Resource utilization method for preparing heavy metal and dye adsorption material based on fly ash

Abstract

The invention discloses a resource utilization method for preparing a heavy metal and dye adsorption material based on fly ash, and belongs to the field of waste reutilization. The preparation method of the adsorbing material comprises the following steps: pretreating the silicon slag; the method comprises the following steps: heating silicon slag in an acid solution for a first time, cooling, filtering to obtain an insoluble substance, and washing the insoluble substance to be neutral; heating the neutral insoluble substance in a first alkaline aqueous solution for a second time, and centrifuging to obtain silicon slag-based water glass; stirring the silicon slag-based water glass and a second alkaline compound until the second alkaline compound is completely dissolved to obtain an alkali activator; the alkali activator is mixed with fly ash and water to form the foundation polymer type adsorption material. According to the method, low-activity silicon in the silicon slag is converted into high-reaction-activity sodium silicate which participates in the geological polymerization reaction, a new way is provided for resource utilization of the silicon slag, and the method is simple in process, high in production benefit and good in product market prospect.

Description

Technical Field

[0001] The present invention relates to the field of waste reuse, and particularly to a resource utilization method for preparing heavy metal and dye adsorption materials based on fly ash. Background Art

[0003] The adsorption method for treating heavy metal and dye wastewater has the characteristics of low cost, simple operation and high treatment efficiency. For example, Chinese Patent Application CN113526911A discloses a porous fly ash-based geopolymer that can be used for wastewater treatment. Using fly ash as the matrix material and MnO2, H2O2, NaHCO3 and aluminum powder as the compound foaming agent, the required porous geopolymer foam material is prepared by a foaming polymerization reaction. The porous fly ash-based geopolymer foam material described in this application can not only filter impurities in water, but also remove harmful organic substances and heavy metal ions in water, greatly reducing the content of harmful substances in water. It has the advantages of strong water purification ability, fast purification speed and high purification efficiency, and realizes the effective utilization of solid waste fly ash. Another example is Chinese Patent Application CN110590205A, which discloses a method for preparing geopolymers. Fly ash, alkali residue and water are mixed and then sent into a wet ball mill. Then, a grinding aid is added to the wet ball mill for grinding to obtain slurry A. Zeolite powder and water are sent into the wet ball mill for wet grinding to obtain slurry B. Slurry A and slurry B are mixed to obtain a mixed slurry C. Sodium hydroxide and water glass are added to slurry C to obtain a fly ash geopolymer solid-liquid mixed slurry. This application solves the problem of the harm of chloride ions in alkali residue in the traditional process, reduces the dosage of strong alkali, alleviates the efflorescence phenomenon, does not affect the performance of water reducing agents, and the working performance is adjustable; the prepared concrete products are superior to the geopolymers prepared by the traditional process in terms of strength, durability, etc.

[0004] It can be seen that there are a large number of examples in the prior art of using industrial wastes such as fly ash to prepare geopolymers. However, with the continuous emergence and development of new technologies, the emergence of new industrial wastes also brings new challenges. As a solid waste in the production process of polysilicon, silicon slag contains a large amount of silicon powder, metal chlorides, a small amount of hydrogen chloride and chlorosilane. At present, through literature retrieval, there is a lack of relevant technologies for its comprehensive treatment, and there is an urgent need to develop a new method for synthesizing geopolymers to solve related problems. Summary of the Invention

[0005] The main object of the present invention is to provide a heavy metal and dye adsorption material prepared from fly ash, a preparation method and uses, in order to at least partially solve the above technical problems.

[0006] To achieve the above object, as the first aspect of the present invention, a preparation method of an adsorption material is proposed, including the following steps:

[0007] Pretreat the silicon slag;

[0008] Place the silicon slag in an acid solution and heat for a first period of time. After cooling, filter to obtain an insoluble substance, and wash the insoluble substance until it is neutral;

[0009] Place the above-mentioned neutral insoluble substance in a first alkaline aqueous solution and heat for a second period of time, and centrifuge to obtain a sodium silicate-based material from the silicon slag;

[0010] Stir the sodium silicate-based material from the silicon slag and a second alkaline compound until the second alkaline compound is completely dissolved to obtain an alkali activator;

[0011] Mix the alkali activator with fly ash and water to form a geopolymer-based adsorbent material for the foundation.

