Method for organochlorine pesticide photocatalytic degradation on nano titania

A technology of nano-titanium dioxide and photocatalysis, which is applied in botany equipment and methods, animal repellants, biocides, etc., can solve the problems of high cost and long time consumption, and achieve low cost, short time consumption and simple degradation process method Effect

Inactive Publication Date: 2006-10-11
XIAMEN UNIV
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  • Method for organochlorine pesticide photocatalytic degradation on nano titania
  • Method for organochlorine pesticide photocatalytic degradation on nano titania
  • Method for organochlorine pesticide photocatalytic degradation on nano titania

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Embodiment 1

[0018] Injection of organochlorine pesticides into powdered nano-TiO with a diameter of 35 nm 2 In distilled water, the concentration of organochlorine pesticides in the solution is 100ppb, nano-TiO 2 The concentration is 0.50mg / mL, and the air flow rate is 100mL / min. After the solution is ultrasonically mixed, it is vigorously stirred on a magnetic stirrer, and the photocatalytic degradation is irradiated with an ultraviolet lamp for 30 minutes. The ultraviolet source is a 30W ultraviolet germicidal lamp. , the radiation wavelength is 254nm, and the ultraviolet lamp is placed 9-10cm above the solution. The reacted solution was passed through a 0.45 μm syringe filter to remove powdered TiO 2 , extracting the filtered solution with n-hexane, discarding the water phase, and detecting and analyzing the degraded product of the obtained organic phase through GC-ECD, the degradation yield of most of the organochlorine pesticides on the surface can reach more than 90% after reaction...

Embodiment 2

[0020] α-BHC, β-BHC, γ-BHC, δ-BHC, aldrin, dieldrin, endrin, bifenthrin, beta-cyfluthrin, cypermethrin, fenvalerate and heptachlor 12 Organochlorine pesticides and permethrin containing chlorine, among which the concentration of beta-cyfluthrin is 400ppb, and the others are 100ppb, TiO 2 The dosage is 0.50mg / mL, the diameter is 50nm, the air flow rate is 90mL / min, and the photodegradation time is selected as 15, 30, and 60min respectively for photocatalytic degradation. The reacted solution was passed through a 0.45 μm syringe filter to remove powdered TiO 2 , the filtered solution was extracted with n-hexane, the aqueous phase was discarded, and the resulting organic phase was detected by GC-ECD to analyze the degraded products. Taking α-BHC (α-666) as an example, after analysis and calculation, the degradation rates at 15, 30, and 60 minutes were respectively 83.67%, 90.17%, and 97.19%, and the degradation rates for dieldrin were 41.87%, 84.14%, 86.47%; and for refractory ...

Embodiment 3

[0022] With the above-mentioned 12 kinds of organochlorine pesticides and the permethrin containing chlorine element, wherein the concentration of beta-cyfluthrin is 160ppb, and the others are 40ppb, and the air flow is 120mL / min, and light (without nano TiO 2 ) and photocatalytic degradation (TiO 2 The dosage is 0.25mg / mL), and the degradation time is 30min. The solution after direct irradiation was extracted with n-hexane. The solution after the photocatalytic degradation reaction was passed through a 0.45 μm syringe filter to remove powdered TiO 2 , the filtered solution was extracted with n-hexane, the aqueous phase was discarded, and the resulting organic phase was detected by GC-ECD to analyze the degraded products. Dieldrin and endrin are the most obvious, and their degradation rates under light conditions are 6.57% and 2.90%, respectively, while the degradation rates in photocatalytic degradation can reach 94.08% and 93.57%, so it shows that TiO 2 The participating ...

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Abstract

The invention provides a method for photocataytic degrading organ-chlorine pesticide in contaminant with nanometer TiO2. The method comprises following steps: drying the standard pesticides prepared with acetone by nitrogen; adding into nanometer TiO2 powder and water, getting mixed suspending liquid of TiO2 and pesticides; filling into air into the mixed liquid after ultrasonic vibration; irradiating directly with ultraviolet lamp for disinfection, removing TiO2 powder with filter after photocataytic degradation; extracting the liquid with skellysolve B, and getting the organic phase. The organic phase is the target object. The method is characterized by low cost, no pollution, and simple degradation process with short time. The organ-chlorine pesticide can be degraded in 30 minutes. The method can be used to treat organ-chlorine pesticide in wastewater or other.

Description

technical field [0001] The invention relates to an organochlorine pesticide, in particular to a method applicable to the degradation and transformation of the organochlorine pesticide in pollutants. Background technique [0002] In the pesticide family, organochlorine pesticides occupy a considerable proportion. Organochlorine pesticides have low acute toxicity, but due to their stable chemical properties, they degrade very slowly in the environment, easily remain and enter the human body through accumulation in animals and plants and the action of the food chain, causing harm to human health. Especially BCH and DDT pesticides, these two pesticides are not easy to decompose and transform like other organic pollutants, but remain in the environment for a long time, and can enter the human body through the food chain, causing great harm to human health. my country banned the use of such pesticides in 1983, but currently there are still pesticides that contain chlorine or prod...

Claims

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Application Information

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IPC IPC(8): A01N25/32
Inventor 陈曦余彬彬黄沙袁宁肖来龙
Owner XIAMEN UNIV
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