Method for degrading organic pollutants in water body by efficiently activating peroxydisulfate

Abstract

The invention belongs to the technical field of sewage treatment, and relates to a method for degrading organic pollutants in a water body by efficiently activating peroxydisulfate. The method comprises the following steps: S1, adjusting the pH value of a to-be-treated water body containing target pollutants to 7-8; and S2, adding peroxydisulfate into the reaction water body, uniformly stirring, reacting at the ultraviolet wavelength of 220-230nm, and efficiently activating the peroxydisulfate by using ultraviolet light radiated by a krypton chloride excimer lamp to generate high-concentration hydroxyl free radicals (HO.) and sulfate free radicals # imgabs0 # with strong oxidizing property so as to realize efficient degradation of organic pollutants. Compared with the prior art, the method has the advantages that organic pollutants in sewage can be efficiently degraded, the stability is good, the dosage of the required oxidizing agent peroxydisulfate is small, the energy consumption is low, and the method has good degradation performance and economic advantages.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for efficiently activating peroxydisulfate to degrade organic pollutants in water. Background Art

[0002] UV-AOPs is a technology that uses the synergistic effect of ultraviolet light and oxidants (such as ozone, hydrogen peroxide, etc.) to produce highly oxidizing hydroxyl radicals (HO·) to degrade organic matter. UV-AOPs has advantages in treating difficult-to-degrade organic pollutants and is also widely used in drinking water treatment. In recent years, with the in-depth research on advanced oxidation processes, The advanced oxidation process has attracted wide attention in the scientific and industrial communities and has been shown to be effective in the degradation of refractory organic pollutants. 2- , PDS) is an oxidant widely used in repair, which can be combined with ultraviolet light to produce sulfate radicals and some hydroxyl radicals (HO.). (Redox potential 2.5-3.1 V) is a strong oxidant that selectively reacts with 6 ~10 9 M -1 s -1 At the same time, HO· (redox potential 1.9-2.7 V) is a non-selective oxidant, and the reaction rate constant of most organic pollutants is higher than 10 9 M -1 s -1 .also, The life span is 3×10 -8 ~4×10 -8 s, which is longer than the lifetime of HO·(2×10 -8 s) is high, so It can fully contact with the target pollutants, prolong the reaction time and improve the degradation effect.

[0003] The key to UV-AOPs treatment of wastewater containing organic pollutants lies in high efficiency, energy saving and pollution-free treatment. The radiation efficiency of the 254nm traditional mercury lamp is relatively high, reaching more than 40%, but mercury will seriously pollute the environment, and the radiation wavelength of the mercury lamp can only be fixed.

[0004] Patent CN111977740B provides a method for removing antibiotics from water by activating peroxydisulfate without catalyst under visible light, wherein peroxydisulfate is added to water containing antibiotics, and PS is activated under visible light to produce free radicals to remove antibiotics; the antibiotics are sulfonamide antibiotics; PS is a mixture of one or more of potassium peroxydisulfate, sodium peroxydisulfate, and ammonium peroxydisulfate; the antibiotic is at least one of sulfonamide, sulfamethoxazole, sulfamethoxazole, or sulfadimethoxine. However, this patent has certain deficiencies in using visible light to activate peroxydisulfate. When studying the degradation of antibiotics by peroxydisulfate of different concentrations activated by visible light, the visible light irradiation time is relatively long, reaching 60 minutes, and for some antibiotics, such as sulfamethoxazole, when the peroxydisulfate concentration is as high as 5mM, the removal rate after 60 minutes of visible light irradiation still cannot reach 100%. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art and to provide a method for efficiently activating peroxydisulfate to degrade organic pollutants in water, which has good activation effect and high degradation rate.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a method for efficiently activating peroxydisulfate to degrade organic pollutants in water, which uses an excimer lamp to radiate 222nm ultraviolet rays to activate peroxydisulfate to generate high concentrations of HO· and generate The HO process is as follows:

[0008]

[0009] Through high concentrations of strong oxidative free radicals HO· and To achieve the oxidative degradation of organic matter, the following steps are included:

[0010] S1, adjusting the pH of the water body to be treated containing the target pollutant to 7-8; preferably, adding a buffer solution to the reaction system to maintain the pH of the solution to be treated at 7.4-7.6 during the reaction; preferably, the added buffer solution is a phosphate buffer solution with a concentration of 5mM;

[0011] S2, adding peroxydisulfate to the reaction water, stirring evenly and reacting at an ultraviolet wavelength of 220-230 nm.

