Preparation method and application of biogas residue carbon activator and method for degrading organic pollutants in water

Abstract

The invention relates to the technical field of water treatment and biogas residue carbon activators, in particular to a preparation method and application of a biogas residue carbon activator and a method for degrading organic pollutants in water, and the preparation method comprises the following steps: mixing biogas residues and waste plastics, and roasting and carbonizing. The biogas residue carbon activating agent has a porous structure, a large specific surface area and adsorption capacity, activation of persulfate is effectively promoted, and the degradation capacity of the activating agent on organic pollutants is enhanced. The preparation method has the obvious advantages of being simple in technological process, low in cost, environmentally friendly and the like, the biogas residue carbon activating agent is prepared from biogas residues, waste plastics and other environment-friendly materials, resource utilization of waste is achieved, negative effects on the environment are reduced, and good economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas residue carbon activators, and specifically, to a preparation method and application of a biogas residue carbon activator. In addition, the present invention also relates to a method for degrading organic pollutants in water. Background Art

[0002] In recent years, research on the degradation of organic pollutants in water environment based on persulfate-based advanced oxidation technology has been widely applied. Methods such as high-temperature pyrolysis, transition metal ions, light radiation, activated carbon, zero-valent iron, etc. can activate persulfate, and after activation, strong oxidizing free radicals or non-free radicals can be generated during the reaction process, which react with organic pollutants through oxidation reactions to degrade the pollutants into harmless or easily biodegradable intermediate products. The biogas residue carbon prepared from waste biomass such as wood, sludge, manure, and agricultural residues is usually used as an adsorbent to adsorb organic pollutants in water, and the complete removal of organic pollutants has not been achieved, and there are problems such as complex subsequent recovery treatment and cumbersome steps; in addition, even when it is used as a catalyst to activate persulfate, there are problems such as poor activation effect, large catalyst dosage, long treatment time, and low dye removal rate in water, making it difficult to achieve the purpose of efficiently degrading dyes in water. Therefore, there is an urgent need to find a low-cost and efficient method to improve the catalytic activity of the biogas residue carbon activator. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of complex processes, high costs, and the need to improve the adsorption effect on organic pollutants in the existing technology for treating water polluted by organic pollutants, thereby providing a preparation method and application of a biogas residue carbon activator, and also relating to a method for removing organic pollutants in water. This biogas residue carbon activator can effectively promote the activation of persulfate to efficiently degrade organic pollutants in water. At the same time, its preparation method has obvious advantages of simple process flow, low cost, and environmental friendliness. Using environmental protection materials such as biogas residue and waste plastics to prepare the biogas residue carbon activator can promote the generation of pores, thereby expanding its specific surface area and adsorption capacity, promoting the activation ability of persulfate, enhancing the adsorption capacity of the biogas residue carbon activator itself for organic pollutants in water, and realizing the resource utilization of waste, reducing the negative impact on the environment, and having better economic benefits.

[0004] To achieve the above object, on the one hand, the present invention provides a preparation method of a biogas residue carbon activator, characterized in that the preparation method includes: mixing biogas residue and plastic and then performing roasting and carbonization.

[0005] Preferably, the plastic is selected from at least one of polyethylene, polypropylene, and polystyrene.

[0006] More preferably, the plastic is polypropylene.

[0007] Preferably, the mass ratio of the biogas residue to the plastic is 1:0.5 - 1.

[0008] Preferably, the conditions of the carbonization reaction include: a roasting temperature of 600 - 700 °C, a time of 2 - 3 h, and a heating rate of 5 - 15 °C / min.

[0009] The second aspect of the present invention provides a biogas residue carbon activator prepared by the method as described above.

[0010] The third aspect of the present invention provides an application of the biogas residue carbon activator as described above in removing organic pollutants in water.

[0011] Preferably, the organic pollutants are selected from at least one of rhodamine B, acid orange, methyl orange, malachite green, orange G, and bisphenol A.

[0012] More preferably, the organic pollutant is rhodamine B.

