Zinc metal eutectic, preparation method and application of zinc metal eutectic in photocatalytic degradation of chemical warfare agent

Abstract

The invention discloses a zinc metal eutectic, a preparation method and application of the zinc metal eutectic in photocatalytic degradation of a chemical warfare agent. The zinc metal eutectic is synthesized by taking pyrene, 7, 7, 8, 8-tetracyanobenzoquinone dimethane and zinc acetate dihydrate as raw materials and adding an organic solvent through a simple solvent evaporation method, and the product is marked as Zn < 2 + >-TCNQ-Py. The zinc metallization eutectic can be obtained through a simple and low-cost solvent evaporation method, and the defects that the yield is low and time is consumed are overcome. Meanwhile, Zn < 2 + >-TCNQ-Py has strong active oxygen generation capability, can be used for photocatalytic degradation of a chemical warfare agent mustard gas simulant into low-toxicity 2-chloroethyl ethyl sulfoxide, and not only has excellent degradation efficiency, but also has relatively good cycle stability and relatively high practical application value.

Description

Technical Field

[0001] The invention relates to the fields of material preparation technology and environmental chemistry, and in particular to a method for preparing zinc metal eutectic and application thereof in detoxifying mustard gas simulants. Background Art

[0002] Chemical warfare agents (CWAs) were first used in large quantities during the World War. Although they have been banned since then, there are still large stocks of chemical warfare agents in some countries that have not been destroyed. At present, research on the detoxification of chemical warfare agents mainly focuses on nerve agents, blistering agents, etc., among which one of the representatives of blistering agents is sulfur mustard (HD) - bis (2-chloroethyl) sulfide. HD is the most produced, stored and even used chemical warfare agent to date. It is called the "king of poison agents". Its strong, rapid and long-lasting toxic effects pose a serious threat to global social security. HD is a vesicular agent that is harmful to human proteins and human DNA. It can not only cause skin blisters, irritate the eyes, damage the respiratory tract, but also lead to fatal death.

[0003] At present, there are three main ways to degrade sulfur mustard, namely dehydrohalogenation, hydrolysis and oxidation. Among them, the rate of dehydrohalogenation degradation is too slow to be effectively applied to the degradation of sulfur mustard, and hydrolysis is also limited by its poor solubility in water and susceptibility to intermediate products. At present, the most effective way to degrade sulfur mustard is to use a mild oxidant to selectively oxidize sulfide to non-toxic sulfoxide instead of completely oxidizing it to highly toxic sulfone. Usually, the less toxic HD analog - 2-chloroethyl ethyl sulfide (CEES) is used as the degradation object in experiments. CEES is oxidized to low-toxic 2-chloroethyl ethyl sulfoxide (CEESO) by generating active oxygen through photosensitizer. This method is not only efficient but also simple and safe to operate. At present, a variety of materials for photocatalytic oxidation degradation of CEES have been studied. Such photosensitizers usually need to meet the following two conditions: ① can quickly generate a large amount of active oxygen; ② provide sufficient catalytic active sites. Metal organic frameworks (MOFs) contain abundant metal catalytic sites and have been successfully used as photosensitizers for the rapid and selective detoxification of HD or its analog CEES. However, the stability of MOFs needs to be improved, and the synthesis of MOFs usually requires high temperature conditions and a long time. Eutectic engineering has been proven to be an effective method to improve the optoelectronic properties of organic materials, and has great potential in the fields of organic field-effect transistors, organic photovoltaics, and near-infrared photothermal imaging. However, the use of organic eutectic strategies to develop their photocatalytic degradation applications still faces challenges. So far, there has been no application of eutectic materials in the degradation of mustard gas simulants. Doping metals in eutectic materials is expected to make up for the shortcomings of MOFs and expand their photocatalytic applications. However, the preparation of metal eutectics still has the disadvantages of cumbersome steps, time-consuming, and poor stability, which greatly limits its practical application.

[0004] Therefore, how to provide a metal eutectic with a simple preparation method, good stability and excellent photocatalytic performance for the efficient degradation of chemical warfare agent-mustard gas simulants is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a zinc metal eutectic, a preparation method and its application in the photocatalytic degradation of chemical warfare agents.

[0006] It should be noted that the zinc metal eutectic material prepared by the method of the present invention has the characteristics of simple synthesis, stable material and environmental friendliness. The zinc metal eutectic can generate a large amount of singlet oxygen ( 1 O 2 ) and superoxide anion (O 2 ·- ), which can photocatalytically degrade the mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) into low-toxic 2-chloroethyl ethyl sulfoxide (CEESO), and has the characteristics of fast degradation rate, high efficiency, good selectivity and excellent recycling performance.

