A copper anode mud CO2 electrocatalytic material and its preparation method

Abstract

This invention proposes a CO2 electrocatalytic material made from copper anode mud and its preparation method, belonging to the field of solid waste resource utilization and carbon emission reduction technology. The raw materials for the CO2 electrocatalytic material made from copper anode mud include copper anode mud, a leaching agent, a metal ion stabilizer, a carbon-containing support, a solid acid additive, and a reducing agent. The copper anode mud is oxidatively leached using the leaching agent to obtain a leachate containing metal components. Then, the metal ion stabilizer, carbon-containing support, solid acid additive, and reducing agent are added to the leachate. After stirring, the mixture is centrifuged, washed, and vacuum dried to obtain the CO2 electrocatalytic material made from copper anode mud. This invention enables the high-value utilization of copper anode mud solid waste. Simultaneously, the prepared CO2 electrocatalytic material can be widely used for carbon emission reduction in industrial flue gas. Compared with traditional methods, it significantly reduces the preparation cost of the catalytic material. Furthermore, by introducing a carbon-containing support and a solid acid additive to enhance electrocatalytic performance, it has significant advantages in both environmental protection and economic aspects.

Description

Technical Field

[0001] This invention belongs to the field of solid waste resource utilization and carbon emission reduction technology, and particularly relates to a copper anode mud CO2 electrocatalytic material and its preparation method. Background Technology

[0002] CO2 electrocatalytic conversion is an important technology for realizing the high-value utilization of CO2. Electrocatalytic materials are the core of this technology. Traditional electrocatalytic materials are generally prepared using chemical reagents as raw materials. Since the elements with CO2 electrocatalytic activity are generally rare and precious metals, the synthesis cost of CO2 electrocatalytic materials remains high. Considering that CO2 emission reduction has become a global consensus, the consumption of rare and precious metal resources by CO2 electrocatalytic technology will increase day by day in the future.

[0003] Copper anode slime is a major type of solid waste generated during copper pyrometallurgical processes. It is rich in elements such as Ag, Cu, Au, Se, and Te. Ag, Cu, Se, and Te have been widely reported to possess CO2 electrocatalytic activity. Therefore, preparing CO2 electrocatalytic materials from anode slime is feasible from the perspective of elemental balance in chemical reactions; however, no relevant patent reports have been found. Preparing high-end electrocatalytic materials from anode slime can significantly improve the resource utilization benefits of solid waste. Currently, the precious metal elements in anode slime are mostly recovered as high-purity elemental metals. While this has some added value, the value of bulk industrial products is limited and highly susceptible to market supply and demand.

[0004] CN111438373A discloses a method for preparing copper-silver core-shell bimetallic spherical nanoparticles. The invention uses copper acetylacetone and silver trifluoroacetate as raw materials. The method involves a two-step process: first, heating to prepare a copper core, and then injecting an oleylamine solution of silver organic compounds to react and prepare the material. The reagents used in this invention are expensive, the synthesis process is relatively complex, and the material preparation cost is high.

[0005] CN111748828B discloses a method for recovering copper, silver, selenium, and tellurium by molten salt electrolysis of copper anode mud. This invention prepares the copper anode mud into an electrode through pretreatment, electrolyzes it in molten salt, and then performs post-treatment on the metal obtained by electrochemical deposition to obtain elemental metals such as copper, silver, selenium, and tellurium. The resulting product has a low added value.

[0006] CN116747869A discloses a single-atom catalyst for CO2 reduction based on waste adsorbent and its preparation method. This invention utilizes carbonaceous solid waste that has adsorbed heavy metals from wastewater to prepare a single-atom catalyst for CO2 reduction. In this invention, because the heavy metal content in the wastewater is low and the adsorbent has a limited adsorption capacity for heavy metals, the content of active components in the catalyst is limited, thus restricting the catalytic performance. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a CO2 electrocatalytic material from copper anode mud and its preparation method. The method involves selectively separating and extracting active components such as Cu and Ag from the copper anode mud that exhibit CO2 electrocatalytic reduction properties. A carbon-containing support and solid acid additive are introduced into the leachate to enhance the electrocatalytic performance. The CO2 electrocatalytic material is then prepared through in-situ reduction precipitation, achieving high-value utilization of solid waste. Furthermore, the prepared CO2 electrocatalytic material can be widely used for carbon reduction in industrial flue gas, significantly reducing the preparation cost of the catalytic material compared to traditional methods.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] One of the technical solutions of the present invention:

