CN113135594A

CN113135594A - Persulfate activation method and application thereof

Info

Publication number: CN113135594A
Application number: CN202010059973.8A
Authority: CN
Inventors: 敖志敏; 刘淑慧; 聂纯阳; 安太成
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2021-07-20
Anticipated expiration: 2040-01-19
Also published as: CN113135594B

Abstract

The application belongs to the technical field of inorganic chemistry and water treatment, and particularly relates to a persulfate activation method and application thereof. The application provides a persulfate activation method, which comprises the following steps: mixing MoS₂Mixing the nanoflower, persulfate and first solvent for ultrasonic treatment, wherein the ultrasonic treatment time is 10-400min, and the mixture is subjected to MoS₂The nanoflower activates persulfate to generate free radicals. The activation method can be applied to treatment of environmental pollution and degradation of organic pollutants. The activation method provided by the application is a novel persulfate activation method, not only enriches the persulfate activation approaches, but also solves the problem of high energy consumption of the existing physical persulfate activation method,and the technical defect of environmental pollution of the chemical persulfate activation method.

Description

Persulfate activation method and application thereof

Technical Field

The application belongs to the technical field of inorganic chemistry and water treatment, and particularly relates to a persulfate activation method and application thereof.

Background

With the rapid development of industrialization and urbanization, in recent years, the amount of sewage discharged into the environment by human activities is increasing, and the sewage contains many organic pollutants which are difficult to degrade, so that the environmental water body is seriously polluted. Meanwhile, it poses a great threat to the ecological environment and human health, so that it is required to effectively remove the organic pollutants which are difficult to degrade in water.

Advanced oxidation technologies (AOPs) are considered as an efficient and rapid treatment technology, and are widely applied to the treatment of organic wastewater. Among them, the persulfate-based advanced oxidation method is currently attracting much attention. The traditional advanced oxidation technology is mainly based on hydrogen peroxide or ozone, and persulfate is used as a strong oxidant, so that the traditional advanced oxidation technology is more convenient to store and transport compared with oxidants such as hydrogen peroxide and the like; and the generated sulfate radical (2.5-3.1V) has higher oxidation-reduction potential and longer free radical life than hydroxyl radical (1.8-2.7V), and sulfate radical activated and decomposed by persulfate has one lone pair of electrons and oxidation-reduction potential E⁰2.6V, much higher than persulfate ion (E)⁰And 2.01V) close to hydroxyl free radicals, can rapidly degrade most organic pollutants theoretically, and therefore has potential application value in industry. Although persulfate has a high redox potential, it cannot directly react with contaminants by itself, and needs to be activated by various methods to generate radicals. The strong oxidizing property of the free radicals is utilized to attack the organic pollutants, so that the degradation efficiency of the organic pollutants can be effectively improved.

Conventional methods for activating persulfates can be largely classified into physical activation and chemical activation. These activation methods generally require the addition of energy or new chemicals to achieve the activation. The physical activation mainly comprises the following steps: thermal activation, electrical activation, ultraviolet radiation, etc., which are generally associated with high energy consumption and require a large input of external energy. And the chemical activation method comprises: transition metal oxide, alkali activation, phenol activation and the like, although the chemical activation efficiency is high, the transition metal oxide is easy to leak metal ions under an acidic environment to cause a secondary pollution problem, and the alkali activation itself is a strong alkaline condition, so that a new environmental burden is caused to a certain extent, and the treatment cost is increased.

In conclusion, the traditional method for activating persulfate has the technical defects of high energy consumption and secondary environmental pollution. Therefore, the development of a new method for activating persulfate with low energy consumption, high efficiency, cleanness and greenness is a technical problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In view of the above, the present application provides a persulfate activation method and an application thereof, which can effectively solve the technical defects of high energy consumption and environmental pollution of the existing persulfate activation method.

In a first aspect, the present application provides a method for activating persulfate, comprising the following steps:

mixing MoS₂Mixing the nanoflower, persulfate and the first solvent for ultrasonic treatment, wherein the ultrasonic time is 10-400min, and under the ultrasonic condition, MoS₂The nanoflower activates the persulfate so that it generates free radicals.

The first solvent may be water (distilled water, deionized water, etc.) or an organically-polluted solution (e.g., organically-polluted groundwater, organic wastewater, etc.).

More preferably, the time of the ultrasound is 90-180 min.

