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A boron nitride quantum dot/ultra-thin porous carbon nitride composite photocatalytic material and its preparation method and application

A composite photocatalytic, porous carbon nitride technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of inhibiting photocatalytic activity, insufficient photocatalytic activity, and few reactive sites. and other problems, to achieve the effect of being conducive to dispersion and loading, improving photocatalytic activity, and excellent catalytic activity

Active Publication Date: 2020-06-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current photocatalytic materials contain metal elements, and the light absorption area is mainly concentrated in the ultraviolet region, which seriously hinders the practical application of photocatalytic materials.
Graphite-like carbon nitride is a non-metallic photocatalytic material that can be excited by visible light, but the carbon nitride prepared by the general method is in the form of a block, with fewer active sites, and the photogenerated electron-hole pairs are easy to recombine, thereby inhibiting its photocatalytic activity
In the prior art, there have been related reports on boron nitride-modified carbon nitride composite photocatalytic materials, although in these composite photocatalytic materials, boron nitride is modified on carbon nitride to improve the photocatalytic activity of carbon nitride, However, these composite photocatalytic materials composed of boron nitride and carbon nitride are usually in the form of laminated blocks, which is not conducive to the separation and transfer of photogenerated carriers, and has defects such as few active functional groups and few reactive sites.
In addition, the boron nitride used in these composite photocatalytic materials is sandy or layered, and has defects such as poor dispersion, less exposed active functional groups and active centers, so it is not possible to modify it on carbon nitride. Significantly improve the separation and transfer rate of photogenerated carriers, but there are still problems such as insufficient photocatalytic activity

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  • A boron nitride quantum dot/ultra-thin porous carbon nitride composite photocatalytic material and its preparation method and application
  • A boron nitride quantum dot/ultra-thin porous carbon nitride composite photocatalytic material and its preparation method and application
  • A boron nitride quantum dot/ultra-thin porous carbon nitride composite photocatalytic material and its preparation method and application

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Embodiment 1

[0040] A boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material, which uses ultra-thin porous carbon nitride as a carrier, and boron nitride quantum dots are loaded on the ultra-thin porous carbon nitride.

[0041] In this embodiment, the average thickness of the ultrathin porous carbon nitride is 2.6 nm; the mass ratio of the boron nitride quantum dots to the ultrathin porous carbon nitride is 1:200.

[0042] A preparation method of the boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material in the above-mentioned present embodiment, comprising the following steps:

[0043] S1. Preparation of ultra-thin porous carbon nitride: Take 2 g of melamine and 1.207 g of thiourea and add them to 60 mL of ultrapure water to mix, stir for 30 minutes to obtain a suspension; Thermal reaction for 20 h, after natural cooling, use an organic phase filter membrane with a pore size of 0.22 μm to vacuum filter the product...

Embodiment 2

[0054] Application of a boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material in the treatment of antibiotics, specifically using boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material to degrade hydrochloric acid soil in water Mycin, including the following steps:

[0055] Take 50 mg of the boron nitride quantum dots / ultra-thin porous carbon nitride composite photocatalytic material prepared in Example 1, add it to 50 mL of oxytetracycline hydrochloride solution with an initial concentration of 10 mg / L, mix well, and Stir in a dark room (that is, under dark conditions) for 30 minutes to make the boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material reach adsorption equilibrium, and the resulting mixed solution is photocatalytically degraded under the condition of visible light with a wavelength λ>420nm After 60 minutes of reaction, the degradation of oxytetracyc...

Embodiment 3

[0059] Investigate the recyclability of the boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material of the present invention, comprising the following steps:

[0060] (1) After the photocatalytic degradation reaction in Example 2 is completed, the boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material is collected, washed with ultrapure water and ethanol for 3 times, and then dried to obtain regenerated nitrogen Boron oxide quantum dots / ultra-thin porous carbon nitride composite photocatalytic material.

[0061](2) Take 50 mg of the regenerated boron nitride quantum dots / ultra-thin porous carbon nitride composite photocatalytic material obtained in step (1), and add it to 50 mL of oxytetracycline hydrochloride solution with an initial concentration of 10 mg / L, Stir in the dark room for 30 minutes to make the boron nitride quantum dots / ultra-thin porous carbon nitride composite photocatalytic material re...

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Abstract

The invention discloses a boron nitride quantum dot / ultrathin porous carbon nitride composite photocatalytic material and its preparation method and application. The composite photocatalytic material uses ultrathin porous carbon nitride as a carrier, and the ultrathin porous carbon nitride Boron nitride quantum dots are loaded on it. The preparation method uses ultrathin porous carbon nitride and boron nitride quantum dot solution as raw materials, stirs until the solvent is completely evaporated, and obtains boron nitride quantum dots / ultrathin porous carbon nitride composite photocatalytic material. The composite photocatalytic material of the present invention has the advantages of environmental friendliness, good stability, easy dispersion, and high activity. It is a new type of visible light non-metal composite photocatalytic material with novel structure and excellent photocatalytic performance. The preparation method has the advantages of simple process, easy operation and low cost. The composite photocatalytic material of the present invention is used to degrade organic pollutants, can achieve effective removal of organic pollutants, has the advantages of simple operation, low cost, high removal rate, etc., and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic composite materials, and in particular relates to a boron nitride quantum dot / ultra-thin porous carbon nitride composite photocatalytic material and its preparation method and application. Background technique [0002] In recent years, pharmaceuticals and personal care products (PPCPs) have attracted increasing attention as an emerging pollutant, especially antibiotics, because they can enhance the resistance of bacteria in the environment and threaten human health. For example, oxytetracycline hydrochloride is a broad-spectrum antibiotic. If the oxytetracycline hydrochloride ingested by livestock and poultry is directly excreted without complete metabolism and absorption, the detection rate of oxytetracycline hydrochloride in livestock and poultry wastewater will increase. At present, conventional physical adsorption, chemical oxidation and biological filtration and other technical methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/38B01J35/60B01J35/39
Inventor 杨洋曾光明张辰黄丹莲程敏赖萃周成赟汪文军熊炜平贺东辉
Owner HUNAN UNIV