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Carbon nitride hollow sphere photocatalyst, preparation method and application thereof

A technology of photocatalyst and hollow sphere, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of simplifying the synthesis process, good photocatalytic performance, reducing environmental pollution and cost

Inactive Publication Date: 2017-04-26
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, implementing g-C with a suitable method 3 N 4 The controllable preparation of hollow spheres (band gap, light absorption, particle size, etc.) and their application in the field of photolysis of water for hydrogen production have not been reported yet.

Method used

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  • Carbon nitride hollow sphere photocatalyst, preparation method and application thereof
  • Carbon nitride hollow sphere photocatalyst, preparation method and application thereof
  • Carbon nitride hollow sphere photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Disperse cyanuric chloride and dicyanuric amine (mass ratio: 1:0.34) in acetonitrile (the ratio of cyanuric chloride to acetonitrile is 1g: 22mL), and stir the mixture at room temperature for 12h at a speed of 500r / min. The mixture was transferred to a hydrothermal reactor and heat-treated at a constant temperature of 180 °C for 72 h. Naturally cooled to room temperature, the resulting solid precipitate was collected by centrifugation, washed twice with absolute ethanol, and then washed with distilled water. The washed precipitate was dried at a temperature of 50° C. for 12 hours to obtain a dried precipitate to obtain a carbon nitride hollow sphere photocatalyst.

Embodiment 2

[0045] Disperse cyanuric chloride and dicyanuric amine (mass ratio: 1:0.34) in acetonitrile (the ratio of cyanuric chloride to acetonitrile is 1g: 22mL), and stir the mixture at room temperature for 12h at a speed of 500r / min. The mixed solution was transferred to a hydrothermal reactor and heat-treated at a constant temperature of 180° C. for 96 h. Naturally cooled to room temperature, the resulting solid precipitate was collected by centrifugation, washed twice with absolute ethanol, and then washed with distilled water. The washed precipitate was dried at a temperature of 90° C. for 6 hours to obtain a dried precipitate, which was a carbon nitride hollow sphere photocatalyst.

Embodiment 3

[0047] Disperse cyanuric chloride and dicyanuric amine (mass ratio 1:0.34) in acetonitrile (the ratio of cyanuric chloride to acetonitrile is 1g: 20mL), and stir the mixture under reflux at 70°C for 6 hours at a controlled speed. 600r / min. The mixed solution was transferred to a hydrothermal reactor and heat-treated at a constant temperature of 180° C. for 48 h. Naturally cooled to room temperature, the resulting solid precipitate was collected by centrifugation, washed twice with absolute ethanol, and then washed with distilled water. The washed precipitate was dried at a temperature of 70° C. for 10 h to obtain a dried precipitate, which was a carbon nitride hollow sphere photocatalyst.

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Abstract

The invention belongs to the technical field of material preparation and solar energy photocatalysis and especially provides a carbon nitride hollow sphere photocatalyst, a preparation method and an application thereof. In the invention, a thermal fluid is used as a reaction medium, so that by means of a solvent action of the fluid under a subcritical status, reaction activity of a precursor is increased, and growth of a product is directly controlled at a low temperature to prepare the hollow sphere granules. The method solves the dependency on a template agent in a template-calcination technology in the prior art, which has the problems that high temperature calcination and corrosive removal of the template may cause collapse of the hollow structure and the product is low in light absorption range. The method achieves self-polymerization of a triazine ring monomer into the carbon nitride hollow sphere photocatalyst under a mild condition. By regulating the reaction parameters, polymerization degree is effectively changed, thereby controlling the physical and chemical properties of the product.

Description

technical field [0001] The invention belongs to the technical field of material preparation and solar photocatalysis, and specifically relates to a method for preparing a photocatalyst for solvothermal synthesis of graphite-phase carbon nitride hollow spheres in a subcritical state and an application in photocatalysis technology. Background technique [0002] Energy shortage is a major problem facing human society at present, and green and efficient solar photocatalysis technology is expected to make a breakthrough in solving this problem. In the process of developing photocatalytic technology, it is the key to explore and develop efficient and practical photocatalyst materials that are pollution-free, cheap, stable and widely used. [0003] The non-metallic polymer semiconductor graphitic carbon nitride was introduced into the field of photocatalysis research in 2009 (Nat. Mater. 2009, 8, 76-80), which can use light energy to photolyze water to produce hydrogen. However, b...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/08B01J35/10
CPCB01J27/24B01J35/39B01J35/612B01J35/51B01J35/613
Inventor 崔言娟王愉雄王浩陈芳艳
Owner JIANGSU UNIV OF SCI & TECH
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