[0012] Furthermore, in step S1, the target pollutant is selected from at least one of dibutyl phthalate, carbamazepine, diclofenac sodium, triclosan or bisphenol A. The target pollutant is preferably dibutyl phthalate.

[0013] Furthermore, in step S1, the molar concentration of the target pollutant in the water to be treated is 1-10 μM.

[0014] Further, in step S2, the peroxodisulfate is at least one of potassium peroxodisulfate, sodium peroxodisulfate or ammonium peroxodisulfate. The peroxodisulfate is preferably sodium peroxodisulfate.

[0015] Furthermore, in step S2, the molar concentration of the peroxodisulfate is 0.1-1 mM. The molar concentration of the peroxodisulfate is preferably 1 mM.

[0016] Further, in step S2, an excimer lamp device is used to radiate ultraviolet light to activate the peroxydisulfate at 40-60 mJ / cm 2 High concentration at a light flux of and HO·, degrading organic pollutants in wastewater.

[0017] Furthermore, the luminous flux is the product of the ultraviolet light intensity of the excimer lamp and time.

[0018] Furthermore, the excimer lamp device is a KrCl excimer lamp device. The degradation reaction is carried out in the KrCl excimer lamp device, and the outer layer of the KrCl excimer lamp device has a light-proof black box. In the KrCl excimer lamp device, the water body to be treated is placed in a covered quartz culture dish (2), and the external power supply (10) is connected to the switch (9), the indicator light (11), the transformer (12), the circuit board (7) and the KrCl excimer lamp (3) in sequence, and the excimer lamp is cooled by the internal fan (5).

[0019] Furthermore, in step S2, the ultraviolet wavelength is 221-223 nm, and more preferably 222 nm.

[0020] Furthermore, in step S2, the reaction time is 10-20 min.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a method for efficiently activating peroxydisulfate to degrade organic pollutants in water. The wastewater to be treated and peroxydisulfate are mixed and added into a reaction container, and then placed in an excimer lamp device to radiate ultraviolet light. The KrCl excimer lamp is used to radiate 222nm ultraviolet light to activate the peroxydisulfate to produce HO· and Using HO and The strong oxidizing property degrades organic pollutants in wastewater. In the KrCl excimer lamp, krypton (Kr) and chlorine (Cl2) are excited by dielectric barrier discharge to produce KrCl excimers. The KrCl excimer lamp adopts a coaxial structure, and a dielectric barrier discharge is formed between the inner tube and the outer tube. This discharge form has a simple structure, is economical and practical, and can efficiently excite 222nm excimers to emit light. The 222nm wavelength KrCl excimer lamp has minimal adverse effects on the skin and eyes and cannot penetrate human skin and cornea, so it can be used in human environments, achieving human-machine friendly coexistence. The ultraviolet light radiated by the KrCl excimer lamp can break the OO bond in the peroxydisulfate molecule, producing high concentrations of HO· and Oxidize the target pollutants; in addition, the ultraviolet light radiated by the KrCl excimer lamp can directly photolyze some pollutants; under the synergistic effect of the two methods, the organic pollutants in the wastewater can be efficiently degraded.

[0023] (2) The working principle of KrCl excimer lamp is based on dielectric barrier discharge, through which KrCl* excimers are generated, thereby emitting far-ultraviolet light of 222nm. The spectral characteristics of this light source enable it to effectively destroy the DNA and RNA of microorganisms, thereby achieving the effect of disinfection and inactivation of pathogens. In addition, KrCl excimer lamps also perform well in the photolysis of organic micropollutants. Its photolysis rate constant and quantum yield are usually much higher than those of 254nm, and this makes it have the potential to improve the performance of advanced oxidation in water treatment. Therefore, using excimer light sources to radiate ultraviolet light to activate persulfate and degrade organic matter in water is a promising sewage treatment technology. Compared with traditional light sources, excimer light sources have a wide range of radiation wavelengths to choose from, the rare gases or halogen molecules used have little impact on the environment, there is no radiation self-absorption, the radiation area is large, and the service life is long.

