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Carbon-coated carbon nitride nanowires and its preparation method and application of photocatalytic degradation of bisphenol-a

A carbon-coated carbon nitride and carbon nitride-coated technology, which is applied in the field of photocatalytic materials, can solve the problems of wide spectral response, large specific surface area, high photocatalytic activity, and reduced bandgap width, so as to broaden the range of visible light. Effects of absorption range, separation promotion, and high photocatalytic degradation activity

Active Publication Date: 2021-05-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hu et al. (Hu et al.Enhanced visible lightphotocatalytic performance of g-C 3 N 4 photocatalysts co-doped with iron and phosphorus [J]. Applied Surface Science, 2014, 331, 164-171.) Using dicyandiamide monomer, ferric nitrate and diammonium hydrogen phosphate as precursors, prepared iron and phosphorus co-doped nitrogen The research results show that the addition of dopants inhibits the crystal growth of graphitic carbon nitride, increases the specific surface area of ​​carbon nitride, reduces the band gap width, and inhibits the recombination of photogenerated electrons and holes; but Its light absorption is only up to 550nm, and it is difficult to balance wide spectral response, large specific surface area and high photocatalytic activity

Method used

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  • Carbon-coated carbon nitride nanowires and its preparation method and application of photocatalytic degradation of bisphenol-a
  • Carbon-coated carbon nitride nanowires and its preparation method and application of photocatalytic degradation of bisphenol-a
  • Carbon-coated carbon nitride nanowires and its preparation method and application of photocatalytic degradation of bisphenol-a

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Embodiment 1

[0050] This embodiment provides a carbon-coated carbon nitride nanowire, the preparation method of which comprises the following steps:

[0051] (1) Add 1 g of polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer into 61 mL of water and stir at a constant temperature of 35 ° C. Under stirring conditions, add 7 mL of 2 mol / L nitric acid dropwise The solution was stirred at a constant temperature of 35°C for 24 hours until the polyethylene glycol-polypropylene glycol-polyethylene glycol was completely dissolved; then 2.5 g of dicyandiamide was added and stirred at a constant temperature of 35°C for 20 hours to obtain a uniform mixed solution;

[0052] (2) Transfer the above mixed solution to a 100mL reaction kettle, conduct a hydrothermal reaction at 80°C for 24h, and after natural cooling, freeze-dry the obtained product for 5d to obtain a carbon-coated carbon nitride nanowire precursor;

[0053] (3) Place the precursor of carbon-coated carbon nitride...

Embodiment 2

[0056] With bisphenol A as the target pollutant, the carbon-coated carbon nitride nanowire prepared in Example 1 is used as a catalyst to carry out an evaluation experiment of photocatalytic degradation activity. The evaluation experiment is carried out in the following manner:

[0057] Add 10 mg of carbon-coated carbon nitride nanowires to 50 mL of bisphenol A with an initial concentration of 5 ppm. Before the reaction starts, the adsorption is carried out under dark conditions, and the reaction starts after the adsorption equilibrium is reached.

[0058] A 300W Xe lamp is used as a light source, and a (420nm) cut-off filter is installed on it, and the distance between the light source and the reaction liquid surface is 10cm. During the reaction time of 50 minutes, samples were taken every 10 minutes, and the change of the concentration of bisphenol A was detected by high-performance liquid chromatography. During the reaction, the solution was always in a stirring state.

[0...

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Abstract

The invention provides a carbon-coated carbon nitride nanowire, a preparation method thereof and an application of photocatalytic degradation of bisphenol A. The preparation method comprises: adding polyethylene glycol-polypropylene glycol-polyethylene glycol tri-block copolymer into water, adding nitric acid under stirring conditions, and waiting for polyethylene glycol-polypropylene glycol-polyethylene glycol tri-block copolymerization After the substance dissolves, add dicyandiamide and continue to stir to obtain a mixed solution; move it to a reactor for hydrothermal reaction, and freeze-dry the product to obtain a carbon-coated carbon nitride nanowire precursor; carbon-coated nitrogen The precursor of carbonized carbon nanowires is calcined at high temperature to obtain carbon-coated carbon nitride nanowires. The carbon-coated carbon nitride nanowire has a three-dimensional network structure, and the diameter of the nanowire is 50-100 nm, which has strong mechanical strength; it is applied to photocatalytic degradation of bisphenol A, and has high photocatalytic degradation activity, which is different from simple Compared with carbon nitride, the specific surface area is significantly increased, the spectral response range is greatly expanded, and the degradation rate is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a carbon-coated carbon nitride nanowire, a preparation method thereof and an application of photocatalytic degradation of bisphenol A. Background technique [0002] With the rapid development of industry, environmental pollution has become one of the most serious threats to human society, especially water pollution has aroused great concern. Photocatalytic technology is a new technology developed rapidly in recent decades. It can completely mineralize organic pollutants into carbon dioxide and water without secondary pollution. It has unique characteristics for degrading highly toxic and low-concentration organic pollutants in water environments. The advantages. Graphite carbon nitride (g-C 3 N 4 ) is the most stable carbon nitride structure at room temperature. As a metal-free visible light catalyst, it can absorb part of visible light, has good thermal stabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/06B01J37/10B01J37/08C02F1/30C02F101/34
CPCB01J27/24B01J35/004B01J35/023B01J35/06B01J37/082B01J37/10C02F1/30C02F2101/345C02F2305/10
Inventor 王雅君姜桂元李宇明刘萌萌
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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