CN112314624A - Preparation method and application of silver-silicon antibacterial composite material - Google Patents
Preparation method and application of silver-silicon antibacterial composite material Download PDFInfo
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- CN112314624A CN112314624A CN202011216092.9A CN202011216092A CN112314624A CN 112314624 A CN112314624 A CN 112314624A CN 202011216092 A CN202011216092 A CN 202011216092A CN 112314624 A CN112314624 A CN 112314624A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
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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
Abstract
The invention relates to a preparation method of a silver-silicon antibacterial composite material, which comprises a vacuum feeding machine, a discharge hole of the vacuum feeding machine, a powder conveying pipeline, a feed inlet of a transition bin, the transition bin, a discharge hole of the transition bin, a spiral belt mixer, a longitudinal solution conveying pipeline, a solution nozzle, a transverse solution conveying pipeline, a solution conveying bent pipe, a liquid storage tank, a light source, a discharge hole of the mixer, a storage bin, a mixer bracket and a moving wheel. The method has the advantages of simple preparation process, low process energy consumption, no need of adding additional reducing agent and no silver ion precipitation. The composite material has a removal rate of 99% to total amount of escherichia coli, staphylococcus aureus and bacterial colonies and the like, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to a preparation method of a silver-silicon antibacterial composite material.
Background
As the most commonly used inorganic antibacterial agent, the nano-silver has the advantages of high efficiency, safety, wide antibacterial spectrum and the like, so that the nano-silver is widely applied to antibacterial and mildewproof products. Meanwhile, the nano silver has high bactericidal selectivity and stronger biocompatibility, and has no harm to host cells, thereby becoming a hot spot of current scientific research. However, the problems of poor dispersibility of nano silver, difficulty in realizing large-scale preparation and the like are still huge challenges faced by the practical antibacterial application of the nano silver. At present, the preparation method of nano silver mostly adopts a wet method, namely, reducing silver nitrate in an aqueous solution by using a reducing agent such as sodium borohydride, citric acid, ascorbic acid and the like to obtain a colloidal solution of nano silver, but in practical application, an antibacterial powder material is mainly used, and the use of the colloidal solution is limited, so researchers further adopt a carrier to load nano silver to obtain a powder material, mainly adopt zirconium phosphate, active carbon, high molecules and the like as the carrier, still adopt a wet method for synthesis, adsorb the silver nitrate on the carrier in the aqueous solution, reduce the silver nitrate into the nano silver by using a reducing agent such as sodium borohydride, citric acid, ascorbic acid and the like, after the reduction in the aqueous solution, the load of the carrier on the nano silver is very low, the nano silver is aggregated, the dispersibility is poor, the nano silver is easy to fall off from the carrier, the antibacterial stability and the persistence are not ideal, and the high-efficiency antibacterial performance is, in addition, the synthesis process is complex and costly, and mass production is difficult to achieve.
Disclosure of Invention
The invention aims to provide a preparation method of a silver-silicon antibacterial composite material aiming at the defects of the existing synthetic nano silver, the device related to the method consists of a vacuum feeding machine, a discharge hole of the vacuum feeding machine, a powder conveying pipeline, a transition bin feed inlet, a transition bin, a discharge hole of the transition bin, a spiral belt mixer, a longitudinal solution conveying pipeline, a solution nozzle, a transverse solution conveying pipeline, a solution conveying bent pipe, a liquid storage tank, a light source, a discharge hole of the mixer, a storage bin, a mixer bracket and a moving wheel, adopts a dry method or a semi-dry method, using semiconductor monocrystalline silicon or polycrystalline silicon as a carrier, spraying silver nitrate on the silicon carrier to obtain semi-dry powder, the light is used as an external field, carriers, namely electron and hole pairs, are generated under the action of light by means of semiconductor silicon, and the silver nitrate captures electrons in the carriers to reduce silver ions into nano silver, so that the high-efficiency loading of the nano silver is realized. The method has the advantages of simple preparation process, low process energy consumption, no need of adding additional reducing agent and no silver ion precipitation. The composite material has a removal rate of 99% to total amount of escherichia coli, staphylococcus aureus and bacterial colonies and the like, and is suitable for large-scale industrial production.
