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Method for degrading endosulfan through mechano-chemical process

A mechanochemical method, endosulfan technology, applied in the restoration of contaminated soil, grain treatment, etc., can solve the problems of rare mechanochemical degradation research

Active Publication Date: 2018-12-28
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many studies, scholars only ball-milled chlorine-containing refractory organics, but studies on the mechanochemical degradation of organics containing both chlorine and sulfur are relatively rare.

Method used

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  • Method for degrading endosulfan through mechano-chemical process
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  • Method for degrading endosulfan through mechano-chemical process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for degrading endosulfan using a mechanochemical method, the ball milling speed is 520rpm, the material ratio is 20:1, the ball-to-material ratio is 20:1, the mass of iron balls is 120g, and the ball mill is rotated for 30 minutes and immediately reversed for 30 minutes, and so on; After ball milling, the degradation rate of endosulfan was determined; wherein, the abrasives were CaO, MgO, SiO 2 , CaO: Fe powder = 1: 1 (mass ratio), MgO: Fe powder = 1: 1 (mass ratio), SiO 2 : Fe powder=1:1 (mass ratio), ball milled for 30min.

[0034] figure 1 For the comparison of the degradation efficiency of endosulfan ball milling for 30min between various abrasives and different combinations, from figure 1 It can be seen that when ball milling for 30min, the degradation rate of endosulfan by MgO and CaO is the highest, followed by the combination of iron powder and MgO and CaO (mass ratio 1:1), and the other efficiencies are all no more than 50%, especially When Fe powde...

Embodiment 2

[0036] A method for degrading endosulfan using a mechanochemical method is the same as in Example 1, wherein the grinding agent is CaO. 1) The ball milling speed is 100rpm, 200rpm, 300rpm, 400rpm, 500rpm, respectively, 2) The ball milling time is 15min, 30min, 60min, 90min, 120min, 3) The material ratio is 2:1, 5:1, 10:1, 15 : 1, 20: 1; 4) The ball-to-material ratio is 2: 1, 5: 1, 10: 1, 15: 1, 20: 1.

[0037] figure 2 , image 3 and Figure 4 The effect of different ball milling conditions on the degradation rate of endosulfan was ball milled for 30 minutes. The test process adopts the control variable method. It can be seen from the figure that material ratio, pellet ratio and rotational speed have a great influence on the degradation rate of endosulfan. With the increase of material ratio, ball-to-material ratio and rotational speed, the degradation rate of endosulfan increased and showed a continuous upward trend. This shows to a certain extent that high material ra...

Embodiment 3

[0038] Embodiment 3 degrades soil test containing endosulfan

[0039] The soil was taken from the back hill of Nanjing Forestry University. After the soil is dried, ground, sterilized and dried, it passes through 40 meshes, and the technical endosulfan is added. After ball milling, the residual amount of endosulfan is measured and the removal efficiency of endosulfan is calculated.

[0040] The ratio of soil and endosulfan technical is 100:1, first dissolve 1.0000g endosulfan in 50mL acetone solution to make endosulfan-acetone solution with a concentration of 20g / L; sprinkle 50mL endosulfan-acetone solution evenly on 100g In the pretreated soil, thoroughly mix the endosulfan solution and the soil. Properly heat and stir to volatilize the acetone until the soil is re-dried, and take random samples to measure the final total content of endosulfan in the soil. Take five groups of 10g endosulfan-containing soil, add about 0.7g CaO (the mass ratio of calcium oxide to endosulfan is ...

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Abstract

The invention discloses a method for degrading endosulfan through a mechano-chemical process. The method comprises the steps that endosulfan or endosulfan-containing matter and a grinding agent are added into a ball mill together to be subjected to ball milling for 15 min or longer, so that endosulfan degrading is realized, specifically, the rotation speed of the ball mill is 400-600 rpm, the material ratio is 15-20:1, the ratio of grinding media to a material is 15-20:1, the ball mill rotates reversely immediately after rotating for 30 min, and the operations are repeatedly carried out. According to the method, CaO and MgO are adopted independently, and the endosulfan degrading efficiency is 96% or above due to ball milling for half an hour; and ball milling is carried out for 15 min under the conditions that the material ratio is 15-20:1, the ratio of the grinding media to the material is 15-20:1 and the rotation speed is 500 rpm, the degrading rate is 70%, and the content of endosulfan in soil is reduced from original 3451.042 mg / kg to 1043 mg / kg. After endosulfan is subjected to ball milling for 120 min, the content of endosulfan in soil is reduced to 430.6 mg / kg, the soil degrading rate is 85.62%, and a good practical application effect is achieved.

Description

technical field [0001] The invention relates to the technical field of endosulfan degradation, in particular to a method for degrading endosulfan by using a mechanochemical method. Background technique [0002] Endosulfan (C 9 h 6 Cl 6 o 3 S), the chemical name is 1,4,5,6,7,7-hexachloro-9,9,10-trinorbornene-5-ene-2,3-ylidene bis-methylene, and its aliases are Saidan, Endosulfan, with a relative molecular mass of 406.91, is a sulfite with two isomers, namely α-endosulfan and β-endosulfan, and technical grade endosulfan α-endosulfan and β-endosulfan The ratio of Dan is about 7:3, and its structural formula is as follows: [0003] [0004] Endosulfan (Endosulfan) is a new type of persistent organic pollutants (Persistent Organic Pollutants, POPs) containing both chlorine and sulfur elements, which will cause persistent harm to water, the atmosphere and the soil environment during its production and use and pollution. Endosulfan is stable in nature and not easily decom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/10B02C17/20B02C23/06B02C25/00B09C1/00
CPCB02C17/10B02C17/20B02C23/06B02C25/00B02C2201/06B09C1/00
Inventor 乔维川葛秀秀
Owner NANJING FORESTRY UNIV
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