CN113498790A - Functional group immobilized nano-silver material, and preparation method and application thereof - Google Patents
Functional group immobilized nano-silver material, and preparation method and application thereof Download PDFInfo
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- CN113498790A CN113498790A CN202110751394.4A CN202110751394A CN113498790A CN 113498790 A CN113498790 A CN 113498790A CN 202110751394 A CN202110751394 A CN 202110751394A CN 113498790 A CN113498790 A CN 113498790A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
- A01N25/10—Macromolecular compounds
Abstract
The invention discloses a functional group immobilized nano-silver material, a preparation method and application thereof, and belongs to the technical field of silver composite materials. The preparation method comprises the following steps: after the macroporous resin is subjected to ultrasonic treatment by using deionized water, adding an auxiliary agent to modify functional groups of the macroporous resin; weighing the treated macroporous resin, adding AgNO3Carrying out ultrasonic impregnation on the macroporous resin by using the solution or the HCOOAg solution to obtain a first mixture; dropwise adding a precipitator into the mixture I obtained in the step 2, filtering to obtain a precipitation product, placing the precipitation product into any one of an ascorbic acid solution, a dopamine solution and a sodium borohydride solution for reduction reaction to obtain a mixture II, and crushing the mixture II into colloidA solution; drying the colloidal solution in vacuum or directly using the colloidal solution as the nano silver material.
Description
Technical Field
The invention relates to a functional group immobilized nano-silver material, a preparation method and application thereof, belonging to the technical field of silver composite materials.
Background
In human production and life, microorganisms have both beneficial and harmful aspects. The harm of microorganisms is mainly shown as pathogenic bacteria, disinfection and antibiosis in production and life are the basis of health and safety, and the silver as the antibacterial material has the effects of natural sterilization, disinfection, mildew prevention and the like, and has the advantages of simple preparation, strong antibacterial effect, wide antibacterial spectrum and the like compared with organic antibacterial materials.
Although a great deal of research and application are carried out on silver antibacterial materials at present, the silver antibacterial materials also have certain limitations in the aspects of preparation process, cost, storage, environmental protection and the like: (1) the preparation process is complex, so that the preparation cost is high; (2) the nano particle material occupying the mainstream in the silver antibacterial material has the defects of easy agglomeration and the like due to the self microstructure, so that the specific surface area is reduced, and the reactivity is lost; (3) when the silver antibacterial material is stable in reduction, a certain amount of reducing agent, cross-linking agent, stabilizing agent and dispersing agent are needed for the silver precursor, and the method is not in accordance with the concepts of no toxicity, environmental friendliness and the like; (4) the silver-based antibacterial material is usually washed when being applied to the field of life, and the loss degree of the silver-based antibacterial material in washing is different according to the difference of load strength, so that the antibacterial performance is greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a functional group immobilized nano-silver material, a preparation method and application thereof.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a preparation method of a functional group-immobilized nano-silver material comprises the following steps:
1) after the macroporous resin is subjected to ultrasonic treatment by using deionized water, adding an auxiliary agent to modify functional groups of the macroporous resin;
2) weighing the treated macroporous resin, adding AgNO3Carrying out ultrasonic impregnation on the macroporous resin by using the solution or the HCOOAg solution to obtain a first mixture;
3) and (3) dropwise adding a precipitator into the mixture I in the step (2), filtering to obtain a precipitation product, placing the precipitation product into any one of an ascorbic acid solution, a dopamine solution and a sodium borohydride solution for reduction reaction to obtain a mixture II, and crushing the mixture II into a colloidal solution.
4) Drying the colloidal solution in vacuum or directly using the colloidal solution as the nano silver material.
As a preferable example, the auxiliary agent in the above step 1 includes any one of 0.2 to 2.0 equivalents/liter of an imido acetoacetic acid functional group, an amino phosphate functional group, an amidoxime group, an amidohydrazone group, a guanidine group, a benzylamino group, a polyglycine group, diethanolamine, ethylenediamine, diethylenetriamine, triethylene tetramine, 2-aminobenzothiazole, aminothiazole, 4-aminotriazole, 8-aminoquinoline, a mercapto functional group, dithizone, thiol, thiomethyl, thiourea, a dithioamino group, a carboxyl group, and salicylhydrazine.
As a preferable example, the modification of the functional group in step 1 is carried out by chelating the auxiliary agent with a functional group inherent to the macroporous resin, such as a sulfonic acid group, an acetic acid group, a fluoric acid group, etc.