[0024] (3) The present invention provides a method for efficiently activating persulfate to degrade organic pollutants in water. Compared with the traditional 254nm ultraviolet light source to activate persulfate, the activation effect is better, the steady-state concentration of free radicals generated is higher, and the organic pollutants can be degraded more effectively.

[0025] (4) The present invention provides a method for efficiently activating peroxydisulfate to degrade organic pollutants in water bodies. The reaction conditions are mild and the operation is simple. No additional activating agent needs to be added during the degradation process, thereby avoiding secondary pollution. The present invention is a new pollutant treatment technology that is green, safe, and environmentally friendly. The high energy characteristics of far-ultraviolet light are fully utilized to significantly improve water treatment efficiency.

[0026] (5) Compared with patent CN111977740B, the present invention uses KrCl excimer lamp to radiate 222nm ultraviolet light to activate peroxydisulfate, which has good activation effect and high steady-state concentration of free radicals, and can achieve rapid degradation of organic pollutants in a short time. For example, when 1mM peroxydisulfate is activated by 222nm ultraviolet light irradiation of KrCl excimer lamp to degrade 2μM dibutyl phthalate, 100% degradation of dibutyl phthalate is achieved within 12 minutes, indicating that the present invention is highly efficient in removing organic pollutants and uses a small amount of peroxydisulfate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the KrCl excimer lamp device of the present invention;

[0028] Figure 2 The degradation performance test results of dibutyl phthalate in Example 1 of the present invention and Comparative Examples 1-2 are shown;

[0029] Figure 3 is the steady-state concentration of free radicals generated by the activation of sodium peroxydisulfate in Example 1 of the present invention and Comparative Example 3;

[0030] Figure 4 It is the molar absorption coefficient of sodium persulfate in Example 1 of the present invention and Comparative Example 3 under the excimer lamp 222nm and the traditional 254nm ultraviolet light source.

[0031] Description of the markings in the figure:

[0032] 1- sample drawer, 2- covered quartz culture dish, 3- KrCl excimer lamp, 4- sample drawer, 5- internal fan, 6- hinge, 7- circuit board, 8- side door handle, 9- switch, 10- external power supply, 11- indicator light, 12- transformer. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] The present invention provides a method for efficiently activating peroxydisulfate to degrade organic pollutants in water, which uses an excimer lamp to radiate 222nm ultraviolet rays to activate peroxydisulfate to generate high concentrations of HO· and generate The HO process is as follows:

[0035]

[0036] Through high concentrations of strong oxidative free radicals HO· and To achieve the oxidative degradation of organic matter, the following steps are included:

[0037] S1, adjusting the pH of the water body to be treated containing the target pollutant to 7-8; preferably, adding a buffer solution to the reaction system to maintain the pH of the solution to be treated at 7.4-7.6 during the reaction; preferably, the added buffer solution is a phosphate buffer solution with a concentration of 5mM; the target pollutant is selected from at least one of dibutyl phthalate, carbamazepine, diclofenac sodium, triclosan or bisphenol A, preferably dibutyl phthalate; the molar concentration of the target pollutant in the water body to be treated is 1-10μM, preferably 2μM;

[0038] S2, add peroxydisulfate to the reaction water, stir evenly and react at an ultraviolet wavelength of 220-230nm, preferably 221-223nm, more preferably 222nm, and react for 10-20min; the peroxydisulfate is at least one of potassium peroxydisulfate, sodium peroxydisulfate or ammonium peroxydisulfate, preferably sodium peroxydisulfate; the molar concentration of the peroxydisulfate is 0.1-1mM, preferably 1mM; use an excimer lamp device to radiate ultraviolet light to activate the peroxydisulfate, at 40-60mJ / cm 2 High concentration at a light flux of and HO·, degrading organic pollutants in wastewater, wherein the luminous flux is the product of the ultraviolet light intensity of the excimer lamp and the time; Figure 1 As shown, the excimer lamp device is a KrCl excimer lamp device, the degradation reaction is carried out in the KrCl excimer lamp device, and the outer layer of the KrCl excimer lamp device has a light-proof black box; in the KrCl excimer lamp device, the water body to be treated is placed in a covered quartz culture dish 2, and the quartz cover is added to prevent liquid volatilization and increase ultraviolet transmittance, the external power supply 10 is connected to the switch 9, the indicator light 11, the transformer 12, the circuit board 7 and the KrCl excimer lamp 3 in sequence, and the excimer lamp is cooled by the internal fan 5.