Preferably, the power of the ultrasound is 50-500W, the frequency of the ultrasound is 30-100 KHZ, and the temperature of the ultrasound is 10-50 ℃.

More preferably, the power of the ultrasound is 300-500W, the frequency of the ultrasound is 40KHZ, the temperature of the ultrasound is 10-30 ℃, most preferably, the temperature of the ultrasound is 25 ℃, and the ultrasound treatment is constant-temperature ultrasound treatment.

Preferably, the persulfate salt is selected from one or more of potassium persulfate, sodium persulfate, calcium persulfate, ammonium persulfate, potassium monopersulfate, sodium monopersulfate, calcium monopersulfate and ammonium monopersulfate.

Preferably, the concentration of the persulfate is 0.1-5 mmol/L; the MoS₂The concentration of the nanoflower is 0.1-2.0 g/L.

More preferably, the concentration of the persulfate is 1-4 mmol/L; the MoS₂The concentration of the nanoflower is 0.1-1.0 g/L, and most preferably, the MoS₂The concentration of the nanoflower is 0.2-0.4 g/L.

Preferably, the MoS₂The structure of the nanometer flower is a petal-shaped structure, and the petal edge of the petal-shaped structure is provided with 0-10 layers of MoS₂And (5) structure.

More preferably, the MoS of the petal-shaped structure is at the edge of the petal₂The number of structural layers is 1-10 odd layers.

In particular to the MoS of the petal-shaped structure at the petal edge₂The structure is similar to a corrugated structure, the MoS of the petal-shaped edge of the petal-shaped structure₂The number of layers of the structure is 1, 3 or 5.

Preferably, the MoS₂The preparation method of the nanoflower comprises the following steps:

step 1, mixing molybdate, thiourea and a second solvent, and then adjusting the pH value to obtain an acidic mixed solution;

step 2, carrying out hydrothermal reaction on the mixed solution, and then drying to obtain MoS₂And (4) nano flowers.

Specifically, in the step 1, the pH value of the acidity is 1-5.

Specifically, the second solvent is selected from one or more of deionized water, distilled water and ultrapure water.

Specifically, after the hydrothermal reaction in step 2, the method further comprises the following steps before drying: to MoS₂The nanoflower is washed with ultrapure water and ethanol.

Preferably, in step 1, the molybdate is selected from one or more of sodium molybdate and ammonium molybdate.

Preferably, in step 1, the mass ratio of the molybdate to the thiourea is 1: (1-5).

Preferably, in the step 2, the temperature of the hydrothermal reaction is 150-230 ℃, and the time of the hydrothermal reaction is 20-25 h.

More preferably, in the step 2, the temperature of the hydrothermal reaction is 150-200 ℃, and the time of the hydrothermal reaction is 22-24 hours.

Specifically, in step 2, the drying is vacuum freeze drying.

In a second aspect, the application provides the use of the activation method in the remediation of environmental pollution.

Specifically, the pollution source of the environmental pollution can be organically polluted soil and underground water, and organic wastewater; wherein, the organic wastewater can be domestic organic wastewater or/and industrial organic wastewater.

In a third aspect of the application there is provided the use of the activation process for degrading organic contaminants.

Specifically, the application comprises the following steps: mixing MoS₂Mixing the nanoflower and the solution containing the organic pollutants, and carrying out ultrasonic treatment for 10-400min to obtain the solution after the organic pollutants are degraded.

Preferably, the organic contaminant is one or more of phenol, bisphenol a and rhodamine B.

The present application discloses the use of MoS₂The nanoflower is used for carrying out ultrasonic treatment on persulfate in a solvent, so that the persulfate can be efficiently activated to generate sulfate radicals and hydroxyl radicals. As a typical two-dimensional (2D) material, the MoS synthesized in this patent₂The nanoflower has a petal-shaped special structure, has higher curvature compared with a plane structure, and is beneficial to exposing more petal edges. With abundant monolayer and few-layer MoS at the edge of each petal₂Structure, MoS found in the application₂The nanoflowers deform under the mechanical disturbance of ultrasound, and the petal structure has single-layer and few-layer MoS at the edge₂Under the action of deformation, polarization easily occurs, a built-in electric field is formed, so that current carriers are separated, persulfate is further activated, and free radicals are generated. The application activates persulfate through a high-efficiency and low-pollution method to generate a large amount of sulfate radicals and hydroxyl radicals, and then the persulfate is obtained through the methodThe obtained sulfate radical and hydroxyl radical can realize various purposes, such as degradation of organic pollutants, treatment of environmental pollution and the like. Therefore, the activation method provided by the application is a novel persulfate activation method, not only is the activation way of persulfate enriched, but also the technical defects of high energy consumption in the existing physical persulfate activation method and environmental pollution in the existing chemical persulfate activation method can be overcome.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 shows the effect of persulfate activation on phenol degradation in various systems according to example 1 of the present application;