As a preferred example, AgNO used in the above step 23The ratio of the solution or HCOOAg solution to the macroporous resin is 0.2-2 mmol: 1g of the total weight of the composition.
As a preferred example, the precipitant used in the above step 3 is Na2HPO4。
As a preferable example, the ratio of the precipitating agent to the first mixture in the step 3 is 0.2-2 g: 1g of the total weight of the composition.
As a preferable example, the ratio of the ascorbic acid solution to the resin in the above step 3 is 0.001 to 0.1 mmol: 1g of the total weight of the composition.
As a preferable example, the reduction reaction time in the step 3 is 2 to 20 hours.
The nano silver material obtained by the preparation method.
In the technical scheme, the particle size of the nano-silver material is 0.05-5 mm, and the specific surface area of the material is 100-1300 m2/g。
The nano silver material is applied as an antibacterial material, and the colloidal solution obtained by the preparation method is coated on the surface of a textile, or a plastic antibacterial product prepared by adopting a mode of blending the colloidal solution.
The invention has the beneficial effects that:
(1) according to the invention, the functional group modification mode is adopted to chelate silver, so that the silver content in the material is in a better range, and the antibacterial property of the material is greatly improved; the elution of silver particles is inhibited, the antibacterial capability and the service life of an antibacterial product prepared from the silver-loaded material are improved, and the synthesis method is optimized, so that the influence on the environment is small;
(2) the precursor of the silver-loaded antibacterial material is a colloidal solution, and compared with a solid material, the colloidal solution can improve the dispersibility of silver-loaded antibacterial particles, so that the killing capability on bacteria and viruses is improved, and the silver-loaded antibacterial material has the advantages of higher application flexibility, wider application range and stronger application effect in antibacterial products.
Drawings
FIG. 1 is a graph showing the antibacterial test effect on staphylococcus S.a and Escherichia coli E.c before and after modification of the material prepared by the present invention;
FIG. 2 is a graph showing the inhibitory effect of the leachate of the preparation material of the present invention on E.coli E.c and Staphylococcus S.a.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1:
weighing 6-8 g of macroporous resin, carrying out ultrasonic treatment by deionized water, adding 100mL of imido-acetoacetic acid for reaction for four hours, carrying out functional group modification, cleaning, filtering, and placing in 100mL of AgNO with the concentration of 2%3In an aqueous solution (0.12 mol/L); 100mL of 0.1M Na was added dropwise2HPO4Stirring the solution for two hours; reducing in ascorbic acid solution for 2 hr, mixing 5mM ascorbic acid with 20mL water, filtering to remove solution, pulverizing the particles into colloidal solution, vacuum drying to obtain silver-carrying antibacterial material, or directly making into antibacterial product with colloidal solutionTextile prepared by coating colloidal solution, such as mask; or plastic products made by blending colloidal solution.
FIG. 1 is a graph showing the antibacterial effect of the silver-loaded antibacterial material prepared in this example on staphylococcus (gram-positive bacteria) and escherichia coli (gram-negative bacteria) before and after modification. The staphylococcus S.a and Escherichia coli E.c strain are taken out from refrigerator at-60 deg.C, and pre-cultured for activation. Inoculating the activated bacterial liquid into an agar culture dish by a plate streaking method, and checking the growth and purity of bacteria by the colony morphology after incubation. Thereafter, single colonies were picked and transferred to LB medium, and incubated at 180rpm and 37 ℃. The culture solution of the bacteria incubated with the growth logarithmic phase was diluted and transferred to LB medium containing the material (1000mg/L) so that the initial OD600 of the bacteria solution in the culture solution of the material was 0.05. The growth of bacteria was measured by measuring the OD600 and the inhibitory effect on the growth of bacteria before and after modification of the material was determined, and the control group was LB medium without the material added.
As can be seen from FIG. 1, the material before modification has no antibacterial ability, and the growth curves of Escherichia coli and Staphylococcus aureus and the control group have no difference within the experimental error range. The modified antibacterial material has good antibacterial ability and strong inhibition effect on bacterial growth.
Fig. 2 is a graph showing the inhibitory effect of the leachate of the silver-loaded antibacterial material prepared in this example, i.e. escherichia coli e.c and staphylococcus S.a, and the antibacterial ability of the material was evaluated by measuring the diameter of the bacterial diffusion inhibition zone by the disc diffusion method. As can be seen from fig. 2, the leachate of the silver-loaded antimicrobial material showed no bacteriostatic ability, indicating that the silver particles were firmly anchored in the material and were not lost after washing with water.
