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Copolymerization-modified graphite-phase carbon nitride hollow ball visible light-driven photocatalyst

A technology of graphite phase carbon nitride and hollow spheres, applied in the direction of physical/chemical process catalysts, hydrogen production, chemical instruments and methods, etc., can solve the problems of less active sites, low quantum efficiency, small specific surface area, etc. Strong regenerative ability, high recycling rate, and the effect of increasing the specific surface area

Inactive Publication Date: 2014-06-18
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still defects that cannot be ignored: small specific surface area and few active sites, resulting in low quantum efficiency
[0004] The research work of introducing the copolymerization method into hollow sphere carbon nitride has not been reported yet.

Method used

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  • Copolymerization-modified graphite-phase carbon nitride hollow ball visible light-driven photocatalyst
  • Copolymerization-modified graphite-phase carbon nitride hollow ball visible light-driven photocatalyst
  • Copolymerization-modified graphite-phase carbon nitride hollow ball visible light-driven photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve cyanamide and 2-aminothiophene-3-carbonitrile with a mass ratio of 25:1 in an aqueous solution of 15.5 g of silica sphere sol, ultrasonicate, heat and stir at 80°C, centrifuge, and dry to obtain a white powder. In air or nitrogen atmosphere, heat preservation at 550 °C for 4 h with a heating rate of 2.3 °C / min to obtain a yellow powder. Added to 8 mol / L NH 4 HF 2 Stir in the solution for 48 h, filter, wash with water, stir for another 48 h, filter, wash with water, and vacuum-dry at 80°C to obtain copolymerized modified hollow spherical carbon nitride.

Embodiment 2

[0025] Dissolve cyanamide and 2-aminothiophene-3-carbonitrile in a mass ratio of 100:1 in an aqueous solution of 15.5 g of silica sphere sol, ultrasonicate, heat and stir at 80°C, centrifuge, and dry to obtain a white powder. Or in a nitrogen atmosphere, hold at 550°C for 4 h with a heating rate of 2.3°C / min to obtain a yellow powder. Added to 8 mol / L NH 4 HF 2 Stir in the solution for 48 h, filter, wash with water, stir for another 48 h, filter, wash with water, and vacuum-dry at 80°C to obtain copolymerized modified hollow spherical carbon nitride.

Embodiment 3

[0027] Dissolve cyanamide and 2-aminothiophene-3-carbonitrile in a mass ratio of 200:1 in an aqueous solution of 15.5 g of silica sphere sol, ultrasonicate, heat and stir at 80°C, centrifuge, and dry to obtain a white powder. Or in a nitrogen atmosphere, hold at 550°C for 4 h with a heating rate of 2.3°C / min to obtain a yellow powder. Added to 8 mol / L NH 4 HF 2 Stir in the solution for 48 h, filter, wash with water, stir for another 48 h, filter, wash with water, and vacuum-dry at 80°C to obtain copolymerized modified hollow spherical carbon nitride.

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Abstract

The invention discloses a copolymerization-modified graphite-phase carbon nitride hollow ball visible-light-driven photocatalyst as well as a preparation method and an application thereof and belongs to the technical fields of material preparation and photocatalysis. A carbon nitride hollow ball is synthetized by taking cyanamide and a small organic molecule monomer as precursors, a mesoporous silicon dioxide ball as a template and through the steps of thermal polymerization and template removing. The copolymerization-modified graphite-phase carbon nitride prepared by adopting the method disclosed by the invention is shaped like a hollow ball and is uniform in grain size and proper in band gap; compared with traditional-phase carbon nitride, the graphite-phase carbon nitride is capable of effectively increasing the specific surface area and increasing the utilization rate of sunlight and has the efficient photocatalytic hydrogen generation performance in visible light. The visible-light-driven photocatalyst disclosed by the invention is simple in synthetic process, low in cost and high in catalytic efficiency, meets the actual production requirements and has the broad application prospect in the photocatalysis field.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a copolymerized modified graphite-phase carbon nitride hollow sphere visible light catalyst and a preparation method and application thereof. Background technique [0002] Using solar energy to solve global energy and environmental problems is an important issue in the field of scientific research today. Semiconductor photocatalysts can make full use of sunlight at room temperature, have the advantages of low cost and no pollution, and are of great significance for fundamentally solving the problem of energy shortage. Over the years, researchers have been working on the development of stable and high-efficiency visible light photocatalysts, such as metal-doped SiTiO 3 , TaON, Ta 3 N 5 Polysulfides and more. However, these photocatalysts have defects such as low solar energy utilization efficiency, easy photocatalyst deactivation, lo...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/08B01J35/10C01B3/04
CPCY02E60/36
Inventor 王心晨郑丹丹
Owner FUZHOU UNIVERSITY
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