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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 surface energy of TiO in the aqueous suspension is large, and it is easy to cause aggregation and agglomeration with pesticide particles, and the catalytic activity will decrease to inactivation over time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0012] 4g of ultrafine titanium dioxide powder with an average particle size of about 100nm was ultrasonically dispersed in 100ml of distilled water to form a suspension of titanium dioxide, and then a porous ceramic sheet (300×100mm) with a pore diameter of 300 , immerse it in the titanium dioxide suspension for about 2 hours, bake it in an oven at 110°C for 1 hour, then bake it at 600°C for 8 hours, put it in a drying oven and cool it to room temperature to get the catalyst flakes. Put this sheet into a photocatalytic reactor, let the catalytic sheet be perpendicular to the ultraviolet light, start stirring to make the reaction solution uniform, and degrade the methomyl in the water under the irradiation of 75W ultraviolet light for 120 minutes, which can make the pesticide methomyl in the water 86% degradation.

experiment example 2

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

experiment example 3

[0016] 4g of ultrafine titanium dioxide powder with an average particle size of about 50nm is ultrasonically dispersed in 100ml of distilled water to form a suspension of titanium dioxide, and then the porous ceramic sheet (300×100mm) that has been treated with hexanoic acid and silanization, with a pore diameter of 200 , immerse it in the titanium dioxide suspension for about 2 hours, bake it in an oven at 110°C for 1 hour, then bake it at 650°C for 6 hours, put it in a drying oven and cool it to room temperature to get the catalyst flakes. Put this sheet into the photocatalytic reactor, let the catalytic sheet be perpendicular to the ultraviolet light, start stirring to make the reaction solution uniform, and degrade the Zhongbucarb in the water under the irradiation of 100W ultraviolet light for 180 minutes, which can make the pesticide Zhongbucarb 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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