CN115338400A - Stable low-boron nano silver sol and preparation method thereof - Google Patents
Stable low-boron nano silver sol and preparation method thereof Download PDFInfo
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 132
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims description 89
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000001179 sorption measurement Methods 0.000 claims abstract description 46
- 239000011347 resin Substances 0.000 claims abstract description 44
- 229920005989 resin Polymers 0.000 claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 12
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 9
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 22
- CQLFBEKRDQMJLZ-UHFFFAOYSA-M silver acetate Chemical compound [Ag+].CC([O-])=O CQLFBEKRDQMJLZ-UHFFFAOYSA-M 0.000 claims description 18
- 229940071536 silver acetate Drugs 0.000 claims description 18
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 16
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 16
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 16
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 claims description 11
- 239000012279 sodium borohydride Substances 0.000 claims description 8
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000012266 salt solution Substances 0.000 claims description 3
- 229940071575 silver citrate Drugs 0.000 claims description 3
- -1 silver ions Chemical class 0.000 claims description 3
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 3
- 229960001516 silver nitrate Drugs 0.000 claims description 3
- QUTYHQJYVDNJJA-UHFFFAOYSA-K trisilver;2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [Ag+].[Ag+].[Ag+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QUTYHQJYVDNJJA-UHFFFAOYSA-K 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
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- 238000006243 chemical reaction Methods 0.000 abstract description 3
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
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- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The invention provides a stable low-boron nano silver sol and a preparation method thereof. The low-boron nano silver sol comprises silver nano particles, a coating agent, water and boron, wherein the boron content is less than 1mg/L; the low-boron nano silver sol is not changed after being stored at room temperature for 12 months. The preparation method of the low-boron nano silver sol comprises the steps of adding boron adsorption resin into initial nano silver sol, stirring and mixing, vibrating for adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano silver sol. The boron adsorption resin is ion exchange resin, a molecular chain of the boron adsorption resin contains a large amount of ortho hydroxyl, and the ion exchange resin is used as an adsorbent, so that some of the boron on the resin and boron in the nano silver sol are subjected to complex reaction, the effect of boron adsorption is achieved, the removal rate of boron is more than 98%, and the stability of the treated low-boron nano silver sol is remarkably improved; the preparation method of the low-boron nano silver sol has the characteristics of simple process, convenience and rapidness in operation, environmental friendliness and the like.
Description
Technical Field
The invention relates to the technical field of nano metal sol, in particular to stable low-boron nano silver sol and a preparation method thereof.
Background
The nano silver has special properties which are not possessed by many macroscopic materials such as small-size effect, surface effect, quantum size effect, macroscopic quantum tunneling effect and the like of the nano material, so that the nano silver has the characteristics of high specific surface area, strong activity and the like, and is widely applied to the fields of various mildew-resistant and antibacterial materials, catalysts, electrode materials and the like.
The preparation method of nano silver can be divided into a physical method, a biological method and a chemical method. The physical method needs laser, electric arc high-frequency induction or electron beam irradiation and the like, the prepared nano silver material has high purity and controllable particle size, but the technology is complex, the chemical method mainly comprises a micro-emulsion method, a hydrothermal synthesis method, a chemical reduction method and the like, the chemical reduction method is widely used due to simple principle and convenient operation, reducing agents such as ascorbic acid, glucose and the like are weak in reducing property and are usually added in too much, sodium borohydride has excellent reducing property and is often used for preparing nano silver sol, and the applicant finds that the nano silver sol rich in boron element can be obtained after the preparation method. Boron is a trace element necessary for plant growth, 1-3 mg of boron can be taken by people from food and drinking water every day, but the excessive intake of boron and the excessive intake of boron in water can cause damage to crops and human bodies, and the long-term intake of excessive boron can cause great damage to the growth and development of the bodies and even endanger life. The limit value of boron in GB5749-2006 sanitary Standard for Drinking Water is 1mg/L. The existing preparation method of the low-boron-content nano silver sol mainly comprises a high-speed centrifugal washing or reverse osmosis method, has the defects of complex process, high cost, incomplete boron removal and the like, and urgently needs a method with low cost and good boron removal effect.
Based on the technical defects of high boron content and preparation method existing in the existing method for preparing nano silver sol by using borohydride reduction method, the method needs to be improved.
Disclosure of Invention
In view of the above, the present invention provides a stable low-boron nano silver sol and a preparation method thereof to solve or partially solve the problems in the prior art.
In a first aspect, the invention provides a stable low-boron nano-silver sol, which comprises silver nano-particles, a coating agent, boron and water;
wherein the concentration of the silver nano particles is 10-5000 mg/L;
the concentration of the coating agent is 10-50 times of that of the silver nano particles;
the concentration of boron is <1mg/L.
