Copper-cobalt bimetallic prussian blue analog adsorbent, preparation method thereof and application of the adsorbent in co-removal of ammonia gas and hydrogen sulfide gas at room temperature

Abstract

The application provides a copper-cobalt bimetallic Prussian blue analogue adsorbent, a preparation method thereof and an application of the copper-cobalt bimetallic Prussian blue analogue adsorbent in co-removal of ammonia gas and hydrogen sulfide gas at room temperature. The method comprises the following steps: (1) preparation of a ligand solution; (2) preparation of a mixed metal salt solution; and (3) synthesis of the copper-cobalt bimetallic Prussian blue analogue. The copper-cobalt bimetallic Prussian blue analogue prepared by the precipitation process can be used as a trace odor ammonia gas and hydrogen sulfide solid adsorbent, and co-adsorption of the two trace odor gases can be realized. Furthermore, the preparation process of the application is simple, and the copper-cobalt bimetallic Prussian blue analogue has high adsorption efficiency and high stability, and is particularly suitable for the field of gas co-adsorption, and has wide application prospect and reference value.

Description

Technical Field

[0001] This invention relates to the field of odor gas adsorption and purification technology, specifically to a copper-cobalt bimetallic Prussian blue analog adsorbent, its preparation method, and its application in the co-removal of ammonia and hydrogen sulfide gases at room temperature. Background Technology

[0002] The removal of trace odorous gaseous pollutants at room temperature remains a crucial issue in environmental governance. Various trace amounts of harmful odorous gases are often present in enclosed spaces such as sewage treatment plants, landfills, agricultural facilities (e.g., farm sheds), and submarines. These gases not only cause environmental pollution but also pose serious health risks. Ammonia (NH3) and hydrogen sulfide (H2S) are the two most common trace odorous gaseous pollutants. Long-term exposure to low concentrations of ammonia and hydrogen sulfide can cause significant damage to the visual and respiratory systems, and may even lead to suffocation or death. According to my country's GJB 11B-2012 standard, the permissible concentration of hydrogen sulfide in enclosed spaces cannot exceed 0.07 mg / m³. 3 The permissible concentration of ammonia gas must not exceed 3.5 mg / m³. 3 Therefore, developing highly efficient adsorbents that can simultaneously remove trace amounts of ammonia and hydrogen sulfide at room temperature is of paramount importance for reducing environmental pollution and purifying the air. Adsorption methods are widely used in gas purification due to their advantages such as simple and effective processes, low cost, environmental friendliness, and ease of operation. Among these advantages, developing adsorbents with high adsorption capacity, high selectivity, and good stability is crucial for adsorption methods.

[0003] Traditional adsorbents such as carbon materials and molecular sieves primarily remove odorous gases through physical adsorption, with limited adsorption capacity. Prussian blue analogues, however, exhibit broad application prospects in adsorption separation due to their ultra-high specific surface area, tunable pore size, highly dispersed metal sites, and good thermal and chemical stability. Prussian blue analogues possess simple cubic and nanoscale crystal structures, bridging octahedral metal ions linearly via cyanide anions. Within Prussian blue analogue crystals, there are two types of adsorption sites for small molecules: interstitial sites and vacancy sites. Vacancy sites are caused by the absence of [M(CN)6] units; open metal sites facilitate highly selective capture of trace small molecule gases through coordination interactions. Small molecule gases are mainly adsorbed onto vacancy sites through coordination with the metal. Excessive vacancies may lead to local lattice instability or structural defects, while insufficient vacancies may limit the improvement of adsorption performance. Traditional adsorbents such as carbon materials and molecular sieves mainly remove odorous gases through physical adsorption, with limited adsorption capacity. However, the metal at the vacant sites of Prussian blue analogues can complex with target gases such as ammonia through complexation, thus exhibiting excellent adsorption performance. Akira Takahashi et al. reported that a traditional pigment, Prussian blue PB, had a static adsorption capacity of 12.5 mmol / g for ammonia at 0.1 MPa, which is greater than that of any traditional adsorbent (Takahashi Akira, et al. "Historical Pigment Exhibiting Ammonia Gas Capture beyond Standard Adsorbents with Adsorption Sites of Two Kinds." Journal of the American Chemical Society 138.20(2016):6376-9.). However, the Prussian blue analogues reported so far still have some shortcomings: (1) For Prussian blue analogue adsorbents targeting a single metal site, when ammonia and hydrogen sulfide are present simultaneously, competitive adsorption occurs, resulting in a significant decrease in adsorption performance compared to a single adsorption system. Specifically, ammonia molecules can coordinate with metal sites through nitrogen atoms, thereby occupying the active sites of the metal center in Prussian blue analogs, and thus competing with hydrogen sulfide for adsorption, inhibiting the adsorption of hydrogen sulfide. (2) Although high density of vacancy sites is beneficial to high adsorption capacity, too many vacancy sites will lead to local instability or structural defects in the crystal lattice, resulting in poor material structural stability and easy collapse. Therefore, developing more stable and efficient Prussian blue analog adsorbents for the removal of trace odor gases at room temperature and studying their adsorption mechanism in depth has important practical application and theoretical guiding significance. Summary of the Invention

