JP2000080489A - Method for decomposing harmful organic compounds - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and perfectly detoxicate harmful compds. by electrochemical decomposition by dissolving harmful compds. contained in the material to be treated into an aprotic solvent and executing energizing by the plus oxidation potential or minus reduction potential in an electrolytic cell. SOLUTION: Various harmful organic compds. are preferably once extracted with an organic solvent, are concentrated and dissolved into an aprotic solvent such as acetonitrile or the like. This solution is added with perchlorate as supporting salt to obtain an electrolytic soln. This electrolytic soln. 20 is stored into an electrolytic cell such as a double layer type electrolytic cell 15 in which the electrolytic soln. 20 is divided by a diaphragm 14, or an electrolytic cell of a three layer system, the one with no diaphragms or the like, at the electrolytic cell 18 on the side of the anode, a platinum electrode 11 and an Ag/Ag+ reference electrode 12 as working poles are arranged, and, at the electrolytic cell 19 on the side of the cathode, a carbon platinum electrode 13 as the counter pole is arranged. On the space between the electrodes, energizing by the oxidation potential of about >=+1.5V or the reduction potential of about <=2.0 V is executed, and electrochemical decomposition is executed. In this way, the harmful organic chemical substance is decomposed and is converted into the perfectly harmless substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of electrochemically detoxifying harmful organic compounds.

[0002]

2. Description of the Related Art Heretofore, there have been many chemical substances that have been banned from being used as harmful substances, and have been regarded as extremely dangerous for living organisms on the earth as environmental hormones. Social problems. For example, dioxins detected from incineration exhaust gas from garbage incineration plants, PCBs used in transformers of electrical equipment and leaked due to improper disposal after being disposed of, and the risk of environmental pollution being pointed out There are currently 70 types of substances called environmental hormones, such as styrene dimer and styrene trimer, which are by-products of the expanded polystyrene manufacturing process, such as DDT, dieldrin, aldrin, endrin, and chlordane used in agricultural pesticides. It is said that there is also

[0003] These problems can be solved by establishing a method for removing or decomposing harmful substances. However, one of the characteristics of harmful substances represented by PCBs is that they are chemically very stable substances. Therefore, it is not easy to simply disassemble and detoxify the harmful substance, and only the very high-cost PCB decomposition technique can be used to establish the decomposition technique at the present stage.

For example, taking a PCB as an example, a method for decomposing a PCB by irradiating the PCB with ultraviolet rays is disclosed in
1-68281 or culturing microorganisms in PCB-containing medium
As a method for decomposing B, there is a technique described in JP-A-4-37097. In addition, the insulating oil containing PCB is put into a solid heating furnace, heated at a temperature of less than 1100 ° C., and the PCB is evaporated and separated, ignited and burned, and the combustion gas of PCB is 1200 ° C.
Japanese Patent Application Laid-Open No. Hei 2-2: A technology for detoxifying by pyrolysis at a high temperature in another pyrolysis furnace maintained at a high temperature of 1500 ° C. or lower.
32027, which is known as a general decomposition method.

[0005]

In addition, there is no general method for decomposing substances called harmful substances, and only a method for decomposing PCB is generally present. In addition, many of the harmful substances are chlorine compounds, are difficult to decompose, and have strong bioconcentration properties, making it difficult to decompose them, and the reality is that only large-scale equipment, such as conventional high-temperature and high-pressure equipment, has to be used. However, there is a problem in that a simple apparatus is required, and there is no established technique for decomposing harmful organic compounds other than PCBs.

