Preparation method and application of silver phosphate particles with conical surfaces
By controlling the ratio of silver nitrate and ammonia water to adjust the morphology of silver phosphate particles, surface conical silver phosphate particles were prepared, which solved the problem of uneven catalytic performance in the existing technology and achieved the effect of efficient catalytic decomposition of phenol.
Patent Information
- Application Number
- CN202510646110.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-09-09
AI Technical Summary
The differences in the morphology and structure of existing silver phosphate particles lead to uneven catalytic performance, especially low efficiency in the catalytic decomposition of phenol.
By controlling the concentration of silver nitrate solution, the concentration of ammonia water and the ratio of the two, the morphology and structure of the silver phosphate particles are adjusted, and surface conical silver phosphate particles are prepared to achieve efficient photocatalytic decomposition of phenol.
The prepared surface conical silver phosphate particles exhibited significant and efficient catalytic effect in the photocatalytic decomposition of phenol, and the reaction conditions were mild and environmentally friendly.
Smart Images
Figure CN120607230A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of catalysis, and in particular relates to a preparation method and application of surface cone-shaped silver phosphate particles. Background Art
[0002] Silver phosphate has a wide range of industrial applications. For example, it can be used as a photocatalyst to catalyze the degradation of organic pollutants, including phenol, rhodamine B, methylene blue, and gemifloxacin mesylate. It can also be used as a photographic emulsion agent, replacing silver nitrate in the preparation of silver bromide and silver iodide emulsions. It is also used as a plasticizer in the plastics industry. Furthermore, silver phosphate can be used as an additive in electronic components and as an excipient in the pharmaceutical field. When used as an additive in electronic components, the silver ions in silver phosphate can form a conductive network, thereby improving the material's electrical conductivity. Therefore, it is often used in the preparation of electrode materials for flexible circuit boards and microsensors, enhancing signal transmission stability. As an excipient in the pharmaceutical field, silver phosphate can slowly release silver ions, disrupting microbial enzyme activity and preventing bacterial growth. It has excellent antibacterial properties against a wide range of bacteria, making it commonly used in medical products such as wound dressings and orthopedic implant coatings to reduce the risk of postoperative infection.
[0003] However, silver phosphates with different structural characteristics exhibit significant differences in their catalytic and other physical and chemical properties. For example, silver phosphates with different morphologies exhibit significant differences in catalytic performance when decomposing phenol. In summary, the development of silver phosphates with novel structures not only yields highly active catalysts but also contributes to the advancement of fields such as environmental protection, electronic materials, and medicine.
[0004] Therefore, the present invention provides a simple and effective method for preparing silver phosphate particles. The prepared surface-conical silver phosphate particles have better catalytic activity than spherical particles, cubic particles and particles with surface protrusions, thus showing good application prospects in the field of catalysis. Summary of the Invention
[0005] The present invention aims to achieve photocatalytic decomposition of organic molecules by preparing high-performance silver phosphate, providing technical support for addressing issues such as the efficient degradation of organic pollutants during environmental remediation. To this end, the present invention provides a method for preparing silver phosphate particles with conical surfaces and their application. The conical silver phosphate particles produced by the present method exhibit excellent catalytic activity in the photocatalytic decomposition of phenol. Furthermore, the present method is environmentally friendly and operates under mild reaction conditions.
[0006] The first part of the present invention provides a method for preparing surface pyramidal silver phosphate particles.
[0007] The method for preparing surface-conical silver phosphate particles comprises the following steps:
[0008] Adding ammonia water to the silver nitrate solution, and then adding Na2HPO4 solution, stirring and mixing to obtain a precipitate, and washing to obtain the surface conical silver phosphate particles;
[0009] The concentration of the silver nitrate solution is 15-25 mmol / L;
[0010] The concentration of the ammonia water is 1.0-5.0% by mass;
[0011] The volume ratio of the silver nitrate solution to the ammonia water is 20:(1.0-1.2).
[0012] Preferably, the concentration of the silver nitrate solution is 22-25 mmol / L, for example, 25 mmol / L.
[0013] Preferably, the concentration of the ammonia water is 2.0-2.5% by mass.
[0014] Preferably, the volume ratio of the silver nitrate solution to the Na2HPO4 solution is 20:(4-6), for example 20:6.
[0015] Preferably, after adding the ammonia water, the stirring time is 20-30 minutes.