[0010] A copper anode mud CO2 electrocatalytic material, the raw materials of which include copper anode mud, leaching agent, metal ion stabilizer, carbon-containing support, solid acid additive and reducing agent;

[0011] The ratio of the copper anode mud to the leaching agent is 1g:10mL;

[0012] The ratio of the metal ion stabilizer to the copper anode mud is 10 mL: 1 g;

[0013] The ratio of the reducing agent to the copper anode mud is 25 mL: 2 g;

[0014] The solid acid additive in the copper anode mud CO2 electrocatalytic material has a mass percentage of 20-30%.

[0015] The carbon-containing support comprises 20-30% by mass in the CO2 electrocatalytic material of the copper anode slime.

[0016] Furthermore, the leaching agent includes H2SO4 and an oxidizing agent, wherein the oxidizing agent includes, but is not limited to, one or more of H2O2, KMnO4, HNO3, O2 and O3.

[0017] Furthermore, the H2SO4 concentration in the leaching agent is 1.5 mol / L, and the oxidant concentration is 3 mol / L.

[0018] Furthermore, the metal ion stabilizer includes, but is not limited to, one or more of sodium citrate, polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG).

[0019] Furthermore, the carbon-containing support includes, but is not limited to, one or more of carbon black particles, carbon nanotubes, and graphene.

[0020] Furthermore, the solid acid additive includes, but is not limited to, one or more of molecular sieves, CeO2, TiO2, ZrO2, and WO3.

[0021] Furthermore, the reducing agent includes, but is not limited to, one or more of NaBH4, Zn powder, ascorbic acid, and formaldehyde.

[0022] Furthermore, the concentration of the metal ion stabilizer is 150 mmol·L⁻¹. -1 The concentration of the reducing agent is 150 mmol·L⁻¹. -1 .

[0023] The second technical solution of the present invention:

[0024] A method for preparing a copper anode mud CO2 electrocatalytic material involves oxidizing and leaching the copper anode mud with a leaching agent to obtain a leachate containing metal components. Then, a metal ion stabilizer, a carbon-containing support, a solid acid additive, and a reducing agent are added to the leachate. After stirring, the mixture is centrifuged, washed, and vacuum dried to obtain the copper anode mud CO2 electrocatalytic material.

[0025] This invention involves oxidative leaching of copper anode mud to transfer metal components into the leachate. The leaching rate of metal elements is enhanced by adding a leaching agent containing an oxidant. Metal elements with CO2 electrocatalytic activity, such as Ag and Cu, in the leachate are selectively extracted. Then, the electrocatalytic performance of the material is enhanced by adding a carbon-containing support and a solid acid additive to the system. Finally, a reducing agent is introduced into the system to prepare CO2 electrocatalytic materials through in-situ reduction precipitation.

[0026] Furthermore, the reducing agent is added at a rate of 3-4 drops per second, and the stirring temperature is 18-30°C. By controlling the reduction rate and temperature during the addition of the reducing agent, catalyst agglomeration into large particles is prevented.