Example 2: different from the assistant for modifying functional groups in example 1
Weighing 6-8 g of macroporous resin, performing ultrasonic treatment, adding 100mL of triethylene tetramine, reacting for four hours, performing functional group modification, cleaning, filtering, and placing in 50mL of AgNO with the concentration of 2%3In an aqueous solution (0.12 Mmol/L); 100ml of 0.1M Na are added dropwise2HPO4Stirring the solution for two hours; then reduced in Ascorbic Acid (AA) (5mM,20mL water)Crushing the mixture into colloidal solution for 3 hours; vacuum drying to obtain the silver-carrying antibacterial material.
Example 3: different from the assistant for modifying functional groups in example 1
Weighing 6-8 g of macroporous resin, carrying out ultrasonic treatment, adding 100mL of diethanolamine to react for four hours, carrying out functional group modification, cleaning, filtering, and placing in 50mL of 2% AgNO3In an aqueous solution (0.12 Mmol/L); 100mL of 0.1M Na was added dropwise2HPO4Stirring the solution for two hours; then reducing in Ascorbic Acid (AA) (5mM,20mL water) for 2h, and pulverizing into colloidal solution; vacuum drying to obtain the silver-carrying antibacterial material.
Example 4: different from the reducing agent and the reduction time in example 2
Weighing 6-8 g of macroporous resin, performing ultrasonic treatment, adding 100mL of triethylene tetramine, reacting for four hours, performing functional group modification, cleaning, filtering, and placing in 50mL of AgNO with the concentration of 2%3In an aqueous solution (0.12 Mmol/L); 100ml of 0.1M Na are added dropwise2HPO4Stirring the solution for two hours; then reducing in dopamine aqueous solution (5mM,20mL water) for 2h, and crushing into colloidal solution; vacuum drying to obtain the silver-carrying antibacterial material.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A preparation method of a functional group-immobilized nano-silver material is characterized by comprising the following steps:
1) after the macroporous resin is subjected to ultrasonic treatment by using deionized water, adding an auxiliary agent to modify functional groups of the macroporous resin;
2) weighing the treated macroporous resin, adding AgNO3Ultrasonic impregnating macroporous resin with solution or HCOOAg solutionObtaining a first mixture;
3) dropwise adding a precipitator into the mixture I obtained in the step 2, filtering to obtain a precipitation product, placing the precipitation product into any one of an ascorbic acid solution, a dopamine solution and a sodium borohydride solution for reduction reaction to obtain a mixture II, and crushing the mixture II into a colloidal solution;
4) drying the colloidal solution in vacuum or directly using the colloidal solution as the nano silver material.
2. The method for preparing the functional group-supported nano-silver material according to claim 1, wherein the auxiliary agent in step 1 comprises 0.2-2.0 equivalent/liter of any one of an imido acetoacetic acid functional group, an amino phosphate functional group, an amidoxime group, an amidohydrazone group, a guanidine group, a benzylamino group, a polyglycin group, diethanolamine, ethylenediamine, diethylenetriamine, triethylene tetramine, triethylenetetramine, 2-aminobenzothiazole, aminothiazole, 4-aminotriazole, 8-aminoquinoline, a mercapto functional group, dithizone, thiol, a thiomethyl, thiourea, a dithioamino, a carboxyl group, and salicylhydrazine.
3. The method for preparing the functional group-supported nano silver material according to claim 1, wherein the modification of the functional group in step 1 is performed by chelating the auxiliary agent with the macroporous resin.
4. The method for preparing the functional group-supported nano silver material according to claim 1, wherein AgNO used in the step 23The ratio of the solution or HCOOAg solution to the macroporous resin is 0.2-2 mmol: 1g of the total weight of the composition.
5. The method for preparing the functional group-supported nano-silver material according to claim 1, wherein the precipitating agent used in the step 3 is Na2HPO4。
6. The method for preparing the functional group-supported nano silver material according to claim 1, wherein the ratio of the precipitating agent to the first mixture in the step 3 is 0.2-2 g: 1g of the total weight of the composition.
7. The method for preparing the functional group-supported nano silver material according to claim 1, wherein the ratio of the ascorbic acid solution to the resin in the step 3 is 0.001-0.1 mmol: 1g of the total weight of the composition.
8. The method for preparing the functional group-supported nano-silver material according to claim 1, wherein the reduction reaction time in the step 3 is 2-20 hours.
9. The nanosilver material obtained in the production method according to any one of claims 1 to 8.
10. Use of a nanosilver material as claimed in claim 9 as an antibacterial material.
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