Nitride catalyst for efficient photocatalytic reduction of nitrate in water and water treatment method thereof

A technology of nitrides and catalysts, which is applied in the field of nitride catalysts for efficient photocatalytic reduction of nitrate in water and its water treatment, can solve problems such as difficulty in meeting the demand for nitrate removal in water, secondary pollution, and easy deactivation of catalysts. Achieve excellent chemical stability, mild reaction conditions, and improve removal performance

Active Publication Date: 2019-04-16
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods to remove nitrate in water require high treatment costs and cannot be completely removed
Although the chemical method to remove nitrate in water has the advantages of rapid reaction and easy operation, there are problems such as easy deactivation of the catalyst, secondary pollution, and high price.
The biological denitrification method can completely reduce nitrate to harmless nitrogen, but it has the disadvantages of low impact load resistance, secondary pollution, and complicated process.
Therefore, conventional treatment methods are difficult to meet the demand for nitrate removal in water.

Method used

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  • Nitride catalyst for efficient photocatalytic reduction of nitrate in water and water treatment method thereof
  • Nitride catalyst for efficient photocatalytic reduction of nitrate in water and water treatment method thereof
  • Nitride catalyst for efficient photocatalytic reduction of nitrate in water and water treatment method thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] Step (1): prepare transition type nitride catalyst by alcohol thermal method;

[0026] ① At room temperature, take 1 mL of titanyl sulfate, slowly add it to a solution dissolved in 10 mL of glycerol, 20 mL of ethanol and about 8 mL of ether, and stir for 10 minutes to obtain a clear and uniform solution.

[0027] ② Transfer the mixed solution to a 50mL polytetrafluoroethylene hydrothermal kettle and place it in an oven at 110°C for aging for 1h.

[0028] ③ After the hydrothermal kettle is cooled, the sample is centrifuged, washed several times with ethanol, dried under vacuum at 80°C and collected for later use.

[0029] ④The above-mentioned titanium nitride precursor was calcined at 1300°C for 15 hours at a heating rate of 5°C / min in nitrogen. A transition type nitride titanium nitride is obtained.

[0030] Step (2): photocatalytic reduction of nitrate in water;

[0031] Potassium nitrate was used as the source of nitrate. Weigh 0.08g of the catalyst with an electr...

specific Embodiment approach 2

[0033] The difference between this embodiment and specific embodiment 1 is: the catalyst for photocatalytic reduction of nitrate in water in step (1) is covalent nitride B prepared by roasting method x N y (x=0, y=0).

[0034] ①Weigh a certain amount of boric acid and melamine in a beaker, dissolve in 250mL deionized water, heat and stir in a water bath at 90°C, crystallize by evaporation or cooling for 12 hours, and obtain a white gel-like substance.

[0035] ② Filter with a Buchner funnel and wash with deionized water for 3-5 times.

[0036] ③The obtained white solid was dried in a constant temperature drying oven at 60°C for 6-8 hours, and then ground to obtain a white powdery precursor.

[0037] ④Put the ground precursor in an alumina crucible and put it into a tube furnace for two-stage calcination: the first stage is to increase the temperature from room temperature to 600°C at a rate of 4°C / min, and keep it for 2 hours; In the second stage, the temperature is raised ...

specific Embodiment approach 3

[0040]The difference between this embodiment and the first embodiment is that the catalyst for the photocatalytic reduction of nitrate in water in step (1) is a nitride with a different shape.

[0041] ① At room temperature, take 1 mL of titanyl sulfate, slowly add it to a solution dissolved in 10 mL of glycerol, 20 mL of ethanol and about 8 mL of ether, and stir for 10 minutes to obtain a clear and uniform solution.

[0042] ② Transfer the mixed solution to a 50mL polytetrafluoroethylene hydrothermal kettle, and place it in an oven at 110°C for aging for 1h, 2d, and 7d (1h is a spherical structure, 2d is a core-shell structure, and 7d is an empty-shell structure).

[0043] ③ After the hydrothermal kettle is cooled, the sample is centrifuged, washed several times with ethanol, dried under vacuum at 80°C and collected for later use.

[0044] ④The above-mentioned titanium nitride precursor was calcined at 1300°C for 15 hours at a heating rate of 5°C / min in nitrogen. TiNs with d...

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Abstract

The invention belongs to the field of nitrate reduction in water, and particularly relates to a nitride catalyst for efficient photocatalytic reduction of nitrate in water and a water treatment methodthereof. The method comprises the following steps of preparing the nitride catalyst for the photocatalytic reduction of the nitrate in the water by adopting different methods; putting the prepared catalyst into nitrate-containing industrial wastewater to be treated, and conducting photocatalytic reduction of the nitrate in the water under ultraviolet light irradiation. The catalyst for the photocatalytic reduction of the nitrate in the water is a nitride type, and includes transition type nitride, covalent type nitride, nitride of different morphologies, defect nitride, nitride loaded with ametal and a metal quantum dot, a composite of nitride and a metal oxide and nitride loaded on different carriers. The method has the advantages of simple equipment, easy control, mild reaction conditions and the like; the prepared nitride catalyst can efficiently and stably remove the nitrate in sewage, and have good stability.

Description

technical field [0001] The invention belongs to the field of nitrate reduction in water, and in particular relates to a nitrogen compound catalyst for highly efficient photocatalytic reduction of nitrate in water and a water treatment method thereof. Background technique [0002] As an important part of the nitrogen cycle, nitrate is ubiquitous in the aquatic environment. However, due to human activities and climate change, nitrogen emissions have increased, leading to an increase in the concentration of nitrate in the water environment year by year, and the range of moderate and severe pollution in the water environment is increasing year by year. Excessive nitrate content in water will not only cause eutrophication and damage the aquatic ecosystem, but also be converted into carcinogen-nitrite, which poses a serious threat to organisms and may affect human health through the food chain. Since nitrate is a stable anion, it is difficult to remove it by conventional treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/08C02F1/30C02F1/70C02F101/16
CPCC02F1/30C02F1/70B01J27/24B01J35/004B01J35/023B01J35/08C02F2101/163
Inventor 任月明姜翠双李霄马军冯静王若男张翔宇于树泉
Owner HARBIN ENG UNIV
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