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Visible light type composite photocatalyst and preparation method thereof

A photocatalyst and catalyst technology, applied in the field of photocatalysis, can solve the problems of reducing the photocatalytic activity of visible light, easy recombination of photogenerated electrons, and small specific surface area, so as to reduce the recombination probability, improve photocatalytic efficiency, and expand the absorption range.

Active Publication Date: 2019-04-09
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

g-C 3 N 4 As a visible light catalyst, although it has a good application prospect, due to its small specific surface area, photogenerated electrons are easy to recombine, which greatly reduces its visible light photocatalytic activity and limits its practical application.

Method used

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  • Visible light type composite photocatalyst and preparation method thereof
  • Visible light type composite photocatalyst and preparation method thereof
  • Visible light type composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh strontium carbonate and melamine with a mass ratio of 1:4 in a crucible, add an appropriate amount of deionized water, and disperse them by ultrasonic for 20 minutes to make them evenly mixed. Place the ultrasonically dried samples in an oven at 80°C for 2 hours. The dried sample was placed in a muffle furnace and calcined at 520°C for 5 hours. After the calcination was completed, the sample was cooled to 90°C with the furnace and then ground with a mortar from the muffle furnace to obtain SrCO 3 / g -C 3 N 4 Composite photocatalyst, this sample is marked as Example 1. The sample obtained in this embodiment is in the form of light yellow powder. SrCO 3 with g-C 3 N 4 The mass ratio is 1:2.

Embodiment 2

[0029] Weigh strontium carbonate and melamine with a mass ratio of 1:4 in a crucible, add an appropriate amount of deionized water, and disperse them by ultrasonic for 20 minutes to make them evenly mixed. Place the ultrasonically dried samples in an oven at 80°C for 2 hours. The dried sample was placed in a muffle furnace and calcined at 550°C for 5 hours. After the calcination was completed, the sample was cooled to 90°C with the furnace and ground with a mortar from the muffle furnace to obtain SrCO 3 / g -C 3 N 4 Composite photocatalyst, this sample is marked as Example 2.

Embodiment 3

[0031] Weigh strontium carbonate and melamine with a mass ratio of 1:4 in a crucible, add an appropriate amount of deionized water, and disperse them by ultrasonic for 20 minutes to make them evenly mixed. Place the ultrasonically dried samples in an oven at 80°C for 2 hours. The dried sample was placed in a muffle furnace and calcined at 550°C for 3 hours. After the calcination was completed, the sample was cooled to 90°C with the furnace and ground with a mortar from the muffle furnace to obtain SrCO 3 / g -C 3 N 4 Composite photocatalyst, this sample is marked as Example 3.

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Abstract

The invention discloses a visible light type composite photocatalyst. The composite photocatalyst is prepared through compounding of SrCO3 and g-C3N4 and is light yellow powder; and a mass ratio of SrCO3 to g-C3N4 in the photocatalyst is 1: 0.2 to 1: 4. According to the invention, SrCO3 is introduced into g-C3N4 in a proper manner, and a heterostructure formed by g-C3N4 and SrCO3 is beneficial for separation of photon-generated carriers, reduces the recombination probability of photon-generated electrons, greatly broadens the absorption range of visible light by the composite photocatalyst and is beneficial for broadening the application scope of the composite photocatalyst.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, and relates to a composite photocatalyst with a high absorption rate for visible light and a preparation method thereof, in particular to a g-C based photocatalyst 3 N 4 composite photocatalyst. Background technique [0002] With the rapid development of science and technology, while people's living standards have been improved, the problems of environmental pollution and energy shortage are becoming increasingly serious, and it is imminent to find a quick and effective solution. Compared with the traditional chemical oxidation method and high temperature incineration method, semiconductor photocatalysis technology has become an ideal method because it can use cheap solar energy, can completely degrade pollutants in air and water under normal temperature and pressure, and has no secondary pollution. environmental governance technology. [0003] Semiconductor material g-C 3 N 4 The for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24B01J35/004C02F1/30C02F2101/40C02F2305/10
Inventor 傅敏王亚茜卢鹏
Owner CHONGQING TECH & BUSINESS UNIV
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