[0039] Unless otherwise specified, the reagents, methods, instruments and equipment used in the present invention are conventional reagents, methods, instruments and equipment in the art. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0040] Example 1

[0041] This embodiment provides a method for efficiently activating peroxydisulfate to degrade organic pollutants in water, comprising the following steps:

[0042] (1) Prepare 10 mL of 2 μM dibutyl phthalate solution at room temperature, add 5 mM phosphate buffer solution to the aqueous solution containing dibutyl phthalate to adjust the pH to 7.5. Place the solution to be treated with the adjusted pH in a covered quartz culture dish 2 and place it in a KrCl excimer lamp device.

[0043] (2) Sodium persulfate with a final concentration of 1 mM was added to the reaction water, stirred evenly, and then the KrCl excimer lamp device was turned on. The ultraviolet wavelength was 222 nm. The reaction was stopped after 12 minutes. The light flux was 50 mJ / cm 2 .

[0044] Comparative Example 1

[0045] The difference between this comparative example and Example 1 is that the peroxydisulfate system is used alone, and the KrCl excimer lamp device is not turned on.

[0046] This comparative example provides a method for degrading organic pollutants in water using peroxodisulfate, comprising the following steps:

[0047] (1) Prepare 10 mL of 2 μM dibutyl phthalate solution at room temperature, add 5 mM phosphate buffer solution to the aqueous solution containing dibutyl phthalate to adjust the pH to 7.5. Place the solution to be treated with the adjusted pH in a covered quartz culture dish 2 and place it in a KrCl excimer lamp device.

[0048] (2) Sodium persulfate at a final concentration of 1 mM was added to the reaction water, and the mixture was stirred evenly without turning on the KrCl excimer lamp device. The reaction was stopped after 12 minutes.

[0049] Comparative Example 2

[0050] The difference between this comparative example and Example 1 is that a KrCl excimer lamp device is used alone for direct photolysis without adding peroxydisulfate.

[0051] This comparative example provides a method for ultraviolet degradation of organic pollutants in water, comprising the following steps:

[0052] (1) Prepare 10 mL of 2 μM dibutyl phthalate solution at room temperature, add 5 mM phosphate buffer solution to the aqueous solution containing dibutyl phthalate to adjust the pH to 7.5. Place the solution to be treated with the adjusted pH in a covered quartz culture dish 2 and place it in a KrCl excimer lamp device.

[0053] (2) Turn on the KrCl excimer lamp device, the ultraviolet wavelength is 222nm, the reaction is stopped after 12 minutes, and the luminous flux is 50mJ / cm 2 .

[0054] Comparative Example 3

[0055] The difference between this comparative example and Example 1 is that a UV-LED device is used to irradiate conventional 254 nm ultraviolet light to activate peroxydisulfate to degrade pollutants.

[0056] This comparative example provides a method for degrading organic pollutants in water by activating peroxydisulfate with a conventional 254 nm ultraviolet light, comprising the following steps:

[0057] (1) Prepare 10 mL of 2 μM dibutyl phthalate solution at room temperature, add 5 mM phosphate buffer solution to the aqueous solution containing dibutyl phthalate to adjust the pH to 7.5. Place the solution to be treated with the adjusted pH in a covered quartz culture dish 2 and place it in a UV-LED irradiation device.

[0058] (2) Sodium persulfate with a final concentration of 1 mM was added to the reaction water, stirred evenly, and then the UV-LED irradiation device was turned on. The ultraviolet wavelength was 254 nm. The reaction was stopped after 12 minutes. The light flux was 203.8 mJ / cm 2 .