The invention relates to a preparation method of a silver-silicon antibacterial composite material, which comprises a vacuum feeding machine (1), a discharge hole (2) of the vacuum feeding machine, a powder conveying pipeline (3), a transition bin feed inlet (4), a transition bin (5), a transition bin discharge hole (6), a spiral belt mixer (7), a longitudinal solution conveying pipeline (8), a solution nozzle (9), a transverse solution conveying pipeline (10), a solution conveying elbow (11), a liquid storage tank (12), a spiral belt (13), an ultraviolet light source, a simulated solar light source (14), a mixer discharge hole (15), a bin (16), a mixer bracket (17) and a moving wheel (18), wherein the bottom of the vacuum feeding machine (1) is provided with the discharge hole (2) of the vacuum feeding machine, and the discharge hole (2) of the vacuum feeding machine is connected with one end of the powder conveying pipeline (3), the other end of the powder conveying pipeline (3) is connected with a transition bin feed inlet (4), the transition bin feed inlet (4) is positioned at the top of a transition bin (5), a transition bin discharge outlet (6) at the bottom of the transition bin (5) is connected with a ribbon blender mixer (7), a plurality of longitudinal solution conveying pipelines (8) which are equally arranged are arranged at the top of the ribbon blender mixer (7), solution nozzles (9) are respectively arranged on the longitudinal solution conveying pipelines (8), the longitudinal solution conveying pipelines (8) are connected with a transverse solution conveying pipeline (10), the transverse solution conveying pipeline (10) is connected with a liquid storage tank (12) through a solution conveying elbow (11), a ribbon (13) is arranged in the ribbon blender mixer (7), an ultraviolet light source and a simulated solar light source (14) are respectively arranged on a hexahedron the ribbon blender mixer (7), a discharge outlet (15) is arranged at the bottom of the ribbon blender mixer (7), the discharge port (15) is connected with the stock bin (16), the bottom of the ribbon blender (7) is respectively provided with a bracket (17) with a movable wheel (18), the ribbon blender (7) is made of quartz or glass, and the concrete operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing the elemental silicon with the crystal form with the particle size of 0.5-5cm, ball-milling for 24-48 hours by using a ball mill, and sieving by using a sieve of 150 meshes and 200 meshes to obtain silicon powder, wherein the elemental silicon is monocrystalline silicon, polycrystalline silicon or amorphous silicon;
preparing a silver nitrate solution:
b. dissolving 0.02-0.32kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, conveying the silicon powder ground in the step a into a ribbon blender mixer (7) through a vacuum feeding machine (1), a discharge hole (2) of the vacuum feeding machine, a powder conveying pipeline (3), a feed hole (4) of a transition bin, a transition bin (5) and a discharge hole (6) of the transition bin, then starting a stirring ribbon (13) to enable the silicon powder to be continuously stirred in the ribbon blender mixer (7), then adding the prepared silver nitrate aqueous solution obtained in the step b into a liquid storage tank (12), spraying the silver nitrate aqueous solution into the silicon powder in the ribbon blender mixer (7) through a solution conveying bent pipe (11), a transverse solution conveying pipeline (10), a longitudinal solution conveying pipeline (8) and a solution nozzle (9), stirring for 2 hours to obtain semi-dry silicon powder loaded with silver ions, then starting an ultraviolet light source and a simulated solar light source (14) on a hexahedron the ribbon blender mixer (7), and irradiating and stirring at a high speed under the ultraviolet light source and the simulated solar light source (14), reacting for 1-5 hours, transferring the half-dried silicon powder into a storage bin (16) through a discharge hole (15) after the reaction is finished, transferring the silicon powder into a drying box from a storage bin (6), and drying at the temperature of 50-100 ℃ to obtain the silver-silicon antibacterial composite material.
And c, mixing the silver nitrate aqueous solution with the silicon powder in a spraying manner according to the mass ratio of 0.001-0.1: 0.5-1.
The silver-silicon antibacterial composite material obtained by the method is used for preparing and removing escherichia coli and staphylococcus aureus simultaneously.
