Method for light catalytic degrading carbamate pesticide in water

A carbamate-based, photocatalytic technology, applied in chemical instruments and methods, light water/sewage treatment, physical/chemical process catalysts, etc., can solve problems such as difficult recycling, reduced catalytic activity, and high recycling costs, and achieve Strong adhesion, fast degradation, no secondary pollution

Inactive Publication Date: 2005-05-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of TiO 2 aqueous suspension, the catalytic material TiO 2 It is difficult to recycle, the recycling cost is high, and it is easy to cause secondary pollution; on the other hand, the sur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Experimental example 1.

[0012] Disperse 4g of ultrafine titanium dioxide powder with an average particle size of about 100nm in 100ml of distilled water ultrasonically to form a suspension of titanium dioxide, and then acidify and silanize a porous ceramic sheet (300×100mm) with a pore size of 300 , immerse it in the titanium dioxide suspension for about 2 hours, bake it in an oven at 110°C for 1 hour, roast it at 600°C for 8 hours, and cool it to room temperature in a drying oven to obtain catalyst flakes. Put this sheet into a photocatalytic reactor, make the catalytic sheet perpendicular to the ultraviolet light, start stirring to make the reaction liquid uniform, and degrade methomyl in the water by irradiating it under 75W ultraviolet light for 120 minutes to make methomyl pesticides in the water Degraded by 86%.

Example Embodiment

[0013] Experimental example 2.

[0014] Disperse 4g of ultrafine titanium dioxide powder with an average particle size of about 100nm in 100ml of distilled water ultrasonically to form a titanium dioxide suspension, and then acidify and silanize a porous ceramic sheet (300×100mm) with a pore size of 100 , immerse it in the titanium dioxide suspension for about 1 hour, bake it in an oven at 110°C for 1 hour, calcinate at 700°C for 6 hours, and cool to room temperature in a drying oven to obtain catalyst flakes. Put this flake into a photocatalytic reactor, make the catalyst flake perpendicular to the ultraviolet light, start stirring to make the reaction liquid uniform, and degrade carbofuran in water by irradiating it under 100W ultraviolet light for 120 minutes, which can make carbofuran pesticide in water Degraded by 95%.

Example Embodiment

[0015] Experimental example 3.

[0016] Disperse 4g of ultrafine titanium dioxide powder with an average particle size of about 50nm in 100ml of distilled water ultrasonically to form a titanium dioxide suspension, and then acidify and silanize a porous ceramic sheet (300×100mm) with a pore size of 200 , immerse it in the titanium dioxide suspension for about 2 hours, bake it in an oven at 110°C for 1 hour, roast it at a high temperature of 650°C for 6 hours, and cool it to room temperature in a drying oven to obtain catalyst flakes. Put this sheet into a photocatalytic reactor, make the catalytic sheet perpendicular to the ultraviolet light, start stirring to make the reaction liquid uniform, and degrade the sec-bucarb in water by irradiating it under 100W ultraviolet light for 180 minutes, which can make the pesticide sec-bucarb in the water 92% degradation.

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Abstract

A method for photo-catalytic degrading carbamate agricultural pesticide in water is carried out by fixing carrying TiO2 on ceramic slice with porous structure, putting the slice as catalyst slice into photo-catalytic reactor, degrading carbamate agricultural pesticide in water under ultraviolet irradiation, ultrasonic dispersing the superfine TiO2 powder in distilled water to form TiO2 suspensoid, immersing acidified and silanized porous ceramic slice in suspensoid for 2 hrs, baking at 110deg.C in oven for 1 hr, roasting at 600-7002deg.C for 6-8 hrs, and cooling to temperature in drier. Its advantages include low cost, fast speed and no pollution.

Description

technical field [0001] The invention relates to a method for degrading pesticides used in the technical field of environmental protection, in particular to a method for photocatalytically degrading carbamate pesticides in water. Background technique [0002] With the increase in the variety and production of pesticides year by year, the industrial wastewater generated during the production process of pesticides has also increased, which is a major problem in wastewater treatment and one of the reasons for the deterioration of drinking water sources. Carbamate pesticides account for a large category of pesticides. At present, industrial wastewater is generally treated chemically or biochemically. These treatment methods often require the input of other chemicals to destroy toxic wastewater, or the construction of huge biochemical treatment devices. Therefore, these methods are costly. A lot of manpower, financial and material resources, some of which cause secondary pollution...

Claims

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Application Information

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IPC IPC(8): B01J21/06C02F1/30
Inventor 曹永松易磊陆贻通
Owner SHANGHAI JIAO TONG UNIV
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