[0004] In view of this, and to overcome the shortcomings of the prior art, the present invention aims to provide a copper-cobalt bimetallic Prussian blue analog adsorbent, its preparation method, and its application in the co-removal of ammonia and hydrogen sulfide gases at room temperature. The copper-cobalt bimetallic Prussian blue analog adsorbent proposed in this invention comprises two metal sites, copper and cobalt, and can effectively adsorb and deeply remove low concentrations of ammonia and hydrogen sulfide. Simultaneously, this adsorbent maintains a stable face-centered cubic structure during adsorption, ensuring the continuity and stability of its adsorption performance. Using this adsorbent for gas removal treatment not only offers good green economic benefits but also possesses excellent performance stability, meeting the long-term requirements of industrial applications.

[0005] To achieve the objectives of the invention described above, the present invention provides the following technical solution:

[0006] A copper-cobalt bimetallic Prussian blue analog adsorbent for the co-removal of ammonia and hydrogen sulfide gases at room temperature, wherein the basic structure of the copper-cobalt bimetallic Prussian blue analog adsorbent consists of metal ions and ligands, wherein the molar ratio of the metal ions to the ligands is 1.5 to 3.0; wherein the metal ions are copper ions and cobalt ions; and wherein the ligands are cyanide salts.

[0007] Preferably, the copper-cobalt bimetallic Prussian blue analog adsorbent contains two metal ion sites, copper ions and cobalt ions, and the molar ratio of copper ions to cobalt ions is at least one of 1:5, 1:2, 1:1, 2:1, and 5:1.

[0008] Preferably, the cyanide salt is at least one selected from potassium cobalt cyanide, potassium iron cyanide, potassium nickel cyanide, and potassium manganese cyanide. The cyanide ion (CN-) in the cyanide salt acts as a bridging agent, forming a three-dimensional network structure through coordination with metal ions.

[0009] Preferably, the metal salt is derived from at least one of chloride, sulfate, and nitrate.

[0010] Preferably, the specific surface area of ​​the copper-cobalt bimetallic Prussian blue analog adsorbent is 500–1000 m². 2 / g, with a micropore size distribution of 0.5–1 nm, and containing both mesopores and macropores.

[0011] A method for preparing a copper-cobalt bimetallic Prussian blue analog adsorbent, the method comprising the following steps:

[0012] (1) Preparation of ligand solution: The ligand is dissolved in a solvent and sonicated to obtain solution A;

[0013] (2) Preparation of mixed metal salt solution: 0.01-0.05 mol / L copper metal salt and cobalt metal salt are mixed and dissolved in a solvent, and then dissolved by sonication to obtain solution B;

[0014] (3) Mix solution A from step (1) with solution B from step (2), stir in a water bath at 300-1000 rpm, let stand for 24 hours, centrifuge 4-6 times, wash with deionized water and anhydrous ethanol, dry in a vacuum drying oven at 80℃ for 12-24 hours, grind to obtain a powdered copper-cobalt bimetallic Prussian blue analogue.

[0015] Preferably, in steps (1) and (2), the solvent is at least one of deionized water, ethanol, ethylene glycol, sodium citrate, and N,N-dimethylformamide (DMF), and the concentration of the solvent is 5% to 80% (except for deionized water). Different solvents can affect the crystal growth process, thereby affecting the crystal morphology and size.

[0016] Preferably, in steps (1) and (2), the concentration of the ligand in solution A is 0.01 to 0.04 mol / L.

[0017] Preferably, the molar ratio of copper ions to cobalt ions in step (2) is at least one of 1:5, 1:2, 1:1, 2:1, and 5:1.