[0016] Preferably, the concentration of the Na2HPO4 solution is 0.05-0.15 mol / L, more preferably 0.10-0.15 mol / L.
[0017] Preferably, the volume of the Na2HPO4 solution is 4-6 mL, more preferably 5-6 mL.
[0018] Preferably, after adding the Na2HPO4 solution, the stirring time is 0.5-4h.
[0019] Preferably, the washing process is to wash the precipitate multiple times with pure water, for example, 2-5 times.
[0020] The second aspect of the present invention provides surface-conical silver phosphate particles.
[0021] The surface-conical silver phosphate particles are prepared by the above preparation method.
[0022] The third part of the present invention provides the application of the surface pyramidal silver phosphate particles prepared by the above preparation method.
[0023] Application of the surface conical silver phosphate particles prepared by the above preparation method in the field of catalysis.
[0024] Preferably, the application includes the application of photocatalytic decomposition of phenol.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] The preparation method of the present invention adjusts the morphology of the silver phosphate particles by controlling the concentration of the silver nitrate solution, the concentration of the ammonia solution, and the ratio of the silver nitrate solution to the ammonia solution, thereby producing silver phosphate particles with a conical surface. The conical surface silver phosphate particles produced by the preparation method of the present invention exhibit excellent catalytic performance in the photocatalytic decomposition of phenol. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is an SEM image of the surface-conical silver phosphate particles prepared in Example 1;
[0028] Figure 2 This is an SEM image of the surface-conical silver phosphate particles prepared in Example 2;
[0029] Figure 3 This is an SEM image of the silver phosphate particles prepared in Comparative Example 1;
[0030] Figure 4 This is an SEM image of the silver phosphate particles prepared in Comparative Example 2;
[0031] Figure 5 This is an SEM image of the silver phosphate particles prepared in Comparative Example 3;
[0032] Figure 6 This is an SEM image of the silver phosphate particles prepared in Comparative Example 4;
[0033] Figure 7 This is an SEM image of the silver phosphate particles prepared in Comparative Example 6;
[0034] Figure 8 The photocatalytic decomposition effect of phenol by the silver phosphate particles prepared in Example 1 and Comparative Examples 1-4 is shown. DETAILED DESCRIPTION
[0035] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.
[0036] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.
[0037] Example 1
[0038] The method for preparing surface-conical silver phosphate particles comprises the following steps:
[0039] To 20 mL of 25 mmol / L silver nitrate solution, 1.0 mL of 2.5% (mass fraction) ammonia solution was added under stirring, and the mixture was stirred for 30 minutes to obtain a silver ammonia solution. To the obtained silver ammonia solution, 6 mL of 0.15 mol / L Na2HPO4 solution was added dropwise and stirred for 2 hours to obtain a precipitate. After washing twice with pure water, conical silver phosphate particles were obtained.
[0040] Example 2
[0041] The method for preparing surface-conical silver phosphate particles comprises the following steps:
[0042] To 20 mL of 25 mmol / L silver nitrate solution, 1.2 mL of 2.5% (mass fraction) ammonia solution was added under stirring, and the mixture was stirred for 30 minutes to obtain a silver ammonia solution. To the obtained silver ammonia solution, 6 mL of 0.15 mol / L Na2HPO4 solution was added dropwise and stirred for 2 hours to obtain a precipitate. After washing twice with pure water, conical silver phosphate particles were obtained.
[0043] Comparative Example 1
[0044] Compared with Example 1, the only difference in Comparative Example 1 is that the amount of ammonia solution used is 0.4 mL, and the other processes are the same as those in Example 1.
[0045] Comparative Example 2
[0046] Compared with Example 1, the only difference in Comparative Example 2 is that the amount of ammonia solution used is 0.8 mL, and the other processes are the same as those in Example 1.
[0047] Comparative Example 3
[0048] Compared with Example 1, the only difference in Comparative Example 3 is that the amount of ammonia solution used is 1.5 mL, and the other processes are the same as those in Example 1.
[0049] Comparative Example 4
[0050] Compared with Example 1, the difference of Comparative Example 4 is that the Na 3 PO 4 solution of equal concentration and volume is used to replace the Na 2 HPO 4 solution in Example 1, and the other processes are the same as those in Example 1.
[0051] Comparative Example 5
[0052] Compared with Example 1, the only difference of Comparative Example 5 is that the ammonia solution in Example 1 is replaced by an ammonia solution with a mass fraction of 20%, and the other processes are the same as those in Example 1.