[0006]

According to the method of the present invention, various harmful substances once extracted and concentrated with an organic solvent are dissolved in an aprotic solvent, and the perchlorate is used as a supporting salt to at least +1.5 V. A method for decomposing harmful organic compounds, characterized in that harmful substances in any object to be treated are completely converted to harmless substances by conducting electricity at an oxidation potential or a reduction potential of -2.0 V or less. is there.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In order to carry out the method of the present invention preferably, an electrolytic cell for electrolysis is a two-layer electrolytic cell or a three-layer electrolytic cell having a diaphragm separating an anode side and a cathode side, or A non-diaphragm electrolytic cell is preferred. An aprotic solvent such as acetonitrile or N, N-dimethylformamide (DMF) is preferable for the electrolytic solution for dissolving the extract / concentrate of harmful organic compounds, and lithium perchlorate or perchloric acid for the supporting electrolyte. It is desirable to use sodium, a perchlorate such as tetraethylammonium perchlorate, and a carbon electrode or a platinum electrode as the electrode. Usually, the amount of electricity
At 100 F (Faraday) / mol (mol), 98% or more of the harmful organic compounds are decomposed.

[0008] The object to be treated obtained as described above is dissolved in an electrolytic solution in which a supporting electrolyte is dissolved, and poured into a two-layer electrolytic cell or a three-layer electrolytic cell with a diaphragm or a non-diaphragm electrolytic cell to obtain an oxidation potential or Electrolysis is performed at the reduction potential. At this time, it is desirable to install a reference electrode for voltage setting on the decomposition electrolytic cell side.However, depending on the power supply used, even if power is supplied without installing the reference electrode, harmful organic compounds can be electrochemically decomposed It is possible to This gives the power supply for energization a wide range of applicability.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 15 denotes a two-layer electrolytic cell. A diaphragm 14 is provided to divide the electrolytic cell into an anode-side electrolytic cell 18 and a cathode-side electrolytic cell 19.
Is installed, and the carbon electrode 13 is installed in the cathode-side electrolytic cell.
Each of the electrodes is attached to the two-layered electrolytic layer 15 via a plug 17 having a pore. A stirrer 16 is provided in each of the anode-side electrolytic cell 18 and the cathode-side electrolytic cell 19 so that the harmful organic compound and the electrolytic solution 20 are efficiently uniformized. Also, an Ag / Ag ⁺ electrode 12 is provided as a reference electrode in the anode-side electrolytic cell 18 via a plug 17 with a pore.

As another embodiment, referring to FIG. 2, reference numeral 30 denotes a single-layer type non-diaphragm electrolytic cell, in which a platinum electrode 11 is provided as a working electrode and a carbon electrode 13 is provided as a counter electrode to fix each electrode. Is attached to the one-layer type non-diaphragm electrolytic cell 30 through the stopper 17 with a hole. A stirrer 16 is provided in the electrolytic bath to efficiently homogenize the harmful organic compound and the electrolytic solution 20. Further, an Ag / Ag ⁺ electrode 12 is provided as a reference electrode in a single-layer type non-diaphragm electrolytic cell 30 via a plug 17 with a pore.

[0011] The method for carrying out the method will be described in detail. 0.1149 g of tetraethylammonium perchlorate
Was dissolved uniformly in a two-layer electrolytic cell, and 470 μg of aldrin was added to the anode side to dissolve with stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, the amount of electricity is 2.4.
When 9 clones (20 F / mol), 9
Decomposition of 9.5% or more could be confirmed by using high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 193 nm, and the time required for energization (decomposition) was 60 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell, and put 480μ of endrin on the anode side.
g was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, 99.0% or more of the endrin was degraded when the amount of electricity was 2.43 clones (20 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an absorption detector. In this case, the detection wavelength is 193 nm.
The time required for energization (disassembly) was 59 minutes.

