Method for synthesizing silver Prussian blue catalyst through tannic acid mediation, silver Prussian blue catalyst and application of silver Prussian blue catalyst

Abstract

The invention discloses a method for synthesizing a silver Prussian blue catalyst through tannic acid mediation, the silver Prussian blue catalyst and application of the silver Prussian blue catalyst, and aims to provide a catalyst for efficiently catalyzing peroxymonosulfate to degrade parachlorophenol. According to the catalyst provided by the invention, the silver coordination Prussian blue catalyst is prepared through a one-step reaction of complexing tannic acid with potassium ferrocyanide and silver nitrate; the catalyst is simple in preparation process, low in toxicity, mild in catalytic condition and high in degradation rate, and efficient degradation of organic pollutants in a water environment is realized; belongs to the technical field of organic pollutant treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of organic pollutant treatment, and in particular relates to a silver Prussian blue catalyst and a preparation method and application thereof. Background Art

[0002] As important industrial raw materials and intermediates, a large amount of chlorophenol compounds enter the water environment every year with the wastewater discharged by industrial complexes such as coal chemical, textile, pharmaceutical and steel manufacturing, posing a huge threat to the ecosystem and human life and health. Due to the stable conjugated system of the benzene ring and chlorine atom of chlorophenol compounds, the traditional chemical oxidation method is not ideal for the degradation of chlorophenol compounds.

[0003] Persulfate-based advanced oxidation technology is widely used to deeply treat persistent organic pollutants in water. 2 O 2 Compared with the advanced oxidation technology that produces hydroxyl radicals, the advanced oxidation of activated persulfate has stronger oxidation ability and a wider pH range of application. In addition, from the characteristics of the oxidant itself that produces free radicals, persulfate has lower requirements for storage conditions and lower costs, and its oxidation process is safer, with better application prospects and commercial value.

[0004] Prussian blue is a classic ferric ferrocyanide coordination compound with the advantages of low biological toxicity, strong catalytic activity, high stability, and functional modification. The iron ions in Prussian blue can break the peroxide bond of persulfate through electron transfer to generate active substances such as sulfate radicals, thereby efficiently activating PMS to degrade p-chlorophenol. However, the improvement of Prussian blue. The formation of silver-coordinated Prussian blue analogs can promote Fe 2+ / Fe 3+ Cycle, to achieve the synergistic activation of PMS by Fe and Ag. At the same time, tannic acid, as a natural polyphenol compound, can reduce silver ions and form stable coordination bonds with metal ions, mediating the synthesis of small-sized silver Prussian blue catalysts with stronger catalytic activity and solving the problem of low yield of silver Prussian blue. Summary of the invention

[0005] In order to overcome the deficiencies in the prior art, the first object of the present invention is to provide a tannic acid-mediated synthesis of a silver Prussian catalyst, which uses tannic acid as a complexing agent and is prepared by a one-step reaction of silver nitrate and potassium ferrocyanide to obtain TA-AgPB, which is used to efficiently activate PMS to degrade p-chlorophenol.

[0006] The second object of the present invention is to provide a method for synthesizing a silver Prussian catalyst mediated by tannic acid, wherein the raw material toxicity of the method is low and the preparation process is simple.

[0007] Another object of the present invention is to provide an application and method of a silver Prussian blue catalyst for catalyzing the degradation of p-chlorophenol in water by peroxymonosulfate, wherein the method can efficiently oxidize and degrade p-chlorophenol under mild degradation conditions.

[0008] To this end, the first technical solution provided by the present invention is as follows:

[0009] A method for synthesizing a silver Prussian blue catalyst mediated by tannic acid, the preparation method of which is as follows: adding tannic acid, silver nitrate and potassium ferrocyanide into deionized water at 80-90°C and stirring for reaction for 4-8h, cooling to room temperature and then taking out, centrifuging, washing and drying in sequence to obtain the catalyst.

[0010] Furthermore, in the above-mentioned method for synthesizing silver Prussian blue catalyst mediated by tannic acid, in the reaction system, the molar ratio of silver nitrate, potassium ferrocyanide and tannic acid concentration is 10-20:10-20:1, preferably 16:16:1.

[0011] Furthermore, in the above-mentioned method for synthesizing silver Prussian blue catalyst mediated by tannic acid, the temperature of the stirring reaction is 85°C.