The silver-silicon antibacterial composite material obtained by the method has the removal rate of 99 percent on total number of escherichia coli, staphylococcus aureus and bacterial colonies. The preparation method of the composite material is simple, convenient to operate, environment-friendly, safe, free of additional pollutants, long in antibacterial life, low in energy consumption and suitable for large-scale industrial production.
The silver-silicon antibacterial composite material obtained by the method has obvious characteristic peaks of simple substance silver and simple substance silicon and plasma effect of nano silver by adopting ultraviolet visible diffuse reflection, XRD, infrared and Raman spectrum tests. The actual silver loading and antibacterial performance in the examples and comparative examples are shown in tables 1 and 2, and the silver-silicon antibacterial composite material obtained has higher silver loading and better antibacterial performance.
The preparation method of the silver-silicon antibacterial composite material, which is disclosed by the invention, has the advantages that the simple substance silicon is used as a carrier: (1) indirect reducing agent under assistance of light, and (2) high stability and safety.
Drawings
FIG. 1 is a schematic diagram of a preparation route of a silver-silicon composite material according to the present invention;
fig. 2 is a raman spectrum of the silver-silicon composite material of the present invention;
fig. 3 is a diagram of an apparatus for producing a silver-silicon composite material according to the present invention.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to the following examples, but the present invention is not limited to the examples.
Example 1
The invention relates to a preparation method of a silver-silicon antibacterial composite material, which comprises a vacuum feeding machine 1, a vacuum feeding machine discharge port 2, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5, a transition bin discharge port 6, a ribbon blender 7, a longitudinal solution conveying pipeline 8, a solution nozzle 9, a transverse solution conveying pipeline 10, a solution conveying elbow 11, a liquid storage tank 12, a ribbon 13, an ultraviolet light source and simulated solar light source 14, a blender discharge port 15, a storage bin 16, a blender support 17 and a moving wheel 18, wherein the vacuum feeding machine discharge port 2 is arranged at the bottom of the vacuum feeding machine 1, the vacuum feeding machine discharge port 2 is connected with one end of the powder conveying pipeline 3, the other end of the powder conveying pipeline 3 is connected with the transition bin feed port 4, the transition bin feed port 4 is positioned at the top of the transition bin 5, the bottom of the transition bin 5 is connected with the ribbon blender 7 through the transition bin discharge port 6, the top of the ribbon blender mixer 7 is provided with a plurality of longitudinal solution conveying pipelines 8 which are arranged equally, solution nozzles 9 are respectively arranged on the longitudinal solution conveying pipelines 8, the longitudinal solution conveying pipelines 8 are connected with a transverse solution conveying pipeline 10, the transverse solution conveying pipeline 10 is connected with a liquid storage tank 12 through a solution conveying bent pipe 11, ribbons 13 are arranged in the ribbon blender mixer 7, an ultraviolet light source and a simulated solar light source 14 are respectively arranged on a hexahedron of the ribbon blender mixer 7, a discharge port 15 is arranged at the bottom of the ribbon blender mixer 7, the discharge port 15 is connected with a storage bin 16, a support 17 with a movable wheel 18 is respectively arranged at the bottom of the ribbon blender mixer 7, the ribbon blender mixer 7 is made of quartz or glass, and the concrete operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing 5kg of monocrystalline silicon with a crystal form grain size of 0.5cm, ball-milling for 24 hours by using a ball mill, and sieving by using a sieve of 150 meshes to obtain monocrystalline silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.02kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. placing 5kg of the monocrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the monocrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, then starting a stirring ribbon 13 to enable the monocrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.02kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the monocrystalline silicon powder in the ribbon mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry monocrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, then transferring the semi-dry monocrystalline silicon powder into a storage bin 16 through a discharge port, and then the silver-silicon antibacterial composite material is transferred into a drying oven from a storage bin (16) and dried at the temperature of 50 ℃ to obtain the silver-silicon antibacterial composite material.
Example 2
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing 5kg of monocrystalline silicon with crystal form and particle size of 1cm, ball-milling for 36 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.04kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the monocrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the monocrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, then starting a stirring ribbon 13 to enable the monocrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.04kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the monocrystalline silicon powder in the ribbon mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry monocrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, and reacting for 1 hour under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the semi-dry monocrystalline silicon powder into a bin 16 through a discharge hole 15, transferring the semi-dry monocrystalline silicon powder into a drying oven from the bin 16, and drying at the temperature of 8 ℃ to obtain the silver-silicon antibacterial composite material.
