Preparation method of efficient biforous g-C3N4 photocatalyst

A photocatalyst, g-c3n4 technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor mass transfer, small specific surface area, and low photocatalytic activity, and achieve Effects of separation promotion, high photocatalytic activity, and simple preparation method

Active Publication Date: 2020-02-21
GUANGXI TEACHERS EDUCATION UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006]Therefore, for g-C3N4 the specific surface area is small, photogenerated electron-hole pairs are easy to recombine, The poor mass transfer effect leads to its low photocatalytic activity. A simple, energy-saving and environmentally friendly g-C3N4 with large specific surface area and high photocatalytic activity was studied. The method is the key to its practicality

Method used

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  • Preparation method of efficient biforous g-C3N4 photocatalyst
  • Preparation method of efficient biforous g-C3N4 photocatalyst
  • Preparation method of efficient biforous g-C3N4 photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 50g of urea and place it in a crusher, crush it into powder at a speed of 10000r / min, spread the urea powder through a 40-mesh sieve in a square crucible with a thickness of 1mm, put the crucible in a muffle furnace, Starting from room temperature, the temperature is raised to 450°C at a rate of 1°C / min, that is, the heating rate is 1°C / min, kept at 450°C for 1 hour, and cooled naturally to obtain a light yellow solid powder g-C 3 N 4 , denoted as CN-1.

Embodiment 2

[0032] The preparation method of this example is the same as that of Example 1, except that the rotating speed of the crusher in Example 1 is changed to 26000r / min, and the prepared catalyst is designated as CN-2.

Embodiment 3

[0034] The preparation method of this example is the same as that of Example 1, except that the sieve of Example 1 is changed to 120 mesh, and the prepared catalyst is designated as CN-3.

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Abstract

The invention discloses a preparation method of an efficient biforous g-C3N4 photocatalyst. The method comprises the following steps: flatly spreading urea powder passing through a 40-200 mesh sieve in a container, calcining for 2-4 hours at 450-600 DEG C at an air environment, and cooling to obtain the faint yellow solid powder biforous g-C3N4 photocatalyst; wherein the flat spreading thickness is 1-5 mm, and the heating rate is 1-10 DEG C/min before calcination at the temperature of 450-600 DEG C. The preparation method is simple, excessive pretreatment of urea is not needed, direct one-timecalcination is enough, the activity on photocatalytic degradation of organic pollutants is high, the degradation speed of rhodamine B is high, and the degradation rate is high.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a preparation method of a high-efficiency double-hole g-C3N4 photocatalyst. Background technique [0002] Carbon nitride in graphite phase (g-C 3 N 4 ) due to its strong visible light absorption ability and narrow band gap (2.7eV), has a graphene-like flexible layered structure and has good catalytic activity for splitting water to produce hydrogen and degrading organic pollutants. Furthermore, unlike metal catalysts, g-C 3 N 4 It has the advantages of high thermal stability, non-toxic and environmental protection, and low preparation cost, and is expected to be practically applied in the fields of energy and environment. Cheng-Qun Xu et al. (Xu, Li et al. 2017) synthesized nitrogen-deficient graphitic carbon nitride (CN-HAc with a specific surface area of ​​15.9m 2 / g), using nitrogen vacancies to promote the separation of electron-hole pairs and hinder the recombina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08C01B21/06C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J27/24B01J35/004B01J35/1019B01J35/1061B01J37/082C01B21/0605C02F1/30C02F2101/30C02F2101/34C02F2101/36C02F2101/38C02F2305/10C01P2006/12Y02E60/36
Inventor 杨晶张纤千韦良卢力萍龙洁清李莉
Owner GUANGXI TEACHERS EDUCATION UNIV
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