[0027] For example, the preparation method of the copper anode mud CO2 electrocatalytic material of the present invention specifically includes the following steps:

[0028] The metallic elements in the copper anode slime were oxidized and leached using a leaching agent (H2SO4 + oxidant). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of the oxidant was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of copper anode slime was 2 g. This process transferred the metallic components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain a leachate. A carbon-containing support and a solid acid auxiliary were added to the leachate, followed by the rapid addition of 20 mL of a 150 mmol·L⁻¹ acid auxiliary agent. -1 The metal ion stabilizer was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1The reducing agent reduces the metal ions at a dropping rate of 3-4 drops per second. The mixture is rapidly stirred at 18-30°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0029] Furthermore, the vacuum drying temperature is 60°C and the time is 6 hours.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] This invention enables the high-value utilization of copper anode mud solid waste, and the prepared CO2 electrocatalytic material can be widely used for industrial flue gas carbon reduction. Compared with traditional methods, it greatly reduces the preparation cost of catalytic materials. In addition, by introducing carbon-containing supports and solid acid additives to enhance electrocatalytic performance, it has significant advantages in terms of environmental protection and economy. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This is a schematic flowchart of the preparation method of the copper anode mud CO2 electrocatalytic material of the present invention. Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0035] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0036] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0037] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0038] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0039] This invention provides a copper anode mud CO2 electrocatalytic material, the raw materials of which include copper anode mud, leaching agent, metal ion stabilizer, carbon-containing support, solid acid additive and reducing agent;

[0040] The ratio of the copper anode mud to the leaching agent is 1g:10mL;

[0041] The ratio of the metal ion stabilizer to the copper anode mud is 10 mL: 1 g;

[0042] The ratio of the reducing agent to the copper anode mud is 25 mL: 2 g;

[0043] The solid acid additive in the copper anode mud CO2 electrocatalytic material has a mass percentage of 20-30%.

[0044] The carbon-containing support comprises 20-30% by mass in the CO2 electrocatalytic material of the copper anode slime.

[0045] In a preferred embodiment of the present invention, the leaching agent includes H2SO4 and an oxidizing agent. The oxidizing agent includes, but is not limited to, one or more of H2O2, KMnO4, HNO3, O2 and O3. For example, the leaching agent used in the embodiments of the present invention includes H2SO4 and H2O2.

[0046] In a preferred embodiment of the present invention, the concentration of H2SO4 in the leaching agent is 1.5 mol / L, and the concentration of the oxidant is 3 mol / L.

[0047] In a preferred embodiment of the present invention, the metal ion stabilizer includes, but is not limited to, one or more of sodium citrate, polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG). For example, in this embodiment, the metal ion stabilizer used is sodium citrate, and the concentration of sodium citrate is 150 mmol·L⁻¹. -1 .

[0048] In a preferred embodiment of the present invention, the carbon-containing support includes, but is not limited to, one or more of carbon black particles, carbon nanotubes and graphene. For example, the carbon-containing support used in the embodiments of the present invention is carbon black particles.

[0049] In a preferred embodiment of the present invention, the solid acid additive includes, but is not limited to, one or more of molecular sieves, CeO2, TiO2, ZrO2 and WO3. For example, the solid acid additive used in the embodiments of the present invention is CeO2 or TiO2.

[0050] In a preferred embodiment of the present invention, the reducing agent includes, but is not limited to, one or more of NaBH4 (sodium borohydride), Zn powder, ascorbic acid, and formaldehyde. For example, in this embodiment, the reducing agent used is NaBH4 (sodium borohydride), and the concentration of the reducing agent is 150 mmol·L⁻¹. -1 .

[0051] This invention also proposes a method for preparing CO2 electrocatalytic materials from copper anode mud (see flowchart). Figure 1 The copper anode mud was oxidized and leached using a leaching agent to obtain a leachate containing metal components. Then, a metal ion stabilizer, a carbon-containing support, a solid acid additive, and a reducing agent were added to the leachate. After stirring, the mixture was centrifuged, washed, and vacuum dried to obtain the copper anode mud CO2 electrocatalytic material.

[0052] In a preferred embodiment of the present invention, the dropping rate of the reducing agent is 3-4 drops per second, and the temperature of the stirring reaction is 18-30°C. By controlling the reduction rate and reduction temperature during the addition of the reducing agent, catalyst agglomeration into large particles is prevented. For example, in an embodiment of the present invention, the dropping rate of the reducing agent is 4 drops per second, and the temperature of the stirring reaction is 25°C.