[0059] The following photodegradation performance tests were performed on Example 1 and Comparative Examples 1-2.

[0060] Detection instrument: High performance liquid chromatography.

[0061] Test method: Before the degradation experiment begins, prepare the substrate stock solution used in the experiment as needed, including the substrate dibutyl phthalate solution of the corresponding experiment. Before the experiment, dilute the mother liquor to the target concentration, and add phosphate buffer solution to adjust the pH value to the required value. At the beginning of the experiment, 10mL of the reaction solution is placed in a culture dish. In Example 1 and Comparative Example 1-2, sodium persulfate with a final concentration of 1mM is added according to the experimental requirements. For experiments requiring ultraviolet light catalysis, the KrCl excimer lamp device or UV-LED device is synchronously turned on for ultraviolet irradiation at this time, and the reaction starts timing. At 0min, 0.75min, 1.5min, 3min, 6min, and 12min, 100μL of water samples are taken out and injected into a liquid phase vial with an inner liner tube, and a quencher (Na2S2O3) is added to quench the remaining oxidant, shake well and wait for high performance liquid chromatography detection. The mobile phase was water (20%): methanol (80%), the column temperature was 30°C, the UV detection wavelength was 222 nm, the flow rate was 1 mL / min, and the injection volume was 50 μL. C / C0 was used as the ordinate and time (min) was used as the abscissa, where C0 and C respectively represented the initial concentration and reaction concentration of dibutyl phthalate.

[0062] Figure 2The degradation performance test results of dibutyl phthalate in Example 1 of the present invention and Comparative Examples 1-2 are shown. Figure 2 As shown in the figure, the degradation effect of dibutyl phthalate by direct photolysis of sodium peroxydisulfate and KrCl excimer lamp is poor, while the degradation effect of dibutyl phthalate by activating sodium peroxydisulfate with ultraviolet radiation of excimer lamp established in the present invention is better. The degradation rate of dibutyl phthalate by oxidation with sodium peroxydisulfate (PDS) alone (Comparative Example 1) is 3.4%, and the degradation rate of dibutyl phthalate by KrCl excimer lamp (UV 222 ) Direct photolysis (Comparative Example 2) degradation rate of dibutyl phthalate was 16.5%, and ultraviolet radiation from excimer lamp activated sodium persulfate (UV 222 The degradation rate of dibutyl phthalate by PDS was 100%.

[0063] The following free radical steady-state concentration test was performed on Example 1 and Comparative Example 3 to compare the steady-state concentrations of free radicals generated when sodium persulfate was activated by radiation with different ultraviolet light sources under the same reaction system.

[0064] Detection instrument: High performance liquid chromatography.

[0065] Test method: Nitrobenzene (NB) and benzoic acid (BA) were used as ·OH and The steady-state concentration of free radicals was calculated by detecting the degradation of the probe. Specifically, the steady-state concentration of free radicals was determined based on the competitive kinetics of the degradation of the probe compound. 2 mM nitrobenzene and benzoic acid were used as probes to measure [OH·] ss and Among them, the degradation of nitrobenzene and benzoic acid can be expressed as:

[0066] k obs，NB =k 222-NB +k oH·-NB [OH·] ss ;

[0067]

[0068] In the above two formulas, k obs , NB , k obs , BA For probe compounds under UV 222 / The pseudo-first-order rate constant of degradation in PDS, which was determined experimentally; k 222-NB , k 222-BA For probe compounds under UV 222 The rate constant for direct photolysis under conditions of , which was determined experimentally; k OH.-NB , k OH.-BA , is the secondary rate constant of the probe compound to the free radical, which is obtained from the data, where k OH.-NB =3.9*10 9 M -1 s -1 , k OH·-BA =5.9*10 9 M -1 s -1 , According to the above calculation, [OH·] ss and

[0069] The specific detection methods for nitrobenzene and benzoic acid are as follows: the liquid chromatography detection method for nitrobenzene is: 0.1% phosphoric acid aqueous solution (35%): methanol (65%), the column temperature is 35°C, the ultraviolet detection wavelength is 227nm, the flow rate is 1mL / min, and the injection volume is 20μL; the liquid phase detection method for benzoic acid is water (50%): methanol (50%), the column temperature is 30°C, the ultraviolet detection wavelength is 227nm, and the flow rate is 1mL / min.