FIG. 2 shows MoS prepared in example 2 of the present application₂SEM pictures of nanoflower;

FIG. 3 shows MoS under different stirring conditions at different rotation speeds as provided in comparative example 2₂The nanoflower activates persulfate to degrade the degradation efficiency of phenol.

FIG. 4 shows MoS provided in example 1 and provided in comparative example 3₂Nanoflower and commercial MoS₂The degradation effect of activating persulfate to degrade phenol in the same system is compared.

Detailed Description

The application provides a persulfate activation method and application thereof, which are used for solving the technical defects of high energy consumption and environmental pollution of the existing persulfate activation method.

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The raw materials and reagents used in the following examples are commercially available or self-made.

Example 1

The application provides an application example of the activation of the first persulfate, which comprises the following specific steps:

1、MoS₂preparing the nanoflower: sodium molybdate and thiourea are dissolved in ultrapure water, and hydrochloric acid is dropwise added under the stirring condition to enable the pH value to be about 1. The resulting mixed solution was magnetically stirred for 30min and then transferred to a teflon reaction kettle. Reacting for 24 hours at 180 ℃ by a Teflon reaction kettle to generate black MoS₂Filtering the nanometer flower solution, washing with ultrapure water and ethanol for 3 times, and vacuum freeze drying the obtained material to obtain MoS₂Nanoflower (marked as MoS)₂NFs)。

2. Four different systems are designed to measure the removal effect of the degraded phenol, and the four different systems are respectively:

a. adding potassium monopersulfate into organic pollutant wastewater containing phenol and performing ultrasonic treatment (marked as ultrasonic/PMS in figure 1);

b. MoS of this example was added to phenol-containing organic pollutant wastewater₂The nanoflower was sonicated (labeled ultrasound/MoS in FIG. 1)₂NFs)；

c. Potassium monopersulfate and MoS of this example were added to phenol-containing organic pollutant wastewater₂The nanoflower is stirred (marked as stirring/PMS/MoS in figure 1)₂NFs)；

d. Potassium monopersulfate and MoS of this example were added to phenol-containing organic pollutant wastewater₂The nanoflower is subjected to ultrasonic treatment (marked as ultrasonic/PMS/MoS in figure 1)₂NFs)。

The experimental conditions are as follows: adding phenol into deionized water to obtain organic pollutant wastewater to be treated with the initial concentration of phenol of 10mg/L, wherein MoS in b, c and d₂The dosage of the nanoflower is 0.3g/L, the concentration of potassium monopersulfate in a, c and d is 3.25mmol/L, ultrasonic treatment is carried out at constant temperature of 25 ℃ for 180min, 0.8mL of solution is taken out and filtered through a 0.22 mu m filter membrane when the solution is subjected to constant temperature ultrasonic treatment for 0min, 10min, 30min, 60min, 90min, 120min, 150min and 180min, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, and the solution is stored in a container1.5mL of a brown liquid phase vial was used for the determination of phenol concentration. And after the reaction is finished, collecting the waste liquid into a waste liquid barrel, and uniformly treating.

The phenol concentration of the four different systems is detected under a certain reaction time, and the result is shown in fig. 1, and fig. 1 is the removal effect (organic pollutant concentration-time curve) of the persulfate activation method provided in example 1 of the present application on phenol degradation in different systems. As can be seen from FIG. 1, MoS₂The adsorption capacity of the nanoflower to phenol is weak; the pure system only containing potassium monopersulfate hardly degrades phenol; only MoS₂The degradation efficiency of phenol is about 10% in a system with nanoflower; the d group has the strongest removing capability to phenol, and 94 percent of phenol can be removed within 180 min; and potassium monopersulfate and MoS under non-ultrasonic conditions of group c₂The degradation efficiency of the nanoflower system is only about 15%, which indicates that the ultrasonic wave is in MoS₂The nanometer flower and the potassium monopersulfate play an important synergistic role in the system.