[0012] As a second aspect of the present invention, a geopolymer-based adsorbent material for the foundation prepared by the preparation method as described above is also proposed.

[0013] As a third aspect of the present invention, the use of the geopolymer-based adsorbent material for the foundation as described above in treating heavy metals and dyes in sewage is also proposed.

[0014] Based on the above technical solutions, the heavy metal and dye adsorbent material prepared from fly ash of the present invention, the preparation method and the use thereof have at least one of the following beneficial effects compared with the prior art:

[0015] 1. Convert the low-reactivity silicon in the silicon slag into highly reactive sodium silicate, which participates in the geopolymerization reaction, providing a new way for the resource utilization of the silicon slag;

[0016] 2. Through the recycling of silicon slag, fly ash and rice husk ash, solid waste treatment is realized, the raw material cost is significantly reduced, and an economical fly ash geopolymer adsorbent material is obtained, providing an innovative idea for the development of high-efficiency sewage pollution treatment materials;

[0017] 3. Convert low-value industrial solid wastes such as silicon slag and fly ash and agricultural solid waste rice husk ash into high-value sewage treatment adsorbents. The preparation process is simple, the production efficiency is high, and the product has a good market prospect. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the present invention, the following will briefly introduce each drawing:

[0019] Figure 1 (a) is the X-ray diffraction (XRD) pattern of rice husk ash-fly ash geopolymer (RFG); Figure 1 (b) is the FTIR (Fourier transform infrared spectrum) of RFG;

[0020] Figure 2 is the BET data analysis chart of RFG;

[0021] Figure 3 (a) Effect of pH value of MB solution on adsorption capacity and removal rate; Figure 3 (b) Effect of adsorbent dosage on adsorption capacity and removal rate; Figure 3 (c) Effect of adsorption time on adsorption capacity and removal rate; Figure 3 (d) Effect of initial concentration of MB solution on adsorption capacity and removal rate; Figure 3 (e) Kinetic model of RFG; Figure 3 (f) Langmuir isothermal adsorption model of RFG; Figure 3 (g) Freundlich isothermal adsorption model of RFG; Figure 3 (h) Effect of number of cycles of RFG on adsorption capacity and removal rate; Figure 3 (i) Effect of coexisting ion concentration on adsorption capacity and removal rate;

[0022] Figure 4 (a) Effect of adsorption time on adsorption capacity and removal rate; Figure 4 (b) Effect of pH value of Cu(Ⅱ) solution on adsorption capacity and removal rate; Figure 4 (c) Effect of adsorbent dosage on adsorption capacity and removal rate; Figure 4 (d) Effect of initial concentration of Cu(Ⅱ) solution on adsorption capacity and removal rate; Figure 4 (e) Kinetic model of RFG; Figure 4 (f) Isothermal adsorption model of RFG;

[0023] Figure 5 Schematic diagram of the adsorption of methylene blue dye by rice husk ash-fly ash geopolymer (RFG) adsorbent. Detailed implementation manners

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0025] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] In the description of the embodiments of the present invention, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In the embodiments of the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of different embodiments or examples.

[0027] The present invention is proposed in view of the health hazards caused by the large amount of emissions of heavy metals and dyes at present. Among them, using the silicon slag, which is a solid waste in the production process of polysilicon, combining the silicon powder in the silicon slag, the fly ash generated by thermal power generation and the rice husk ash, a high-value-added adsorbent for heavy metal and dye wastewater is prepared, creating a new method for recycling and reusing silicon slag, fly ash and rice husk ash.

[0028] The inventor of the present invention has discovered through painstaking research that recycling the silicon powder in the silicon slag to make water glass and activating the silicon and aluminum components in the fly ash and rice husk ash components to prepare geopolymers can be used to adsorb metals such as copper, manganese and methylene blue in wastewater, and the effect is better than that of conventional geopolymers on the market. The -OH, Si-OH and Al-OH on the surface of the adsorbent provide rich sites for the adsorption of Cu 2+ The negative charge on the surface of the adsorbent and the Ca 2+ and Na + participating in ion exchange in the gel contribute to the adsorption of methylene blue and Cu 2+ .