[0013] Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell and put 500μ
g was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, 99.2% or more of chlordane was decomposed when the amount of electricity was 2.35 clones (20 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an absorption detector. In this case, the detection wavelength is 193 nm.
The time required for energization (disassembly) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Place evenly in a layered electrolytic cell and place dieldrin 480 on the anode side.
μg was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, 99.0% or more of dieldrin was decomposed when the amount of electricity was 2.43 clones (20 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an is absorption detector. The detection wavelength at this time is 193n.
m, the time required for energization (decomposition) was 59 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell and put heptachlor 470 on the anode side.
μg was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, 99.5% or more of heptachlor was decomposed when the amount of electricity was 2.43 clones (20 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an is absorption detector. The detection wavelength at this time is 193n.
m, the time required for energization (decomposition) was 59 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The solution was uniformly placed in a layered electrolytic cell, and 320 μg of 2,4,5-trichlorophenoxyacetic acid was added to the anode side and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, the current flow was 2.42 clones (20
(F / mol), 98.5% or more of 2,4,5-trichlorophenoxyacetic acid was decomposed by UV-Vi
It could be confirmed using high performance liquid chromatography connected to an s absorption detector. In this case, the detection wavelength is 256 nm.
The time required for energization (disassembly) was 58 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 570 μg of dichlorodiphenyltrichloroethane was added to the anode side and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, the amount of electricity was 1.55 clones (10
(F / mol), 98.5% or more of dichlorodiphenyltrichloroethane was decomposed in UV-Vis
It could be confirmed by using high performance liquid chromatography connected to an absorption detector. In this case, the detection wavelength is 256 nm.
The time required for energization (disassembly) was 37 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell, and put methoxychlor 55 on the anode side.
0 μg was added and dissolved by stirring. Ag / Ag ⁺
Was used as a reference electrode, an oxidation potential of +2.10 V was applied to the platinum anode, and electrolysis was performed at a constant potential. As a result, 98.0% or more of aldrin was decomposed when the amount of electricity was 1.54 clones (10 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an is absorption detector. The detection wavelength at this time is 256n
m, the time required for energization (decomposition) was 37 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell and put 200μ of biphenyl on the anode side.
g was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, 99.0% or more of biphenyl was decomposed when the amount of electricity was 1.25 clones (10 F / mol).
It could be confirmed by using high performance liquid chromatography connected to an absorption detector. In this case, the detection wavelength is 256 nm.
The time required for energization (the above decomposition) was 30 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 210 μg of 2,2-dihydroxybiphenyl was added to the anode side and dissolved by stirring. Ag / Ag ⁺ as a reference electrode and +2.
Electrolysis was performed at a constant potential by applying an oxidation potential of 10V. As a result, the current flow was 1.63 clones (15 F / m
ol) at the time of 2,2-dihydroxybiphenyl.
Decomposition of 5% or more could be confirmed by using high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 39 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 210 μg of 2,3-dihydroxybiphenyl was added to the anode side and dissolved by stirring. Ag / Ag ⁺ as a reference electrode and +2.
Electrolysis was performed at a constant potential by applying an oxidation potential of 10V. As a result, the current flow was 1.63 clones (15 F / m
ol) at the time of 2,3-dihydroxybiphenyl.
Decomposition of 5% or more could be confirmed by using high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 39 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 250 µg of 1,2-benzopyrene was added to the anode side and dissolved by stirring. Ag /
Electrolysis was performed at a constant potential by applying an oxidation potential of +2.10 V to the platinum anode using Ag ⁺ as a reference electrode. As a result, 98.5% or more of 1,2-benzopyrene was decomposed when the amount of electricity passed was 1.91 clones (20 F / mol), using high performance liquid chromatography connected to a UV-Vis absorption detector. It could be confirmed. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 46 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in a layered electrolytic cell, 190 μg of styrene on the anode side
Was added and dissolved by stirring. An oxidation potential of +2.10 V was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode, and electrolysis was performed at a constant potential. As a result, it was confirmed that 98.0% or more of styrene was decomposed when the amount of electricity passed was 3.52 clones (20 F / mol), using high-performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 85 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Bisphenol A2 is placed evenly in a layered electrolytic cell