[0007] In order to achieve the above purpose, the following technical solutions are adopted:

[0008] The first technical purpose of the present invention is to provide a zinc metal eutectic, which is synthesized by solvent evaporation method using pyrene, 7,7,8,8-tetracyanoquinodimethane and zinc acetate dihydrate as raw materials and adding organic solvent. The product is marked as: Zn 2+ -TCNQ-py.

[0009] The second technical purpose of the present invention is to provide a method for preparing the zinc metal eutectic as described above, which is a one-step preparation method of the zinc metallization eutectic material, specifically comprising the following steps:

[0010] Add 7,7,8,8-tetracyanoquinodimethane and an organic solvent to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate to the glass bottle. Add pyrene and an organic solvent to another glass bottle, disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a certain proportion, and react them at room temperature for 1-12 hours. After the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-py.

[0011] Optionally, the molar ratio of pyrene, 7,7,8,8-tetracyanobenzoquinodimethane and zinc acetate dihydrate is (1-3):(1-2):(1-2), and the preferred molar ratio of pyrene, 7,7,8,8-tetracyanobenzoquinodimethane and zinc acetate dihydrate is 3:2:1.

[0012] Optionally, the organic solvent is acetic acid or acetonitrile, and the amount of the organic solvent added is such that the concentration of pyrene is (0.01-0.03) mmol / mL, the concentration of 7,7,8,8-tetracyanobenzoquinone dimethane is (0.01-0.02) mmol / mL, and the concentration of zinc acetate dihydrate is (0.01-0.02) mmol / mL.

[0013] Preferably, the organic solvent is acetonitrile, and the amount of acetonitrile added is such that the concentration of pyrene is 0.03 mmol / mL, the concentration of 7,7,8,8-tetracyanobenzoquinodimethane is 0.02 mmol / mL, and the concentration of zinc acetate dihydrate is 0.01 mmol / mL.

[0014] Optionally, the mixing ratio of 7,7,8,8-tetracyanobenzoquinone dimethane and zinc acetate dihydrate solution to the pyrene solution is 1:(1-3), and the preferred volume ratio of 7,7,8,8-tetracyanobenzoquinone dimethane and zinc acetate dihydrate solution to the pyrene solution is 1:1.

[0015] The third technical purpose of the present invention is to provide an application of a zinc metal eutectic obtained by the above-mentioned preparation method in the photocatalytic degradation of a chemical warfare agent-mustard gas simulant, specifically the application of a zinc metal eutectic in the photocatalytic degradation of a sulfur mustard simulant 2-chloroethyl ethyl sulfide (CEES).

[0016] A method for photocatalytic degradation of trace sulfur mustard simulants by zinc metal eutectic, comprising the following steps:

[0017] (1) 2 mg of prepared Zn 2+ -TCNQ-Py is placed in a reaction device that can be magnetically stirred, and the device is filled with oxygen after checking the airtightness;

[0018] (2) Use a syringe to add 1 mL of deuterated methanol (CD 3 OD-d4), 3.4 μL of dibromomethane and 5.6 μL of a mixed solution of mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) were injected into the device and ultrasonicated for 1-10 minutes;

[0019] (3) irradiating the reaction with simulated sunlight and taking samples at different time intervals to monitor the reaction rate;

[0020] (4) Determination of reaction products 1 HNMR, calculation of the degradation rate of sulfur mustard simulants.

[0021] Compared with the prior art, the present invention is beneficial in that:

[0022] 1. The present invention can quickly synthesize zinc metallization eutectic materials at room temperature by a simple solvent evaporation method. The synthesis method is simple, fast, low-cost and environmentally friendly.

[0023] 2. The zinc metal eutectic Zn prepared by the method of the present invention 2+ -TCNQ-Py can generate singlet oxygen ( 1 O 2 ) and superoxide anion (O 2 ·- ).

[0024] 3. The zinc metal eutectic Zn prepared by the method of the present invention 2+ -TCNQ-Py has high catalytic activity and can rapidly degrade the mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) into low-toxic 2-chloroethyl ethyl sulfoxide (CEESO) under light conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 It is zinc metal eutectic Zn 2+ -XRD pattern of TCNQ-Py.

[0027] Figure 2 It is zinc metal eutectic Zn 2+ -EDS elemental distribution map of TCNQ-Py.

