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Boron-modified carbon nitride material as well as preparation method and application thereof

A carbon nitride, atomic technology, applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of easy deactivation, low reactivity, poor product selectivity, etc., and achieves a simple preparation method, The effect of convenient synthesis method, strong adsorption and ability to activate O2

Active Publication Date: 2022-07-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current photocatalytic selective oxidation of alcohols still has problems such as low reactivity, poor product selectivity, and easy deactivation.

Method used

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  • Boron-modified carbon nitride material as well as preparation method and application thereof
  • Boron-modified carbon nitride material as well as preparation method and application thereof
  • Boron-modified carbon nitride material as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] In a second aspect, the present invention provides a method for preparing the boron-modified carbon nitride material, which includes the steps of: mixing urea and boric acid solution, evaporating the solvent, recrystallization, and calcining the recrystallized mixture, so that B atoms are replaced by sp in the 3-s-triazine ring 2 Hybridized C atoms into g-C 3 N 4 In the framework, boron-modified carbon nitride materials were prepared.

[0029] The B atom is replaced by sp in the 3-s-triazine ring 2 Hybridized C atoms into g-C 3 N 4 in the skeleton and does not affect g-C 3 N 4 Basic crystal structure. g-C obtained by mixing calcined urea and boric acid 3 N 4 Compared with g-C obtained by simply calcining urea 3 N 4 It has more excellent visible light responsiveness and carrier separation efficiency, and can significantly inhibit the recombination of photogenerated electron-hole pairs.

[0030] In some embodiments, the solvent is water or ethanol.

[0031] In ...

Embodiment 1

[0045] A boron-modified g-C 3 N 4 Photocatalyst and preparation method thereof, comprising the following steps:

[0046] (1) 10g of urea and 10mg of boric acid were dissolved in 30mL of deionized water, and vigorously stirred for 30min;

[0047] (2) Transfer the above mixed solution to a heating table and heat to evaporate the solvent, recrystallize, and evaporate at a temperature of 80°C for 12h;

[0048] (3) Grind the obtained recrystallization mixture uniformly, and heat it at 550°C for 5°C min -1 The heating rate was calcined in Air atmosphere for 4h;

[0049] (4) After the muffle furnace was naturally cooled, the obtained sample was washed with a large amount of deionized water to remove residual boric acid and incompletely polymerized soluble substances, and dried in an oven at 60°C.

Embodiment 2

[0051] The difference from Example 1 is that 1 mg of boric acid is added in step (1).

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Abstract

The invention discloses a boron-modified carbon nitride material as well as a preparation method and application thereof, urea and a boric acid solution are mixed and dissolved, a solvent is evaporated, recrystallization is performed, a recrystallized mixture is calcined, a B atom is enabled to enter a g-C3N4 skeleton by substituting a sp2-hybridized C atom in a 3-s-triazine ring, and the boron-modified carbon nitride material is prepared. The synthesis method is convenient, and the boron modified g-C3N4 photocatalyst material can be obtained through simple stirring, evaporation, grinding and air calcination in a muffle furnace. According to the preparation method, boric acid is utilized to enable B atoms to enter a g-C3N4 skeleton by replacing sp2-hybridized C atoms in a 3-s-triazine ring in a thermal polymerization process of urea, so that the g-C3N4 has higher photon-generated carrier separation capacity and reactive oxygen species generation capacity.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to the technical field of photocatalytic organic selective oxidation, and relates to a boron-modified carbon nitride material and a preparation method and application thereof. Background technique [0002] The statements herein merely provide background related to the present invention and do not necessarily constitute prior art. [0003] Carbonyl compounds such as aldehydes and ketones are an important class of organic synthesis building blocks and are widely used in food, pharmaceutical and cosmetic industries. The selective oxidation of alcohols to the corresponding carbonyl compounds is a key functional group transformation process in organic synthesis. However, traditional oxidation methods usually require the use of high-valence heavy metal salts such as Mn and Cr, or expensive iodine reagents such as DMP, IBX, etc. This not only increases the production cost, but als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C45/38C07C47/54
CPCB01J27/24C07C45/38B01J35/39C07C47/54Y02E60/36
Inventor 王泽岩鲍晓磊黄柏标郑昭科王朋程合锋刘媛媛张倩倩张晓阳
Owner SHANDONG UNIV
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