30 μg was added and dissolved by stirring. Ag / Ag
⁺ Over an oxidation potential of + 2.10 V to platinum anode as the reference electrode, it was electrolyzed at a constant potential. As a result, 99.5% or more of bisphenol A was decomposed when the amount of electricity was 0.972 clones (10 F / mol), which could be confirmed by using high performance liquid chromatography connected to a UV-Vis absorption detector. . The detection wavelength at this time was 256 nm, and the time required for energization (the above decomposition) was 2
3 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 200 μg of 2,4-dichlorophenol was added to the anode side and dissolved by stirring. In addition, +2.10 was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode.
Electrolysis was performed at a constant potential by applying an oxidation potential of V. As a result, the amount of electricity was 2.37 clones (20 F / mo).
It was confirmed that 99.0% or more of 2,4-dichlorophenol was decomposed in 1) by using high performance liquid chromatography connected to a UV-Vis absorption detector.
The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 200 μg of 2,5-dichlorophenol was added to the anode side and dissolved by stirring. In addition, +2.10 was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode.
Electrolysis was performed at a constant potential by applying an oxidation potential of V. As a result, the amount of electricity was 2.37 clones (20 F / mo).
At 1), it was confirmed that 99.0% or more of 2,5-dichlorophenol was decomposed by using high performance liquid chromatography connected to a UV-Vis absorption detector.
The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 200 μg of 2,6-dichlorophenol was added to the anode side and dissolved by stirring. In addition, +2.10 was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode.
Electrolysis was performed at a constant potential by applying an oxidation potential of V. As a result, the amount of electricity was 2.37 clones (20 F / mo).
It was confirmed that 99.0% or more of 2,6-dichlorophenol was decomposed in 1) by using high performance liquid chromatography connected to a UV-Vis absorption detector.
The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 200 μg of 3,4-dichlorophenol was added to the anode side and dissolved by stirring. In addition, +2.10 was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode.
Electrolysis was performed at a constant potential by applying an oxidation potential of V. As a result, the amount of electricity was 2.37 clones (20 F / mo).
At 1), it was confirmed that 99.0% or more of 3,4-dichlorophenol was decomposed using high performance liquid chromatography connected to a UV-Vis absorption detector.
The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The solution was uniformly placed in a layered electrolytic cell, and 200 μg of 3,5-dichlorophenol was added to the anode side and dissolved by stirring. In addition, +2.10 was applied to the platinum anode using Ag / Ag ⁺ as a reference electrode.
Electrolysis was performed at a constant potential by applying an oxidation potential of V. As a result, the amount of electricity was 2.37 clones (20 F / mo).
At 1), it was confirmed that 99.0% or more of 3,5-dichlorophenol was decomposed by using high performance liquid chromatography connected with a UV-Vis absorption detector.
The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 57 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
200 μg of 2,4,5-trichlorophenol was added uniformly to the anode side and dissolved by stirring.
Ag / Ag ⁺ is used as a reference electrode, and +
Electrolysis was performed at a constant potential by applying an oxidation potential of 2.10 V. As a result, the energization amount was 1.95 clones (20F
/ Mol), 98.5% or more of 2,4,5-trichlorophenol was decomposed by high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 47 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 200 μg of 2,4,6-trichlorophenol was added to the anode side and dissolved by stirring.
Ag / Ag ⁺ is used as a reference electrode, and +
Electrolysis was performed at a constant potential by applying an oxidation potential of 2.10 V. As a result, the energization amount was 1.95 clones (20F
/ Mol), 98.5% or more of 2,4,6-trichlorophenol was decomposed by high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 47 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The mixture was uniformly placed in a layered electrolytic cell, and 350 μg of tetrachloroethylene was added to the anode side and dissolved by stirring. Ag /
Electrolysis was performed at a constant potential by applying an oxidation potential of +2.10 V to the platinum anode using Ag ⁺ as a reference electrode. As a result, 99.0% or more of tetrachloroethylene was decomposed when the amount of electricity passed was 2.04 clones (10 F / mol), using high-performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 210 nm, and the time required for energization (decomposition) was 49 minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
The solution was uniformly placed in a layered electrolytic cell, and 350 μg of trichlorethylene was added to the anode side and dissolved by stirring. Ag / A
Electrolysis was performed at a constant potential by applying an oxidation potential of +2.10 V to the platinum anode using g ⁺ as a reference electrode. As a result, 99.0% or more of trichlorethylene was decomposed when the amount of electricity was 2.57 clones (10 F / mol), which could be confirmed by using high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 210 nm, and the time required for energization (the above decomposition) was 6 nm.
Two minutes.