Preferably, the stable low-boron nano silver sol and the coating agent are polyvinylpyrrolidone.
Preferably, the stable low-boron nano silver sol has the particle size of 1-100 nm.
In a second aspect, the invention also provides a preparation method of the stable low-boron nano silver sol, which comprises the following steps:
mixing a coating agent with a soluble silver salt solution, then adding a reducing agent, and stirring to obtain initial nano silver sol;
adding boron adsorption resin into the initial nano silver sol, stirring, mixing, vibrating and adsorbing, and separating the boron adsorption resin to obtain stable low-boron nano silver sol;
the boron adsorption resin is ion exchange resin.
Preferably, the preparation method of the stable low-boron nano silver sol comprises at least one of silver acetate, silver nitrate and silver citrate.
Preferably, in the preparation method of the stable low-boron nano-silver sol, the reducing agent comprises at least one of sodium borohydride and potassium borohydride.
Preferably, in the preparation method of the stable low-boron nano silver sol, the mass ratio of the soluble silver salt to the reducing agent is 1 (4-6).
Preferably, in the preparation method of the stable low-boron nano silver sol, the mass of the coating agent is 10-50 times of that of silver ions in the soluble silver salt.
Preferably, in the preparation method of the stable low-boron nano silver sol, the coating agent is polyvinylpyrrolidone.
Preferably, the preparation method of the stable low-boron nano silver sol comprises the steps of adding boron adsorption resin into the initial nano silver sol, stirring for 20-30 h at 20-25 ℃, oscillating for adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano silver sol.
Compared with the prior art, the stable low-boron nano silver sol and the preparation method thereof have the following beneficial effects:
(1) According to the preparation method of the stable low-boron nano silver sol, the boron adsorption resin is ion exchange resin, a molecular chain of the boron adsorption resin contains a large amount of ortho hydroxyl, and the ion exchange resin is used as an adsorbent, so that some of the boron on the resin and boron in the nano silver sol are subjected to complexing reaction, the effect of adsorbing boron is achieved, the removal rate of boron is more than 98%, and the stability of the treated low-boron nano silver sol is remarkably improved; the preparation method of the stable low-boron nano silver sol has the characteristics of simple process, convenience and quickness in operation, environmental friendliness and the like, and is expected to achieve the effects of recycling boron and recycling the resin due to the reversibility of ion exchange.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a TEM image of the nano-silver sol obtained in step S6 of example 1 after boron removal;
fig. 2 is a TEM image of the initial nano silver sol obtained in step S5 of example 1.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the application provides a stable low-boron nano silver sol, which comprises silver nano particles, a coating agent, boron and water;
wherein, the concentration of the silver nano particles is 10-5000 mg/L;
the concentration of the coating agent is 10 to 50 times of that of the silver nano particles;
the concentration of boron is <1mg/L.
In some embodiments, the coating agent is polyvinylpyrrolidone.
In some embodiments, the silver nanoparticles have a particle size of 1 to 100nm.
The stable low-boron nano silver sol comprises silver nanoparticles, a coating agent, water and trace boron, wherein the boron content is less than 1mg/L; the low-boron nano silver sol is not changed after being stored at room temperature for 12 months.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the stable low-boron nano silver sol, which comprises the following steps:
s1, mixing a coating agent with a soluble silver salt solution, adding a reducing agent, and stirring to obtain initial nano silver sol;
s2, adding boron adsorption resin into the initial nano-silver sol, stirring, mixing, vibrating and adsorbing, and separating the boron adsorption resin to obtain stable low-boron nano-silver sol;
the boron adsorption resin is ion exchange resin.
According to the preparation method of the stable low-boron nano silver sol provided by the embodiment of the application, the boron adsorption resin is ion exchange resin, a molecular chain of the boron adsorption resin contains a large amount of ortho hydroxyl, the ion exchange resin is used as an adsorbent and is subjected to a complexing reaction with boron in the nano silver sol, so that the effect of adsorbing boron is achieved, the removal rate of boron is more than 98%, and the stability of the treated nano silver sol is remarkably improved; the preparation method of the stable low-boron nano silver sol has the characteristics of simple process, convenience and quickness in operation, environmental friendliness and the like, and is expected to achieve the effects of recycling boron and recycling the resin due to the reversibility of ion exchange.
In some embodiments, the soluble silver salt comprises at least one of silver acetate, silver nitrate, silver citrate.
In some embodiments, the reducing agent comprises at least one of sodium borohydride, potassium borohydride.
In some embodiments, the ratio of the amount of soluble silver salt to the amount of the reducing agent is 1 (4-6).
In some embodiments, the mass of the capping agent is 10 to 50 times the mass of the silver ions in the soluble silver salt.
In some embodiments, the coating agent is polyvinylpyrrolidone.