[0028] Figure 3 It is zinc metal eutectic Zn 2+ -TCNQ-Py in O 2 Photocatalytic degradation of CEES under atmosphere and xenon lamp simulated sunlight irradiation conditions 1 HNMR spectrum.

[0029] Figure 4 It is zinc metal eutectic Zn 2+ -TCNQ-Py photocatalytic degradation of CEES under actual air atmosphere and xenon lamp simulated sunlight irradiation conditions 1 HNMR spectrum.

[0030] Figure 5 Zn prepared at different volume ratios 2+ -The time required for complete photocatalytic degradation of CEES by TCNQ-Py.

[0031] Figure 6 The effects of different scavengers on Zn 2+-TCNQ-Py catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) color development.

[0032] Figure 7 It is zinc metal eutectic Zn 2+ EPR spectra of -TCNQ-Py mixed with TEMP under visible light irradiation or in the dark.

[0033] Figure 8 It is zinc metal eutectic Zn 2+ EPR spectra of -TCNQ-Py mixed with DMPO under visible light irradiation or in the dark.

[0034] Fig. 9 It is zinc metal eutectic Zn 2+ -TCNQ-Py photocatalytic degradation of CEES cycle experiment 5 times 1 HNMR spectrum. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The word "embodiment" used here as an "exemplary" does not necessarily mean that any embodiment described is superior to or better than other embodiments. Unless otherwise specified, the performance index tests in the embodiments of this application are performed using conventional test methods in the art. It should be understood that the terms described in this application are only used to describe specific implementation methods and are not used to limit the content disclosed in this application.

[0037] Unless otherwise specified, the technical and scientific terms used in this document have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0038] In order to better illustrate the content of the present application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0039] Under the premise of no conflict, the technical features disclosed in the embodiments of the present application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present application.

[0040] The invention discloses a zinc metal eutectic, a preparation method and application thereof in photocatalytic degradation of chemical warfare agents.

[0041] In order to better understand the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as a limitation of the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the protection scope of the present invention.

[0042] Embodiment 1:

[0043] A method for preparing a zinc metal eutectic material comprises the following steps:

[0044] Add 7,7,8,8-tetracyanoquinodimethane (20.4 mg, 0.10 mmol) and organic solvent acetonitrile (5 mL) to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate (10.9 mg, 0.05 mmol) to the glass bottle. Add pyrene (30.3 mg, 0.15 mmol) and organic solvent acetonitrile (5 mL) to another glass bottle and disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a volume ratio of 1:1, and react at room temperature for 2 hours; after the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

[0045] Embodiment 2:

[0046] A method for preparing a zinc metal eutectic material comprises the following steps:

[0047] Add 7,7,8,8-tetracyanoquinodimethane (20.4 mg, 0.10 mmol) and organic solvent acetonitrile (5 mL) to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate (10.9 mg, 0.05 mmol) to the glass bottle. Add pyrene (60.6 mg, 0.30 mmol) and organic solvent acetonitrile (10 mL) to another glass bottle and disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a volume ratio of 1:2, and react at room temperature for 2 hours; after the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

[0048] Embodiment 3:

[0049] A method for preparing a zinc metal eutectic material comprises the following steps:

[0050] Add 7,7,8,8-tetracyanoquinodimethane (10.2 mg, 0.10 mmol) and organic solvent acetonitrile (5 mL) to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate (10.9 mg, 0.05 mmol) to the glass bottle. Add pyrene (90.9 mg, 0.45 mmol) and organic solvent acetonitrile (15 mL) to another glass bottle and disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a volume ratio of 1:3, and react at room temperature for 2 hours; after the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

[0051] In order to further demonstrate the beneficial effects of the present invention and to better understand the present invention, the following comparative examples and application examples are used to further illustrate the technical features disclosed in the present invention, but they should not be understood as limitations of the present invention. Other improvements made by those skilled in the art based on the above invention content without creative work are also considered to fall within the scope of protection of the present invention.

[0052] Comparative Example 1

[0053] Add 7,7,8,8-tetracyanoquinodimethane (20.4 mg, 0.10 mmol) and organic solvent acetonitrile (5 mL) to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc chloride (6.8 mg, 0.05 mmol) to the glass bottle. Add pyrene (30.3 mg, 0.15 mmol) and organic solvent acetonitrile (5 mL) to another glass bottle and disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a volume ratio of 1:1, and react at room temperature for 2 hours; after the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

[0054] Comparative Example 2

[0055] Add 7,7,8,8-tetracyanoquinodimethane (20.4 mg, 0.10 mmol) and organic solvent ethanol (5 mL) to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate (10.9 mg, 0.05 mmol) to the glass bottle. Add pyrene (30.3 mg, 0.15 mmol) and organic solvent ethanol (5 mL) to another glass bottle and disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a volume ratio of 1:1 and react at room temperature for 2 hours; after the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

[0056] Experiment 1: Zinc metal eutectic Zn 2+-Application of TCNQ-Py in the detoxification of mustard gas simulant 2-chloroethyl ethyl sulfide (CEES)

[0057] 2 mg of zinc metal eutectic Zn obtained in Example 1 2+ -TCNQ-Py was placed in a sealed glass apparatus equipped with magnetic stirring and stirred with O 2 Bubble for 20 minutes, and inject deuterated methanol (CD 3 A mixture of OD-d4), dibromomethane and mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) was injected into a glass bottle. After five minutes of ultrasound, it was irradiated with simulated sunlight and samples were taken at different time intervals to monitor the reaction rate.

[0058] Experiment 2: Zinc Metal Eutectic Zn 2+ -Application of TCNQ-Py in detoxification of mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) in real air

[0059] 2 mg of zinc metal eutectic Zn obtained in Example 1 2+ -TCNQ-Py was placed in a glass apparatus equipped with magnetic stirring. The valve was opened to allow ambient air to flow in. Deuterated methanol (CD 3 OD-d4)), a mixture of dibromomethane and mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) was injected into a glass bottle. After five minutes of ultrasound, it was irradiated with simulated sunlight and samples were taken at different time intervals to monitor the reaction rate.

[0060] Experiment 3: Zinc Metal Eutectic Zn 2+ Cyclic stability experiment of photocatalytic degradation of mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) by TCNQ-Py

[0061] 2 mg of zinc metal eutectic Zn obtained in Example 1 2+ -TCNQ-Py was placed in a sealed glass apparatus equipped with magnetic stirring and stirred with O 2 Bubble for 20 minutes, and inject deuterated methanol (CD 3 OD-d4), a mixture of dibromomethane and mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) was injected into a glass bottle, and after five minutes of ultrasound, it was irradiated with simulated sunlight and sampled and measured after the reaction. 1 H NMR spectrum. Deuterated methanol (CD 3 OD-d4), dibromomethane and mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) were injected into a glass bottle for photocatalytic reaction, and then samples were taken for determination. 1 H NMR spectrum; after five repetitions, Zn 2+-TCNQ-Py still has an efficiency of over 90% in degrading the mustard gas simulant 2-chloroethyl ethyl sulfide and has good cyclic stability.

[0062] The specific results are analyzed as follows:

[0063] Figure 1 The Zn prepared in Example 1 2+ -TCNQ-Py powder X-ray diffraction (PXRD) pattern. Zn 2+ -TCNQ-Py still maintains a high degree of crystallinity, indicating that the introduction of metal does not destroy the crystal structure of the eutectic.

[0064] Figure 2 The Zn prepared in Example 1 2+ -EDS pattern of TCNQ-Py. Zn 2+ -TCNQ-Py has a rod-like morphology, and the C, N, and Zn elements are evenly distributed in the material, which further indicates that metal Zn has been successfully introduced into the TCNQ-Py eutectic.

[0065] Figure 3 The Zn prepared in Example 1 under simulated sunlight irradiation 2+ -TCNQ-Py photocatalytic oxidation of CEES 1 H NMR spectrum. Under light conditions, Zn 2+ -TCNQ-Py has high catalytic activity in O 2 It only takes 6 minutes for CEES to be completely converted into the non-toxic oxidation product CEESO under the atmosphere. Even after 40 minutes of reaction, no toxic CEESO was detected. 2 product, indicating that 100% selectivity was achieved.

[0066] Figure 4 The Zn prepared in Example 1 under simulated sunlight in air 2+ -TCNQ-Py photocatalytic oxidation of CEES 1 H NMR spectrum. Under actual air atmosphere conditions, Zn 2+ -TCNQ-Py still has high catalytic activity, degrading 70% of CEES in 5 minutes and completely converting CEES into non-toxic oxidation product CEESO in 20 minutes, and no toxic CEESO was detected. 2 products, indicating that 100% selectivity was also achieved under actual air conditions.

[0067] Figure 5 The Zn prepared in different volume ratios in Examples 1-3 2+ -TCNQ-Py in simulating sunlight irradiation and O 2The time required for CEES to be completely converted into the non-toxic oxidation product CEESO under the atmosphere. As the volume ratio of pyrene solution increases, the prepared Zn 2+ The efficiency of photocatalytic oxidation of CEES by -TCNQ-Py gradually decreased, and the optimal volume ratio was 1:1.

