Continuous regulation and control method of carbon nitride energy band structure and method for preparing hydrogen peroxide through photocatalysis

A technology of energy band structure and carbon nitride, applied in hydrogen peroxide, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of insufficient valence band oxidation driving force, unfavorable separation and purification of products, and slow water oxidation rate, etc. problems, to achieve the effect of easy on-site amplification test, strong operability, and increased valence band potential

Active Publication Date: 2021-10-08
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, due to the insufficient valence band oxidation driving force of carbon nitride and its slow water oxidation rate, the photocatalytic reaction to produce hydrogen peroxide usually requires the addition of hole sacrificial agents, such as methanol, ethanol, isopropanol, etc., to consume Photogenerates holes and donates protons
The addition of sacrificial agent is unfavorable to the separation and purification of the product, and also reduces the economic benefit

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  • Continuous regulation and control method of carbon nitride energy band structure and method for preparing hydrogen peroxide through photocatalysis
  • Continuous regulation and control method of carbon nitride energy band structure and method for preparing hydrogen peroxide through photocatalysis
  • Continuous regulation and control method of carbon nitride energy band structure and method for preparing hydrogen peroxide through photocatalysis

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preparation example Construction

[0077] The invention provides a method for preparing carbon nitride with adjustable energy band structure, comprising the following steps:

[0078] 1) After mixing sodium borohydride or borax with carbon nitride, heat treatment is carried out under a nitrogen atmosphere to obtain a modified carbon nitride with an adjusted energy band structure.

[0079] In the present invention, the carbon nitride includes bulk carbon nitride.

[0080] The present invention is a complete and refined overall preparation process, which can better ensure the continuous adjustability and controllability of carbon nitride, ensure the morphology, structure and parameters of carbon nitride after regulation, and improve the subsequent photocatalytic performance. The above-mentioned bulk nitrogen Carbonized carbon can be specifically prepared by the following steps:

[0081] After calcining nitrogen-containing organic matter, bulk carbon nitride is obtained;

[0082] In the present invention, the nit...

Embodiment 1

[0118] Preparation method of carbon nitride with adjustable energy band structure

[0119] (1) Preparation of bulk carbon nitride

[0120] Weigh 10g of melamine, grind it, put it into a crucible, cover it, put the crucible into a muffle furnace, heat up to 550°C at a rate of 2°C / min, keep it for 4h, then stop heating, cool naturally, and finally grind fully to get a light yellow color bulk carbon nitride products;

[0121] (2) Preparation of carbon nitride with narrow band gap,

[0122] Mix 1g of the above-mentioned bulk carbon nitride powder with 1g of sodium borohydride, grind evenly, place the mixture in a porcelain boat, and then put it into a tube furnace, control the nitrogen flow rate to 50mL / min, and start heating after nitrogen gas is introduced for 1h , the heating rate is 2°C / min, heated to 300, 350, 375, 400 or 450°C, kept for 4h, then stopped heating, cooled naturally, ground, washed with deionized water three times, dried at 60°C, and finally sodium borohydride...

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Abstract

The invention provides a method for adjusting a carbon nitride energy band structure. The method comprises the following steps of: performing heat treatment by adopting different boron sources and carbon nitride, and controlling the temperature of the heat treatment to realize widening or narrowing of the carbon nitride energy band structure. According to the invention, continuous controllable widening or narrowing of a carbon nitride energy band structure is realized, and through modification of carbon nitride, valence band potential is increased, water oxidation activity is improved, and proper conduction band potential is reserved to drive oxygen to be reduced to generate hydrogen peroxide; the regulation and control method provided by the invention realizes continuous controllable regulation of the carbon nitride energy band structure, and can be used for synthesizing carbon nitride with a specific energy band structure; the prepared carbon nitride can be used for photocatalytic synthesis of hydrogen peroxide under the condition of not adding a sacrificial agent, and shows relatively high photocatalytic activity due to relatively narrow band gap, reasonable valence band and conduction potential; and the preparation method is simple, easy to operate, high in expansibility, low in cost and easy to amplify.

Description

technical field [0001] The invention belongs to the technical field of graphite-phase carbon nitride photocatalysts, and relates to a method for adjusting the energy band structure of carbon nitride, a method for preparing carbon nitride with adjustable energy band structure, and a method for preparing hydrogen peroxide by photocatalysis, in particular to A method for continuously regulating the energy band structure of carbon nitride, a method for preparing carbon nitride with adjustable energy band structure, and a method for preparing hydrogen peroxide by photocatalysis. Background technique [0002] Photocatalytic technology has attracted extensive attention due to its advantages of energy saving and environmental protection. The basic principle of photocatalytic technology is that when the photon energy of the incident light is higher than the band gap of the semiconductor, the valence band electrons of the semiconductor are excited to the conduction band, and photogene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B15/01
CPCB01J27/24B01J35/004C01B15/01
Inventor 俞汉青陈飞刘练练陈洁洁
Owner UNIV OF SCI & TECH OF CHINA
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