In some embodiments, the boron adsorption resin is added into the initial nano silver sol, stirred for 20-30 h at 20-25 ℃, and after shaking adsorption, the boron adsorption resin is separated to obtain the stable low-boron nano silver sol.
The preparation method of the stable low-boron nano silver sol of the present application is further described by specific examples below. This section further illustrates the present invention with reference to specific examples, which should not be construed as limiting the invention. The technical means employed in the examples are conventional means well known to those skilled in the art, unless otherwise specified. The reagents, methods and apparatus employed in the present invention are conventional in the art, except as otherwise indicated. The boron adsorbent resin used in the following examples was supplied by Wuhan-field Mass-materials science and technology, inc., under the brand No. BR200.
Example 1
The embodiment of the application provides a preparation method of stable low-boron nano silver sol, which comprises the following steps:
s1, weighing 2g of polyvinylpyrrolidone (PVP), dissolving in 100mL of distilled water, and stirring for 12min to obtain a coating agent solution;
s2, weighing 0.0325g of silver acetate, adding 100mL of distilled water, and stirring for 15min to obtain a silver acetate solution;
s3, mixing the coating agent solution obtained in the step S1 with the silver acetate solution obtained in the step S2, and stirring for 1 hour to obtain a mixed solution;
s4, weighing 0.0368g of sodium borohydride, adding 10mL of water, and stirring for 10min to obtain a reducing agent solution;
s5, adding the reducing agent solution obtained in the step S4 into the mixed solution obtained in the step S3, and stirring for 1 hour to obtain initial nano silver sol;
s6, taking 50mL of the nano-silver sol obtained in the step S5, adding 2g of boron adsorption resin into a plastic bottle, placing the plastic bottle in a constant-temperature oscillator, oscillating for 24 hours at 35 ℃, filtering the nano-silver sol after resin adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano-silver sol. It is calculated that the removal rate of boron after the step S6 is 94.6%.
Example 2
The embodiment of the application provides a preparation method of stable low-boron nano silver sol, which comprises the following steps:
s1, weighing 2g of polyvinylpyrrolidone (PVP), dissolving in 100mL of distilled water, and stirring for 12min to obtain a coating agent solution;
s2, weighing 0.0650g of silver acetate, adding 100mL of distilled water, and stirring for 15min to obtain a silver acetate solution;
s3, mixing the coating agent solution obtained in the step S1 with the silver acetate solution obtained in the step S2, and stirring for 1 hour to obtain a mixed solution;
s4, weighing 0.1049g of potassium borohydride, adding 10mL of water, and stirring for 10min to obtain a reducing agent solution;
s5, adding the reducing agent solution obtained in the step S4 into the mixed solution obtained in the step S3, and stirring for 1h to obtain initial nano silver sol;
s6, taking 50mL of the nano-silver sol obtained in the step S5, adding 2g of boron adsorption resin into a plastic bottle, placing the plastic bottle in a constant-temperature oscillator, oscillating for 24 hours at 35 ℃, filtering the nano-silver sol after resin adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano-silver sol. It is calculated that the removal rate of boron after the step S6 is 98.3%.
Example 3
The embodiment of the application provides a preparation method of stable low-boron nano silver sol, which comprises the following steps:
s1, weighing 3g of polyvinylpyrrolidone (PVP), dissolving in 100mL of distilled water, and stirring for 12min to obtain a coating agent solution;
s2, weighing 0.0975g of silver acetate, adding 100mL of distilled water, and stirring for 15min to obtain a silver acetate solution;
s3, mixing the coating agent solution obtained in the step S1 with the silver acetate solution obtained in the step S2, and stirring for 1 hour to obtain a mixed solution;
s4, weighing 0.1104g of sodium borohydride, adding 10mL of water, and stirring for 10min to obtain a reducing agent solution;
s5, adding the reducing agent solution obtained in the step S4 into the mixed solution obtained in the step S3, and stirring for 1h to obtain initial nano silver sol;
s6, taking 50mL of the nano-silver sol obtained in the step S5, adding 2g of boron adsorption resin into a plastic bottle, placing the plastic bottle in a constant-temperature oscillator, oscillating for 24 hours at 22 ℃, filtering the nano-silver sol after resin adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano-silver sol. It is calculated that the removal rate of boron after the step S6 is 96.6%.