[0012] Furthermore, in the above-mentioned method for synthesizing silver Prussian blue catalyst mediated by tannic acid, the hydrothermal reaction time is 6 hours.

[0013] The second technical solution of the present invention is a silver Prussian blue catalyst prepared by the first technical solution. The silver Prussian blue catalyst has a cubic structure and a size range of 10-100 nm.

[0014] Another technical solution of the present invention is to provide the use of silver Prussian blue catalyst for catalyzing the degradation of p-chlorophenol in water by peroxymonosulfate.

[0015] The specific method of using the silver Prussian blue catalyst to catalyze the degradation of p-chlorophenol in water by peroxymonosulfate is as follows: dispersing the silver Prussian blue catalyst in a p-chlorophenol solution, stirring and mixing, and then adding peroxymonosulfate; after the degradation is completed, taking the suspension, filtering, and then adding methanol to terminate the reaction.

[0016] Furthermore, in the above-mentioned application method of the silver Prussian blue catalyst, the concentration of p-chlorophenol is 5 to 20 mg / L, preferably 10 mg / L.

[0017] Furthermore, in the above-mentioned application method of the silver Prussian blue catalyst, the concentration of the catalyst is 0.1-0.25 g / L, preferably 0.2 g / L.

[0018] Furthermore, in the above-mentioned method for applying the silver Prussian blue catalyst, the concentration of the peroxymonosulfate is 0.1-0.5 g / L, preferably 0.3 g / L.

[0019] Furthermore, in the above-mentioned application method of the silver Prussian blue catalyst, the initial pH range of the treatment liquid is 3-11, preferably pH=7.

[0020] Furthermore, the volume ratio of methanol to the suspension is 0.5-2:1, preferably 1:1.

[0021] Compared with the prior art, the technical solution provided by the present invention has the following technical advantages:

[0022] 1. The silver Prussian blue catalyst provided by the present invention uses tannic acid as a complexing agent, and TA-AgPB is prepared by a one-step reaction of silver nitrate and potassium ferrocyanide, which is used to efficiently activate PMS to degrade para-chlorophenol. The tannic acid used in the technical solution provided by this application is a natural compound with abundant sources, which is cheap and easy to obtain, and has excellent reducibility and chelating ability; compared with citric acid, tannic acid has a higher yield and stronger stability in preparing the silver Prussian blue catalyst. In addition, the smaller size of the silver Prussian blue catalyst will expose more active sites of the catalyst, and it has stronger catalytic activity.

[0023] 2. The catalyst provided by the present invention and PMS constitute a new advanced oxidation technology system, which increases Fe 3+ Reduction to Fe 2+ The efficiency of the reaction is improved, and the synergistic effect is enhanced, which promotes the peroxide bond breakage of PMS to produce active oxygen, such as OH and SO4 ·- Etc., which can efficiently oxidize and degrade p-chlorophenol, and has the advantages of high efficiency, stability, and mild degradation conditions.

[0024] 3. The catalyst provided by the present invention has the advantages of low toxicity, simple preparation process, low cost and high stability. It can achieve efficient degradation of organic pollution, has good practical application prospects, and provides a reference for the development of a new PMS-based advanced oxidation technology system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 SEM images of TA-AgPB (a), TP-AgPB (b), CA-AgPB (c) and FePB (d);

[0026] Figure 2 Near infrared spectra of different materials;

[0027] Figure 3 This is a diagram showing the effect of the silver Prussian blue catalyst prepared in Example 1 on catalyzing PMS to degrade p-chlorophenol at different concentrations;

[0028] Figure 4 This is a graph showing the degradation effect of the silver Prussian blue catalyst prepared in Example 1 on the degradation of p-chlorophenol at different concentrations by PMS;

[0029] Figure 5 This is a graph showing the degradation effect of the silver Prussian blue catalyst prepared in Example 1 on the degradation of p-chlorophenol at different PMS concentrations;

[0030] Figure 6 This is a diagram showing the effect of the silver Prussian blue catalyst prepared in Example 1 on catalyzing the degradation of p-chlorophenol by PMS at different initial pH values;

[0031] Figure 7 This is a diagram showing the degradation effect of PMS on chlorophenol catalyzed by different catalysts. DETAILED DESCRIPTION