[0013] The fourth aspect of the present invention provides a method for removing organic pollutants in water, which is characterized in that the method includes: mixing sewage containing organic pollutants, persulfate, and the biogas residue carbon activator as described above.

[0014] Preferably, the conditions of the mixing include: a temperature of 20 - 30 °C, a time of 4 - 5 h, and a pH of 2 - 6.

[0015] Preferably, the mixing is carried out in a shaker.

[0016] Preferably, relative to 1 g of the organic pollutant, the dosage of the biogas residue carbon activator is 15 - 30 g.

[0017] Preferably, relative to 1 g of the organic pollutant, the dosage of the persulfate is 1.19 - 2.38 g.

[0018] Preferably, the persulfate is selected from at least one of sodium persulfate, potassium persulfate, potassium hydrogen persulfate, and ammonium persulfate; the organic pollutants are selected from at least one of rhodamine B, acid orange, methyl orange, malachite green, orange G, and bisphenol A.

[0019] Preferably, in the sewage containing organic pollutants, the content of the organic pollutant is 45 - 55 mg / L.

[0020] Preferably, the concentration of the persulfate is 5 - 15 mM.

[0021] Through the above technical solution, the method provided by the present invention uses a high-temperature carbonization method to treat biogas residue and plastics to prepare a porous biogas residue carbon activator for activating persulfate, stimulating its degradation function of organic pollutants in water, enhancing its own adsorption capacity for organic pollutants in water, and realizing the resource utilization of biogas residue carbon at the same time. It can adapt to different water quality conditions and treatment requirements, can be used multiple times, and further reduces the treatment cost. The preparation method of the present invention is a sustainable preparation technology for porous biogas residue carbon activator, which can continuously provide high-efficiency and stable adsorbents to meet the long-term water pollution treatment needs. The research and application of the preparation method of the biogas residue carbon activator of the present invention have promoted scientific research and technological innovation in the field of water pollution treatment, and provided new ideas and methods for the treatment of other similar pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Standard curve graph of the rhodamine B solution provided for the test example. DETAILED DESCRIPTION OF THE INVENTION

[0023] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0024] As described above, the first aspect of the present invention provides a method for preparing a biogas residue carbon activator, which includes: mixing biogas residue and plastics and then roasting and carbonizing them.

[0025] There is no particular limitation on the mixing, and any one of stirring mixing and shaking mixing can be selected, as long as the biogas residue and plastics can be completely mixed evenly.

[0026] During the research process, the inventors found that using plastics to prepare biogas residue carbon activator can continuously provide high-efficiency and stable adsorbents. In addition, the porous structure effect obtained by co-roasting biogas residue and plastics at high temperature can make the adsorption performance and activation performance of biogas residue carbon activator for persulfate higher.

[0027] According to the present invention, preferably, the plastic is selected from at least one of polyethylene, polypropylene and polystyrene. Further preferably, the plastic is polypropylene. There is no particular limitation on the degree of fragmentation of the plastic in the present invention, and it can be cut into pieces with scissors and mixed evenly with the biogas residue.

[0028] According to the present invention, preferably, the mass ratio of the biogas residue to the plastic is 1:0.5 - 1, specifically, it can be 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:1, or any value between these values. It has been found through research that controlling the mass ratio of the biogas residue to the plastic within the above range can effectively improve the adsorption performance of the biogas residue carbon activator and enhance the activation effect on persulfate.

[0029] According to the present invention, preferably, the conditions for the carbonization reaction include: the temperature is 600 - 700 °C, specifically, it can be 600 °C, 620 °C, 630 °C, 650 °C, 680 °C, 700 °C, or any value between these values; the time is 2 - 3 h, specifically, it can be 2 h, 2.2 h, 2.4 h, 2.6 h, 3 h, or any value between these values; the heating rate is 5 - 15 °C / min, specifically, it can be 5 °C / min, 8 °C / min, 10 °C / min, 12 °C / min, 13 °C / min, 15 °C / min, or any value between these values. The inventors have found through research that preparing the biogas residue carbon activator in the above preferred manner can further improve the adsorption effect of the biogas residue carbon activator and the activation effect on persulfate.