As can be seen from the comprehensive comparison, under the ultrasonic condition, MoS is used₂The nanoflower generates deformation under the ultrasonic disturbance, so that potassium monopersulfate is activated, the efficiency of activating potassium monopersulfate can be obviously improved, free radicals are generated, and the removal capacity of phenol is promoted.

Example 2

The present application provides a MoS₂The preparation method and the analysis of the nanoflower comprise the following specific steps:

1、MoS₂preparing the nanoflower: sodium molybdate and thiourea are dissolved in ultrapure water, and hydrochloric acid is dropwise added under the stirring condition to enable the pH value to be about 1. The resulting mixed solution was magnetically stirred for 30min and then transferred to a teflon reaction kettle. Reacting for 24 hours at 180 ℃ by a Teflon reaction kettle to generate black MoS₂Filtering the nanometer flower solution, washing with ultrapure water and ethanol for 3 times, and vacuum freeze drying the obtained material to obtain MoS₂And (4) nano flowers. Take the MoS of this example₂The nanoflower was analyzed by Scanning Electron Microscopy (SEM) and the results are shown in fig. 2.

As can be seen from the sem image of figure 2,the average size of the synthesized material is less than 1 μm, and the morphology of the synthesized material is petal-shaped and is uniformly distributed. MoS₂The large amount of petal-shaped structures provide abundant reactive sites. Mixing MoS₂And carrying out SEM, TEM and XRD detection on the nanoflower catalyst. The analysis finds that the MoS₂The petal-shaped structure of (A) is beneficial to the activation of persulfate. And adding a free radical trapping agent into the reaction system to perform EPR analysis and quenching experiments to find that the catalytic oxidation reaction is a free radical reaction.

As can be seen, the MoS in the embodiment of the present application₂The main function of the nanoflower catalyst as a persulfate activator is MoS₂The nanometer flower catalyst plays a key role in degrading pollutants under the action of ultrasound, and the catalytic oxidation process is a free radical reaction.

Example 3

The application provides an application example of the activation of the second persulfate, which comprises the following specific steps:

adding bisphenol A into deionized water to obtain organic pollutant wastewater to be treated with initial concentration of 10mg/L of bisphenol A, and adding 0.2g/L of MoS prepared in example 2₂Nanometer flower, potassium monopersulfate concentration of 3.25mmol/L, constant temperature ultrasonic treatment at 25 deg.c for 180min, taking out 0.8mL solution for reaction at 180min, filtering with 0.22 micron filtering membrane, adding 0.2mL ethanol as free radical quencher to terminate the degradation reaction, storing in 1.5mL brown liquid phase bottle for determination of bisphenol A concentration, and calculating the bisphenol A degradation efficiency at 180min reaction time.

Through calculation, MoS₂The degradation efficiency of the nanoflower and persulfate system on bisphenol A is 85.67 percent, which shows that MoS₂The nanoflower catalyst can effectively activate persulfate, so that organic pollutants in water can be effectively treated, and the nanoflower catalyst has certain universality in application of treating wastewater.

Example 4

The application provides an application example of the activation of the third persulfate, which comprises the following specific steps:

adding phenol into deionized water to obtain the organic sewage to be treated with the initial concentration of the phenol of 10mg/L0.1g/L, 0.2g/L, 0.3g/L, 0.4g/L and 0.5g/L of MoS of example 1 are respectively added into the dye wastewater₂The concentration of potassium monopersulfate is 3.25mmol/L, ultrasonic treatment is carried out for 180min at the constant temperature of 25 ℃, 0.8mL of solution is taken out to pass through a 0.22 mu m filter membrane when the solution reacts for 180min, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, the solution is stored in a 1.5mL brown liquid phase bottle for measuring the concentration of phenol, and the reaction time is calculated to be 180min, and each different MoS₂The degradation efficiency of phenol in the system of the added amount of the nanoflower. The removal effect of phenol in the system with different catalyst addition amounts is shown in table 1. As can be seen from Table 1, MoS in the present application₂The proper adding concentration of the nanoflower catalyst is 0.2-0.4 g/L, and the more preferable MoS₂The adding concentration of the nanoflower is 0.3g/L, when MoS₂When the concentration of the nanoflower is more than 0.4g/L, due to the interaction of the built-in electric field at the edge of the catalyst, the collision between the separated carriers is enhanced, the acting force is mutually counteracted, and MoS₂The efficiency of the nanoflower for activating the persulfate is rather inhibited, so that the efficiency of the persulfate for degrading the phenol is also inhibited.