Example 3
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing 5kg of monocrystalline silicon with crystal form and particle size of 2cm, ball-milling for 48 hours by using a ball mill, and sieving by using a 150-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.08kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the monocrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the monocrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the monocrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.08kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the monocrystalline silicon powder in the ribbon mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 3 hours under the irradiation of the ultraviolet light source and the simulated solar light source 14 and high-speed stirring, transferring the semi-dry monocrystalline silicon powder into a storage bin 16 through a discharge port, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 60 ℃ to obtain the silver-silicon antibacterial composite material.
Example 4
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing 5kg of monocrystalline silicon with crystal form and 3cm in particle size, ball-milling for 40 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.16kg of silver nitrate in water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the monocrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the monocrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed inlet 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the monocrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.16kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the monocrystalline silicon powder in the ribbon mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry monocrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 4 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry monocrystalline silicon powder into a storage bin 16 through a discharge port, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 70 ℃ to obtain the silver-silicon antibacterial composite material.
Example 5
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing 5kg of monocrystalline silicon with crystal form and particle size of 4cm, ball-milling for 30 hours by using a ball mill, and sieving by using a 180-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.32kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the monocrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the monocrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the monocrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.32kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the monocrystalline silicon powder in the ribbon mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry monocrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry monocrystalline silicon powder into a storage bin 16 through a discharge port, and then the silver-silicon antibacterial composite material is transferred into a drying oven from a storage bin 16 and dried at the temperature of 100 ℃ to obtain the silver-silicon antibacterial composite material.
Example 6
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing polycrystalline silicon powder:
a. crushing 5kg of polycrystalline silicon with crystal form and particle size of 5cm, ball-milling for 24 hours by using a ball mill, and sieving by using a 150-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.02kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the ground polycrystalline silicon powder in the step a into a vacuum feeding machine 1, conveying the polycrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to stir the polycrystalline silicon powder in the ribbon mixer 7 continuously, adding 2.02kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the polycrystalline silicon powder in the ribbon mixer 7 through a solution conveying bent pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry polycrystalline silicon powder loaded with silver ions, starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 1.5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry polycrystalline silicon powder into a storage bin 16 through a discharge port 15, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 55 ℃ to obtain the silver-silicon antibacterial composite material.
Example 7
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing polycrystalline silicon powder:
a. crushing 5kg of polycrystalline silicon with crystal form and particle size of 0.8cm, ball-milling for 28 hours by using a ball mill, and sieving by using a 180-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.04kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of polycrystalline silicon powder ground in the step a in a vacuum feeding machine 1, conveying the polycrystalline silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed inlet 4 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the polycrystalline silicon powder to be continuously stirred in the ribbon blender mixer 7, then adding 2.04kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the polycrystalline silicon powder in the ribbon blender mixer 7 through a solution conveying bent pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry polycrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, reacting for 2 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry polycrystalline silicon powder into a storage bin 16 through a discharge port 15, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 60 ℃ to obtain the silver-silicon antibacterial composite material.
Example 8
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing polycrystalline silicon powder:
a. crushing 5kg of polycrystalline silicon with crystal form and particle size of 1.5cm, ball-milling for 30 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. 0.08kg of silver nitrate is weighed and dissolved by 2kg of pure water to obtain silver nitrate water solution.
Synthesizing a silver-silicon composite material:
c. b, placing 5kg of polycrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the polycrystalline silicon powder into a spiral mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring spiral belt 13 to continuously stir the specular silicon powder in the spiral mixer 7, then adding 2.08kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the polycrystalline silicon powder in the spiral mixer 7 through a solution conveying bent pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry polycrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the spiral mixer 7, reacting for 3 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry polycrystalline silicon powder into a storage bin 16 through a discharge port 15, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 75 ℃ to obtain the silver-silicon antibacterial composite material.