[0032] The technical scheme in the present invention will be clearly and completely described below in conjunction with specific embodiments. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The reagents in this embodiment are all commercially available products. It should be noted that, in the absence of conflict,

[0033] Example 1

[0034] This embodiment provides a silver Prussian blue catalyst, and the synthesis method comprises the following steps in sequence:

[0035] (1) Add 80 mL of deionized water to a beaker and heat to 85° C., then add 170.1 mg (0.1 mmol) of tannic acid, 271.8 mg (1.6 mmol) of silver nitrate and 589.4 mg (1.6 mmol) of potassium ferrocyanide while stirring, and stir to obtain a mixed solution;

[0036] (2) The reaction system was maintained at 85° C. and stirred continuously for 6 h. After the reaction was completed, the precipitate was collected by centrifugation, washed three times with anhydrous ethanol, and dried in an oven at 60° C. for 12 h to obtain a silver Prussian blue catalyst, which was recorded as TA-AgPB.

[0037] The SEM image of the catalyst is shown in Figure 1 ,Depend on Figure 1 (a) It can be seen that the silver Prussian blue catalyst has a regular cubic structure similar to Prussian blue, with a size of about 10-100nm. Figure 2 It can be seen that the silver Prussian blue catalyst has a peak at 2071 cm -1 The characteristic cyanide peak in Prussian blue was detected at the same time, and the characteristic peak corresponding to tannic acid could also be detected.

[0038] Example 2

[0039] This embodiment provides a silver Prussian blue catalyst, and the synthesis method comprises the following steps in sequence:

[0040] (1) Add 80 mL of deionized water to a beaker and heat to 85° C., then add 170.1 mg (0.1 mmol) of tannic acid, 339.8 mg (2 mmol) of silver nitrate and 736.8 mg (2 mmol) of potassium ferrocyanide while stirring, and stir to obtain a mixed solution;

[0041] (2) The reaction system was maintained at 85° C. and stirred continuously for 6 h. After the reaction was completed, the precipitate was collected by centrifugation, washed three times with anhydrous ethanol, and dried in an oven at 60° C. for 12 h to obtain a silver Prussian blue catalyst.

[0042] Example 3

[0043] This embodiment provides a silver Prussian blue catalyst, and the synthesis method comprises the following steps in sequence:

[0044] (1) Add 80 mL of deionized water to a beaker and heat to 85° C., then add 170.1 mg (0.1 mmol) of tannic acid, 169.9 mg (1 mmol) of silver nitrate and 368.4 mg (1 mmol) of potassium ferrocyanide while stirring, and stir to obtain a mixed solution;

[0045] (2) The reaction system was maintained at 85° C. and stirred continuously for 6 h. After the reaction was completed, the precipitate was collected by centrifugation, washed three times with anhydrous ethanol, and dried in an oven at 60° C. for 12 h to obtain a silver Prussian blue catalyst.

[0046] Example 4

[0047] This embodiment provides a silver Prussian blue catalyst, and the synthesis method comprises the following steps in sequence:

[0048] (1) Add 80 mL of deionized water to a beaker and heat to 85° C., then add 170.1 mg (0.1 mmol) of tannic acid (1.6 mmol), 271.8 mg (1.6 mmol) of silver nitrate and 589.4 mg of potassium ferrocyanide while stirring, and stir to obtain a mixed solution;

[0049] (2) The reaction system was maintained at 85° C. and stirred continuously for 4 h. After the reaction was completed, the precipitate was collected by centrifugation, washed three times with anhydrous ethanol, and dried in an oven at 60° C. for 12 h to obtain a silver Prussian blue catalyst.

[0050] Example 5

[0051] This embodiment provides a silver Prussian blue catalyst, and the synthesis method comprises the following steps in sequence:

[0052] (1) Add 80 mL of deionized water to a beaker and heat to 85° C., then add 170.1 mg (0.1 mmol) of tannic acid, 271.8 mg (1.6 mmol) of silver nitrate and 589.4 mg (1.6 mmol) of potassium ferrocyanide while stirring, and stir to obtain a mixed solution;

[0053] (2) The reaction system was maintained at 85° C. and stirred continuously for 8 h. After the reaction was completed, the precipitate was collected by centrifugation, washed three times with anhydrous ethanol, and dried in an oven at 60° C. for 12 h to obtain a silver Prussian blue catalyst.