Tetraethylammonium perchlorate 0.1
149 g of acetonitrile solution (5.0 ml) was dissolved in 2
Put evenly in the layered electrolytic cell and put PCB (mixture) 4 on the anode side.
10 μg was added and dissolved by stirring. Ag / Ag
⁺ Over an oxidation potential of + 2.10 V to platinum anode as the reference electrode, it was electrolyzed at a constant potential. As a result, when the amount of electricity was 3.65 clones (30 F / mol), P
More than 98.0% of the CB (mixture) is decomposed,
It could be confirmed using high performance liquid chromatography connected to a UV-Vis absorption detector. The detection wavelength at this time was 256 nm, and the time required for energization (decomposition) was 88 minutes.

Even when the electrolysis of each harmful substance is carried out using a non-diaphragm electrolytic cell as shown in FIG. 2, the amount of electricity required to decompose each harmful substance (the amount of electricity) hardly changes and the decomposition rate also increases. It turned out to be the same. Therefore, two methods are possible for performing the electrolysis of the harmful substances described above using a two-layer electrolytic cell and performing electrolysis using a one-layer non-diaphragm electrolytic cell. It is desirable to perform the electrolysis by selecting a method that is easy to apply.

[0036]

As described above, the problematic PCB can be electrolyzed not only in a two-layer electrolytic cell as in the previous embodiment but also in a single-layer electrolytic cell. It is optimal as an efficient primary decomposition method of PCB in insulating oil of old transformer contaminated with PCB. For example, perchlorate is added as a supporting electrolyte to insulating oil in a transformer at 0.0
After dissolving at a concentration of about 5 to 1.0 mol / l (M), two carbon electrodes are inserted into insulating oil, and the potential difference between the two electrodes is 2 V
Or a reference electrode is provided to supply a current so that the potential difference between the anode and the reference electrode is about 2 V.
It is possible to reduce CB to a concentration of 1/10 or less of the original.

In addition, during the time of each electrolysis, the electric current value is set to 0.
This is the time when the operation is performed at about 7 mA. The electrolysis time can be reduced by increasing the electrode area, increasing the supporting electrolyte, or increasing the substrate concentration. For example, in a single-layer electrolytic cell, when the electrolytic cell itself was changed from glass to carbon and the electrolytic cell itself was used as an electrode, the decomposition time was reduced to about one-fifth, but in this case, Using the electrolytic cell itself as an electrode can also be a method for electrolyzing 5 times the amount of substrate at the same time.

Further, each harmful organic compound undergoes ring cleavage in an aprotic electrolytic solution and is decomposed into a low molecular weight compound having almost no toxicity. Since this decomposition is irreversible, in the case of a two-layer electrolytic cell, harmful organic compounds in both electrolytic solutions can be decomposed by reversing the electrode load potential on the anode side and the cathode side. In the case of a single-layer type non-diaphragm electrolytic cell, the harmful organic compounds in both electrolytic solutions can be decomposed by reversing the electrode load potential of the platinum electrode as the working electrode and the carbon electrode as the counter electrode. In addition, the present invention can electrochemically decompose harmful organic compounds into safe low-molecular compounds in a short time and in energy saving. Since the equipment is small and does not require special use conditions (high temperature and high pressure),
It is applicable for industrial use and general household use.

[0039]

[Brief description of the drawings]

FIG. 1 is an explanatory view of a two-layer electrolytic cell showing a method for decomposing harmful organic compounds according to one embodiment of the present invention.

FIG. 2 is an explanatory view of a one-layer type diaphragm-free electrolytic cell showing a method for decomposing harmful organic compounds according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Platinum electrode (working electrode) 12 Reference electrode (Ag / Ag ⁺ ) 13 Carbon platinum electrode (counter electrode) 14 Diaphragm 15 Two-layer electrolytic tank 16 Stirrer 17 Porous plug 18 Anode-side electrolytic tank 19 Cathodic-side electrolytic tank 20 Electrolysis Solution 30 1-layer type non-diaphragm electrolytic cell

Claims (14)