[0029] Specifically, the present invention provides a preparation method of an adsorbent material, including the following steps:

[0030] Pretreat the silicon slag;

[0031] Place the silicon slag in an acid solution and heat for the first time, filter to obtain insoluble matter after cooling, and wash the insoluble matter to neutral;

[0032] Place the above neutral insoluble matter in a first alkaline aqueous solution and heat for the second time, and centrifuge to obtain silicon slag-based water glass;

[0033] Stir the silicon slag-based water glass with a second alkaline compound until the second alkaline compound is completely dissolved to obtain an alkali activator;

[0034] Mix the alkali activator with fly ash and water to form a geopolymer-type adsorbent material.

[0035] Compared with the prior art, the preparation method of the present invention directly makes slag into an alkali activator without the need to additionally add an alkali activator. And during the production process, since the slag contains strong acid and volatile gases, the present invention can avoid accidents caused by uncleaned dangerous components when directly adding it as a filler to geopolymers.

[0036] Wherein, the pretreatment step includes: removing volatile gases, adjusting the chloride ion concentration, and / or drying treatment.

[0037] Wherein, the step of removing volatile gases, for example, includes: crushing the slag, vibrating or turning it by using a vibrating screen, a stirring kettle, etc., and drawing away the air above the slag by using an axial flow fan or an air extractor with a filter screen.

[0038] Wherein, the acid solution is, for example, hydrochloric acid, sulfuric acid, nitric acid or their solutions.

[0039] Wherein, in the step of heating for the first time, the heating temperature is 40 - 60 °C and the first time is 5 - 6 hours.

[0040] Wherein, in the step of filtering to obtain insoluble substances after cooling, the cooling step adopts natural cooling, and the filtering step adopts normal pressure or vacuum filtration.

[0041] Wherein, the first alkaline aqueous solution is an aqueous solution of sodium hydroxide or potassium hydroxide. In the step of heating for the second time, the heating temperature is 40 - 60 °C and the second time is 2 - 4 hours, preferably 3 hours.

[0042] Wherein, the second alkaline compound is sodium hydroxide or potassium hydroxide.

[0043] Wherein, the alkali activator is placed for 12 - 24 hours before being mixed with fly ash.

[0044] Wherein, rice husk ash is also added to the mixing ratio of the alkali activator and fly ash.

[0045] Wherein, after the alkali activator, fly ash, and rice husk ash are mixed evenly, they are transferred to a mold and placed in an oven at 55 - 60 °C for drying for 24 - 36 hours.

[0046] As a preferred embodiment, in the above steps of adding acid and adding alkali, in order to avoid accidents caused by too violent reaction of the slag, the following treatment method can be adopted:

[0047] After the slag is pretreated, the slag is mixed with hydrochloric acid in a ratio, ultrasonically treated for a set time at a set temperature, and metal impurities are selectively dissolved and removed;

[0048] Add a preset proportion of H2O2 solution to the pickled silicon slag and stir at 50 - 60 °C for 0.5 - 1.5 h;

[0049] Mix the oxidized silicon slag with sodium hydroxide in proportion, add water, and carry out microwave-assisted reaction at 80 °C for 1 - 2 h;

[0050] After injecting the geopolymer slurry obtained thereby into a mold, cure it in stages:

[0051] The first stage: hydrothermal curing at 60 °C for 12 h;

[0052] The second stage: dry heat curing at 90 °C for 24 h.

[0053] More preferably, for example, it can be carried out as follows:

[0054] Mix the silicon slag with hydrochloric acid in proportion, perform ultrasonic treatment at a set temperature for a set time, and selectively dissolve and remove metal impurities.

[0055] Add 0.15 g of H2O2 solution to the pickled silicon slag and stir at 60 °C for 1 h to oxidize and remove residual organic pollutants and improve the reaction activity of elemental silicon.

[0056] Mix the oxidized silicon slag with NaOH flakes in proportion, add distilled water, and carry out microwave-assisted reaction (power 800 W) at 80 °C for 2 h to accelerate the dissolution of silicate.