[0054] Application Example 1

[0055] This application example provides an application of a silver Prussian blue catalyst in the degradation of p-chlorophenol, and the specific steps are as follows:

[0056] The TA-AgPB prepared in Example 1 was dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in the degradation product was 0, 0.1, 0.15, 0.2, and 0.25 g / L, respectively; potassium permonosulfate (PMS) was added to the above solution so that the PMS concentration was 0.3 g / L, and the degradation of p-chlorophenol was started; 1 mL of the suspension was collected from the reaction system using a syringe at 0, 2, 4, 6, 8, and 10 min of degradation, respectively, and filtered through a 0.22 μm filter, 1 mL of methanol was added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution was determined by high performance liquid chromatography.

[0057] The calculation formula of the degradation rate of para-chlorophenol is as follows:

[0058]

[0059] Among them, C 0 is the initial concentration of p-chlorophenol;

[0060] C t is the concentration of p-chlorophenol when the reaction reaches time t;

[0061] Degradation effects such as Figure 3 As shown, when the catalyst dosage is 0.2 g / L and 0.25 g / L, about 99% of the p-chlorophenol in the system is degraded. Considering the economic cost and benefit, a catalyst concentration of 0.2 g / L is selected as the preferred condition.

[0062] Application Example 2

[0063] This application example provides an application of a silver Prussian blue catalyst in the degradation of p-chlorophenol, and the specific steps are as follows:

[0064] The TA-AgPB obtained in Example 1 was dispersed in 5, 10, 15, and 20 mg / L p-chlorophenol solutions, respectively, so that the catalyst concentration in each degradation body was 0.2 g / L, respectively; PMS was added to the above solution so that the PMS concentration in the solution was 0.3 g / L, and the degradation of p-chlorophenol was started; after a certain period of degradation, 1 mL of the suspension was collected from the reaction system using a syringe, and filtered through a 0.22 μm filter, 1 mL of methanol was added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution was determined by high performance liquid chromatography.

[0065] Degradation effects such as Figure 4 As shown, when the concentration of p-chlorophenol is 5 mg / L and 10 mg / L, the degradation system can achieve efficient degradation within 10 min. Considering the economic cost and benefit, a p-chlorophenol concentration of 10 mg / L is selected as the optimal condition.

[0066] Application Example 3

[0067] This application example provides an application of a silver Prussian blue catalyst in the degradation of p-chlorophenol, and the specific steps are as follows:

[0068] The TA-AgPB obtained in Example 1 was dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in each degradation body was 0.2 g / L; a certain amount of PMS was added to the above solution so that the PMS concentration in the solution was 0, 0.1, 0.2, 0.3, 0.4, and 0.5 g / L, respectively, and the degradation of p-chlorophenol was started; after a certain period of degradation, 1 mL of the suspension was collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol was added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution was determined by high performance liquid chromatography.

[0069] Degradation effects such as Figure 5 As shown, when the concentration of PMS is 0.3 g / L, 0.4 g / L and 0.5 g / L, the degradation rate of p-chlorophenol can reach 99%. Considering the economic cost and benefit, the PMS concentration of 0.3 g / L is selected as the optimal condition.

[0070] Application Example 4

[0071] This application example is the same as application example 1, except that the initial pH of the solution is different, as follows:

[0072] The TA-AgPB obtained in Example 1 was dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in each degradation body was 0.2 g / L, and the initial pH of the solution was adjusted to 3, 5, 6.2 (unadjusted), 7, 9, and 11, respectively; PMS was added to the above solution so that the PMS concentration in the solution was 0.2 g / L, and the degradation of p-chlorophenol was started; after a certain period of degradation, 1 mL of the suspension was collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol was added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution was determined by high performance liquid chromatography.

[0073] Degradation effects such as Figure 6 As shown, the degradation system exhibits excellent degradation effects in the range of pH = 5 to 7. Considering the economic cost and benefit, there is no need to adjust the pH of the solution during the degradation process.

