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Photo-reduction method for carrying out degradation on organic halides by using carboxylic acids or carboxylates

An organic halide, carboxylate technology, applied in the field of environmental pollutant treatment, can solve the problems of long reaction time, low degradation efficiency, large power consumption, etc. wide effect

Active Publication Date: 2011-10-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among the above methods, the reaction time of microbial method, zero-valent iron reduction method and hydrothermal method is long and the degradation efficiency is low.
The titanium dioxide photocatalytic method can only be carried out under the irradiation of ultraviolet light, and the use of ultraviolet light has great limitations, such as large power consumption, high cost, and only 3% to 5% of ultraviolet light in sunlight, which is extremely large. partly visible light

Method used

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  • Photo-reduction method for carrying out degradation on organic halides by using carboxylic acids or carboxylates
  • Photo-reduction method for carrying out degradation on organic halides by using carboxylic acids or carboxylates
  • Photo-reduction method for carrying out degradation on organic halides by using carboxylic acids or carboxylates

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Experimental program
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Effect test

Embodiment 1

[0028] First add 5 ml of 0.001mM decabromodiphenyl ether dimethyl sulfoxide solution into the glass reactor, then add 0.0001M (NH 4 ) 2 C 2 o 4 Aqueous solution, the reactor mouth is sealed, feed argon or nitrogen 15 minutes, make reaction carry out under anaerobic condition; Magnetic stirring makes decabromodiphenyl ether dimethyl sulfoxide solution and (NH 4 ) 2 C 2 o 4 The aqueous solution is mixed evenly, the artificial light source used is a 300W xenon lamp, equipped with a 420nm cut-off filter, the light source is turned on, and irradiated with visible light for 180 minutes. In the light reaction, the oxalate ion and decabromodiphenyl ether form an ion-pair complex due to the halogen bond, and the ion-pair complex is excited by visible light to undergo electron transfer, and the decabromodiphenyl ether gets the electron of oxalate and is reduced Degradation, dehalogenation to generate low halogenated products. See the reaction result figure 1 , did not join (NH ...

Embodiment 2

[0031] Add 5 ml of 0.01mM decabromodiphenyl ether methanol solution to the reactor first, then add 0.001M H 2 C 2 o 4 Aqueous solution, seal the reactor mouth, feed argon or nitrogen for 15 minutes, so that the reaction is carried out under anaerobic conditions; magnetic stirring makes decabromodiphenyl ether methanol solution and H 2 C 2 o 4 The aqueous solution is mixed evenly. The artificial light source used is a 300W xenon lamp, equipped with a 420nm cut-off filter, turned on the light source, and irradiated with visible light for 60 minutes. The oxalate ion and decabromodiphenyl ether used form an ion-pair complex due to halogen bonds. The ion-pair complex is excited by visible light to undergo electron transfer, the decabromodiphenyl ether obtains the electrons of oxalate, undergoes reductive degradation, and dehalogenates to generate low-halogenated products. See the reaction result figure 2 , oxalic acid can lead to degradation reactions.

[0032] figure 2 Th...

Embodiment 3

[0034] Add 5 ml of 0.01mM decabromodiphenyl ether methanol solution to the two glass reactors, and then add 0.001M K 2 C 2 o 4 Aqueous solution, 0.001M (NH 4 ) 2 C 2 o 4 Aqueous solution, seal the two reactor ports, respectively pass through argon or nitrogen for 15 minutes, so that the reaction is carried out under anaerobic conditions; magnetic stirring makes decabromodiphenyl ether methanol solution and K 2 C 2 o 4 aqueous solution, decabromodiphenyl ether methanol solution and (NH 4 ) 2 C 2 o 4 The aqueous solution is mixed evenly, the artificial light source used is a 300W xenon lamp, equipped with a 420nm cut-off filter, the light source is turned on, and the visible light is irradiated for 60 minutes, and the oxalate ion used and the decabromodiphenyl ether form ion-pair complexation due to the halogen bond. The ion-pair complex is excited by visible light to undergo electron transfer, and decabromodiphenyl ether obtains electrons from oxalate for reduction a...

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Abstract

The invention relates to a photo-reduction method for carrying out degradation on organic halides by using carboxylic acids or carboxylates, and is characterized in that an ion-pair complex is generated through the interaction between the carboxylate radicals in micromolecular carboxylic acids or carboxylates and the halogen bonds of organic halides; the ion-pair complex produces a new absorption band in a visible region, then under the irradiation exciting of a visible light source, the excited ion-pair complex has an electron transfer, the oxygen atoms in the micromolecular carboxylate radicals transmit electrons to the halogen atoms of the organic halides, and after organic or inorganic alkalis are added, the electron-donating capacity of the oxygen atoms in the micromolecular carboxylate radicals is strengthened, so that the reaction rate can be accelerated; and while receiving electrons, the organic halides extract hydrogen atoms from a dissolvent, and after carrying out dehalogenation reduction on the organic halides subjected to hydrogen extraction, an easily-processed low halide or complete de-halogenated product (the number of halogen atoms thereof is reduced) is obtained, thereby achieving the purpose of effectively degradating the organic halides. The method provided by the invention can be performed at normal temperature, and can greatly improve the solar energy utilization ratio without secondary pollution, therefore, the method has a wide application prospect.

Description

technical field [0001] The invention relates to a treatment method for a class of environmental pollutants, in particular to a photochemical reduction method for degrading environmental pollutants-organic halogenated substances under the excitation of visible light by using small molecular carboxylic acids or small molecular carboxylate salts. Background technique [0002] With the progress of science and the continuous development of economy, environmental pollution has become a common and very serious problem in the world today. In particular, the pollution of refractory toxic organic pollutants (POPs) has become an urgent global environmental problem to be solved. Persistent organic halogenated organic pollutants in POPs are widely used as high-efficiency flame retardants and high-performance surfactants in electrical equipment, textiles, building materials, cleaning agents, pesticides, and halogen-containing polymer materials. Its long-term and large-scale use has led t...

Claims

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Application Information

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IPC IPC(8): A62D3/10
Inventor 赵进才孙春燕陈春城马万红
Owner INST OF CHEM CHINESE ACAD OF SCI
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