TABLE 1

MoS₂Nanometer flower adding amount (g/L)	Degradation efficiency (%)
		0.1	43.06
0.2	95.41
		0.3	98.85
0.4	66.58
		0.5	34.10

Example 5

The application provides an application example of the activation of the fourth persulfate, which comprises the following specific steps:

adding phenol into deionized water to obtain organic pollutant wastewater to be treated with the initial concentration of phenol of 10mg/L, and adding 0.3g/L of MoS prepared in example 1₂Nanometer flower with potassium peroxodisulfate concentration of 3.25mmol/L, performing constant temperature ultrasonic treatment at 25 deg.C for 180min, taking out 0.8mL of solution when reacting for 180min, filtering with 0.22 μm filter membrane, adding 0.2mL of ethanol as free radical quencher to terminate the degradation reaction, storing in 1.5mL of brown liquid phase vial for measuring phenol concentration, and calculating the degradation efficiency of phenol when reacting for 180 min.

Through calculation, MoS₂The degradation efficiency of the nanoflower and potassium peroxodisulfate system on phenol is 27.40%, which shows that MoS₂The nanoflower catalyst also activates the peroxydisulfate salt, allowing the organic contaminants in the water to be treated.

Comparative example 1

The comparative example is MoS₂The nano flower is used for adsorbing and removing organic pollutants in water in a stirring treatment mode, and specifically comprises the following steps:

adding phenol into deionized water to obtain organic pollutant wastewater with initial phenol concentration of 10mg/L, and adding 0.3g/L MoS₂And (3) nano flowers, magnetically stirring at a low speed and a uniform speed (200rpm) for 180min at the temperature of 25 ℃, taking out 0.8mL of solution to pass through a 0.22-micron filter membrane when the nano flowers react for 180min, adding 0.2mL of ethanol serving as a free radical quencher to stop the degradation reaction, storing the nano flowers in a 1.5mL brown liquid-phase vial for measuring the concentration of phenol, and calculating the degradation efficiency of the phenol when the nano flowers react for 180 min.

Under magnetic stirring conditions at 200rpm, MoS alone₂The degradation efficiency of phenol was almost 0 in the presence of nanoflower, indicating that MoS₂The adsorption capacity of the nanoflower to organic pollutants in water is not strong, and the removal of the organic matters is mainly realized by MoS₂The nanoflower is used as a catalyst to activate persulfate to generate free radicals so as to degrade pollutants, and only MoS is used₂The adsorption of the nanoflower has little effect on degrading pollutants.

Comparative example 2

The comparative example is MoS₂The nanoflower is used for activating potassium monopersulfate to remove organic pollutants in water under the magnetic stirring condition, and specifically comprises the following steps:

adding phenol into deionized water to obtain organic pollutant wastewater with initial phenol concentration of 10mg/L, and adding 0.3g/L MoS₂The concentration of the nanoflower, potassium monopersulfate is 3.25mmol/L, the nanoflower is magnetically stirred at a constant speed of 0rpm, 200rpm and 450rpm for 180min at 25 ℃, 0.8mL of solution is taken out to pass through a 0.22-micron filter membrane when the reaction is carried out for 180min, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, the nanoflower is stored in a 1.5mL of brown liquid phase vial for measuring the concentration of phenol, and the degradation efficiency of the phenol is calculated when the reaction time is 180 min. The removal rate of phenol at different rotation speeds is shown in fig. 3.

As can be seen from FIG. 3, the degradation efficiency under different magnetic stirring conditions (different stirring rates) is much worse than the ultrasonic effect under the same system. Therefore, the stirring treatment of MoS₂The deformation disturbance caused by the nanoflower is very small, persulfate cannot be well activated, so that the persulfate can generate free radicals to achieve the effect of degrading organic pollutants, and therefore, under the action of ultrasound, MoS (molecular dynamics)₂The nanoflower can activate persulfate, and can achieve a more excellent pollutant degradation effect.