[0053] The result of Comparative Example 5 was that the reaction solution was a clear solution, and no silver phosphate precipitate was generated.
[0054] Comparative Example 6
[0055] Compared with Example 1, the difference of Comparative Example 6 is that the Na2HPO4 solution in Example 1 is replaced by a NaH2PO4 solution of equal concentration and volume, and the other processes are the same as those in Example 1.
[0056] Product effect testing
[0057] Figure 1 The SEM image of the surface-conical silver phosphate particles prepared in Example 1; Figure 1 It can be seen that the silver phosphate particles prepared in Example 1 have a surface pyramidal structure.
[0058] Figure 2 The SEM image of the surface-conical silver phosphate particles prepared in Example 2; Figure 2 It can be seen that the silver phosphate particles prepared in Example 2 have a surface pyramidal structure.
[0059] Figure 3 The SEM image of the silver phosphate particles prepared in Comparative Example 1; Figure 3 It can be seen that the silver phosphate particles prepared in Comparative Example 1 have spherical structural characteristics.
[0060] Figure 4 The SEM image of the silver phosphate particles prepared in Comparative Example 2; Figure 4 It can be seen that the silver phosphate particles prepared in Comparative Example 2 have surface protrusion structures.
[0061] Figure 5 The SEM image of the silver phosphate particles prepared in Comparative Example 3; Figure 5 It can be seen that the silver phosphate particles prepared in Comparative Example 3 have cubic structure characteristics.
[0062] Figure 6 The SEM image of the silver phosphate particles prepared in Comparative Example 4; Figure 6 It can be seen that the particle size and morphology of the product prepared in Comparative Example 4 are not uniform.
[0063] Figure 7 The SEM image of the silver phosphate particles prepared in Comparative Example 6; Figure 7 It can be seen that the product prepared in Comparative Example 6 has no surface cone structure characteristics.
[0064] Figure 8 The photocatalytic decomposition effect of phenol by the silver phosphate particles prepared in Example 1 and Comparative Examples 1-4 is shown. Figure 8 "Time" in the equation represents time, C0 represents the initial concentration of phenol, C represents the concentration during the reaction, and C / C0 represents the degree of reaction. Figure 8The conical silver phosphate corresponds to the product of Example 1 (conical silver phosphate particles), the cubic silver phosphate corresponds to the product of Example 3, the surface protrusion silver phosphate corresponds to the product of Example 2, the spherical silver phosphate corresponds to the product of Example 1, and the silver phosphate prepared from sodium phosphate corresponds to the product of Example 4. Figure 8 It can be seen that under the same conditions, the cone-shaped silver phosphate prepared in Example 1 can complete the photocatalytic decomposition of phenol within 60 minutes, while the silver phosphate particles prepared in Comparative Examples 1-4 require longer decomposition times. This shows that the cone-shaped silver phosphate prepared in Example 1 has a higher efficiency in the catalytic decomposition of phenol.
Claims
1. A method for preparing surface-conical silver phosphate particles, characterized in that: The following steps are involved: Adding ammonia water to the silver nitrate solution, and then adding Na2HPO4 solution, stirring and mixing to obtain a precipitate, and washing to obtain the surface conical silver phosphate particles; The concentration of the silver nitrate solution is 15-25 mmol / L; The concentration of the ammonia water is 1.0-5.0% by mass; The volume ratio of the silver nitrate solution to the ammonia water is 20:(1.0-1.2).
2. The preparation method according to claim 1, characterized in that The concentration of the silver nitrate solution is 22-25 mmol / L.
3. The preparation method according to claim 1, characterized in that The concentration of the ammonia water is 2.0-2.5% by mass.
4. The preparation method according to claim 1, characterized in that The volume ratio of the silver nitrate solution to the Na2HPO4 solution is 20:(4-6).
5. The preparation method according to claim 1, characterized in that The concentration of the Na2HPO4 solution is 0.05-0.15 mol / L.
6. The preparation method according to claim 5, characterized in that The volume of the Na2HPO4 solution is 4-6 mL.
7. The preparation method according to any one of claims 1 to 4, characterized in that The washing process is to use pure water to wash the precipitate multiple times.
8. Surface-conical silver phosphate particles, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 7.
9. Use of the surface-conical silver phosphate particles prepared by the preparation method according to any one of claims 1 to 7 in the field of catalysis.
10. The use according to claim 9, characterized in that The applications include application in the catalytic decomposition of phenol.