[0018] Preferably, the water bath stirring temperature in step (3) is 25–80°C.

[0019] Preferably, the water bath stirring time in step (3) is 12 to 24 hours.

[0020] An application of the copper-cobalt bimetallic Prussian blue analog adsorbent as described above, wherein the use is for the co-removal of low concentrations of ammonia and hydrogen sulfide at room temperature.

[0021] Preferably, the concentration range of the trace hydrogen sulfide is 5–100 × 10⁻⁶. -6 mol / mol-air; the trace ammonia concentration range is 1000~5000×10 -6 mol / mol-air.

[0022] This invention proposes a method for preparing a copper-cobalt bimetallic Prussian blue analog adsorbent for the co-removal of ammonia (NH3) and hydrogen sulfide (H2S) gases at room temperature. The method employs a liquid co-precipitation process, mixing metal salt solutions with ligand solutions in different molar ratios, and preparing the copper-cobalt bimetallic Prussian blue analog through a precipitation reaction. By adjusting the ratio of copper and cobalt, the number and size of vacancies in the Prussian blue analog can be precisely controlled, thereby optimizing its adsorption performance and structural stability for ammonia and hydrogen sulfide. This adsorbent not only features a simple preparation process but also exhibits excellent adsorption efficiency and high stability, demonstrating broad application potential.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) This invention effectively solves the problem of competitive adsorption of hydrogen sulfide and ammonia on the same metal site by introducing bimetallic adsorption sites with strong adsorption effects on ammonia and hydrogen sulfide on a Prussian blue analog adsorbent, thereby achieving efficient co-removal of hydrogen sulfide and ammonia.

[0025] (2) The copper-cobalt bimetallic Prussian blue analog adsorbent prepared by this invention exhibits excellent structural stability. By precisely adjusting the ratio and vacancy characteristics of the two metals, copper and cobalt, the structural stability of the adsorbent is ensured during long-term use, avoiding the performance degradation problem caused by structural changes during the recycling process of traditional adsorbents. This structural stability enables the adsorbent of this invention to maintain high adsorption performance in long-term applications, meeting the requirements for durable performance and stability at room temperature.

[0026] (3) The copper-cobalt bimetallic Prussian blue analog adsorbent prepared in this invention has the advantages of high initial purification efficiency (≥95%) for trace ammonia (NH3) and hydrogen sulfide (H2S) under normal temperature and pressure conditions, and high breakthrough adsorption capacity (NH3 ≮149.6 mg / g; H2S ≮28.8 mg / g). Attached Figure Description

[0027] Figure 1 These are X-ray diffraction patterns of the copper-cobalt bimetallic Prussian blue analog adsorbents prepared in Examples 1-5.

[0028] Figure 2 These are the NH3 breakthrough curves of the copper-cobalt bimetallic Prussian blue analog adsorbents prepared in Examples 1-5 under normal temperature and pressure conditions.

[0029] Figure 3 The H2S breakthrough curves of the copper-cobalt bimetallic Prussian blue analog adsorbents prepared in Examples 1-5 are shown under normal temperature and pressure conditions.

[0030] Figure 4 The images show the XRD patterns of the copper-cobalt bimetallic Prussian blue analog adsorbent prepared in Example 2 before and after adsorbing NH3 and H2S.

[0031] Figure 5 The XRD patterns of the copper-cobalt bimetallic Prussian blue analog adsorbent prepared in Comparative Example 1 before and after adsorbing NH3 and H2S are shown.

[0032] Figure 6 The H2S breakthrough curves of the copper-cobalt bimetallic Prussian blue analog adsorbent prepared in Example 2 and Comparative Example 2 under normal temperature and pressure conditions are shown. Detailed Implementation

[0033] The following describes preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0034] Example 1

[0035] Dissolve 3.2 mmol of potassium cobalt cyanide in 50 mL of aqueous solution and sonicate to obtain solution A. Dissolve 1.6 mmol of copper chloride and 3.2 mmol of cobalt chloride in 50 mL of aqueous solution and sonicate to obtain solution B. Add solution B dropwise to solution A and mix. Stir at 25°C for 12–24 h at 300–500 rpm. Let stand for 24 h to age. Then transfer to centrifuge tube and centrifuge. Wash 4–5 times with 30 mL of deionized water each time, wash once with anhydrous ethanol, dry in a vacuum drying oven at 80°C for 12 h, grind to obtain powdered copper-cobalt bimetallic Prussian blue analogue, denoted as sample #1.

