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Method for removing dye pollutants by utilizing silver chromate/sulfur-doped carbon nitride Z-shaped photocatalyst

A technology of photocatalyst and carbon nitride, which is applied in the field of photocatalysis, can solve the problems of poor photocatalytic performance, fast photogenerated electron-hole recombination, and low light utilization efficiency, and achieve effective removal, convenient operation, and efficient degradation.

Active Publication Date: 2018-12-07
HUNAN UNIV
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Problems solved by technology

However, the photocatalysts used in photocatalytic degradation have the following problems: low light utilization efficiency, fast photogenerated electron-hole recombination, poor photocatalytic performance, etc. Due to the large number of defects in the photocatalyst itself, the wide application of photocatalytic degradation is greatly limited.
Doping with non-metallic sulfur element is a safe and effective doping method, which can improve the g-C 3 N 4 The electronic structure plays an important role, but the existing sulfur-doped carbon nitride synthesis process is cumbersome and complicated, and other substances N,N-dimethylformamide are introduced, which may introduce oxygen elements, which will be detrimental to the performance of the catalyst. influences
In addition, silver chromate (Ag 2 CrO 4 ) is a silver-based semiconductor photocatalyst. Its small energy gap (1.7 eV) can respond well to visible light and increase the absorption of visible light by photocatalysts. However, by constructing Ag 2 CrO 4 / g -C 3 N 4 The heterojunction structure still cannot effectively improve the structural and optical properties of carbon nitride, making it difficult to improve the performance of the catalyst, which severely limits the practical application of photocatalysts.
Therefore, how to comprehensively improve the existing problems and defects in the existing photocatalytic degradation technology, and obtain a photocatalytic material with strong light absorption ability, low photogenerated electron-hole recombination rate, and good photocatalytic performance to achieve rapid degradation of dye pollutants. , high-efficiency treatment, which is of great significance for expanding the application range of photocatalytic degradation technology in the treatment of dye pollutants

Method used

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  • Method for removing dye pollutants by utilizing silver chromate/sulfur-doped carbon nitride Z-shaped photocatalyst
  • Method for removing dye pollutants by utilizing silver chromate/sulfur-doped carbon nitride Z-shaped photocatalyst
  • Method for removing dye pollutants by utilizing silver chromate/sulfur-doped carbon nitride Z-shaped photocatalyst

Examples

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Embodiment 1

[0047] A method for removing dye pollutants by using silver chromate / sulfur-doped carbon nitride Z-type photocatalyst, specifically using silver chromate / sulfur-doped carbon nitride Z-type photocatalyst to remove dye pollutants (methyl orange ) for catalytic treatment, comprising the following steps:

[0048] Take silver chromate / sulfur-doped carbon nitride Z-type photocatalyst (ASCN-10, ASCN-20, ASCN-30, ASCN-40), sulfur-doped carbon nitride (SCN) and silver chromate (Ag 2 CrO 4 ), 20 mg each, were added to 50 mL of methyl orange (MO) solution with a concentration of 15 mg / L, mixed evenly, and methyl orange (MO) was adsorbed at 30°C and 600 rpm, and after 30 min Adsorption equilibrium is reached; the mixed solution that has reached the adsorption equilibrium is placed under a xenon lamp (power 45W, λ > 420 nm), and the photocatalytic reaction is carried out at 30°C and 600 rpm for 20 minutes to complete the treatment of methyl orange .

[0049] In this example, the silver ...

Embodiment 2

[0072] A method for removing dye pollutants by using silver chromate / sulfur-doped carbon nitride Z-type photocatalyst, specifically to investigate the effect of silver chromate / sulfur-doped carbon nitride Z-type photocatalyst on the catalytic removal of dye pollutants (methyl orange), including the following steps:

[0073] (1) Take the silver chromate / sulfur-doped carbon nitride Z-type photocatalyst (ASCN-30) and silver chromate (Ag 2 CrO 4 ), 20 mg each, were added to 50 mL of methyl orange (MO) solution with a concentration of 15 mg / L, mixed evenly, and methyl orange (MO) was adsorbed at 30°C and 600 rpm, and after 30 min Adsorption equilibrium was reached; the mixed solution that reached the adsorption equilibrium was placed under a xenon lamp (power 45W, λ > 420 nm), and the photocatalytic reaction was carried out at 30°C and 600 rpm for 20 minutes to complete the treatment of methyl orange.

[0074] (2) After the treatment in step (1), centrifuge the mixture obtained a...

Embodiment 3

[0077] A method for removing dye pollutants by using silver chromate / sulfur-doped carbon nitride Z-type photocatalyst, specifically to investigate the effect of silver chromate / sulfur-doped carbon nitride Z-type photocatalyst on the catalytic removal of dye pollutants (methyl The generation of free radicals in the process of orange), including the following steps:

[0078] (1) Take 3 parts of the silver chromate / sulfur-doped carbon nitride Z-type photocatalyst (ASCN-30) prepared in Example 1, 20 mg each, and add them to 50 mL of methyl Orange (MO) solution, mixed evenly, adsorbed methyl orange (MO) at 30 °C, 600 rpm, and reached adsorption equilibrium after 30 min.

[0079] (2) Add 0.1 mL of trihydroxyethylamine (TEOA) to the three mixtures obtained in step (1) after reaching adsorption equilibrium, which is used to capture h + ), 0.1 g p-benzoquinone (PBQ, for capturing O 2 − ) and 0.1 mL of isopropanol (IPA, for capturing OH).

[0080] (3) Put the mixtures obtained in st...

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Abstract

The invention discloses a method for removing dye pollutants by utilizing a silver chromate / sulfur-doped carbon nitride Z-shaped photocatalyst. According to the method, the silver chromate / sulfur-doped carbon nitride Z-shaped photocatalyst is utilized to catalytically treat the dye pollutants, wherein the silver chromate / sulfur-doped carbon nitride Z-shaped photocatalyst comprises carbon nitride,sulfur-doped carbon nitride is formed by doping sulfur elements into the carbon nitride and the surface of the sulfur-doped carbon nitride is modified with silver chromate. According to the invention,the dye pollutants can be degraded into carbon dioxide and water, in the manner of adopting the silver chromate / sulfur-doped carbon nitride Z-shaped photocatalyst for catalytically treating the dye pollutants, so as to realize the effective removal of the dye pollutants. The method disclosed by the invention has the advantages of simple process, convenience in operation, high treating efficiency,excellent removing effect, and the like, has high application value and wide application scope and is suitable for large-scale application.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a method for removing dye pollutants by using silver chromate / sulfur-doped carbon nitride Z-type photocatalyst. Background technique [0002] Dyestuff refers to a class of organic compounds that can make other substances obtain bright and firm colors. It is widely used in textile and other industries. Due to its excessive use and incomplete treatment, a large amount of it enters the environment, especially for the water environment. These dyes entering the environmental system greatly affect the development of the ecosystem and also have adverse effects on human health. Methods for removing dye pollutants, including filtration, adsorption, advanced oxidation, biodegradation, photocatalytic degradation, etc., where filtration and adsorption methods only transfer pollutants from one phase to another, and cannot mineralize them into carbon dioxide and water; although the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/10C02F1/30
CPCC02F1/30B01J27/24C02F2305/10C02F2101/308B01J35/00B01J35/30B01J35/60B01J35/39B01J35/61
Inventor 邵彬彬蒋艺林刘智峰刘小娟梁清华刘玉杰张魏何青云曾光明
Owner HUNAN UNIV
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