[0074] Comparative Example 1

[0075] Preparation of tea polyphenol-mediated synthesis of silver Prussian blue catalyst and its application in the degradation of p-chlorophenol

[0076] The method of synthesizing silver Prussian blue catalyst mediated by tea polyphenols is as follows: 80 mL of deionized water is added to a beaker and heated to 85°C, and then 112.5 mg of tea polyphenols, 271.8 mg of silver nitrate and 589.4 mg of potassium ferrocyanide are added while stirring; the reaction system is kept at 85°C and stirred for 6 hours. After the reaction is completed, the precipitate is collected by centrifugation and washed with anhydrous ethanol three times, and then dried in an oven at 60°C for 12 hours to obtain the silver Prussian blue catalyst synthesized by tea polyphenols, which is recorded as TP-AgPB. Figure 1 (b) It can be seen that the size of TP-AgPB is larger than that of TA-AgPB. Figure 2 It can be seen that both TA-AgPB and TP-AgPB have the characteristic cyano peak in Prussian blue.

[0077] Application of tea polyphenol-mediated synthesized silver Prussian blue catalyst in the degradation of p-chlorophenol: TP-AgPB is dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in the degradation product is 0.2 g / L; PMS is added to the above solution so that the PMS concentration is 0.3 g / L, and the degradation of p-chlorophenol begins; after a certain period of degradation, 1 mL of the suspension is collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol is added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution is determined by high performance liquid chromatography.

[0078] Comparative Example 2

[0079] Preparation of citric acid-mediated synthesis of silver Prussian blue catalyst and its application in the degradation of p-chlorophenol

[0080] Method for synthesizing silver Prussian blue catalyst mediated by citric acid: add 80 mL of deionized water to a beaker and heat to 85°C, then add 84.1 mg of citric acid, 271.8 mg of silver nitrate and 589.4 mg of potassium ferrocyanide while stirring; keep the reaction system at 85°C and stir continuously for 6 hours. After the reaction is completed, collect the precipitate by centrifugation and wash it with anhydrous ethanol three times, and dry it in a 60°C oven for 12 hours to obtain the tea polyphenol-mediated synthesis of silver Prussian blue catalyst, which is recorded as CA-AgPB. Figure 1 (c) It can be seen that the sizes of CA-AgPB and TA-AgPB are similar, but the cubic structure of CA-AgPB is more obvious. Figure 2 It can be seen that both CA-AgPB and TP-AgPB have the characteristic cyano peak in Prussian blue, and TP-AgPB also detects the characteristic peak belonging to tannic acid.

[0081] Application of silver Prussian blue catalyst synthesized by citric acid in the degradation of p-chlorophenol: CA-AgPB is dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in the degradation product is 0.2 g / L; PMS is added to the above solution so that the PMS concentration is 0.3 g / L, and the degradation of p-chlorophenol begins; after a certain period of degradation, 1 mL of the suspension is collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol is added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution is determined by high performance liquid chromatography.

[0082] Comparative Example 3

[0083] Preparation of Iron Prussian Blue Catalyst and Its Application in the Degradation of p-Chlorophenol

[0084] The method of iron Prussian blue catalyst is as follows: add 80mL of deionized water to a beaker and heat it to 85°C, then add 84.1mg of citric acid, 259.5mg of ferric chloride and 589.4mg of potassium ferrocyanide while stirring; keep the reaction system at 85°C and stir continuously for 6h. After the reaction is completed, collect the precipitate by centrifugation and wash it with anhydrous ethanol three times, and dry it in a 60°C oven for 12h to obtain the tea polyphenol-mediated synthesis of silver Prussian blue catalyst, which is recorded as FePB. Figure 1 (d) It can be seen that the size of FePB is similar to that of TA-AgPB.

[0085] Application of iron Prussian blue catalyst in the degradation of p-chlorophenol: FePB is dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in the degradation product is 0.2 g / L; PMS is added to the above solution so that the PMS concentration is 0.3 g / L, and the degradation of p-chlorophenol begins; after a certain period of degradation, 1 mL of the suspension is collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol is added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution is determined by high performance liquid chromatography.

[0086] Comparative Example 4

[0087] Preparation of tannic acid-mediated synthesis of iron Prussian blue catalyst and its application in the degradation of chlorophenols

[0088] The method of preparing the iron Prussian blue catalyst is as follows: add 80 mL of deionized water into a beaker and heat to 85°C, then add 170.1 mg of tannic acid, 259.5 mg of ferric chloride and 589.4 mg of potassium ferrocyanide while stirring; keep the reaction system at 85°C and stir continuously for 6 hours. After the reaction is completed, collect the precipitate by centrifugation and wash it with anhydrous ethanol for 3 times, and dry it in an oven at 60°C for 12 hours to obtain the silver Prussian blue catalyst mediated by tea polyphenols, which is recorded as TA-FePB.

