Compound photocatalyst Ag2CO3/g-C3N4 as well as preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of low catalytic efficiency, low quantum efficiency, high photogenerated electron-hole recombination rate, etc.

Inactive Publication Date: 2018-02-13
FUYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] g-C 3 N 4 With its outstanding advantages of high photocatalytic activity, good stability, cheap raw materials, and especially no metal, it has become a new type of photocatalytic material. However, single-phase catalysts usually hav

Method used

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  • Compound photocatalyst Ag2CO3/g-C3N4 as well as preparation method and application thereof
  • Compound photocatalyst Ag2CO3/g-C3N4 as well as preparation method and application thereof
  • Compound photocatalyst Ag2CO3/g-C3N4 as well as preparation method and application thereof

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preparation example Construction

[0018] A composite photocatalyst Ag 2 CO 3 / g -C 3 N 4 The preparation method, this method comprises the following steps:

[0019] Step (1), calcining nitrogen-containing organic matter, cooling to obtain product I, which is g-C 3 N 4 .

[0020] Since no natural g-C has been found so far 3 N 4 Crystal structure, so the application of his research requires laboratory synthesis. The commonly used synthetic methods are: high temperature and high pressure method, deposition method, solvothermal method and thermal polymerization method. Since the thermal polymerization method can be conveniently adjusted by adding other substances or changing the reaction conditions, g-C 3 N 4 crystal structure, thereby enhancing the g-C 3 N 4 The photocatalytic performance is currently commonly used for thermal polymerization and calcined synthesis.

[0021] In the present invention, the calcination is carried out at 300-800°C, preferably at different temperatures in stages, more pref...

Embodiment 1

[0058] Accurately weigh 5.0000g of melamine with an electronic balance, put the weighed medicine in a crucible, then place the crucible in a muffle furnace, set the temperature at 500°C for two hours, and continue to calcine at 520°C for two hours. Take out the medicine and cool it to room temperature, and after grinding, you will get bright yellow g-C 3 N 4 sample.

[0059] Accurately weigh 0.3036g of the prepared g-C with an electronic balance 3 N 4 Disperse in 8ml of deionized water, then sonicate for 30min. The 2ml concentration is 0.11mol L -1 The silver nitrate solution was added to the above-mentioned sonicated solution, and stirred for 30 minutes in the dark.

[0060] Continue to add 5ml 0.05mol·L -1 NaHCO 3 The solution was in the above suspension, and stirred for 2 h in the dark. The precipitate was first collected by centrifugation, then washed with deionized water and absolute ethanol, and dried in a drying oven at 60° C. for 4 h. Cool to room temperature,...

Embodiment 2

[0062] Accurately weigh 5.0000g of melamine with an electronic balance, put the weighed medicine in a crucible, then place the crucible in a muffle furnace, set the temperature at 500°C for two hours, and continue to calcine at 520°C for two hours. Take out the medicine and cool it to room temperature, and after grinding, you will get bright yellow g-C 3 N 4 sample.

[0063] Accurately weigh 0.1518g of the prepared g-C with an electronic balance 3 N 4 Disperse in 8ml of deionized water, then sonicate for 30min. The 2ml concentration is 0.11mol L -1 The silver nitrate solution was added to the above-mentioned sonicated solution, and stirred for 30 minutes in the dark.

[0064] Continue to add 5ml 0.05mol·L -1 NaHCO 3 The solution was in the above suspension, and stirred for 2 h in the dark. The precipitate was first collected by centrifugation, then washed with deionized water and absolute ethanol, and dried in a drying oven at 60° C. for 4 h. Cool to room temperature,...

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Abstract

The invention relates to a preparation method of Ag2CO3/g-C3N4. According to the preparation method, a nitrogen-containing organic matter, a silver salt solution and a silver precipitant are used as precursors and are roasted to prepare g-C3N4; then the g-C3N4 is precipitated to prepare Ag2CO3; then an Ag2CO3/g-C3N4 compound photocatalyst is prepared and is characterized through X-ray diffraction(XRD), infrared spectrum (IR), ultraviolet-visual diffuser reflectance (UV-Vis DRS), photoluminescence spectrum (PL) and the like. The invention further relates to application of the prepared catalyst; methyl orange is used as a model compound of photocatalytic reaction and the photocatalytic activity of the catalyst is evaluated.

Description

technical field [0001] The invention relates to a novel composite photocatalyst for treating dye wastewater pollution and a preparation method thereof, belonging to the field of photocatalysis. Background technique [0002] g-C 3 N 4 With its outstanding advantages of high photocatalytic activity, good stability, cheap raw materials, and especially no metal, it has become a new type of photocatalytic material. However, single-phase catalysts usually have low quantum efficiency. The photocatalytic performance is not ideal. [0003] Ing-C 3 N 4 The high photogenerated electron-hole recombination rate of the material leads to low catalytic efficiency, which limits its application in photocatalysis. To improve g-C 3 N 4 In recent years, many modification methods have been studied. to g-C 3 N 4 The modified non-metallic elements include S, N, C, B, F, P, etc. It is generally believed that these non-metallic elements replace the C, N, and H elements in the 3-s-triazine s...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/38
CPCB01J27/24B01J35/004C02F1/30C02F2101/308C02F2101/38
Inventor 崔玉民李慧泉白翠冰苗慧
Owner FUYANG NORMAL UNIVERSITY
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