[0057] After injecting the geopolymer slurry into a mold, cure it in stages:

[0058] The first stage is, for example: hydrothermal curing at 60 °C for 12 h to promote the dissolution of aluminosilicate;

[0059] The second stage is, for example: dry heat curing at 90 °C for 24 h to accelerate the formation of a three-dimensional network structure.

[0060] In the above steps, the silicon slag from which the irritating gas has been removed can react with alkali and water to produce hydrogen. The hydrogen produced can be used as a foaming agent to synthesize geopolymer foam. The geopolymer foam obtained thereby can be used as building materials such as thermal insulation, adsorption, and heat insulation.

[0061] The present invention also provides a ground polymer type adsorption material prepared according to the preparation method as described above.

[0062] The geopolymer-based adsorbent material can be, for example, sheet-shaped, block-shaped, granular, etc. Preferably, it is shaped into a block with a concave-convex fitting structure through a set mold, and can be positioned through the concave-convex structure during use. In addition, the block-shaped adsorbent material preferably has electrodes and gas / liquid transport pipelines buried inside, which can generate an electric field when powered on to accelerate the adsorption of heavy ions in water. After the adsorption is completed, gas or liquid can be reversely transported through the gas / liquid transport pipeline to dredge the gas channel and desorb the adsorbed ions, thereby regenerating the adsorbent material.

[0063] The present invention will be further described and illustrated below through specific embodiments. It should be noted that the following embodiments are only for illustration and not for limiting the present invention. Based on the embodiments shown below of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the embodiments of the present invention.

[0064] Example 1

[0065] (1) Preparation method

[0066] ① Preparation of silica fume-based sodium silicate

[0067] The silica fume obtained from the enterprise is placed open in a fume hood for 7 days to remove most of the irritating gases therein, such as chlorosilane. Then it is placed in an oven at 100 °C for 3 days to remove the remaining irritating gases. Weigh 30 g of the dried silica fume into a 500 ml acid-resistant glass reaction kettle, and add 600 ml of 2M HCl solution. Place the conical flask on a magnetic stirrer, heat to 50 °C and stir for 6 hours. Wait for the solution in the conical flask to cool naturally to room temperature, filter through suction filtration, collect the insoluble matter and wash it with a large amount of distilled water until neutral. The pickled silica fume can be obtained. Weigh a certain amount of sodium hydroxide tablets into a 500 ml acid-resistant glass reaction kettle, add a certain amount of distilled water, and the pickled silica fume. Place the conical flask on a magnetic stirrer, heat to 50 °C, and stir for 3 hours. Then centrifuge at 10000 rpm to obtain light yellow silica fume-based sodium silicate.

[0068] ② Preparation of rice husk ash-fly ash geopolymer (RFG) adsorbent

[0069] Weigh a certain amount of sodium hydroxide tablets and silica fume-based sodium silicate, stir until the sodium hydroxide is completely dissolved to obtain an alkali activator, and it can be used after standing for 12 hours. Weigh 30 g of fly ash, a certain amount of rice husk ash and distilled water, add them to the alkali activator, mix with mechanical stirring for 10 min, and transfer to a mold. Place it in an oven at 60 °C for 24 hours. Then grind and sieve to obtain a rice husk ash-fly ash-based geopolymer powder adsorbent.

[0070] Examples 2 - 10

[0071] The specific solution is the same as that of Example 1, and the difference lies only in the changes of some parameters shown in Table 1 below.

[0072] Table 1 List of various parameters of Examples 1-10

[0073]

[0074]

[0075] To explore the reaction mechanism, XRD, FTIR and adsorption mass detection were carried out on the final product of Example 1 above, and the specific results are as follows:

[0076] (1) Characterization of rice husk ash-fly ash geopolymer (RFG) adsorbent

[0077] From Figure 1 (a), it can be observed that under the excitation of silica fume-based sodium silicate and sodium hydroxide, fly ash and rice husk ash successfully underwent a geopolymerization reaction to form calcium silicate hydrate gel. This indicates that silica fume sodium silicate can replace industrial sodium silicate in the geopolymerization reaction. In Figure 1 (b), it can also be seen that there is a characteristic peak of asymmetric stretching vibration of Si-O-Si or Si-O-Al at 1026 cm -1 , indicating the successful formation of geopolymer gel.