[0030] The second aspect of the present invention provides a biogas residue carbon activator, which is prepared by the method as described above.

[0031] As an adsorbent for organic pollutants in water and an activator for persulfate, this biogas residue carbon activator can meet the requirements of sustainable water pollution treatment, and its adsorption performance and activation performance for persulfate are more efficient and stable. The research and application of this biogas residue carbon activator have promoted the progress and innovation of scientific research and technology in the field of water pollution treatment.

[0032] The third aspect of the present invention provides an application of the biogas residue carbon activator prepared by the method as described above in removing organic pollutants from water. The inventors have found through research that the biogas residue carbon activator prepared by the present invention has a more obvious effect on removing organic pollutants from water.

[0033] According to the present invention, preferably, the organic pollutant is selected from at least one of rhodamine B, acid orange, methyl orange, malachite green, orange G, and bisphenol A. Further preferably, the organic pollutant is rhodamine B. The inventors have found through research that when the organic pollutant is rhodamine B, the biogas residue carbon activator has a more obvious removal effect on it.

[0034] The fourth aspect of the present invention provides a method for removing organic pollutants in water, which includes: mixing the biogas residue carbon activator as described above with sewage containing organic pollutants and persulfate. The mixing is not particularly limited and can be selected from any one of stirring mixing and shaking mixing, as long as the biogas residue carbon activator can be fully contacted with the sewage containing organic pollutants and persulfate for adsorption and degradation.

[0035] According to the present invention, preferably, the conditions for the mixing include: the temperature is 20 - 30 °C, specifically it can be 20 °C, 22 °C, 24 °C, 26 °C, 28 °C, 30 °C, or any value between these values; the time is 4 - 5 h, specifically it can be 4 h, 4.2 h, 4.4 h, 4.6 h, 5 h, or any value between these values; the pH is 2 - 6, specifically it can be 2, 3, 4, 5, 6, or any value between these values; and shaking on a shaker. The inventors have found through research that by adopting the above preferred implementation mode, the reaction between the biogas residue carbon activator and the sewage containing organic pollutants and persulfate can be more sufficient and efficient.

[0036] According to the present invention, preferably, the persulfate is selected from at least one of sodium persulfate, potassium persulfate, potassium peroxymonosulfate, and ammonium persulfate. Preferably, relative to 1 g of the substance containing organic pollution, the dosage of the biogas residue carbon activator is 15 - 20 g; the dosage of the persulfate is 1.19 - 2.38 g. Preferably, the content of the organic pollutants is 45 - 55 mg / L; the concentration of the persulfate is 5 - 15 mM. The inventors have found through research that by adopting the above preferred implementation mode, the activation efficiency of the biogas residue carbon activator on the persulfate can be further improved, and the effect of the persulfate in degrading organic pollutants in sewage can be enhanced.

[0037] The method provided above can significantly improve the adsorption and degradation effects of the biogas residue carbon activator and persulfate on organic pollutants in sewage.

[0038] Preparation of rhodamine B solution:

[0039] Take rhodamine B dye to prepare a solution with a concentration of 50 mg / L: Use an analytical balance to accurately weigh 0.25 g of the solid powder of rhodamine B dye and fully dissolve it in a beaker, and make up the volume to a 50 mL volumetric flask to obtain a standard stock solution of 5 g / L rhodamine B dye. Use a pipette to transfer 10 mL of the stock solution into a 1000 mL volumetric flask, and then make up the volume to the mark with deionized water to obtain a 50 mg / L rhodamine B solution.

[0040] Preparation of the standard curve of rhodamine B solution

[0041] Prepare a Rhodamine B standard solution by dissolving Rhodamine B, with a concentration of 50 mg / L. Take 5 10-mL colorimetric tubes and prepare Rhodamine B solution standard solutions with different concentration gradients (0.2 mg / L, 0.4 mg / L, 0.6 mg / L, 0.8 mg / L, 1.0 mg / L). Finally, add deionized water to the mark. Then shake well and develop color for 15 minutes, and measure the absorbance with a spectrophotometer.