Example 4
The embodiment of the application provides a preparation method of stable low-boron nano silver sol, which comprises the following steps:
s1, weighing 3g of polyvinylpyrrolidone (PVP), dissolving in 100mL of distilled water, and stirring for 12min to obtain a coating agent solution;
s2, weighing 0.1300g of silver acetate, adding 100mL of distilled water, and stirring for 15min to obtain a silver acetate solution;
s3, mixing the coating agent solution obtained in the step S1 with the silver acetate solution obtained in the step S2, and stirring for 1 hour to obtain a mixed solution;
s4, weighing 0.1472g of sodium borohydride, adding 10mL of water, and stirring for 10min to obtain a reducing agent solution;
s5, adding the reducing agent solution obtained in the step S4 into the mixed solution obtained in the step S3, and stirring for 1h to obtain initial nano silver sol;
s6, taking 50mL of the nano silver sol obtained in the step S5, adding 2g of boron adsorption resin into a plastic bottle, placing the plastic bottle in a constant-temperature oscillator, oscillating for 24 hours at 22 ℃, filtering the nano silver sol after resin adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano silver sol. It is calculated that the removal rate of boron after the step S6 is 95.6%.
Example 5
The embodiment of the application provides a preparation method of stable low-boron nano silver sol, which comprises the following steps:
s1, weighing 2g of polyvinylpyrrolidone (PVP), dissolving in 100mL of distilled water, and stirring for 12min to obtain a coating agent solution;
s2, weighing 0.0325g of silver acetate, adding 100mL of distilled water, and stirring for 15min to obtain a silver acetate solution;
s3, mixing the coating agent solution obtained in the step S1 with the silver acetate solution obtained in the step S2, and stirring for 1 hour to obtain a mixed solution;
s4, weighing 0.0368g of sodium borohydride, adding 10mL of water, and stirring for 10min to obtain a reducing agent solution;
s5, adding the reducing agent solution obtained in the step S4 into the mixed solution obtained in the step S3, and stirring for 1h to obtain initial nano silver sol;
s6, taking 50mL of the nano-silver sol obtained in the step S5, adding 2g of boron adsorption resin into a plastic bottle, placing the plastic bottle in a constant-temperature oscillator, oscillating for 24 hours at 35 ℃, filtering the nano-silver sol after resin adsorption, and separating the boron adsorption resin to obtain the stable low-boron nano-silver sol. It is calculated that the removal rate of boron after the step S6 is 94.6%.
Example 1 TEM images of the stable low-boron nanosilver sol obtained in step S6 and the initial nanosilver sol obtained in step S5 are shown in fig. 1 to 2, respectively. It can be seen from fig. 1 that the dispersibility of silver particles in the nano silver sol is better after boron adsorption and boron removal by the boron adsorption resin, and the adsorption and boron removal has no influence on the particle size and the morphology of the nano silver.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The stable low-boron nano silver sol is characterized by comprising silver nano particles, a coating agent, boron and water;
wherein the concentration of the silver nano particles is 10-5000 mg/L;
the concentration of the coating agent is 10-50 times of that of the silver nano particles;
the concentration of boron is <1mg/L.
2. The stable, low-boron nanosilver sol of claim 1, wherein the capping agent is polyvinylpyrrolidone.
3. The stable, low-boron nanosilver sol of claim 1, wherein the silver nanoparticles have a particle size of 1 to 100nm.
4. A preparation method of stable low-boron nano silver sol is characterized by comprising the following steps:
mixing a coating agent with a soluble silver salt solution, then adding a reducing agent, and stirring to obtain initial nano silver sol;
adding boron adsorption resin into the initial nano silver sol, stirring, mixing, vibrating and adsorbing, and separating the boron adsorption resin to obtain stable low-boron nano silver sol;
the boron adsorption resin is ion exchange resin.
5. The method of claim 4, wherein the soluble silver salt comprises at least one of silver acetate, silver nitrate, and silver citrate.
6. The method of claim 4, wherein the reducing agent comprises at least one of sodium borohydride and potassium borohydride.
7. The method of claim 4, wherein the ratio of the soluble silver salt to the reducing agent is 1 (4-6).
8. The method of claim 4, wherein the mass of the coating agent is 10-50 times of the mass of the silver ions in the soluble silver salt.
9. The method of preparing the stable low-boron nanosilver sol of claim 4, wherein the capping agent is polyvinylpyrrolidone.
10. The method for preparing stable low-boron nano-silver sol according to claim 4, wherein the stable low-boron nano-silver sol is obtained by adding boron adsorption resin into the initial nano-silver sol, stirring for 20-30 h at 20-25 ℃, shaking for adsorption, and separating the boron adsorption resin.
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| CN202210994671.9A CN115338400A (en) | 2022-08-18 | 2022-08-18 | Stable low-boron nano silver sol and preparation method thereof |
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| CN114682229A (en) * | 2022-03-29 | 2022-07-01 | 西安蓝深新材料科技有限公司 | Boron adsorption resin and preparation method and application thereof |
| CN114734049A (en) * | 2022-03-14 | 2022-07-12 | 上海大学 | Method for preparing ultra-small nano silver by using sodium borohydride |
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