[0078] (2) Adsorption of heavy metals by rice husk ash-fly ash geopolymer (RFG) adsorbent

[0079] Figure 3 (a) shows the effect of the pH value of the MB solution on the adsorption capacity and removal rate; Figure 3 (b) shows the effect of the adsorbent dosage on the adsorption capacity and removal rate; Figure 3 (c) shows the effect of the adsorption time on the adsorption capacity and removal rate; Figure 3 (d) shows the effect of the initial concentration of the MB solution on the adsorption capacity and removal rate; Figure 3 (e) is the kinetic model of RFG; Figure 3 (f) is the Langmuir isothermal adsorption model of RFG; Figure 3 (g) is the Freundlich isothermal adsorption model of RFG; Figure 3 (h) shows the effect of the number of cycles of RFG on the adsorption capacity and removal rate; Figure 3 (i) shows the effect of the coexisting ion concentration on the adsorption capacity and removal rate.

[0080] From Figure 3 (b), it can be seen that in Cu 2+Under the conditions of a concentration of 13 mg / L, an adsorbent dosage of 0.05 g, and a solution volume of 50 ml, the adsorption capacity and removal rate of RFG for Cu(II) increase with the increase of pH value. When pH is greater than 4, the adsorption capacity and removal rate of RFG for Cu(II) tend to be stable. This is because, at lower pH, the H + and H3O + concentrations in the solution are relatively high, which will compete with Cu 2+ for the adsorption sites on the surface of RFG, and it is not conducive to the adsorption of Cu 2+ by RFG. Figure 3 (a) shows that under the condition of pH = 5, the removal rate of RFG increases with the increase of the adsorbent dosage, while the adsorption capacity gradually decreases. When the adsorbent dosage is greater than 0.0375 g, the growth rate of the removal rate decreases. This is because with the increase of the adsorbent dosage, the available adsorption sites increase, but the concentration of Cu 2+ remains unchanged, resulting in more and more adsorption sites not being utilized. Considering the adsorption effect comprehensively, an adsorbent dosage of 0.0375 g is selected.

[0081] Figure 3 (f) and Figure 3 (g) are the isothermal adsorption models of RFG. The adsorption behavior of RFG for Cu 2+ is in good agreement with both the Langmuir and Freundlich models. By comparing the Qmax after fitting (measured value Qe = 21.08 mg / g, Langmuir Qmax = 22.06 mg / g, Freundlich Qmax = 19.62 mg / g), it is concluded that the adsorption behavior of RFG for Cu 2+ is more in line with the Langmuir model. This indicates that the adsorption behavior of RFG for Cu 2+ is a monolayer adsorption. Figure 3 (e) is the kinetic model of RFG. The adsorption of RFG for Cu 2+ conforms to the pseudo-second-order kinetic model (FSO).

[0082] Table 2 Kinetic parameters of RFG

[0083]

[0084] Table 3 Langmuir and Freundlich model parameters for RFG to adsorb MB

[0085]

[0086] (3) Adsorption of methylene blue dye by rice husk ash-fly ash geopolymer (RFG) adsorbent

[0087] Figure 4(a) Influence of adsorption time on adsorption capacity and removal rate; Figure 4 (b) Influence of pH value of Cu(Ⅱ) solution on adsorption capacity and removal rate; Figure 4 (c) Influence of adsorbent dosage on adsorption capacity and removal rate; Figure 4 (d) Influence of initial concentration of Cu(Ⅱ) solution on adsorption capacity and removal rate; Figure 4 (e) Kinetic model of RFG; Figure 4 (f) Isothermal adsorption model of RFG.

[0088] pH value has a great influence on the adsorption of methylene blue in aqueous solution by geopolymer powder adsorbent. The higher the pH value, the better the adsorption effect. Methylene blue is a cationic dye. When the pH of the solution is low, higher concentrations of H + and H3O + in the solution may compete with methylene blue for adsorption. The optimal adsorption pH is 6. The influence of adsorbent dosage and initial concentration of MB solution on adsorption capacity was also investigated. The adsorption capacity of MB decreases with the increase of adsorbent dosage, but the removal rate of MB increases. The adsorbent dosage with relatively high adsorption capacity and removal rate of MB was selected as the optimal adsorbent dosage (0.05 g / 50 ml). The adsorption capacity increases with the increase of the initial concentration of MB.