[0042] Measure the absorbance values of the 5 colorimetric tubes at a wavelength of 554 nm.

[0043] Draw a curve of the absorbance value against the Rhodamine B content (mg / L) to obtain the Rhodamine B standard curve. As Figure 1 shown.

[0044] The regression equation of the calibration curve is y = 0.0323x + 0.00787, R 2 = 0.999

[0045] Polypropylene is a waste polypropylene packaging bag with a molecular weight of 100000 Mw.

[0046] In the following examples, the biogas residue was purchased from Anhui Haoyue Environmental Technology Co., Ltd. The rest of the reagents and raw materials are all conventional commercially available products.

[0047] Example 1-1

[0048] Mix the biogas residue and polypropylene in a porcelain mortar at a mass ratio of 1:1 to obtain a mixture; transfer all the mixture to an ash dish, and then increase the temperature from room temperature to 600 °C at a heating rate of 10 °C / min in a tube furnace and hold for 2 h. The obtained biogas residue carbon activator is denoted as BC 1.

[0049] Example 1-2

[0050] Mix the biogas residue and polypropylene fragments in a porcelain mortar at a mass ratio of 1:0.5 to obtain a mixture; transfer all the mixture to an ash dish, and then increase the temperature from room temperature to 600 °C at a heating rate of 5 °C / min in a tube furnace and hold for 2 h. The obtained biogas residue carbon activator is denoted as BC 2.

[0051] Example 1-3

[0052] Mix the biogas residue and polypropylene fragments in a porcelain mortar at a mass ratio of 1:0.8 to obtain a mixture; transfer all the mixture to an ash dish, and then increase the temperature from room temperature to 700 °C at a heating rate of 15 °C / min in a tube furnace and hold for 3 h. The obtained biogas residue carbon activator is denoted as BC 3.

[0053] Example 1-4

[0054] Mix the biogas residue and polypropylene in a porcelain mortar at a mass ratio of 1:1 to obtain a mixture; transfer all of the mixture to a crucible, and then increase the temperature from room temperature to 700 °C at a heating rate of 10 °C / min in a tube furnace and hold for 2 h. The obtained biogas residue carbon activator is denoted as BC 4.

[0055] Examples 1-5

[0056] Mix the biogas residue and polypropylene in a porcelain mortar at a mass ratio of 1:0.2 to obtain a mixture; transfer all of the mixture to a crucible, and then increase the temperature from room temperature to 600 °C at a heating rate of 10 °C / min in a tube furnace and hold for 2 h. The obtained biogas residue carbon activator is denoted as BC 5.

[0057] Examples 1-6

[0058] Prepare the biogas residue carbon activator according to the method described in Example 1-1, except that polypropylene is adjusted to polyethylene. The obtained biogas residue carbon activator is denoted as BC 6.

[0059] Comparative Example 1

[0060] Prepare the biogas residue carbon activator according to the method described in Example 1-1, except that polypropylene is not added. The obtained biogas residue carbon activator is denoted as BC A.

[0061] Example 2-1

[0062] Take the biogas residue carbon activator BC 1 obtained by the preparation method of Example 1-1 above, mix it with 100 mL of rhodamine B solution with a concentration of 50 mg / L. The addition amount of the biogas residue carbon activator per 100 mL of rhodamine B solution is 125 mg, the concentration of sodium persulfate is 10 mM, the pH is 6, and the mixing temperature is 25 °C. Shake it on a shaker. After 4 h, the reaction ends. The obtained adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0063] Example 2-2

[0064] Take the biogas residue carbon activator BC 2 obtained by the preparation method of Example 1-2 above, mix it with 100 mL of rhodamine B solution with a concentration of 55 mg / L. The addition amount of the biogas residue carbon activator per 100 mL of rhodamine B solution is 75 mg, the concentration of sodium persulfate is 5 mM, the pH is 2, and the mixing temperature is 25 °C. Shake it on a shaker. After 4 h, the reaction ends. The obtained adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0065] Example 2-3