Comparative example 3

This comparative example is a commercial MoS without nanoflower structure₂The method for degrading organic pollutants in water by catalytically activating potassium monopersulfate comprises the following specific steps:

adding phenol into deionized water to obtain organic pollutant wastewater to be treated with the initial concentration of phenol of 10mg/L, and dividing into three parts:

a (marked as ultrasonic/PMS in figure 4) is that potassium monopersulfate is added at the concentration of 3.25mmol/L, ultrasonic treatment is carried out at the constant temperature of 25 ℃ for 180min, 0.8mL of solution is taken out and filtered through a 0.22 mu m filter membrane when the solution is 0min, 10min, 30min, 60min, 90min, 120min, 150min and 180min, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, and the solution is stored in a 1.5mL brown liquid phase bottle for measuring the concentration of phenol. And after the reaction is finished, collecting the waste liquid into a waste liquid barrel, and uniformly treating.

b (labeled ultrasound/PMS/commercial MoS in FIG. 4)₂) For adding 0.2g/L of commercial MoS₂(commercial MoS)₂Layered structure without petal-shaped structure), the concentration of potassium monopersulfate is 3.25mmol/L, ultrasonic treatment is carried out at constant temperature of 25 ℃ for 180min, 0.8mL of solution is taken out and filtered through a 0.22 mu m filter membrane at 0min, 10min, 30min, 60min, 90min, 120min, 150min and 180min, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, and the solution is stored in a 1.5mL brown liquid phase bottle for measuring the concentration of phenol. And after the reaction is finished, collecting the waste liquid into a waste liquid barrel, and uniformly treating.

c (labeled ultrasound/PMS/MoS in FIG. 4)₂NFs) was added 0.2g/L of MoS₂NFs, the concentration of persulfate is 3.25mmol/L, ultrasonic treatment is carried out for 180min at constant temperature under the condition of 25 ℃, 0.8mL of solution is taken out and filtered through a 0.22 μm filter membrane when 0min, 10min, 30min, 60min, 90min, 120min, 150min and 180min are carried out, 0.2mL of ethanol is added as a free radical quencher to stop the degradation reaction, and the solution is stored in a 1.5mL brown liquid phase bottle for measuring the concentration of phenol. And after the reaction is finished, collecting the waste liquid into a waste liquid barrel, and uniformly treating.

The phenol concentration of the three different systems at different times is detected, and the result is shown in fig. 4, and fig. 4 is the removal effect of the persulfate activation method provided in comparative example 3 of the present application on the degradation of phenol in different systems (organic pollutant concentration-time curve). As shown in FIG. 4, the degradation efficiency of phenol was calculated by measuring the concentration of phenol in the reaction and subjecting the reaction to ultrasonic reaction for 180min, using commercial MoS₂In the system, the removal rate of phenol is only 16.98 percent and is far lower than that of added MoS₂A nanoflower system. Illustrating the comparative general commercial MoS₂MoS synthesized in example 1 of the present application₂NFs the peculiar petal structure of the product has key effect on activating persulfate and degrading organic pollutants in water under ultrasonic condition.

The formula for calculating the degradation efficiency in the above embodiment is:

wherein C0 is the initial concentration of the organic pollutant, and Ct is the concentration of the organic pollutant at time t.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for activating persulfate is characterized by comprising the following steps:

2. The activation method according to claim 1, wherein the power of the ultrasonic wave is 50 to 500W, the frequency of the ultrasonic wave is 30 to 100KHZ, and the temperature of the ultrasonic wave is 10 to 50 ℃.

3. The activation method according to claim 1, wherein the persulfate is selected from one or more of potassium persulfate, sodium persulfate, calcium persulfate, ammonium persulfate, potassium monopersulfate, sodium monopersulfate, calcium monopersulfate, and ammonium monopersulfate.

4. According to the claimsThe activation method of claim 1, wherein the concentration of the persulfate is 0.1 to 5 mmol/L; the MoS₂The concentration of the nanoflower is 0.1-2.0 g/L.

5. The activation method according to claim 1, wherein the MoS is₂The structure of the nanometer flower is a petal-shaped structure, and the petal edge of the petal-shaped structure is provided with 0-10 layers of MoS₂And (5) structure.

6. The activation method according to claim 1, wherein the MoS is₂The preparation method of the nanoflower comprises the following steps:

7. The activation method according to claim 6, wherein in the step 1, the mass ratio of the molybdate to the thiourea is 1: (1-5).

8. The activation method according to claim 6, wherein in the step 2, the temperature of the hydrothermal reaction is 150 to 230 ℃, and the time of the hydrothermal reaction is 20 to 25 hours.

9. Use of the activation method of any one of claims 1 to 8 for the remediation of environmental pollution.

10. Use of the activation process of any one of claims 1 to 8 for the degradation of organic contaminants.