[0053] In a preferred embodiment of the present invention, the vacuum drying temperature is 60°C and the time is 6 hours.

[0054] This invention uses H2SO4 and oxidizing agents as leaching agents to oxidize and dissolve metallic elements (such as Ag, Cu, Se, Te, etc.) in copper anode mud into a solution. H2SO4 provides an acidic environment, which facilitates the dissolution of the metal. Under acidic conditions, oxidizing agents such as hydrogen peroxide can oxidize the metal to a higher oxidation state; for example, silver (Ag) may be oxidized to Ag. + Copper (Cu) can be oxidized to Cu 2+ Selenium (Se) may be oxidized to SeO4. 2- Tellurium (Te) may be oxidized to TeO4. 2-Carbon black particles, acting as a carrier, provide a physical surface that facilitates the adsorption and subsequent reduction of metal ions. Solid acid additives act as catalysts, promoting the reduction process. With the help of metal ion stabilizers, the reducing agent can reduce metal ions to elemental metals. In this process, the reducing agent is oxidized, and the metal ions are reduced. After the reduction reaction is complete, the solid catalyst and liquid are separated by stirring and filtration, and excess moisture is removed by drying to obtain a dry catalyst material. Throughout the process, the oxidation and reduction of metal ions are crucial steps. By controlling the reaction conditions and adding appropriate additives, effective leaching and reduction of metal elements can be achieved, ultimately yielding the desired copper anode mud CO2 electrocatalytic material.

[0055] All materials used in the embodiments of this invention were purchased commercially. The copper anode mud used was sourced from a copper smelting enterprise in Yunnan Province. The initial parameters are shown in Table 1.

[0056] Table 1 Elemental Content of Copper Anode Sludge

[0057]

[0058] The technical solution of the present invention will be further illustrated by the following embodiments.

[0059] Example 1

[0060] Metal elements in copper anode slime were oxidatively leached using a leaching agent (H2SO4 + H2O2 solution). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of H2O2 solution was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of anode slime was 2 g. This process transferred the metal components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain a leachate. A carbon-containing support (carbon black particles) and a solid acid additive (CeO2) were added to the leachate to make the mass ratio of carbon black particles in the CO2 electrocatalytic material of the copper anode slime 20% and the mass ratio of CeO2 30%. Then, 20 mL of a 150 mmol·L⁻¹ solution was rapidly added. -1 The metal ion stabilizer (sodium citrate solution) was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1 The reducing agent (sodium borohydride solution) reduces the metal ions at a dropping rate of 4 drops per second. The mixture is rapidly stirred at 25°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0061] Example 2

[0062] Same as Example 1, except that the solid acid additive CeO2 is replaced with TiO2, specifically including the following steps:

[0063] The metal elements in the copper anode slime were oxidatively leached using a leaching agent (H2SO4 + H2O2 aqueous solution). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of H2O2 aqueous solution was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of anode slime was 2 g. This process transferred the metal components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain a leachate. A carbon-containing support (carbon black particles) and a solid acid additive (TiO2) were added to the leachate to make the mass ratio of carbon black particles in the CO2 electrocatalytic material of the copper anode slime 20% and the mass ratio of TiO2 30%. Then, 20 mL of a 150 mmol·L⁻¹ solution was rapidly added. -1 The metal ion stabilizer (sodium citrate solution) was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1 The reducing agent (sodium borohydride solution) reduces the metal ions at a dropping rate of 4 drops per second. The mixture is rapidly stirred at 25°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0064] Example 3

[0065] Same as Example 1, except that the mass ratio of carbon-containing support (carbon black particles) and solid acid additive (CeO2) in the CO2 electrocatalytic material of copper anode mud is changed, specifically including the following steps:

[0066] The metal elements in the copper anode slime were oxidatively leached using a leaching agent (H2SO4 + H2O2 aqueous solution). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of H2O2 aqueous solution was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of anode slime was 2 g. This transferred the metal components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain the leachate. A carbon-containing support (carbon black particles) and a solid acid additive (CeO2) were added to the leachate to make the mass ratio of carbon black particles in the CO2 electrocatalytic material of the copper anode slime 30% and the mass ratio of CeO2 20%. Then, 20 mL of a 150 mmol·L⁻¹ solution was rapidly added. -1 The metal ion stabilizer (sodium citrate solution) was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1 The reducing agent (sodium borohydride solution) reduces the metal ions at a dropping rate of 4 drops per second. The mixture is rapidly stirred at 25°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0067] Comparative Example 1

[0068] Same as Example 1, except that the addition of solid acid additive CeO2 is omitted, and the specific steps include:

[0069] The metal elements in the copper anode slime were oxidatively leached using a leaching agent (H2SO4 + H2O2 aqueous solution). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of H2O2 aqueous solution was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of anode slime was 2 g. This process transferred the metal components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain a leachate. A carbon-containing support (carbon black particles) was added to the leachate to make the carbon black particles account for 20% of the CO2 electrocatalytic material in the copper anode slime. Then, 20 mL of a 150 mmol·L⁻¹ solution was rapidly added. -1 The metal ion stabilizer (sodium citrate solution) was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1 The reducing agent (sodium borohydride solution) reduces the metal ions at a dropping rate of 4 drops per second. The mixture is rapidly stirred at 25°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0070] Comparative Example 2

[0071] Same as Example 1, except that the addition of the metal ion stabilizer (sodium citrate solution) is omitted. Due to the lack of the metal ion stabilizer, Ag and Cu ions will agglomerate on a large scale during the reduction process, which will result in the failure to successfully prepare the copper anode mud CO2 electrocatalytic material.

[0072] Comparative Example 3

[0073] Same as Example 1, except that the addition of the reducing agent (sodium borohydride solution) is omitted. Due to the lack of the reducing agent, Ag and Cu ions cannot be reduced to generate electrocatalytically active elemental Ag and Cu, resulting in the failure to successfully prepare the copper anode mud CO2 electrocatalytic material.

[0074] Comparative Example 4

[0075] Same as Example 1, except that the mass ratio of carbon-containing support (carbon black particles) and solid acid additive (CeO2) in the CO2 electrocatalytic material of copper anode mud is changed, specifically including the following steps:

[0076] Metal elements in copper anode slime were oxidatively leached using a leaching agent (H2SO4 + H2O2 aqueous solution). The concentration of H2SO4 in the leaching agent was 1.5 mol / L, the concentration of H2O2 aqueous solution was 3 mol / L, the amount of leaching agent was 20 mL, and the amount of anode slime was 2 g. This process transferred the metal components such as Ag, Cu, Se, and Te in the copper anode slime to the liquid phase to obtain a leachate. A carbon-containing support (carbon black particles) and a solid acid additive (CeO2) were added to the leachate to make the mass ratio of carbon black particles in the CO2 electrocatalytic material of the copper anode slime 10% and the mass ratio of CeO2 40%. Then, 20 mL of a 150 mmol·L⁻¹ solution was rapidly added.-1 The metal ion stabilizer (sodium citrate solution) was stirred for 10 min, and after stabilization, 25 mL of 30 mmol·L⁻¹ metal ion stabilizer was added dropwise. -1 The reducing agent (sodium borohydride solution) reduces the metal ions at a dropping rate of 4 drops per second. The mixture is rapidly stirred at 25°C for 2 hours, filtered and washed, and then vacuum dried at 60°C for 6 hours to obtain copper anode mud CO2 electrocatalytic material.

[0077] Electrocatalytic performance test

[0078] The electrocatalytic performance of the copper anode mud CO2 electrocatalytic materials prepared in Examples 1-3 and Comparative Examples 1-4 was determined by linear sweep voltammetry (LSV) and constant current electrolysis (it) tests, respectively. The results are shown in Table 2.

