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Hydrogen-free precursor synthesized carbon nitride photocatalyst

A catalyst and precursor technology, which is applied in the field of carbon nitride photocatalyst and its preparation, can solve the problems of incomplete polymerization of carbon nitride photocatalyst, inability to fully utilize sunlight, and excessive amino residues, etc. The effect of promotion, high photocatalytic hydrogen production activity, and low energy consumption

Active Publication Date: 2015-03-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon nitride photocatalysts prepared by traditional methods have problems such as incomplete polymerization, large residual amino groups, inability to make full use of sunlight, and low quantum efficiency.

Method used

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  • Hydrogen-free precursor synthesized carbon nitride photocatalyst
  • Hydrogen-free precursor synthesized carbon nitride photocatalyst
  • Hydrogen-free precursor synthesized carbon nitride photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, weigh cyanuric chloride, potassium thiocyanate and lithium chloride with a molar ratio of 1:3:4.32, and grind and mix them evenly under a nitrogen protective atmosphere. The uniformly ground and mixed solid powder was placed in an alumina crucible with a lid, and calcined in a nitrogen atmosphere at a temperature of 500° C. for 4 hours. After natural cooling, the sample was taken out and ground into powder to obtain a salt-containing carbon nitride photocatalyst.

Embodiment 2

[0022] First, weigh cyanuric chloride, potassium thiocyanate and lithium chloride with a molar ratio of 1:3:4.32, and grind and mix them evenly under a nitrogen protective atmosphere. The uniformly ground and mixed solid powder was placed in an alumina crucible with a cover, and calcined in a nitrogen atmosphere at a temperature of 500° C. for 4 hours. After natural cooling, the sample was taken out and ground into powder, boiled with deionized water, filtered with suction and dried to obtain the carbon nitride photocatalyst with the salt removed.

Embodiment 3

[0024] First, weigh cyanuric chloride, potassium thiocyanate and lithium chloride with a molar ratio of 1:3:4.32, and grind and mix them evenly under a nitrogen protective atmosphere. The uniformly ground and mixed solid powder was placed in an alumina crucible with a lid, and calcined in a nitrogen atmosphere at a temperature of 550° C. for 4 hours. After natural cooling, the sample was taken out and ground into powder to obtain a salt-containing carbon nitride photocatalyst.

[0025] figure 1 It is the powder X-ray diffraction spectrogram of the carbon nitride photocatalyst obtained in Example 2. It can be found from the figure that the prepared carbon nitride photocatalyst is an amorphous substance.

[0026] figure 2 It is the Fourier transform infrared spectrogram of the carbon nitride photocatalyst obtained in Example 2. This figure demonstrates the successful synthesis of carbon nitride photocatalysts. 800 cm in the picture -1 and 1200~1600 cm -1 The signals in t...

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Abstract

The invention discloses a hydrogen-free precursor synthesized carbon nitride photocatalyst, as well as a preparation method and application thereof, and belongs to the technical field of material preparation and photocatalysis. According to the preparation method, cyanuric chloride, potassium thiocyanate and lithium chloride are adopted as the precursor to synthesize the carbon nitride photocatalyst. The prepared carbon nitride photocatalyst is narrow in band gap and high in quantum efficiency; by adopting platinum as a catalyst promoter and triethanol amine as a sacrifice agent, the photocatalytic activity of the carbon nitride photocatalyst for producing hydrogen exceeds that of the commercial titanium dioxide photocatalyst P25 under the lighting condition of greater than 300 nm; the preparation method is simple in technology and low in cost, conforms to the actual production demand, and has great application potential.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a carbon nitride photocatalyst synthesized without a hydrogen precursor, a preparation method and application thereof. Background technique [0002] With the rapid development of human society, the consumption of energy is also increasing. The main energy supply currently comes from fossil fuels such as coal and oil. The reserves of these fossil fuels are limited, and the extensive use of fossil fuels has caused serious environmental pollution. Hydrogen is regarded as an ideal energy source in the future because of its high energy density and no polluting gases after combustion. At present, the source of hydrogen is mainly the cracking of fossil fuels and electrolysis of water. The production process is relatively complicated and the cost is high. Photocatalytic water splitting technology to produce hydrogen is a technology that uses...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B21/082C01B3/04
CPCY02E60/36
Inventor 王心晨林励华任禾
Owner FUZHOU UNIV
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