[0066] Take the biogas residue carbon activator BC 3 obtained by the preparation method of the above Examples 1-3, mix it with 100 mL of rhodamine B solution with a concentration of 45 mg / L. The addition amount of the biogas residue carbon activator per 100 mL of rhodamine B solution is 115 mg, the concentration of sodium persulfate is 20 mM, the pH is 4, the mixing temperature is 25 °C, shake it on a shaker, and the reaction ends after 4 h. The adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0067] Examples 2-4

[0068] Take the biogas residue carbon activator BC 4 obtained by the preparation method of the above Examples 1-4, mix it with 100 mL of rhodamine B solution with a concentration of 50 mg / L. The addition amount of the biogas residue carbon activator per 100 mL of rhodamine B solution is 50 mg, the concentration of sodium persulfate is 10 mM, the pH is 6, the mixing temperature is 25 °C, shake it on a shaker, and the reaction ends after 4 h. The adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0069] Examples 2-5

[0070] Carry out the adsorption and degradation reactions according to the method of Example 2-1, except that the addition amount of the biogas residue carbon activator is 75 mg, the concentration of sodium persulfate is 10 mM, and the pH is 6. The adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0071] Examples 2-6

[0072] Carry out the adsorption and degradation reactions according to the method of Example 2-1, except that the biogas residue carbon activator BC 1 prepared in Example 1-1 is replaced with the biogas residue carbon BC 5 prepared in Laboratory 1-5. The adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0073] Examples 2-7

[0074] Carry out the adsorption and degradation reactions according to the method of Example 2-2, except that the biogas residue carbon activator BC 1 prepared in Example 1-1 is replaced with the biogas residue carbon BC 6 prepared in Laboratory 1-6. The adsorbed rhodamine B solution is filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate is collected.

[0075] Examples 2-8

[0076] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the addition amount of the biogas residue carbon activator was 75 mg, the concentration of sodium persulfate was 5 mM, and the pH was 10. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0077] Example 2-9

[0078] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the addition amount of the biogas residue carbon activator was 25 mg. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0079] Example 2-10

[0080] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the addition amount of the biogas residue carbon activator was 50 mg. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0081] Example 2-11

[0082] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the addition amount of the biogas residue carbon activator was 100 mg. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0083] Example 2-12

[0084] The adsorption and degradation reactions were carried out according to the method of Example 2-5, except that the concentration of sodium persulfate was 1 mM. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0085] Example 2-13

[0086] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the pH was 10. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0087] Example 2-14

[0088] The adsorption and degradation reactions were carried out according to the method of Example 2-5, except that the concentration of sodium persulfate was 15 mM. The adsorbed Rhodamine B solution was filtered through a pinhole filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0089] Example 2-15

[0090] The adsorption and degradation reactions were carried out according to the method of Example 2-5, except that the concentration of sodium persulfate was 20 mM. The adsorbed rhodamine B solution was filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0091] Example 2-16

[0092] The adsorption and degradation reactions were carried out according to the method of Example 2-8, except that the pH was 2. The adsorbed rhodamine B solution was filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0093] Example 2-17

[0094] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the pH was 4. The adsorbed rhodamine B solution was filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0095] Example 2-18

[0096] The adsorption and degradation reactions were carried out according to the method of Example 2-1, except that the pH was 12. The adsorbed rhodamine B solution was filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0097] Comparative Example 2

[0098] The adsorption reaction was carried out according to the method of Example 2-1, except that the biogas residue carbon activator BC 1 obtained by the preparation method of Example 1-1 was replaced with the biogas residue carbon activator BC A obtained by the preparation method of Comparative Example 1. The adsorbed rhodamine B solution was filtered through a syringe filter with a pore size of 0.45 μm to obtain a filtrate, and the filtrate was collected.

