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Carbon-doped heterojunction photocatalyst and preparation method thereof

A photocatalyst, heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of weakening oxidation and reduction ability, etc., to enhance absorption, improve efficiency, and improve chemical Effects of stability and thermal stability

Pending Publication Date: 2020-11-06
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The oxidation and reduction reactions of traditional heterojunction photocatalysts occur in the high valence band and low conduction band, respectively, which is beneficial to the separation of photogenerated electrons and holes, but leads to weakened oxidation and reduction capabilities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Example: Preparation of carbon-doped carbon nitride / tungsten trioxide heterojunction photocatalyst

[0019] The direct method of carbon doping carbon nitride: Take 1mL cellulose nanocrystal (CNC) solution and add 20mL water to dilute, add 20g urea and stir ultrasonically to dissolve it completely, prepare CNC / urea aqueous solution with a concentration of 0.1%, dry it with a horse Furnace calcination, the holding temperature is 550°C, the heating rate is 10°C / min, and the holding time is 2h.

[0020] Hydrothermal method of carbon-doped carbon nitride: transfer the CNC / urea aqueous solution with a concentration of 0.1% to a polytetrafluoroethylene high-pressure reactor, the reaction temperature is 150°C, and the reaction time is 2h, followed by calcination.

[0021] Disperse 1g of sodium tungstate dihydrate in 50mL of water, add 1mL of lactic acid and stir, the solution turns from colorless and transparent to light yellow, add 3M hydrochloric acid to adjust the pH to 1, t...

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Abstract

The invention relates to a carbon-doped heterojunction photocatalyst and a preparation method thereof. The heterojunction photocatalyst with thermal stability is prepared from cellulose nanocrystalline, urea and sodium tungstate dehydrate through carbon doping of carbon nitride via a direct method and a hydrothermal method and conducting electrostatic self-assembling. The carbon-doped carbon nitride effectively inhibits microcrystalline growth to hinder phase change and enhances visible light absorption; through combination with tungsten trioxide, carrier lifetime is effectively prolonged, electrons are excited and electron mobility is improved; and compared with pure carbon nitride / tungsten trioxide, the photocatalyst of the invention has the advantages that the efficiency of photocatalytic tetracycline hydrochloride degradation is enhanced.

Description

technical field [0001] The invention belongs to the field of functional polymer materials and photocatalytic degradation of pollutants. Specifically, it relates to a carbon-doped carbon nitride / tungsten trioxide heterojunction photocatalyst. [0002] The present invention also relates to two preparation methods of the above-mentioned carbon-doped heterojunction photocatalyst. Background technique [0003] As a stable, non-toxic non-metal semiconductor photocatalyst, carbon nitride has a suitable band gap, can absorb visible light at a wavelength of 460-698nm, and has good chemical and thermal stability. Carbon nitride is widely used under visible light irradiation, such as photoinduced reduction of carbon dioxide, photocatalytic water splitting to generate hydrogen, and photocatalytic degradation of water and air pollutants. [0004] Pure carbon nitride photocatalysts are limited by insufficient visible light absorption and rapid carrier recombination, resulting in low pho...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24C02F1/30C02F2305/10C02F2101/38B01J35/39
Inventor 戴林赵聪
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY