A water treatment method based on electron beam irradiation to generate singlet oxygen

Abstract

This invention provides a water treatment method based on electron beam irradiation to generate singlet oxygen, belonging to the field of water treatment technology. The aim is to propose a universal method for generating singlet oxygen in water treatment processes. The method includes: adding a metal salt to the wastewater to be treated and stirring until a mixed solution is obtained; wherein the metal salt includes reducing metal ions; continuously aerating the mixed solution with air to enrich it with oxygen; and subjecting the oxygen-rich mixed solution to electron beam irradiation, so that the reducing metal ions synergistically activate the oxygen in the mixed solution to generate singlet oxygen, thereby removing new pollutants from the wastewater to be treated.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a water treatment method based on electron beam irradiation to generate singlet oxygen. Background Technology

[0002] New pollutants are a class of pollutants that have been identified in recent years, including antibiotics, hormonal drugs, and endocrine disruptors. These pollutants are characterized by low concentration, high toxicity, persistence, bioaccumulation, and environmental degradation, and may pose a potential threat to ecosystems and human health.

[0003] Current methods for treating new pollutants generally employ advanced oxidation technologies (AOs), which utilize activated oxidants to generate highly oxidizing free radicals that react with the new pollutants in the water, thereby degrading and mineralizing them. However, actual water bodies contain other types of pollutants besides new pollutants, such as humic acid. The free radicals generated by the activated oxidants in AOs react not only with new pollutants but also with other types of pollutants, leading to competition for these reactions. Since new pollutants are generally present at low concentrations in wastewater, their ability to compete for free radicals is at a disadvantage, rendering free radical-based AOs ineffective in removing new pollutants from water bodies.

[0004] Singlet oxygen ( 1 Oxygen (O2) is a non-radical reactive species with strong oxidizing activity, good selectivity, few byproducts, and the ability to operate under neutral pH conditions. It has become a commonly used active oxidation technology for efficient disinfection, degradation of organic pollutants, and decolorization and deodorization. In the field of water treatment, singlet oxygen can directly oxidize recalcitrant trace organic pollutants (such as endocrine disruptors and antibiotic residues) and inactivate bacteria, viruses, and algae, offering advantages such as no secondary pollution, low operating costs, and simple equipment.

[0005] However, current methods for generating singlet oxygen include photosensitization and chemical methods. The photosensitization method is difficult to apply to wastewater treatment with high color, turbidity, or light-sensitive systems. Although the chemical method does not require an external light source, it is usually accompanied by a large number of by-products. Therefore, there is an urgent need for a universal method for preparing singlet oxygen with fewer by-products to improve the universality of singlet oxygen for water treatment. Summary of the Invention

[0006] In view of this, the present invention aims to propose a water treatment method based on electron beam irradiation to generate singlet oxygen, the method comprising:

[0007] A metal salt is added to the wastewater to be treated and stirred until a mixed solution is obtained; wherein the metal salt includes reducing metal ions;

[0008] Air is continuously introduced into the mixed solution to enrich it with oxygen;

[0009] The oxygen-rich mixed solution is irradiated with an electron beam to enable the reducing metal ions to work in conjunction with the electron beam irradiation to activate the oxygen in the mixed solution to generate singlet oxygen, thereby removing pollutants from the wastewater to be treated.

[0010] Optionally, prior to irradiating the oxygen-rich mixed solution with an electron beam, the method further includes:

[0011] A free radical quencher is added to the mixed solution to remove excess hydroxyl radicals during the electron beam irradiation process;

[0012] The free radical quencher includes any one of methanol, ethanol, tert-butanol, and n-butanol.

[0013] Optionally, the dosage of the free radical quencher is 10-100 mmol / L.

[0014] Optionally, the metal salt includes at least one of CeCl3, MnCl2, CoCl2, FeCl2, and RuCl2.

[0015] Optionally, the amount of metal salt added is 1-10 mmol / L.

[0016] Optionally, the ratio between the irradiation dose of the electron beam and the amount of metal salt added is 1 kGy: 0.1-0.5 mmol.

[0017] Optionally, the ratio between the irradiation dose of the electron beam and the amount of metal salt added is 1 kGy: 0.37 mmol.

[0018] Optionally, the irradiation dose of the electron beam is 1-50 kGy.

[0019] Optionally, the irradiation source for the electron beam irradiation is an electron accelerator. 60 Co and 137 Any of the following in Cs.

[0020] Optionally, the contaminants include at least one of antibiotics, endocrine disruptors, pesticides, and phenolic organic pollutants.

[0021] The present invention provides a water treatment method based on electron beam irradiation to generate singlet oxygen, comprising: adding a metal salt to wastewater to be treated and stirring until homogeneous to obtain a mixed solution; wherein the metal salt includes reducing metal ions; continuously aerating the mixed solution with air to enrich the mixed solution with oxygen; and subjecting the oxygen-rich mixed solution to electron beam irradiation, so that the reducing metal ions synergistically activate the oxygen in the mixed solution to generate singlet oxygen, thereby removing pollutants from the wastewater to be treated;

[0022] Therefore, this invention achieves continuous, controllable, and high-yield preparation of singlet oxygen by adding a metal salt with reducing metal ions to the wastewater to be treated, followed by electron beam irradiation after air is introduced. During this process, the hydrated electrons generated by electron beam irradiation react with oxygen to produce superoxide anions, and the hydroxyl radicals generated by electron beam irradiation react with the reducing metal ions to oxidize them into higher valence metal ions. Subsequently, the higher valence metal ions react with superoxide anions to obtain singlet oxygen and metal ions that return to their original valence state. In this process, no organic sensitizer or excess oxidant is required, no excess byproducts are generated, and the metal ions can be recycled. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A flowchart illustrating the steps of a water treatment method based on electron beam irradiation to generate singlet oxygen, as provided in an embodiment of the present invention, is shown. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. Where specific experimental steps or conditions are not specified in the embodiments, they can be performed according to the conventional experimental steps or conditions described in the prior art. Reagents and other instruments used, unless otherwise specified, are all commercially available conventional reagent products.

[0026] In recent years, the treatment of new pollutants has received significant attention, highlighting its urgency. Advanced oxidation technologies (AOs) utilize activated oxidants to generate highly oxidizing free radicals that react with new pollutants in water, achieving degradation and mineralization. However, actual water bodies contain other substances besides new pollutants. Free radicals react not only with new pollutants but also with other substances in the water, such as humic acid. Due to the low concentration of new pollutants in actual wastewater, they are at a disadvantage in the competition for free radicals, rendering AOs based on free radicals ineffective in removing new pollutants from water bodies. Singlet oxygen (Singlet oxygen) 1 Oxygen ions (O2) are non-free radical reactive species. Due to their extremely strong oxidizing activity, good selectivity, few byproducts, and ability to function under neutral pH conditions, they have become an important reactive oxygen species technology for efficient disinfection, degradation of organic pollutants, and decolorization and deodorization. In the field of water treatment, 1 O2 can directly oxidize recalcitrant trace organic pollutants (such as endocrine disruptors and antibiotic residues) and inactivate bacteria, viruses, and algae, offering advantages such as no secondary pollution, low operating costs, and simple equipment. However, how to effectively form singlet oxygen is a problem that urgently needs to be solved.

[0027] Currently, commonly used methods for generating singlet oxygen include photosensitization and chemical methods. Photosensitization utilizes visible or ultraviolet light to excite the triplet state of a photosensitizer, which then undergoes energy transfer with dissolved oxygen to generate singlet oxygen. The advantages of this method are mild reaction conditions and high selectivity; however, the light penetration depth is limited, resulting in lower treatment capacity for turbid or highly chromatic wastewater and making it difficult to apply to photosensitive systems. Chemical methods commonly use hydrogen peroxide systems, ferric citrate methods, etc., to generate singlet oxygen through chemical reactions. The advantage of this method is that it does not require an external light source; however, it often produces a large number of byproducts, resulting in high treatment costs, difficulty in continuous operation, and poor stability.

[0028] In view of this, the present invention provides a water treatment method based on electron beam irradiation to generate singlet oxygen. Singlet oxygen is generated by the synergistic reaction of reducing metal ions and electron beam irradiation with oxygen. High-efficiency singlet oxygen preparation can be achieved without the need for excess oxides or organic photosensitizers.

[0029] The water treatment method based on electron beam irradiation to generate singlet oxygen according to the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] Reference Figure 1 , Figure 1 A flowchart illustrating the steps of a water treatment method based on electron beam irradiation to generate singlet oxygen, as provided in an embodiment of the present invention, is shown. Figure 1 As shown, the method specifically includes:

[0031] S101, a metal salt is added to the wastewater to be treated and stirred evenly to obtain a mixed solution; wherein, the metal salt includes reducing metal ions.

[0032] The wastewater to be treated contains novel pollutants such as antibiotics and endocrine disruptors, as well as common organic pollutants such as humic acid. The metal salts added to the wastewater include reducing metal ions. These reducing metal ions react with hydroxyl radicals generated during electron beam irradiation to produce high-valence metal ions. These high-valence ions then combine with superoxide anions generated during irradiation to produce singlet oxygen. The metal salts can be hydrochlorides, sulfates, or phosphates containing reducing metal ions, and the reducing metal ions can be Ce. 3+ Co 2+ Mn 2+ Ru 2+ Fe 2+ Metal ions with reducing properties, etc.

[0033] It is important to note that after the reducing metal ions are oxidized to a higher valence state, they need to be able to be reduced back to their initial valence state so that they can be recycled during electron beam irradiation to generate singlet oxygen. Thus, a trace amount of metal salt can achieve the generation of singlet oxygen. In this case, the amount of metal salt added is 1-10 mmol. The preferred metal salt is hydrochloride to avoid residual sulfate, phosphate, and other anions affecting water quality after treatment.

[0034] S102, continuously aerate the mixed solution with air to enrich it with oxygen.

[0035] Oxygen is used as a raw material to generate singlet oxygen. By aerating the mixed solution with air, the solution becomes rich in oxygen, thereby generating sufficient singlet oxygen for pollutant removal. Specifically, at least one of the following methods—blowing aeration, surface aeration, submersible jet aeration, and submersible aeration—is used to aerate the mixed solution, either to enrich the coking wastewater with oxygen or to saturate the oxygen content of the mixed solution. The aeration time depends on the actual situation and is not specifically limited in this invention.

[0036] S103 involves irradiating an oxygen-rich mixed solution with an electron beam to activate the oxygen in the mixed solution with reducing metal ions, thereby generating singlet oxygen and removing new pollutants from the wastewater to be treated.

[0037] Specifically, after aerating the mixed solution with air, the oxygen-rich mixed solution is transferred to an irradiation device for electron beam irradiation. During electron beam irradiation, hydrated electrons and hydroxyl radicals are generated. Hydrated electrons can reduce oxygen to superoxide anions, and hydroxyl radicals oxidize reducing metal ions to a higher valence state. Subsequently, superoxide anions react with the higher valence metal ions to obtain singlet oxygen, which reduces the higher valence metal ions to reducing metal ions. Singlet oxygen has high selectivity for new pollutants such as antibiotics and endocrine disruptors, and can remove new pollutants from wastewater.

[0038] Understandably, during the generation of singlet oxygen, reducing metal ions are oxidized to a higher valence state and then reduced back to their initial valence state. Therefore, there is no need to continuously replenish reducing metal ions during the reaction, and the demand for reducing metal ions is low, resulting in a low residual amount of metal ions in the treated wastewater, which will not affect water quality. Similarly, the initial addition of reducing metal ions does not need to be excessive; it is sufficient to convert the superoxide anions obtained from the reaction into singlet oxygen.

[0039] The water treatment method based on electron beam irradiation to generate singlet oxygen provided in this invention involves adding a metal salt to the wastewater to be treated and aerating the mixed solution with air to enrich it with oxygen. The mixed solution is then irradiated with an electron beam. The hydrated electrons generated by the electron beam irradiation react with oxygen to generate superoxide anions. Hydroxyl radicals react with reducing metal ions in the metal salt to obtain high-valence metal ions. Subsequently, the superoxide anions react with the high-valence metal ions to generate singlet oxygen and reducing metal ions. The reducing metal ions can be recycled during the generation of singlet oxygen, resulting in a small addition amount. Therefore, there are no excessive byproducts in the generation of singlet oxygen, eliminating the need for post-treatment of excess byproducts during wastewater treatment, reducing treatment costs. Furthermore, electron beam irradiation is unaffected by the turbidity or color of the wastewater to be treated, making this singlet oxygen generation process applicable to wastewater treatment in various scenarios and exhibiting high versatility.

[0040] In one embodiment, a radical quencher can be added before electron beam irradiation to quench hydroxyl radicals generated by electron beam irradiation, thereby promoting the conversion of oxygen into singlet oxygen. Specifically, the radical quencher can be added to the mixed solution to remove excess hydroxyl radicals during electron beam irradiation.

[0041] The free radical quencher can be added before the metal salt, after the salt, or after air exposure; this embodiment is not limited to these steps. The free radical quencher can be any one of methanol, ethanol, tert-butanol, or n-butanol.

[0042] In one embodiment, the dosage of the free radical quencher is 10-100 mmol / L.

[0043] In this embodiment, the dosage of the free radical quencher can be determined based on the irradiation dose. Excessive dosage of the free radical quencher may prevent some superoxide anions from being converted into singlet oxygen, thus reducing the yield of singlet oxygen. Therefore, the dosage of the free radical quencher should not be too high, and should be between 10-100 mmol / L.

[0044] For example, the dosage of free radical quencher can be 10 mmol / L, 30 mmol / L, 50 mmol / L, 70 mmol / L, or 90 mmol / L, etc.

[0045] In one embodiment, the metal salt includes at least one of CeCl3, MnCl2, CoCl2, FeCl2, and RuCl2.

[0046] In this case, the reducing metal ions included in the metal salt can be oxidized to a higher valence state by hydroxyl radicals, and then reduced to their initial valence state by reacting with superoxide anions. Therefore, the reducing metal ions can be Ce... 3+ Co 2+ Mn 2+ Ru 2+ Fe 2+ Reducible metal ions, after being oxidized to a high valence state, possess oxidizing properties and can be reduced to their initial valence state by reacting with superoxide anions.

[0047] In one embodiment, the amount of metal salt added is 1-10 mmol / L.

[0048] In this embodiment, to avoid excessive addition of metal salts leading to a large number of impurity ions in the treated water and affecting water quality, the dosage of metal salts can be 1-10 mmol / L.

[0049] For example, the dosage of metal salt can be 1 mmol / L, 3 mmol / L, 5 mmol / L, 7 mmol / L, or 9 mmol / L, etc.

[0050] In one embodiment, the ratio between the electron beam irradiation dose and the amount of metal salt added is 1 kGy: 0.1-0.5 mmol.

[0051] In this embodiment, the amount of metal salt added is related to the irradiation dose of the electron beam irradiation. The irradiation dose of the electron beam irradiation determines the amount of hydrated electrons and hydroxyl radicals generated in the mixed solution, while the amount of metal salt added determines the amount of superoxide anions converted into singlet oxygen. When the ratio between the irradiation dose of the electron beam irradiation and the amount of metal salt added is 1 kGy: 0.1-0.5 mmol, most of the superoxide anions generated during the electron beam irradiation process are converted into singlet oxygen, resulting in a high yield of singlet oxygen.

[0052] When the ratio between the electron beam irradiation dose and the amount of metal salt added is 1 kGy: 0.27 mmol, the superoxide anions generated during the electron beam irradiation process can be completely converted into singlet oxygen. At this time, the singlet oxygen has a high yield and the amount of metal salt added is relatively small.

[0053] In one embodiment, the irradiation dose of the electron beam is 1-50 kGy.

[0054] For example, the irradiation dose of electron beam irradiation can be 1 kGy, 5 kGy, 10 kGy, 20 kGy, 30 kGy, 40 kGy, or 50 kGy, etc.

[0055] The irradiation source for electron beam irradiation can be an electron accelerator, 60 Co and 137 Any of the following in Cs.

[0056] In one embodiment, the contaminant includes at least one of antibiotics, endocrine disruptors, and phenolic organic contaminants.

[0057] In this embodiment, singlet oxygen has high selectivity, which can remove new pollutants such as antibiotics, endocrine disruptors and phenolic organic pollutants from the wastewater to be treated, thereby avoiding the problem that new pollutants are difficult to remove due to reaction competition between other pollutants and new pollutants.

[0058] The water treatment method for generating singlet oxygen based on electron beam irradiation provided in this invention generates singlet oxygen by synergistic activation of oxygen with reducing metal ions and electron beam irradiation. The reducing metal ions can be recycled, resulting in a low dosage, while electron beam irradiation can be applied to the treatment of turbid or highly chromatic wastewater. This makes the generation of singlet oxygen universal and eliminates the need for post-treatment steps to remove byproducts. It has high universality for the removal of new pollutants and exhibits good treatment effects.

[0059] To enable those skilled in the art to better understand the present invention, the following describes the water treatment method based on electron beam irradiation to generate singlet oxygen through several specific embodiments.

[0060] Example 1

[0061] Add 5 mmol of CeCl3 and 10 g / L of NaCl to 100 mL of wastewater containing 5 mg / L sulfamethoxazole, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0062] Wastewater was irradiated with an electron beam at a dose of 20 kGy.

[0063] During the irradiation process, diphenylbenzofuran was used to capture singlet oxygen, and the change in adsorption light was detected at a wavelength of 415 nm. The content of sulfamethoxazole after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G(1O2) = 0.37 / 100 eV, and sulfamethoxazole in the wastewater was completely removed.

[0064] Comparative Example 1

[0065] Add 10 g / L NaCl to 100 mL of wastewater containing 5 mg / L sulfamethoxazole, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0066] Wastewater was irradiated with an electron beam at a dose of 20 kGy.

[0067] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.09 / 100eV.

[0068] Comparing Example 1 and Comparative Example 1, the addition of CeCl3 for the generation of singlet oxygen can increase the yield of singlet oxygen by four times.

[0069] Example 2

[0070] Add 5 mmol of MnCl2 and 10 g / L of NaCl to 100 mL of wastewater containing 5 mg / L carbamazepine, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0071] Wastewater was irradiated with an electron beam at a dose of 10 kGy.

[0072] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The content of carbamazepine after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.44 / 100eV, carbamazepine in the wastewater was completely removed.

[0073] Comparative Example 2

[0074] Add 10 g / L NaCl to 100 mL of wastewater containing 5 mg / L carbamazepine, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0075] Wastewater was irradiated with an electron beam at a dose of 10 kGy.

[0076] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.09 / 100eV.

[0077] Comparing Example 2 and Comparative Example 2, the addition of MnCl2 to generate singlet oxygen can increase the yield of singlet oxygen by five times.

