride as well as preparation method and application thereof

A technology of nitriding carbon light and carbon light, which is applied in the field of photocatalysis, can solve problems affecting photocatalytic activity, etc., and achieve the effects of improved dye degradation efficiency, large specific surface area, and various shapes

Active Publication Date: 2021-06-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surfactants and block copolymers used in the soft template method will produce carbon residues during the reaction that cannot be removed, and the carbon residues are likely to provide potential recombination sites, thereby affecting the photocatalytic activity.

Method used

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  • Salt-assisted synthesized multi-morphology carbon nitride as well as preparation method and application thereof
  • Salt-assisted synthesized multi-morphology carbon nitride as well as preparation method and application thereof
  • Salt-assisted synthesized multi-morphology carbon nitride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Preparation of embodiment 1 photocatalyst and performance test thereof

[0046] (1) Preparation of photocatalyst

[0047] Catalyst 1: Weigh 10 g of melamine, place it in a muffle furnace for calcination, raise the temperature to 550° C. at a rate of 2.5° C. / min, and keep it warm for 4 hours. After cooling to room temperature, it was ground into powder to make catalyst 1 (named BCN).

[0048] Catalyst 2: Dissolve 0.25g of melamine and 0.25g of cyanuric acid in 20mL of dimethyl sulfoxide (DMSO) solvent respectively, ultrasonicate for 30min, then mix the two solutions to obtain a white suspension, centrifuge, ethanol, After washing with water, disperse in 20 mL of deionized water, quickly freeze with liquid nitrogen, and dry in a freeze dryer for 24 hours. The obtained powder was placed in a muffle furnace and heated to 350°C at a heating rate of 2.5°C / min, and kept for 30min. After cooling to room temperature, catalyst 2 (named S-CN) was prepared.

[0049] Catalyst 3: D...

Embodiment 2

[0059] Embodiment 2 The effect of solvent action on carbon nitride photocatalyst degradation performance

[0060] (1) Carbon nitride photocatalysts synthesized under the action of different solvents

[0061] Dissolve 0.25g melamine and 0.25g cyanuric acid in 20mL DMSO, methanol, ethanol, ethylene glycol, acetone, water or DMF respectively, ultrasonicate for 30min, then mix the two solutions, centrifuge, wash with ethanol and water Net, a solid substance was obtained. Take 0.5g of solid matter and disperse it in 20mL of saline solution (containing 1.2g NaCl and 3.8g KNO 3 ), was quickly frozen with liquid nitrogen, and dried in a freeze dryer for 24 hours. The obtained powder was placed in a muffle furnace and heated to 350°C at a heating rate of 2.5°C / min, and kept for 30min. After cooling to room temperature, wash with deionized water several times to remove residual salt, and dry at 60°C overnight. The corresponding solvents DMSO, methanol, ethanol, ethylene glycol, acet...

Embodiment 3

[0066] Example 3 Effect of Salt Concentration on Carbon Nitride Photocatalyst Degradation Performance

[0067] (1) Carbon nitride photocatalysts prepared under different salt concentrations

[0068] Dissolve 0.25g of melamine and 0.25g of cyanuric acid in 20mL of DMSO solvent respectively, ultrasonicate for 30min, then mix the two solutions, centrifuge, wash with ethanol and water to obtain a solid substance. Prepare 20mL salt solution, its mass concentration is respectively 50, 125, 250 and 375mg / mL (wherein NaCl and KNO 3 The mass ratio is 1:3), and 0.5g of solid matter was added respectively, and after dispersion, it was quickly frozen with liquid nitrogen, and dried in a freeze dryer for 24 hours. The obtained powder was placed in a muffle furnace and heated to 350°C at a heating rate of 2.5°C / min, and kept for 30min. After cooling to room temperature, they were washed several times with deionized water to remove residual salt, and dried overnight at 60°C to prepare cata...

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Abstract

The invention discloses salt-assisted synthesized multi-morphology carbon nitride as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. Melamine and cyanuric acid are used as raw materials, carbon nitride is prepared by using a salt template method, and the morphology and structure of the carbon nitride are adjusted by changing the solvent type, salt concentration, calcination temperature and time, so that the catalyst can be guaranteed to have multiple morphologies and can efficiently catalyze and degrade organic pollutants. Experiments prove that compared with blocky carbon nitride synthesized by a traditional direct calcination method, the photocatalyst disclosed by the invention has a good catalytic effect on organic matters, the elimination rate on a methylene blue solution within 60 minutes is up to 95%, and the photocatalyst can be recycled for multiple times. The reaction products of the prepared photocatalyst are CO2 and H2O, secondary pollution is avoided, and the photocatalyst has the advantages of being green, efficient, low in cost and the like.

Description

technical field [0001] The invention relates to a salt-assisted multi-morphology carbon nitride and its preparation method and application, belonging to the technical field of photocatalysis. Background technique [0002] Semiconductor photocatalysis has received extensive attention as a potential solution to energy crisis and environmental problems. Photocatalysis is a promising, clean and sustainable approach to the problem of organic pollution in water systems. Among numerous photocatalysts, graphitic carbon nitride, a metal-free polymer organic semiconductor, has attracted extensive research interest due to its excellent chemical and thermal stability, nontoxicity, facile synthesis, and low cost. However, the bulk graphitic carbon nitride prepared by direct polycondensation of precursors has low utilization efficiency of visible light and fast recombination rate of light-generated carriers, resulting in poor photocatalytic activity. To further enhance the photocatalyti...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/08B01J37/32B01J37/08C02F1/30C02F101/30
CPCB01J27/24B01J37/32B01J37/082C02F1/30C02F2305/10C02F2101/308B01J35/51B01J35/39
Inventor 王婵宋启军顾文秀卫邦琪贺依民
Owner JIANGNAN UNIV
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