[0089] The adsorption kinetics and isothermal adsorption model of methylene blue in aqueous solution by geopolymer powder adsorbent were fitted and analyzed. The results show that the adsorption kinetics conforms to the pseudo-first-order kinetic model, that is, the adsorption process is mainly physical adsorption. The Langmuir and Freundlich models were used for isothermal adsorption study. The results show that it is more in line with the Langmuir model, indicating that the adsorption process is mainly monolayer adsorption. At the same time, the maximum adsorption capacity calculated by the Langmuir model is 84.8 mg / g, which is very close to the experimental value of 85.2 mg / g.

[0090] Table 4 Kinetic parameters of RFG

[0091]

[0092] Table 5 Langmuir and Freundlich model parameters for RFG adsorption of Cu(II)

[0093]

[0094] The above is only the preferred embodiment of the embodiments of the present invention, and it is not intended to limit the embodiments of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of the present invention shall be included within the scope of protection of the embodiments of the present invention.

Claims

1. A method for preparing an adsorbent material, characterized in that: The steps include: Pre-treating silicon slag; The silicon slag is placed in an acid solution and heated for a first time, and after cooling, an insoluble matter is filtered out, and the insoluble matter is washed to neutrality; placing the neutral insoluble matter in a first alkaline aqueous solution and heating it for a second time, and centrifuging to obtain silicon slag-based water glass; Stirring the silicon slag-based water glass and a second alkaline compound until the second alkaline compound is completely dissolved to obtain an alkaline activator; The base activator is mixed with fly ash and water to form a ground-based polymer type adsorbent material.

2. The preparation method according to claim 1, characterized in that: The pretreatment step includes: removing volatile gases, adjusting chloride ion concentration and / or drying; and / or The acid solution is hydrochloric acid, sulfuric acid, nitric acid or a solution thereof; and / or In the step of heating for the first time, the heating temperature is 40-60° C. and the first time is 5-6 hours.

3. The preparation method according to claim 1, characterized in that: In the step of filtering out the insoluble matter after cooling, the cooling step adopts natural cooling, and the filtering step adopts normal pressure or vacuum filtration.

4. The preparation method according to claim 1, characterized in that: The first alkaline aqueous solution is sodium hydroxide or potassium hydroxide aqueous solution; and / or In the step of heating for a second time, the heating temperature is 40-60° C., the second time is 2-4 hours, preferably 3 hours; and / or The second alkaline compound is sodium hydroxide or potassium hydroxide.

5. The preparation method according to claim 1, characterized in that: The alkali activator is allowed to stand for 12-24 hours before being mixed with the fly ash; and / or When the alkali activator is mixed with fly ash, rice husk ash is also added.

6. The preparation method according to claim 1, characterized in that: After the silicon slag is pretreated, the silicon slag is mixed with hydrochloric acid in proportion, and ultrasonically treated at a set temperature for a set time to selectively dissolve and remove metal impurities; Add a preset proportion of H2O2 solution to the pickled silicon slag and stir at 50-60°C for 0.5-1.5h; The oxidized silicon slag and sodium hydroxide were mixed in proportion, water was added, and the mixture was subjected to microwave-assisted reaction at 80°C for 1-2h; The resulting geopolymer slurry is injected into the mold and cured in stages: Stage 1: 60℃ wet heat curing for 12h; The second stage: dry heat curing at 90℃ for 24h.

7. The preparation method according to claim 1, characterized in that: The alkali activator is uniformly mixed with fly ash and rice husk ash, and then transferred into a mold and placed in an oven at 55-60° C. to dry for 24-36 hours.

8. The preparation method according to claim 7, characterized in that: The ground-based polymer type adsorption material to be prepared is shaped into a block with a concave-convex matching structure through a set mold, and electrodes and gas / liquid conveying pipelines are buried inside the block-shaped ground-based polymer type adsorption material.

9. A ground-based polymer adsorption material prepared according to the preparation method according to any one of claims 1 to 8.

10. Use of the ground-based polymer adsorbent material according to claim 9 in treating heavy metals and dyes in sewage.

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