Photocatalyst for treating dye in high-salt wastewater and preparation method thereof

Abstract

The invention discloses a photocatalyst for treating dyes in high-salt wastewater and a preparation method thereof, and belongs to the field of photocatalysis. The photocatalyst of the present invention uses porous graphite phase carbonized nitrogen nanosheets as a carrier, and the porous graphite phase carbonized nitrogen nanosheets carrier is loaded with bismuth oxycarbonate nanoparticles. The catalyst obtained by the invention can catalytically treat dyes in high-salt wastewater under visible light, and has the advantages of response under visible light, low cost and high degradation rate. In the preparation process of the catalyst, graphite phase carbonized nitrogen after hydrothermal treatment is used, directly ground and roasted with bismuth nitrate, so that bismuth oxycarbonate particles can be generated in situ on the surface of the carbonized nitrogen carrier, and the strong interaction between the two is used to improve the optical efficiency. Catalytic reaction stability of the catalyst. In addition, no organic solvent is introduced during the preparation process, which is environmentally friendly, has a simple process, and is conducive to industrial production.

Description

technical field

[0001] The invention relates to the field of photocatalysis, in particular to a photocatalyst for treating dyes in high-salt wastewater and a preparation method thereof. Background technique

[0002] With the rapid development of textile industrialization, the discharge of a large amount of printing and dyeing wastewater seriously threatens the natural environment and human health. Printing and dyeing wastewater has the characteristics of deep color, strong toxicity, refractory degradation, large pH fluctuations, etc., and often has a high content of inorganic salts, and it is difficult to effectively treat it by conventional methods.

[0003] In recent years, photocatalytic oxidation, as a deep oxidation method, has been recognized as the most promising pollutant removal technology due to its low energy consumption, mild reaction conditions, simple operation, and low cost. TiO 2 Photocatalyst has the advantages of cheap, non-toxic, high activity, etc., but...

Examples

Embodiment 1

[0033] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 400°C at a rate of 1°C / min, keep it for 100 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mixed with deionized water (the mass percentage of water is 99.5%), ultrasonicated at room temperature for 0.5h, poured into a hydrothermal kettle, heated at 120°C for 6h, cooled to room temperature and centrifuged, and the obtained solid matter was Dry in an oven at 40°C for 5 hours to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:4×10 -4 ) for grinding, and then put it into a crucible with a lid, raise the temperature to 400°C at a heating rate of 1°C / min, keep it for 3h, and then cool to room temperature to obtain the optical fiber of bismuth oxycarbonate nanoparticles supported by porous graphite nitrogen carbide nanosheets. catalyst.

[0034] Depend on figure 1 It can be seen that through the detection of ...

Embodiment 2

[0039] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 600 °C at a rate of 5 °C / min, keep it for 500 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mix with deionized water (the mass percentage of water is 98.5%), after ultrasonication at room temperature for 3 hours, pour it into a hydrothermal kettle, heat at 240°C for 30 hours, cool to room temperature and centrifuge, and put the obtained solid matter in an oven Dry at 100°C for 30h to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:4×10 -2) for grinding, and then put it into a crucible with a lid, raise the temperature to 600°C at a heating rate of 5°C / min, keep it for 6h, and cool to room temperature to obtain porous graphite nitrogen carbide nanosheets loaded with bismuth oxycarbonate nanoparticles catalyst of light.

[0040] Evaluation conditions: In 40 mg / L high-salt dye wastewater containing methyl...

Embodiment 3

[0042] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 530 °C at a rate of 2.5 °C / min, keep it for 200 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mix with deionized water (the mass percentage of water is 99.0%), after ultrasonication at room temperature for 1h, pour into a hydrothermal kettle, heat at 180°C for 12h, cool to room temperature and centrifuge, and put the obtained solid matter in an oven Dry at 70°C for 10 hours to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:8×10 -3 ) for grinding, and then put it into a crucible with a lid, raise the temperature to 500°C at a heating rate of 2.5°C / min, keep it for 4h, and then cool to room temperature to obtain porous graphite nitrogen carbide nanosheets loaded with bismuth oxycarbonate nanoparticles catalyst of light.

[0043] Evaluation conditions: In high-salt dye wastewater containing 20 mg / L rhoda...

technical field

[0001] The invention relates to the field of photocatalysis, in particular to a photocatalyst for treating dyes in high-salt wastewater and a preparation method thereof. Background technique

[0002] With the rapid development of textile industrialization, the discharge of a large amount of printing and dyeing wastewater seriously threatens the natural environment and human health. Printing and dyeing wastewater has the characteristics of deep color, strong toxicity, refractory degradation, large pH fluctuations, etc., and often has a high content of inorganic salts, and it is difficult to effectively treat it by conventional methods.

[0003] In recent years, photocatalytic oxidation, as a deep oxidation method, has been recognized as the most promising pollutant removal technology due to its low energy consumption, mild reaction conditions, simple operation, and low cost. TiO 2 Photocatalyst has the advantages of cheap, non-toxic, high activity, etc., but...

Examples

Embodiment 1

[0033] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 400°C at a rate of 1°C / min, keep it for 100 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mixed with deionized water (the mass percentage of water is 99.5%), ultrasonicated at room temperature for 0.5h, poured into a hydrothermal kettle, heated at 120°C for 6h, cooled to room temperature and centrifuged, and the obtained solid matter was Dry in an oven at 40°C for 5 hours to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:4×10 -4 ) for grinding, and then put it into a crucible with a lid, raise the temperature to 400°C at a heating rate of 1°C / min, keep it for 3h, and then cool to room temperature to obtain the optical fiber of bismuth oxycarbonate nanoparticles supported by porous graphite nitrogen carbide nanosheets. catalyst.

[0034] Depend on figure 1 It can be seen that through the detection of ...

Embodiment 2

[0039] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 600 °C at a rate of 5 °C / min, keep it for 500 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mix with deionized water (the mass percentage of water is 98.5%), after ultrasonication at room temperature for 3 hours, pour it into a hydrothermal kettle, heat at 240°C for 30 hours, cool to room temperature and centrifuge, and put the obtained solid matter in an oven Dry at 100°C for 30h to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:4×10 -2) for grinding, and then put it into a crucible with a lid, raise the temperature to 600°C at a heating rate of 5°C / min, keep it for 6h, and cool to room temperature to obtain porous graphite nitrogen carbide nanosheets loaded with bismuth oxycarbonate nanoparticles catalyst of light.

[0040] Evaluation conditions: In 40 mg / L high-salt dye wastewater containing methyl...

Embodiment 3

[0042] Put melamine into a crucible with a lid, place it in a muffle furnace, raise the temperature to 530 °C at a rate of 2.5 °C / min, keep it for 200 min, and cool it to room temperature to obtain a yellow powder; then mix it with a certain amount of Mix with deionized water (the mass percentage of water is 99.0%), after ultrasonication at room temperature for 1h, pour into a hydrothermal kettle, heat at 180°C for 12h, cool to room temperature and centrifuge, and put the obtained solid matter in an oven Dry at 70°C for 10 hours to obtain a khaki solid; then mix with bismuth nitrate (molar ratio 1:8×10 -3 ) for grinding, and then put it into a crucible with a lid, raise the temperature to 500°C at a heating rate of 2.5°C / min, keep it for 4h, and then cool to room temperature to obtain porous graphite nitrogen carbide nanosheets loaded with bismuth oxycarbonate nanoparticles catalyst of light.

[0043] Evaluation conditions: In high-salt dye wastewater containing 20 mg / L rhoda...

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