[0078] Example 3

[0079] Add 2 mmol of MnCl2, 20 mmol of n-butanol, and 5 g / L of Na2SO4 to 100 mL of wastewater containing 5 mg / L phenol. Continuously purge the solution with air until the wastewater is saturated with oxygen.

[0080] Wastewater was irradiated with an electron beam at a dose of 10 kGy.

[0081] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The content of phenol after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.62 / 100eV, phenol in wastewater is completely removed.

[0082] Comparing Examples 1, 2, and 3, it can be seen that adding n-butanol as a free radical quencher is beneficial to increasing the yield of singlet oxygen.

[0083] Example 4

[0084] Add 5 mmol of CeCl3 and 10 g / L of NaCl to 100 mL of wastewater containing 5 mg / L sulfamethoxazole, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0085] Wastewater was irradiated with an electron beam at a dose of 30 kGy.

[0086] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The content of sulfamethoxazole after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.77 / 100eV, sulfamethoxazole in the wastewater was completely removed.

[0087] Example 5

[0088] Add 5 mmol of FeCl2 and 10 g / L of NaCl to 100 mL of wastewater containing 5 mg / L sulfamethoxazole, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0089] Wastewater was irradiated with an electron beam at a dose of 40 kGy.

[0090] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The content of sulfamethoxazole after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G( 1 O2) = 0.89 / 100eV, sulfamethoxazole in the wastewater was completely removed.

[0091] Example 6

[0092] Add 5 mmol of CoCl2 and 10 g / L of NaCl to 100 mL of wastewater containing 5 mg / L sulfamethoxazole, and continuously purge air into the solution until the wastewater is saturated with oxygen.

[0093] Wastewater was irradiated with an electron beam at a dose of 50 kGy.

[0094] During irradiation, singlet oxygen was captured using diphenylbenzofuran, and the change in adsorption light was detected at a wavelength of 415 nm. The content of sulfamethoxazole after electron beam irradiation was also monitored. The results showed that the yield of singlet oxygen was G( 1 O2) = 1.07 / 100eV, sulfamethoxazole in the wastewater was completely removed.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0096] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and components involved are not necessarily essential to the present invention.

[0097] The above provides a detailed description of the water treatment method based on electron beam irradiation to generate singlet oxygen provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A water treatment method based on electron beam irradiation to generate singlet oxygen, characterized in that, The method includes: A metal salt is added to the wastewater to be treated and stirred until a mixed solution is obtained; wherein the metal salt includes reducing metal ions; Air is continuously introduced into the mixed solution to enrich it with oxygen; The oxygen-rich mixed solution is irradiated with an electron beam so that the reducing metal ions, in conjunction with the electron beam irradiation, activate the oxygen in the mixed solution to generate singlet oxygen, thereby removing new pollutants from the wastewater to be treated.

2. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, Prior to irradiating the oxygen-rich mixed solution with an electron beam, the method further includes: A free radical quencher is added to the wastewater to remove excess hydroxyl radicals during the electron beam irradiation process; The free radical quencher includes any one of methanol, ethanol, tert-butanol, and n-butanol.

3. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 2, characterized in that, The dosage of the free radical quencher is 10-100 mmol / L.

4. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The metal salt includes at least one of CeCl3, MnCl2, CoCl2, FeCl2, and RuCl2.

5. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The dosage of the metal salt is 1-10 mmol / L.

6. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The ratio between the electron beam irradiation dose and the amount of metal salt added is 1 kGy: 0.1-0.5 mmol.

7. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 6, characterized in that, The ratio between the electron beam irradiation dose and the amount of metal salt added is 1 kGy: 0.27 mmol.

8. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The electron beam irradiation dose is 1-50 kGy.

9. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The irradiation source for the electron beam irradiation is an electron accelerator.

10. The water treatment method based on electron beam irradiation to generate singlet oxygen according to claim 1, characterized in that, The pollutants include at least one of antibiotics, endocrine disruptors, and phenolic organic pollutants.

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