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Preparation method of sulfur doped graphite-phase carbon nitride visible-light catalyst and product obtained by using method

A graphitic carbon nitride, visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of limited improvement in photocatalytic activity for degrading pollutants, and achieve excellent photocatalysis. Performance and stability, environmental friendliness, short cycle effects

Active Publication Date: 2014-09-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned modified visible light catalyst effectively increases the specific surface area of ​​graphitic carbon nitride, provides more active sites, and improves its utilization rate of visible light, but the improvement in photocatalytic activity for degrading pollutants is limited.

Method used

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  • Preparation method of sulfur doped graphite-phase carbon nitride visible-light catalyst and product obtained by using method
  • Preparation method of sulfur doped graphite-phase carbon nitride visible-light catalyst and product obtained by using method

Examples

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Embodiment 1

[0024] The preparation method of the sulfur-doped graphite phase carbon nitride visible light catalyst comprises the following steps:

[0025] (1) Dispersing 2g of sulfur powder in 6g of cyanamide aqueous solution with a mass concentration of 50%, fully mixing the two for 60min;

[0026] (2) Place the mixed solution obtained in step (1) in a crucible, cover the crucible lid, put it into a tube furnace, heat up from room temperature to 550°C at a rate of 10°C / min through programmed temperature rise, and heat at a constant temperature for 2h. polycondensation reaction occurs;

[0027] (3) The polycondensation reaction product of step (2) is naturally cooled, washed repeatedly with absolute ethanol and distilled water to remove the by-product ammonium salt, freeze-dried for 24 hours and ground for 1 hour to obtain a sulfur-doped graphite phase carbon nitride visible light catalyst, sulfur element The doping amount accounts for 0.45% by mass of the sulfur-doped graphite phase car...

Embodiment 2

[0031] The present embodiment is different from embodiment 1 in that: the quality of sulfur powder used is 3g. Other steps, parameters and visible light catalysis experimental operation are the same as in Example 1. The doping amount of sulfur in the sulfur-doped graphite phase carbon nitride visible light catalyst prepared in this example accounts for 0.60% by mass of the sulfur doped graphite phase carbon nitride visible light catalyst. The photocatalytic degradation rate of rhodamine B by sulfur-doped graphitic carbon nitride visible light catalyst was 72.3%.

Embodiment 3

[0033] The present embodiment is different from embodiment 1 in that: the quality of sulfur powder used is 0.6g. Other steps, parameters and visible light catalysis experimental operation are the same as in Example 1. The doping amount of sulfur element in the sulfur-doped graphite phase carbon nitride visible light catalyst prepared in this example accounts for 0.25% by mass of the sulfur doped graphite phase carbon nitride visible light catalyst. The photocatalytic degradation rate of rhodamine B by sulfur-doped graphitic carbon nitride visible light catalyst was 51.3%.

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Abstract

The invention discloses a preparation method of a sulfur doped graphite-phase carbon nitride visible-light catalyst. The preparation method comprises the following steps: dispersing sulfur powder into a water solution of cyanamide, and fully mixing; heating the mixed solution by virtue of a procedure at constant temperature, so as to generate a condensation reaction; and naturally cooling a product from the condensation reaction, washing, drying and grinding to obtain the sulfur doped graphite-phase carbon nitride visible-light catalyst. The invention further discloses the sulfur doped graphite-phase carbon nitride visible-light catalyst which is obtained by using the preparation method, and the sulfur element doping content accounts for 0.1wt% to 0.6wt% of the sulfur doped graphite-phase carbon nitride visible-light catalyst. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period, environment friendliness and the like, no complex equipment is needed, the preparation method can be suitable for industrial mass production, and the prepared sulfur doped graphite-phase carbon nitride visible-light catalyst has excellent photocatalytic performance and stability.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation for environmental purification, and relates to a method for preparing a sulfur-doped graphite phase carbon nitride visible light catalyst and a product obtained by the method. Background technique [0002] Photocatalytic technology is a green technology with important application prospects in the field of pollution control. It uses semiconductors as catalysts and light energy as energy to convert pollutants into carbon dioxide and water. In recent years, scholars at home and abroad have conducted in-depth research on non-metallic semiconductor materials such as sulfides and nitrides, but the problems of low quantum efficiency of photocatalysts and low utilization of sunlight have not been fundamentally resolved, which restricts photocatalytic technology. wide application. Therefore, there is an urgent need to develop new visible light-induced high-efficiency photocatalytic mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 冯雷雨张唯孙寒黄祖璟陈银广
Owner TONGJI UNIV
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