[0089] Application of iron Prussian blue catalyst in the degradation of p-chlorophenol: TA-FePB is dispersed in a 10 mg / L p-chlorophenol solution so that the catalyst concentration in the degradation product is 0.2 g / L; PMS is added to the above solution so that the PMS concentration is 0.3 g / L, and the degradation of p-chlorophenol begins; after a certain period of degradation, 1 mL of the suspension is collected from the reaction system using a syringe and filtered through a 0.22 μm filter, 1 mL of methanol is added to the filtered solution to terminate the reaction, and the concentration of p-chlorophenol in the solution is determined by high performance liquid chromatography.

[0090] Depend on Figure 7 It can be seen that the degradation rate of the TA-AgPB / PMS degradation system is the highest, and the degradation rate of para-chlorophenol reaches 99% in 10 minutes. The catalytic activity of the silver Prussian blue catalyst synthesized by the traditional complexing agent citric acid is significantly lower than that of TA-AgPB, and the degradation rate of para-chlorophenol is 54%. Also as a common natural polyphenol compound, the silver Prussian blue catalyst synthesized by tea polyphenols can activate PMS to remove 83% of para-chlorophenol, which proves the superiority of tannic acid as a complex. In addition, the catalytic activity of the iron Prussian blue catalyst synthesized by iron Prussian blue and tannic acid is much lower than that of the silver Prussian blue catalyst synthesized by the three compounds, which shows that the introduction of Ag significantly improves the Fe 3+ Reduction to Fe 2+ efficiency and play a synergistic role.

[0091] In summary, the present invention uses tannic acid as a complexing agent to prepare a new catalyst TA-AgPB in a one-step reaction for the first time, and forms a new advanced oxidation technology system with PMS to efficiently degrade p-chlorophenol and synergize. The catalyst provided by the present invention has the advantages of low toxicity, simple preparation process, low cost and high stability, can achieve efficient degradation of organic pollution, and has good practical application prospects.

[0092] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. For those skilled in the art, changes or substitutions can be easily conceived, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims

1. A method for synthesizing a silver Prussian blue catalyst mediated by tannic acid, characterized in that: Add tannic acid, silver nitrate and potassium ferrocyanide to deionized water at 80-90° C. and stir to react for 4-8 hours, cool to room temperature and take out, centrifuge to collect precipitate, wash and dry in sequence to obtain a silver Prussian blue catalyst; The molar ratio of the silver nitrate, potassium ferrocyanide and tannic acid is 10-20:10-20:

1.

2. The method for synthesizing silver Prussian blue catalyst mediated by tannic acid according to claim 1, characterized in that: The washing is performed by using anhydrous ethanol.

3. The method for synthesizing silver Prussian blue catalyst mediated by tannic acid according to claim 1, characterized in that: The drying is carried out in an oven at 50-70°C for 6-18 hours.

4. A silver Prussian blue catalyst, characterized in that A silver Prussian blue catalyst obtained by the synthesis method as described in any one of claims 1 to 3.

5. The silver Prussian blue catalyst according to claim 4, characterized in that The silver Prussian blue catalyst has a cubic structure and a size of 10-100 nm.

6. The silver Prussian blue catalyst according to claim 5 is used for catalyzing the degradation of p-chlorophenol in water by peroxymonosulfate.

7. The method of claim 5 for catalyzing the degradation of p-chlorophenol in water by permonosulfate with the silver-Prussian blue catalyst, comprising dispersing the silver-Prussian blue catalyst in a p-chlorophenol solution, stirring and mixing, adding permonosulfate, and after the degradation is completed, taking the suspension, filtering, and adding methanol to terminate the reaction.

8. The method of claim 6 wherein the silver Prussian blue catalyst is used to catalyze the degradation of p-chlorophenol by peroxymonosulfate, characterized in that: In the treatment system, the concentration of p-chlorophenol is 5-20 mg / L, the concentration of the catalyst is 0.1-0.25 g / L, the concentration of peroxymonosulfate is 0.1-0.5 g / L, and the initial pH range of the treatment solution is 3-11.

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