[0079] Table 2 Electrocatalytic performance of electrocatalytic materials in Examples 1-3 and Comparative Examples 1-4

[0080] <![CDATA[Current density (mA / cm 2 )]]> CO Faraday efficiency (%) Example 1 50 90 Example 2 35 70 Example 3 40 80 Comparative Example 1 30 60 Comparative Example 2 0 0 Comparative Example 3 0 0 Comparative Example 4 40 75

[0081] As can be seen from Table 2, Comparative Examples 2 and 3 have no electrocatalytic performance. This is because the catalyst product could not be successfully prepared by omitting the stabilizer or reducing agent. The performance of Comparative Example 4 is worse than that of Example 2. This is because the catalytic performance enhancement effect of TiO2 in Example 2 is not as good as that of CeO2. The performance of the comparative examples is lower than that of Example 1. This is because the proportion of each group in Example 1 is optimal. The carbon support content in Comparative Example 4 is too low, which affects the conductivity of the catalyst.

[0082] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A copper anode mud CO2 electrocatalytic material, characterized in that, The raw materials include copper anode mud, leaching agent, metal ion stabilizer, carbon-containing carrier, solid acid additive and reducing agent; The ratio of the copper anode mud to the leaching agent is 1g:10mL; The ratio of the metal ion stabilizer to the copper anode mud is 10 mL: 1 g; The ratio of the reducing agent to the copper anode mud is 25 mL: 2 g; The solid acid additive accounts for 20-30% of the mass of the CO2 electrocatalytic material in the copper anode mud. The carbon-containing support accounts for 20-30% of the mass of the CO2 electrocatalytic material in the copper anode slime. The leaching agent includes H2SO4 and an oxidizing agent, wherein the oxidizing agent includes one or more of H2O2, KMnO4, HNO3, O2, and O3; The metal ion stabilizer is selected from one or more of sodium citrate, polyvinylpyrrolidone and polyethylene glycol; The solid acid additive is selected from one or more of molecular sieves, CeO2, TiO2, ZrO2, and WO3; The reducing agent is selected from one or more of NaBH4, Zn powder, ascorbic acid and formaldehyde; The preparation method of the copper anode mud CO2 electrocatalytic material includes the following steps: The copper anode mud was oxidized and leached using a leaching agent to obtain a leachate containing metal components. Then, a metal ion stabilizer, a carbon support, a solid acid additive, and a reducing agent were added to the leachate. After stirring, the mixture was centrifuged, washed, and vacuum dried to obtain the copper anode mud CO2 electrocatalytic material.

2. The copper anode mud CO2 electrocatalytic material according to claim 1, characterized in that, The leaching agent has an H2SO4 concentration of 1.5 mol / L and the oxidant concentration is 3 mol / L.

3. The copper anode mud CO2 electrocatalytic material according to claim 1, characterized in that, The carbon-containing support is selected from one or more of carbon black particles, carbon nanotubes, and graphene.

4. The copper anode mud CO2 electrocatalytic material according to claim 1, characterized in that, The concentration of the metal ion stabilizer is 150 mmol·L⁻¹. -1 The concentration of the reducing agent is 150 mmol·L⁻¹. -1 .

5. A method for preparing the copper anode mud CO2 electrocatalytic material according to any one of claims 1 to 4, characterized in that, Includes the following steps: The copper anode mud was oxidized and leached using a leaching agent to obtain a leachate containing metal components. Then, a metal ion stabilizer, a carbon support, a solid acid additive, and a reducing agent were added to the leachate. After stirring, the mixture was centrifuged, washed, and vacuum dried to obtain the copper anode mud CO2 electrocatalytic material.

6. The method for preparing the copper anode slime CO2 electrocatalytic material according to claim 5, characterized in that, The reducing agent drops at a rate of 3 to 4 drops per second.

7. The method for preparing the copper anode slime CO2 electrocatalytic material according to claim 5, characterized in that, The stirring temperature is 18–30°C.

8. The method for preparing the copper anode slime CO2 electrocatalytic material according to claim 5, characterized in that, The vacuum drying temperature is 60°C and the time is 6 hours.

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