Graphite-phase carbon nitride photocatalyst for sewage treatment and preparation method thereof

A phase carbon nitride light and sewage treatment technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, light water/sewage treatment, etc. Melamine reaction, small specific surface area of ​​g-C3N4, etc., to achieve excellent photocatalytic activity, enhanced photocurrent response, and time-saving preparation methods

Pending Publication Date: 2022-06-17
国家电投集团山西铝业有限公司 +1
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  • Abstract
  • Description
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Problems solved by technology

However, it is a difficult problem to find cothermal small molecules for precursor modification. If the choice is inappropriate, the synthesized product will not meet the expectations. The obtained g-C3N4 has a small specific surface area, a low degree of polymerization, and poor photocatalytic activity.
[0005] Patent 201710114794.8 discloses a rapid preparation method of a carbon-doped porous graphite phase carbon nitride nano-dispersion system. First, melamine and hexamethylenetetramine are physically mixed, and the mixture of melamine and hexamethylenetetramine is calcined to make The gas produced by the decomposition of hexamethylenetetramine interacts with melamine. Due to the reaction between the solid phase and the gas phase, the reaction itself is very difficult, and it is impossible to prove that the reaction between the gas and melamine has indeed occurred, let alone the graphite phase nitriding produced. Carbon performance boost

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  • Graphite-phase carbon nitride photocatalyst for sewage treatment and preparation method thereof
  • Graphite-phase carbon nitride photocatalyst for sewage treatment and preparation method thereof
  • Graphite-phase carbon nitride photocatalyst for sewage treatment and preparation method thereof

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preparation example Construction

[0030] The invention discloses a novel preparation method of a graphitic carbon nitride photocatalyst for sewage treatment, comprising the following steps: in a closed environment, hydrothermally reacting melamine and hexamethylenetetramine to obtain a modified precursor; The modified precursor is calcined at high temperature to obtain modified graphitic carbon nitride.

[0031] Specifically, the procedure is: the mass ratio of melamine to hexamethylenetetramine is 4200: (50-1000), that is, the mass of melamine is a fixed value of 4200mg, and the mass of hexamethylenetetramine is 50-1000mg The dispersant is water. The hydrothermal reaction of the present invention includes: raising the temperature to 160-200° C. and maintaining the temperature for 16-24 hours. In the high temperature calcination reaction of the modified precursor, the mass of the precursor is 1-3 g, and the temperature control program is set as: the temperature is raised to 500-600° C. within 80-120 min, and ...

Embodiment 1

[0034] This embodiment provides a graphite phase carbon nitride photocatalyst for sewage treatment, and the mass ratio of melamine to hexamethylenetetramine is 4200:50.

[0035] The present embodiment provides a preparation method of a graphitic carbon nitride photocatalyst for sewage treatment, comprising:

[0036] Step 1. Take 4.2g of melamine and 50mg of hexamethylenetetramine (HMTA), add them to 30mL of aqueous solution under stirring, and stir for 15 minutes;

[0037] Step 2, placing the dispersion system described in step 1 in a hydrothermal reactor and sealing;

[0038] Step 3, put the hydrothermal reactor described in step 2 into the heating device, then heat up to 180°C and keep for 20h;

[0039] Step 4. The system after the reaction in step 3 is water-cooled, centrifuged, washed, and dried to obtain the processed melamine M-HT-HMTA-0; in M-HT-HMTA-x, x represents the amount of HMTA input (mg) ;

[0040] Step 5, after the precursor obtained in step 4 is ground, 2g is...

Embodiment 2

[0044] This example is the same as Example 1, with the difference that the amount of HMTA input in step 1 is 200 mg to obtain the modified precursor M-HT-HMTA-200 and the graphitic carbon nitride photocatalyst CN-HT -HMTA-200.

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Abstract

The invention discloses a graphite phase carbon nitride photocatalyst for sewage treatment and a preparation method thereof, the raw materials of the catalyst are melamine and hexamethylenetetramine in a mass ratio of 4200: (50-1000), and the preparation method of the catalyst comprises the following steps: carrying out a hydrothermal reaction on melamine and hexamethylenetetramine in a closed environment to obtain a novel precursor; carrying out high-temperature calcination on the modified precursor to obtain modified graphite phase carbon nitride; a photocatalytic degradation activity test result of the photocatalyst shows that the activity is improved by 8.5 times compared with that before modification, the modified graphite-phase carbon nitride introduces defects, the interlayer spacing is increased, the band gap is narrowed, the modified graphite-phase carbon nitride has stronger photocurrent response, and carrier recombination is inhibited.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a graphite phase carbon nitride photocatalyst for wastewater treatment and a preparation method thereof. Background technique [0002] Graphitic carbon nitride (g-C 3 N 4 ) is a kind of photocatalyst with visible light photocatalytic reaction activity, which has the advantages of good thermal / chemical stability, non-toxic and non-polluting, etc. Extensive research. in g-C 3 N 4 In the application of removing organic pollutants, g-C is usually prepared by direct sintering of precursors (such as melamine, urea, biuret, etc.) 3 N 4 . Due to the traditional sintered g-C 3 N 4 Small specific surface area, low visible light utilization efficiency, low electrical conductivity, fast photogenerated carrier recombination efficiency, fewer interface (light) reaction active sites, slow surface reaction kinetics and moderate oxidation capacity, and low cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10B01J37/08C02F1/30C01B21/082C02F101/30
CPCB01J27/24B01J37/10B01J37/08B01J35/004C02F1/30C01B21/0605C02F2101/30
Inventor 赵忠斌姜雨舟王永进
Owner 国家电投集团山西铝业有限公司
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