[0036] Example 2

[0037] Dissolve 3.2 mmol of potassium cobalt cyanide in 50 mL of aqueous solution and sonicate to obtain solution A. Dissolve 2.4 mmol of copper chloride and 2.4 mmol of cobalt chloride in 50 mL of aqueous solution and sonicate to obtain solution B. Add solution B dropwise to solution A and mix. Stir at 25°C for 12–24 h at 300–500 rpm. Let stand for 24 h to age. Then transfer to centrifuge tube and centrifuge. Wash 4–5 times with 30 mL of deionized water each time, wash once with anhydrous ethanol, dry in a vacuum drying oven at 80°C for 12 h, grind to obtain powdered copper-cobalt bimetallic Prussian blue analogue, denoted as sample #2.

[0038] Example 3

[0039] Dissolve 3.2 mmol of potassium cobalt cyanide in 50 mL of 70% ethylene glycol solution and sonicate to obtain solution A. Dissolve 2.4 mmol of copper chloride and 2.4 mmol of cobalt chloride in 50 mL of 70% ethylene glycol solution and sonicate to obtain solution B. Add solution B dropwise to solution A and mix. Stir at 300-500 rpm for 12-24 h in a water bath at 25 °C. Let stand for 24 h to age. Then transfer to a centrifuge tube and centrifuge. Wash 4-5 times with 30 mL of deionized water each time, wash once with anhydrous ethanol, dry in a vacuum drying oven at 80 °C for 12 h, grind to obtain powdered copper-cobalt bimetallic Prussian blue analogue, designated as sample #3.

[0040] Example 4

[0041] Dissolve 3.2 mmol of potassium cobalt cyanide in 50 mL of aqueous solution and sonicate to obtain solution A. Dissolve 3.2 mmol of copper chloride and 1.6 mmol of cobalt chloride in 50 mL of aqueous solution and sonicate to obtain solution B. Add solution B dropwise to solution A and mix. Stir at 25°C for 12–24 h at 300–500 rpm. Let stand for 24 h and then transfer to centrifuge tubes. Wash 4–5 times with 30 mL of deionized water each time, wash once with anhydrous ethanol, dry in a vacuum drying oven at 80°C for 12 h, grind to obtain powdered copper-cobalt bimetallic Prussian blue analogue, designated as sample #4.

[0042] Example 5

[0043] Dissolve 3.2 mmol of potassium cobalt cyanide in 50 mL of 8% sodium citrate solution and sonicate to obtain solution A. Dissolve 2.4 mmol of copper chloride and 2.4 mmol of cobalt chloride in 50 mL of 8% sodium citrate solution and sonicate to obtain solution B. Add solution B dropwise to solution A and mix. Stir at 25°C for 12–24 h at 300–500 rpm. Let stand for 24 h to age. Then transfer to centrifuge tube and centrifuge. Wash 4–5 times with 30 mL of deionized water each time, wash once with anhydrous ethanol, dry in a vacuum drying oven at 80°C for 12 h, grind to obtain powdered copper-cobalt bimetallic Prussian blue analogue, designated as sample #5.

[0044] Effect Example

[0045] like Figure 1 As shown, Figure 1 The figures show the XRD patterns of the copper-cobalt bimetallic Prussian blue analogs prepared in Examples 1-5. As can be seen from the figures, the obtained materials exhibit characteristic peaks at 16.9°, 24.4°, 35.0°, 39.1°, 43.1°, 50.3°, 53.6°, and 56.7°, with the overall peak positions falling between Cu-PBA (JCPDS: 02-0169) and Co-PBA (JCPDS: 22-0215). These characteristic peaks are attributed to the (200), (220), (400), (420), (422), (440), (600), and (620) crystal plane diffraction peaks, respectively. The materials exhibit strong diffraction peaks and narrow half-maximum widths (WHMs), indicating the successful synthesis of a copper-cobalt bimetallic Prussian blue analog with good crystallinity.

[0046] The adsorption effects of Examples 1-5 on 3000ppm ammonia and 50ppm hydrogen sulfide were compared, and the breakthrough capacity of each material is shown in Table 1.