[0068] Figure 6 It is Zn 2+ -TCNQ-Py photocatalytic oxidation process was investigated, and tryptophan (Trp), ascorbic acid (AA), catalase (CAT) and isopropyl alcohol (IPA) were selected as 1 O 2 , O 2 ·- , H 2 O 2 The oxidation color of 3,3′,5,5′-tetramethylbenzidine (TMB) was significantly inhibited after the addition of Trp and AA, while the effects of other scavengers on the absorbance were negligible, indicating that the main scavenger produced during the photocatalytic process was 1 O 2 and O 2 ·- .

[0069] Figure 7 Using TEMP as a probe, Zn 2+ -Electron paramagnetic resonance (EPR) spectra of TCNQ-Py under light or dark conditions. Under light conditions, the EPR spectrum appears 1 O 2 The characteristic triplet signal is not observed in the EPR spectrum under dark conditions. 1 O 2 The EPR results show that Zn 2+ -TCNQ-Py can rapidly produce a large amount of 1 O 2 , and then oxidizes CEES to CEESO.

[0070] Figure 8 DMPO was used as a probe, Zn 2+ Electron paramagnetic resonance (EPR) spectra of -TCNQ-Py under light or dark conditions. Under light conditions, the EPR spectrum shows O 2 ·- However, no O was observed in the EPR spectrum under dark conditions. 2 · -characteristic peak. EPR results show that Zn 2+ -TCNQ-Py can rapidly generate a large amount of O under light 2· -, and then oxidizes CEES to CEESO.

[0071] Fig. 9 Zn 2+ Photocatalytic degradation of mustard gas simulant 2-chloroethyl ethyl sulfide (CEES) by -TCNQ-Py for five cycles 1 H NMR spectrum. After five repeated cycles, Zn 2+ -TCNQ-Py photooxidative detoxification CEES has an efficiency of over 90% and good cycle stability, which has advantages in practical applications.

[0072] The above results show that Zn 2+ -TCNQ-Py is an excellent material for rapid and safe degradation of CEES.

[0073] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A zinc metal eutectic, characterized in that: The zinc metal eutectic is synthesized by using pyrene, 7,7,8,8-tetracyanoquinodimethane and zinc acetate dihydrate as raw materials, adding an organic solvent and synthesizing by solvent evaporation method. The product is marked as: Zn 2+ -TCNQ-py.

2. A method for preparing a zinc metal eutectic as claimed in claim 1, characterized in that: The specific steps include: Add 7,7,8,8-tetracyanoquinodimethane and an organic solvent to a glass bottle, disperse it in an ultrasonic instrument, and then add zinc acetate dihydrate to the glass bottle. Add pyrene and an organic solvent to another glass bottle, disperse it in an ultrasonic instrument. Mix the solutions in the two glass bottles in a certain proportion, and react them at room temperature for 1-12 hours. After the reaction is completed, filter and wash with water and methanol, and dry to obtain Zn 2+ -TCNQ-Py, namely the zinc metal eutectic.

3. The method for preparing zinc metal eutectic according to claim 2, characterized in that: The molar ratio of pyrene, 7,7,8,8-tetracyanobenzoquinone dimethane and zinc acetate dihydrate is (1-3): (1-2): (1-2).

4. The method for preparing zinc metal eutectic according to claim 2, characterized in that: The organic solvent is acetic acid or acetonitrile, and the amount of the organic solvent added is such that the concentration of pyrene is (0.01-0.03) mmol / mL, the concentration of 7,7,8,8-tetracyanobenzoquinodimethane is (0.01-0.02) mmol / mL, and the concentration of zinc acetate dihydrate is (0.01-0.02) mmol / mL.

5. The method for preparing zinc metal eutectic according to claim 2, characterized in that: The mixing ratio of 7,7,8,8-tetracyanobenzoquinone dimethane and zinc acetate dihydrate solution to pyrene solution is 1:(1-3).

6. Use of the zinc metal eutectic as claimed in claim 1 or the zinc metal eutectic obtained by the method as claimed in claim 2 in the photocatalytic degradation of chemical warfare agent-mustard gas simulant.

7. The use according to claim 6, characterized in that: In the method for photocatalytic degradation of trace mustard gas simulants by zinc metal eutectic, the zinc metal eutectic can selectively oxidize 2-chloroethyl ethyl sulfide (CEES) to low-toxic 2-chloroethyl ethyl sulfoxide (CEESO).

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