Method for mechanochemically degrading hexachlorobenzene by using silicon carbide as catalyst

A mechanochemical method, hexachlorobenzene technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of high energy consumption and long hexachlorobenzene time, and reduce the degradation time. Effect

Inactive Publication Date: 2019-09-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after research by the inventors of the present disclosure, it has been found that the mechanochemical degradation of hexachlorobenzene by existing degradation additives (such as a mixture of iron powder and quartz sand) has problems such as long time and high energy consumption.

Method used

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  • Method for mechanochemically degrading hexachlorobenzene by using silicon carbide as catalyst
  • Method for mechanochemically degrading hexachlorobenzene by using silicon carbide as catalyst
  • Method for mechanochemically degrading hexachlorobenzene by using silicon carbide as catalyst

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experiment example

[0046] Various additives were applied to the experiments of mechanochemical degradation of HCB. Additives include metal oxides (CaO and Al 2 O 3), metals (Fe and Al), SiO 2 , additive combination (Fe+SiO 2 and Al / Al 2 O 3 ) and SiC. Among them, CaO, Al 2 O 3 , Fe, Al, SiO 2 , Fe+SiO 2 and Al+Al 2 O 3 It is to repeat the previous research. SiC is a new additive to be verified. At present, there is no report on the use of SiC ball milling to degrade HCB. In the experiment, the mass ratio of the additive added to the ball mill to HCB was 5:1, and the experimental process was to add the additive and HCB to the stainless steel sealed ball mill tank (0.5L) of the ball mill, and the mass ratio of the additive to HCB was 5:1 ( The mass of SiC is 2.5g, the particle size is 30 mesh; the mass of HCB is 0.5g), and the total mass of stainless steel grinding balls is 270g (diameter and number of grinding balls: 10 diameters 15mm; 25 diameters 8mm; 25 diameters 5mm), ball mill 1...

Embodiment 1

[0049] Using Fe powder and SiC as additives, Fe powder is 40% of the total mass of Fe powder and SiC, and Fe powder particle size is 200 meshes. Add additives and HCB to the stainless steel sealed ball mill tank (0.5L) of the ball mill. The mass ratio is 5:1 (the mass of SiC is 2.5g, the particle size is 30 meshes; the mass of HCB is 0.5g), and the total mass of stainless steel grinding balls is 270g (diameter and number of grinding balls: 10 pieces with a diameter of 15mm; 25 pieces with a diameter of 8mm; 25 pieces with a diameter of 5mm), revolution and rotation ratio of 1:2, rotation at 700r / min, ball milling for 10min, to detect the degradation efficiency of HCB, the results are as follows figure 2 shown.

Embodiment 2

[0051] This embodiment is the same as embodiment 1, the difference is: the ball milling time is 15min, and the result is as follows figure 2 shown.

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Abstract

The invention provides a method for mechanochemically degrading hexachlorobenzene by using silicon carbide as a catalyst. The silicon carbide is used as the catalyst, a degradation additive is added, and the hexachlorobenzene is degraded by a mechanochemical process. When the silicon carbide and the degradation additive are added to mechanochemically degrade the hexachlorobenzene, the degradation time of the hexachlorobenzene is greatly shortened. Experiments show that the method shortens the hexachlorobenzene degradation time to 40 min or less, and even can complete the degradation of the hexachlorobenzene only within 15 min.

Description

technical field [0001] The present disclosure relates to the degradation of hexachlorobenzene, in particular to a method for degrading hexachlorobenzene by a mechanochemical method using silicon carbide as a catalyst. Background technique [0002] The statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Hexachlorobenzene (Hexachlorobenzen, C 6 Cl 6 , HCB for short) is an organochlorine fungicide, which is mainly used for the control of fungal damage by the outer membrane of wheat, barley and other cereal crops. The main sources of environmental pollution are agricultural production and chemical pollution, and HCB has become a global environmental pollutant. HCB has strong resistance to biological metabolism, photodegradation and chemical decomposition in the natural environment, and can persist in environmental media such as water, soil and sediment for decades or even longer. It i...

Claims

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Application Information

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IPC IPC(8): A62D3/30B01J27/224A62D101/04
CPCA62D3/30A62D2101/04B01J27/224
Inventor 李玉忠董言
Owner SHANDONG UNIV
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