[Claims] An object to be treated containing a harmful organic compound is dissolved in an aprotic solvent to form a two-layer electrolytic cell or a three-layer electrolytic cell having a diaphragm dividing an anode side and a cathode side. A method for decomposing harmful organic compounds, comprising decomposing harmful organic compounds by conducting electrochemical decomposition by applying a current at a positive oxidation potential or a negative reduction potential. 2. An object to be treated containing harmful organic compounds is dissolved in an aprotic solvent to form a non-diaphragm electrolytic cell having no diaphragm separating an anode side and a cathode side in an electrolytic cell, and having a positive oxidation potential. Alternatively, a method for decomposing harmful organic compounds, characterized in that harmful organic compounds are decomposed, wherein electrochemical decomposition is performed by applying an electric current with a negative reduction potential. 3. An object to be treated containing a harmful organic compound is dissolved in an aprotic solvent to form a two-layer electrolytic cell or a three-layer electrolytic cell having a diaphragm separating an anode side and a cathode side in an electrolytic cell. Decompose harmful organic compounds characterized by decomposing harmful organic compounds by providing a reference electrode for voltage setting and conducting electrochemical decomposition by applying a positive oxidation potential or a negative reduction potential. Method. 4. An object to be treated containing a harmful organic compound is dissolved in an aprotic solvent to form a non-diaphragm electrolytic cell having no diaphragm for separating an anode side and a cathode side in an electrolytic cell. A method for decomposing harmful organic compounds, comprising decomposing harmful organic compounds by performing electrochemical decomposition by providing a reference electrode and applying a current at a positive oxidation potential or a negative reduction potential. 5. The harmful organic substance according to claim 1, wherein the object containing the harmful organic compound is bisphenol A used as a raw material for producing a polycarbonate resin or an epoxy resin. A method for decomposing compounds. 6. The method for decomposing harmful organic compounds according to claim 1, wherein the object to be treated containing harmful organic compounds is styrene, which is a by-product of a process for producing expanded polystyrene. 7. An object to be treated containing harmful organic compounds is coal tar treatment, petroleum refining, coke production, kerosene treatment,
The method for decomposing harmful organic compounds according to any one of claims 1 to 4, wherein the harmful organic compound is 1,2-benzopyrene generated from a manufacturing process such as power generation. 8. The method for decomposing harmful organic compounds according to claim 1, wherein the object to be treated containing harmful organic compounds is an alkylphenol or nonylphenol which is a raw material of a surfactant. 9. DDTs such as dichlorodiphenyltrichloroethane and methoxychlor, wherein the object to be treated containing harmful organic compounds is an organochlorine compound agricultural pesticide;
In addition, aldrin, endrin, chlordane, dieldrin, heptachlor, heptachlor epoxide,
5. The method for decomposing harmful organic compounds according to claim 1, wherein the method is 2,4,5-trichlorophenoxyacetic acid. 10. The method for decomposing harmful organic compounds according to claim 1, wherein the object to be treated containing harmful organic compounds is polychlorinated biphenyls containing coplanar PCB. 11. The process according to claim 1, wherein the object to be treated containing harmful organic compounds is tetrachloroethylene, trichloroethylene, which is an industrial wastewater pollutant, or chlorofluorocarbons used for cooling. Decomposition method of harmful organic compounds. 12. The object to be treated containing harmful organic compounds is biphenyl, 2,2-dihydroxybiphenyl, 2,3
The method for decomposing harmful organic compounds according to any one of claims 1 to 4, wherein the method is a biphenyl such as dihydroxybiphenyl. 13. The object to be treated containing harmful organic compounds is 2,4-dichlorophenol, 2,5-dichlorophenol, 2,6-dichlorophenol, 3,4-dichlorophenol, 3,5-dichlorophenol. 2,4,5-
The harmful organic compound according to any one of claims 1 to 4, which is a polychlorophenol such as trichlorophenol, 2,4,6-trichlorophenol, 2,4,5,6 tetrachlorophenol, and pentachlorophenol. How to decompose. 14. The harmful organic compound according to claim 1, wherein the object to be treated containing the harmful organic compound is chlorobenzene, chloroaniline, chloroanisole, chloronitrobenzene. Decomposition method.