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A kind of visible light catalytic degradation method of thiocyanate in wastewater

A thiocyanate, catalytic degradation technology, applied in chemical instruments and methods, light water/sewage treatment, physical/chemical process catalysts, etc., can solve the problem of transferring to another place or another stage, harmful to aquatic animals and plants, human Health threats and other issues, to achieve the effect of increasing light energy utilization, increasing transmittance, and promoting light energy utilization

Active Publication Date: 2022-05-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Thiocyanate is a typical halogen-like substance with good complexing properties, and is widely present in industrial wastewater such as cyanidation gold leaching, electroplating, and coking; although thiocyanate is less toxic than cyanide, when its mass concentration When it is higher than 5mg / L, it will inhibit the growth of bacteria. When the mass concentration of thiocyanate in human blood is as high as 100-150mg / L, it will be life-threatening; thiocyanide is harmful to aquatic animals and plants. At the same time, thiocyanate has a strong Stability, not easy to degrade naturally
The traditional methods of treating thiocyanate are generally natural adsorption, ion exchange, biodegradation and other methods; these methods just transfer the pollutants to another place or another stage, which can easily cause secondary pollution and pose a serious threat to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Sodium sulfate, titanium dioxide powder and urea are mixed in a mass ratio of 3:80:7 to make a mixed material;

[0030] Put the mixed material and grinding balls in the grinding tank, then add dispersant and absolute ethanol, and then use a planetary high-energy ball mill for high-energy ball milling. The revolution speed of the high-energy ball mill is 300rpm, and the ratio of revolution speed to rotation speed is 1:2.5 , the high-energy ball mill mixing time is 4h, the material mixed by the high-energy ball mill is taken out, cooled to normal temperature, and the ball mill powder is obtained; the dispersant is stearic acid, and the addition amount is 1% of the mass of the mixture material; the addition amount of absolute ethanol is the mixture 40% of the mass of the material; the mass ratio of the mixed material to the ball is 1:15;

[0031] Immerse the ball mill powder in water at a temperature of 25-30°C, then apply ultrasonic treatment for 20 minutes, then take it ...

Embodiment 2

[0036] Method is with embodiment 1, and difference is:

[0037] (1) the mass ratio of sodium sulfate, titanium dioxide powder and urea is 5:77:8;

[0038] (2) When the high-energy ball mill is mixing, the revolution speed is 400rpm, the ratio of revolution speed and rotation speed is 1:2, and the high-energy ball mill mixing time is 6h; the addition of dispersant is 2% of the mass of the mixture; the addition of absolute ethanol is 50% of the mass; the mass ratio of the mixed material to the ball is 1:10;

[0039] (3) Ultrasonic treatment for 25 minutes; drying time for 13 hours;

[0040] (4) The concentration of thiocyanate in the solution containing thiocyanate is 30 mg / L; the pH value is adjusted to 9; the pulp is left to stand for 40 minutes under dark conditions, and the photocatalytic degradation time is 120 minutes. The degradation rate of acid radical was 67.9%.

Embodiment 3

[0042] Method is with embodiment 1, and difference is:

[0043] (1) The mass ratio of sodium sulfate, titanium dioxide powder and urea is 10:70:10;

[0044] (2) When the high-energy ball mill is mixing, the revolution speed is 500rpm, the ratio of revolution speed and rotation speed is 1:3, and the high-energy ball mill mixing time is 5h; the addition of dispersant is 3% of the mass of the mixture; the addition of absolute ethanol is 60% of the mass; the mass ratio of the mixed material to the ball is 1:8;

[0045] (3) Ultrasonic treatment for 25 minutes; drying time for 14 hours;

[0046] (4) The concentration of thiocyanate in the solution containing thiocyanate is 60 mg / L; adjust the pH value to 10; the pulp is left to stand for 30 minutes under dark conditions, and the photocatalytic degradation time is 180 minutes. The degradation rate of acid radical was 77.8%.

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Abstract

A method for visible light catalytic degradation of thiocyanate in wastewater, comprising the following steps: (1) mixing sodium sulfate, titanium dioxide powder and urea to prepare a mixed material; (2) placing in a grinding tank, adding a dispersant and absolute ethanol , using a planetary high-energy ball mill for high-energy ball milling and mixing, and cooling to normal temperature; (3) The ball mill powder is immersed in water and subjected to ultrasonic treatment, filtered, dried, and ground to obtain a modified titanium dioxide powder; (4) the powder containing thiocyanate The pH value of the solution is adjusted to 6-11, and the modified titanium dioxide powder is put into it, and mixed to make a slurry; after standing in the dark, under the condition of room temperature and stirring, the sunlight is irradiated for photocatalytic degradation. In the present invention, metal ions and non-metal ions interact with titanium dioxide to form a doping energy level, which reduces the energy band width of titanium dioxide, expands the light absorption range, increases the transmittance, and increases the utilization rate of light energy. Promote the improvement of the light energy utilization rate of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of waste water purification and treatment, and in particular relates to a method for catalytically degrading thiocyanate in waste water with visible light. Background technique [0002] Thiocyanate is a typical halogen-like substance with good complexing properties, and is widely present in industrial wastewater such as cyanidation gold leaching, electroplating, and coking; although thiocyanate is less toxic than cyanide, when its mass concentration When it is higher than 5mg / L, it will inhibit the growth of bacteria. When the mass concentration of thiocyanate in human blood is as high as 100-150mg / L, it will be life-threatening; thiocyanide is harmful to aquatic animals and plants. At the same time, thiocyanate has a strong Stability, not easy to degrade naturally. The traditional methods of treating thiocyanate are generally natural adsorption, ion exchange, biodegradation and other methods; these methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30B01J35/00B01J27/24C02F101/18
CPCC02F1/30B01J27/24C02F2101/18B01J35/39
Inventor 杨洪英佟琳琳赵前飞金哲男
Owner NORTHEASTERN UNIV LIAONING