[0047] Table 1. Transmission adsorption capacity of NH3 and H2S in Examples 1-5

[0048]

[0049]

[0050] like Figure 2 As shown, Figure 2 These are the ammonia permeation curves of the copper-cobalt bimetallic Prussian blue analogs prepared in Examples 1-5 at room temperature and pressure, with an NH3 concentration of 3000 × 10⁻⁶. -6 mol / mol-air. The time required for the outlet concentration to reach 5% of the initial concentration was defined as the breakthrough time, and the corresponding adsorption capacity was defined as the permeation adsorption capacity. In Examples 1-5, the breakthrough times were 103.7, 73.6, 96.2, 66.2, and 88.7 min, respectively, corresponding to NH3 permeation adsorption capacities of 13.9, 9.7, 12.8, 8.8, and 11.8 mmol / g. The results show that the copper-cobalt bimetallic Prussian blue analogue of the present invention can effectively purify trace amounts of NH3. The copper-cobalt bimetallic Prussian blue analogue in Example 1 exhibited superior adsorption capacity compared to Examples 2 and 4. This is because Example 1 has more cobalt metal adsorption sites, and the surface properties and electronic structure of cobalt enable it to coordinate with more NH3, thereby increasing the amount of NH3 adsorbed.

[0051] like Figure 3 As shown, Figure 3 These are the hydrogen sulfide permeation curves of the copper-cobalt bimetallic Prussian blue analogs prepared in Examples 1-5 at room temperature and pressure, with an H2S concentration of 50 × 10⁻⁶. -6 mol / mol-air. The time required for the outlet concentration to reach 5% of the initial concentration was defined as the breakthrough time, and the corresponding adsorption capacity was defined as the permeation capacity. In Examples 1, 2, 3, 4, and 5, the breakthrough times were 441.9, 387.9, 429.4, 335.6, and 399.2 min, respectively, corresponding to H2S permeation adsorption capacities of 1.18, 1.04, 1.15, 0.90, and 1.07 mmol / g. The results show that the copper-cobalt bimetallic Prussian blue analogue of this invention can effectively purify trace amounts of H2S.

[0052] like Figure 4 As shown, Figure 4 The images show the XRD patterns of the copper-cobalt bimetallic Prussian blue analog prepared in Example 2 before and after adsorption of NH3 and H2S. It can be seen that the structure of the copper-cobalt bimetallic Prussian blue analog prepared in Example 2 remains unchanged after adsorption of NH3 and H2S, and the diffraction peak intensities of the material remain almost unchanged, indicating that the copper-cobalt bimetallic Prussian blue analog can maintain strong structural stability during the adsorption process.

[0053] To further illustrate the superiority of the proposed solution, the following comparative examples are provided.

[0054] Comparative Example 1

[0055] The difference between Comparative Example 1 and Example 2 is that only copper chloride solution and potassium cobalt cyanide solution were mixed to react and obtain a copper Prussian blue analog adsorbent. The adsorption performance of this adsorbent for ammonia and hydrogen sulfide was tested. It was found that the structure of the copper Prussian blue analog adsorbent changed after adsorbing ammonia, and the structure almost collapsed after adsorbing hydrogen sulfide. Figure 5 As shown in the examples and comparative examples above, the copper-cobalt bimetallic Prussian blue analog adsorbent provided by the present invention for the co-removal of low-concentration ammonia and hydrogen sulfide under normal temperature and pressure has strong structural stability.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 2 is that only cobalt chloride solution and potassium cobalt cyanide solution were mixed to react and obtain a cobalt Prussian blue analog adsorbent. The adsorption performance of this adsorbent for ammonia and hydrogen sulfide was tested, and it was found that the adsorbent's performance in removing hydrogen sulfide after adsorbing ammonia was poor, significantly lower than the adsorption effect of Example 2. Figure 6 As shown. This is because the adsorbed ammonia gas has a strong complexation with metallic cobalt, occupying almost all of the active sites of metallic cobalt in the adsorbent. This prevents hydrogen sulfide from continuing to react chemically with the metal sites, thus reducing the adsorption performance.