[0070] Figure 3 is the steady-state concentration of free radicals generated by the activation of sodium persulfate in Example 1 of the present invention and Comparative Example 3. Figure 3 As shown in Figure 2, compared with the traditional 254nm UV light source, the excimer lamp has a more significant effect in activating peroxydisulfate, whether it is HO. The steady-state concentration of free radicals generated under the excimer lamp light source is higher than that of the 254nm ultraviolet light source. The degradation effect of organic matter is related to the steady-state concentration of free radicals. The higher the steady-state concentration of free radicals, the better the degradation effect. 222 ) The effect of activating peroxydisulfate is more efficient.

[0071] The present invention further measures the ultraviolet absorption spectrum of the used peroxydisulfate, and compares the molar absorption coefficient of the peroxydisulfate under the 222nm excimer lamp and the traditional 254nm ultraviolet light source.

[0072] Testing instrument: UV spectrophotometer.

[0073] Test method: Measure the absorbance of the peroxydisulfate solution under 200nm-350nm ultraviolet light at the reaction system concentration. According to the Lambert-Beer law, the absorbance (A) is proportional to the concentration (c) and the optical path length (l) of the solution, that is, A = εlc, where ε represents the molar absorption coefficient. Then calculate the molar absorption coefficient according to the peroxydisulfate concentration and draw the molar absorption coefficient curve.

[0074] Figure 4is the molar absorption coefficient of sodium persulfate in Example 1 and Comparative Example 3 of the present invention under the excimer lamp 222nm and the traditional 254nm ultraviolet light source. The absorption spectrum of sodium persulfate under ultraviolet wavelength is as follows Figure 4 As shown in the figure, it can be seen that the molar absorption coefficient of sodium persulfate at the 222nm ultraviolet wavelength of the excimer lamp is 174.7L mol -1 cm -1 , much larger than the 19.8L mol at the traditional 254nm wavelength -1 cm -1 , that is, the molar absorption coefficient of sodium peroxydisulfate under an excimer lamp is 8.8 times that under a wavelength of 254 nm, so the present invention is more efficient in activating peroxydisulfate.

[0075] The above results show that the present invention uses KrCl excimer lamp to radiate 222nm ultraviolet light to activate peroxydisulfate to produce HO. and Using HO. and The strong oxidizing property of the invention can degrade organic pollutants in wastewater, and is a wastewater treatment technology with development prospects. Compared with traditional light sources, the activation effect is better, the steady-state concentration of free radicals generated is higher, and the organic pollutants can be degraded more effectively. The degradation rate of dibutyl phthalate provided by the invention can reach 100%.

[0076] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for efficiently activating peroxydisulfate to degrade organic pollutants in water, characterized in that: The steps include: S1, adjusting the pH of the water body to be treated containing the target pollutant to 7-8; S2, adding peroxydisulfate to the reaction water, stirring evenly and reacting at an ultraviolet wavelength of 220-230 nm.

2. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S1, the target pollutant is selected from at least one of dibutyl phthalate, carbamazepine, diclofenac sodium, triclosan or bisphenol A.

3. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S1, the molar concentration of the target pollutant in the water to be treated is 1-10 μM.

4. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S2, the peroxodisulfate is at least one of potassium peroxodisulfate, sodium peroxodisulfate or ammonium peroxodisulfate.

5. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S2, the molar concentration of the peroxodisulfate is 0.1-1 mM.

6. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S2, an excimer lamp device is used to radiate ultraviolet light to activate the peroxydisulfate at 40-60 mJ / cm 2 High concentration at a light flux of and HO . , degrading organic pollutants in wastewater.

7. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 6, characterized in that: The luminous flux is the product of the ultraviolet light intensity of the excimer lamp and time.

8. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 6, characterized in that: The excimer lamp device is a KrCl excimer lamp device.

9. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S2, the ultraviolet wavelength is 221-223 nm.

10. The method for efficiently activating peroxydisulfate to degrade organic pollutants in water according to claim 1, characterized in that: In step S2, the reaction time is 10-20 min.

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