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Photocatalyst based on graphite phase carbon nitride g-C3N4, and preparation method and application thereof

A graphite-phase carbon nitride and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of high photogenerated electron-hole recombination rate, insufficient visible light absorption, and limited practical applications, etc. Problems, to achieve low cost, improve photocatalytic hydrogen production activity, and short operation cycle

Inactive Publication Date: 2018-10-23
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods usually prepare bulk g-C 3 N 4 , which has some shortcomings: such as small specific surface area, insufficient visible light absorption, high photogenerated electron-hole recombination rate, etc., which limit its practical application in the field of photocatalysis.

Method used

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  • Photocatalyst based on graphite phase carbon nitride g-C3N4, and preparation method and application thereof
  • Photocatalyst based on graphite phase carbon nitride g-C3N4, and preparation method and application thereof
  • Photocatalyst based on graphite phase carbon nitride g-C3N4, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Specific preparation method of HCNNS-300 photocatalyst

[0053] Using melamine as the precursor, roasting in the air, keeping it at 550°C for 4 hours, and then cooling down naturally, the bulk phase g-C 3 N 4 . Take a small amount of bulk g-C 3 N 4 In ethanol, the bulk phase g-C was passed through a cell disruptor 3 N 4 g-C stripped into few layers 3 N 4 Nanosheets, after drying, put them into an ultrasonic cleaner until they are dispersed in water, and then dry them to obtain g-C 3 N 4 Nanosheets. Will get g-C 3 N 4 Nanosheets in H 2 (10%) / N 2 (90%) roasting in a mixed gas, the temperature was raised to 300 °C at a heating rate of 5 °C / min, kept for 4 hours, and then the temperature was naturally lowered, that is, the HCNNS-300 photocatalyst was prepared.

[0054] figure 1 It is the X-ray powder diffraction pattern of the photocatalyst prepared in Example 1. Depend on figure 1 It can be seen that the photocatalyst has only one characteristic diffractio...

Embodiment 2

[0057] Specific preparation method of HCNNS-450 photocatalyst

[0058] Using melamine as the precursor, roasting in the air, keeping it at 550°C for 4 hours, and then cooling down naturally, the bulk phase g-C 3 N 4 . Take a small amount of bulk g-C 3 N 4 In ethanol, the bulk phase g-C was passed through a cell disruptor 3 N 4 g-C stripped into few layers 3 N 4 After the nanosheets are dried, put them into an ultrasonic cleaner until they are completely dispersed in water, and then dry them to obtain g-C 3 N 4 Nanosheets. Will get g-C 3 N 4 Nanosheets in H 2 (10%) / N 2 (90%) roasting in a mixed gas, raising the temperature to 450°C at a heating rate of 5°C / min, keeping it for 4 hours, and then cooling down naturally, that is, the HCNNS-450 photocatalyst was prepared.

[0059] figure 2 It is the X-ray powder diffraction pattern of the photocatalyst prepared in Example 2. Depend on figure 2 It can be seen that the photocatalyst has only one characteristic diffr...

Embodiment 3

[0062] Hydrogen yield test of photocatalyst

[0063] Add 90 milliliters of deionized water, 10 milliliters of triethanolamine, 10 milligrams of the photocatalysts prepared in the above-mentioned examples 1 and 2, and add 33 microliters of chloroplatinic acid (Pt load is 1.56wt% ), cover the reaction kettle, evacuate with a vacuum pump while stirring until no bubbles are produced in the liquid, and irradiate with a 300W xenon lamp (UV cut 420 filter). Sampling once per hour, sampling six times, the sample gas chromatograph 9790II, record the peak area, calculate the hydrogen production and hydrogen production rate. See results Figure 5 .

[0064] The result shows: in the embodiment of the present invention, HCNNS-300 photocatalyst, HCNNS-450 photocatalyst and g-C 3 N 4 The hydrogen production rate of the nanosheets is 670.97 μmol g -1 h -1 , 1689.51 μmol g -1 h -1 , 255.66 μmol g -1 h -1 .

[0065] According to the above results, it is shown that the hydrogen produc...

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Abstract

The invention discloses a photocatalyst based on graphite phase carbon nitride g-C3N4, and a preparation method and an application thereof. The photocatalyst based on graphite phase carbon nitride g-C3N4 has a high photocatalytic hydrogen production activity, the hydrogen production activity is higher than 600 [mu]mol.g<-1>.h<-1>, and the photocatalytic hydrogen production activity of bulk phase graphite phase carbon nitride g-C3N4 is significantly improved. The preparation method of the photocatalyst based on the graphite phase carbon nitride g-C3N4 comprises the following steps: preparing g-C3N4 nano-sheets from the bulk phase g-C3N4 by physical or chemical treatment, and calcining the g-C3N4 nano-sheets at a high temperature to prepare the photocatalyst based on graphite phase carbon nitride g-C3N4, with different photocatalytic activities. The preparation method has the advantages of simplicity, short operation cycle, low cost, and suitableness for large-scale industrial production. The photocatalyst based on graphite phase carbon nitride g-C3N4 can be used in the fields of photocatalytic water decomposition for hydrogen production, photocatalytic carbon dioxide reduction, fueldegradation, pollutant degradation and the like.

Description

technical field [0001] The invention mainly relates to the technical field of nanomaterials and hydrogen production catalysts, in particular to a graphite-phase carbon nitride g-C 3 N 4 Photocatalysts and their preparation methods and applications. Background technique [0002] Since the 21st century, with the rapid development of modern industrial technology, fossil fuels such as coal, oil, and natural gas have been consumed in large quantities, and the energy crisis is imminent; however, the resulting environmental problems have become more and more serious. The development and utilization of sustainable clean energy has become an irresistible trend. Hydrogen energy is regarded as the most promising clean energy in the 21st century. If it can replace non-renewable energy such as fossil fuels, it will benefit the whole society. [0003] Kroke et al. calculated by dense functional theory that the heptazine ring (C 6 N 7 ) as the basic structural unit of graphitic carbon...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C01B3/04
CPCC01B3/042B01J27/24C01B2203/0277C01B2203/1088B01J35/39B01J35/613B01J35/647B01J35/651B01J35/615Y02E60/36
Inventor 徐桂兰张华彬康遥张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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