[0058] Comparative Example 3

[0059] Compared to Example 2, Comparative Example 3 differs in that the sum of the amounts of copper chloride and cobalt chloride is 2.4 mmol, only half that of Example 2, which does not meet the stoichiometric ratio and is too low. Other conditions are the same as in Example 2, and a copper-cobalt Prussian blue analog adsorbent is prepared. It was found that due to the low amounts of copper chloride and cobalt chloride, potassium cobalt cyanide could not react with sufficient copper and cobalt ions, leading to a decrease in the conversion rate of the reactants and a reduction in the yield of the copper-cobalt Prussian blue analog. Furthermore, testing the ammonia and hydrogen sulfide adsorption breakthrough curves of this bimetallic copper-cobalt Prussian blue analog adsorbent revealed that its ammonia and hydrogen sulfide breakthrough adsorption capacities were both lower than those of Example 2. This is because a lower proportion of metal salts may lead to a reduction or incomplete formation of adsorption sites, resulting in a decrease in the specific surface area of ​​the final product and a weakening of adsorption performance.

[0060] Comparative Example 4

[0061] Compared to Example 2, Comparative Example 4 differs in that the stirring time for solutions A and B is 10 min, while other conditions remain the same as in Example 2, resulting in the preparation of a copper-cobalt Prussian blue analog adsorbent. It can be seen that the XRD pattern of the product shows a significantly lower diffraction peak intensity. This is because the reaction time is too short, and the generated Prussian blue analog may not have fully crystallized, or the crystal structure may be incomplete, leading to irregular crystal morphology, or even an amorphous or non-crystalline substance. Furthermore, testing the ammonia and hydrogen sulfide adsorption breakthrough curves of this bimetallic copper-cobalt Prussian blue analog adsorbent revealed that its ammonia and hydrogen sulfide breakthrough adsorption capacities are both lower than those of Example 2. This is because the shorter reaction time may lead to incomplete crystal growth, forming smaller or non-uniform particles, ultimately reducing the specific surface area and directly causing a decrease in the adsorption performance of the Prussian blue analog.

Claims

1. A copper-cobalt bimetallic Prussian blue analog adsorbent, characterized in that, The copper-cobalt bimetallic Prussian blue analog adsorbent has a face-centered cubic crystal structure; its basic structure consists of copper and cobalt ions as node metal ions, and a cyanide salt as a ligand, wherein the cyanide salt is potassium cobalt cyanide; the molar ratio of copper ions to cobalt ions is 1:5, 1:2, 1:1, 2:1, or 5:1; the specific surface area of ​​the copper-cobalt bimetallic Prussian blue analog adsorbent is 500~1000 m². 2 / g, and has a hierarchical pore structure including micropores, mesopores and macropores, wherein the micropore size distribution is 0.5~1 nm.

2. The copper-cobalt bimetallic Prussian blue analog adsorbent as described in claim 1, characterized in that, The metal ions are derived from at least one of chloride, sulfate, and nitrate.

3. A method for preparing a copper-cobalt bimetallic Prussian blue analog adsorbent according to any one of claims 1 to 2, characterized in that, Includes the following steps: Step 1: Preparation of ligand solution: The ligand is dissolved in a solvent and sonicated to obtain solution A; the solvent is at least one selected from deionized water, ethanol, ethylene glycol, sodium citrate, and N,N-dimethylformamide (DMF), and the mass percentage concentration of the solvent other than deionized water is 5%~80%; the concentration of the ligand in solution A is 0.01~0.04 mol / L; Step 2: Preparation of mixed metal salt solution: 0.01~0.05 mol / L copper and cobalt metal salts are mixed and dissolved in a solvent, and then dissolved by sonication to obtain solution B; the solvent is at least one selected from deionized water, ethanol, ethylene glycol, sodium citrate, and N,N-dimethylformamide (DMF), and the mass percentage concentration of the solvent excluding deionized water is 5%~80%; Step 3: Mix solution A and solution B, stir in a water bath at 300-1000 rpm, let stand for aging for 12-24 h, centrifuge 4-6 times, wash with deionized water and anhydrous ethanol, dry in a vacuum drying oven at 60-80 ℃ for 12-24 h, grind to obtain a powdered copper-cobalt bimetallic Prussian blue analogue.

4. The preparation method according to claim 3, characterized in that, In step 3, the water bath stirring temperature range is 25~80℃, and the time is 12~24 h.

5. An application of the copper-cobalt bimetallic Prussian blue analog adsorbent as described in claim 1, characterized in that, This technology is applicable to the simultaneous and efficient adsorption and purification of trace amounts of odorous gases such as hydrogen sulfide and ammonia at room temperature, wherein the concentration of the trace hydrogen sulfide ranges from 5 to 100 × 10⁻⁶. -6 mol / mol-air; the trace ammonia concentration range is 1000~5000×10 -6 mol / mol-air.

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