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Oxygen-doped graphitic carbon nitride photocatalyst as well as preparation method and application thereof

A carbon nitride light and photocatalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​photocatalysts, and solve the problem of insufficient photocatalytic performance, The effect of abundant raw material sources and low cost

Active Publication Date: 2020-10-02
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Therefore, the technical problem to be solved by the present invention is to overcome the g-C3N4 light in the prior art The catalyst has a small specific surface area defect, thereby providing a preparation method for an oxygen-doped graphite-like carbon nitride photocatalyst

Method used

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  • Oxygen-doped graphitic carbon nitride photocatalyst as well as preparation method and application thereof
  • Oxygen-doped graphitic carbon nitride photocatalyst as well as preparation method and application thereof
  • Oxygen-doped graphitic carbon nitride photocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Put 5 g of melamine in a muffle furnace, under a nitrogen atmosphere, raise the temperature to 550 °C at a rate of 5 °C / min, and calcinate for 2 hours to obtain a yellow aggregate, mix the yellow aggregate with 10 mL of absolute ethanol, grind for 10 min, and use Rinse with water ethanol and deionized water, and dry to obtain g-C 3 N 4 ,spare.

Embodiment 2

[0038] Weigh 400mg g-C 3 N 4 (prepared in Example 1) placed in an agate mortar, added 100 mg of ascorbic acid, then ground for 10 minutes, after grinding evenly, placed in a tubular muffle furnace, heated to 300 ° C under a nitrogen atmosphere, kept for 2 hours, and cooled after the reaction After reaching room temperature, the obtained sample was fully ground to obtain oxygen-doped g-C 3 N 4 The photocatalyst is denoted as O-CN1.

Embodiment 3

[0040] Weigh 400mg g-C 3 N 4 (prepared in Example 1) placed in an agate mortar, added 140 mg of ascorbic acid, then ground for 10 minutes, after grinding evenly, placed in a tubular muffle furnace, heated to 350 ° C under a nitrogen atmosphere, kept for 1.5 hours, and the reaction ended After cooling to room temperature, the obtained sample was fully ground to obtain oxygen-doped g-C 3 N 4 Photocatalyst, denoted as O-CN2.

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Abstract

The invention provides a preparation method of an oxygen-doped graphitic carbon nitride photocatalyst, which comprises the steps of mixing and grinding g-C3N4 and ascorbic acid, heating, keeping the temperature, and cooling to room temperature to obtain the oxygen-doped g-C3N4 photocatalyst. By pyrolyzing a ground mixture of ascorbic acid and pure g-C3N4 and changing the physical tissue structureof the g-C3N4 through ascorbic acid decomposition, the catalyst with a large specific surface area can be obtained. Based on the fact that ascorbic acid is easy to decompose during heating, ascorbic acid is heated to mainly generate furan derivatives, pentabasic alcohol and polyunsaturated cyclic ketone, the furan derivatives, pentabasic alcohol and polyunsaturated cyclic ketone can be used as oxygen doping sources, oxygen elements are doped into g-C3N4, and high-oxygen-doped g-C3N4 is obtained.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to an oxygen-doped graphite-like carbon nitride photocatalyst and its preparation method and application. Background technique [0002] With the continuous development of industry, environmental problems are becoming more and more serious. Chromium and its compounds are widely used in metallurgy, electroplating, printing and dyeing and other industries, resulting in a large amount of Cr(VI)-containing wastewater. Cr(VI) is toxic, and long-term exposure can cause cancer. At present, the treatment of Cr(VI) sewage mainly includes physical treatment, chemical treatment and biological treatment. However, these three methods still cause pollution or secondary pollution to the environment. Photocatalytic technology has the advantages of green, no secondary pollution and effective conversion of solar energy. During the photocatalytic reduction of Cr(VI), the photogenerated e that is excite...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/10C02F1/30C02F1/70C02F101/22
CPCB01J27/24B01J37/082B01J37/0036C02F1/30C02F1/70C02F2101/22C02F2305/10B01J35/613B01J35/633B01J35/39Y02W10/37
Inventor 余长林张振民周晚琴樊启哲纪红兵魏龙福
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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