[0099] Test Example 1

[0100] Using a pipette, 1 mL of the filtrate obtained in Example 2-1, Example 2-4 to Example 2-8, Example 2-19 and Comparative Example 2 above was taken and placed in a 10 mL colorimetric tube. The absorbance was measured with a spectrophotometer. According to Figure 1 the standard curve shown, the content of rhodamine B was obtained, and then the removal rate of rhodamine B was calculated. The analysis results are shown in Table 1;

[0101] Table 1

[0102] Number Removal Rate (%) Example 2-1 100 Example 2-4 96.77 Example 2-5 95.47 Example 2-6 72.19 Example 2-7 76.71 Example 2-8 84.30 Example 2-9 77.85 Example 2-10 81.83 Example 2-11 99.39 Example 2-12 85.59 Example 2-13 94.19 Example 2-14 98.21 Example 2-15 98.49 Example 2-16 99.99 Example 2-17 94.79 Example 2-18 73.61 Comparative Example 2 68.21

[0103] As can be seen from Table 1, the removal rate of Rhodamine B in the Rhodamine B solution by the biogas residue carbon activator prepared in the examples is significantly higher than that of the biogas residue carbon activator prepared in the comparative examples. Therefore, the biogas residue carbon activator prepared by the method provided by the present invention has a better adsorption function for organic pollutants in sewage and a better activation effect on persulfate.

[0104] Test Example 2

[0105] The adsorption and degradation reactions were carried out according to the method of Example 2-1. After the reaction, the biogas residue carbon activator was recycled and regenerated, and then the Rhodamine B solution and sodium persulfate solution with the same concentration and volume were added again for adsorption and degradation reactions. This cycle was repeated five times, and the removal rate of Rhodamine B in the filtrate obtained from each reaction was measured. The data obtained are shown in Table 2.

[0106] Table 2

[0107] Number Removal Rate (%) First time 100 Second time 99.73 Third time 99.37 Fourth time 99.13 Fifth time 99.01

[0108] As can be seen from Table 2, with each adsorption reaction, the removal rate of Rhodamine B decreased slightly, and each decrease was within 0.4%. Therefore, the biogas residue carbon activator prepared by the present invention has high cycle stability and great industrial development prospects.

[0109] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A method for preparing a biogas residue charcoal activator, characterized in that: The preparation method comprises: mixing biogas residue and plastic and then roasting and carbonizing them.

2. The preparation method according to claim 1, characterized in that: The plastic is selected from at least one of polyethylene, polypropylene and polystyrene; Preferably, the plastic is polypropylene.

3. The preparation method according to claim 1, characterized in that: The mass ratio of the biogas residue to the plastic is 1:0.5-1.

4. The preparation method according to claim 1, characterized in that: The conditions of the carbonization reaction include: a calcination temperature of 600-700°C, a calcination time of 2-3h, and a heating rate of 5-15°C / min.

5. A biogas residue charcoal activator, characterized in that: The biogas residue charcoal activator is prepared by the preparation method described in any one of claims 1 to 4.

6. Use of the biogas residue charcoal activator according to claim 5 in removing organic pollutants in water.

7. The use according to claim 6, characterized in that: The organic pollutant is selected from at least one of rhodamine B, acid orange, methyl orange, malachite green, orange yellow G and bisphenol A; Preferably, the organic pollutant is rhodamine B.

8. A method for removing organic pollutants in water, characterized in that: The method comprises: mixing sewage containing organic pollutants, persulfate and the biogas charcoal activator according to claim 5.

9. The method according to claim 8, characterized in that The mixing conditions include: temperature of 20-30°C, time of 4-5h, pH of 2-6; Preferably, the mixing is carried out in a shaker; Preferably, the amount of the biogas residue charcoal activator is 15-30 g relative to 1 g of the organic pollutants; Preferably, the amount of the persulfate used is 1.19-2.38 g relative to 1 g of the organic pollutant.

10. The method according to claim 8, characterized in that The persulfate is selected from at least one of sodium persulfate, potassium persulfate, potassium hydrogen persulfate and ammonium persulfate; the organic pollutant is selected from at least one of rhodamine B, acid orange, methyl orange, malachite green, orange yellow G and bisphenol A; Preferably, in the sewage containing organic pollutants, the content of the organic pollutants is 45-55 mg / L; Preferably, the concentration of the persulfate is 5-15 mM.

Images