Example 9
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing polycrystalline silicon powder:
a. crushing 5kg of polycrystalline silicon with crystal silicon and with the grain size of 3cm, ball-milling the crushed polycrystalline silicon for 36 hours by using a ball mill, and sieving the crushed polycrystalline silicon with a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.16kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of polycrystalline silicon powder ground in the step a in a vacuum feeding machine 1, conveying the polycrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the polycrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.16kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the polycrystalline silicon powder in the ribbon mixer 7 through a solution conveying bent pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry polycrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 4.5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry polycrystalline silicon powder into a storage bin 16 through a discharge port 15, and then transferring the silver-silicon antibacterial composite material from the storage bin 16 into a drying oven, and drying at the temperature of 85 ℃ to obtain the silver-silicon antibacterial composite material.
Example 10
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing polycrystalline silicon powder:
a. crushing 5kg of polycrystalline silicon with a crystal form grain size of 5cm, ball-milling for 48 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.32kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of polycrystalline silicon powder ground in the step a into a vacuum feeding machine 1, conveying the polycrystalline silicon powder into a ribbon mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a transition bin feed port 4, a transition bin 5 and a transition bin discharge port 6, starting a stirring ribbon 13 to enable the polycrystalline silicon powder to be continuously stirred in the ribbon mixer 7, then adding 2.32kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the polycrystalline silicon powder in the ribbon mixer 7 through a solution conveying bent pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry polycrystalline silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon mixer 7, reacting for 5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, transferring the semi-dry polycrystalline silicon powder into a storage bin 16 through a discharge port 15, and then the silver-silicon antibacterial composite material is transferred into a drying oven from a storage bin 16 and dried at the temperature of 100 ℃ to obtain the silver-silicon antibacterial composite material.
Example 11
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing amorphous silicon powder:
a. crushing 5kg of amorphous silicon with a crystal form and a particle size of 0.5cm, ball-milling the crushed amorphous silicon for 24 hours by using a ball mill, and sieving the crushed amorphous silicon with a sieve of 150 meshes to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.02kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. placing 5kg of the amorphous silicon powder ground in the step a into a vacuum feeding machine 1, conveying the amorphous silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a feed port 4 of a transition bin, a transition bin 5 and a discharge port 6 of the transition bin, starting a stirring ribbon 13 to continuously stir the amorphous silicon powder in the ribbon blender mixer 7, then adding 2.02kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the amorphous silicon powder in the ribbon blender mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry amorphous silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, and reacting for 1 hour under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the half-dried amorphous silicon powder into a bin 16 through a discharge port 15, transferring the half-dried amorphous silicon powder into a drying oven from the bin 16, and drying at the temperature of 50 ℃ to obtain the silver-silicon antibacterial composite material.
Example 12
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing amorphous silicon powder:
a. crushing 5kg of amorphous silicon with crystal form and particle size of 3cm, ball-milling for 36 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.04kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the amorphous silicon powder ground in the step a into a vacuum feeding machine 1, conveying the amorphous silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a feed port 4 of a transition bin, a transition bin 5 and a discharge port 6 of the transition bin, starting a stirring ribbon 13 to continuously stir the amorphous silicon powder in the ribbon blender mixer 7, then adding 2.04kg of silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the amorphous silicon powder in the ribbon blender mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry amorphous silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, and reacting for 2 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the semi-dry amorphous silicon powder into a bin 16 through a discharge port 15, transferring the semi-dry amorphous silicon powder into a drying oven from the bin 16, and drying at the temperature of 75 ℃ to obtain the silver-silicon antibacterial composite material.
Example 13
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing amorphous silicon powder:
a. crushing 5kg of amorphous silicon with crystal form and particle size of 2cm, ball-milling for 48 hours by using a ball mill, and sieving by using a 180-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.08kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. placing 5kg of the amorphous silicon powder ground in the step a into a vacuum feeding machine 1, conveying the amorphous silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a feed port 4 of a transition bin, a transition bin 5 and a discharge port 6 of the transition bin, starting a stirring ribbon 13 to continuously stir the amorphous silicon powder in the ribbon blender mixer 7, then adding 2.08kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the amorphous silicon powder in the ribbon blender mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry amorphous silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, and reacting for 2 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the half-dried amorphous silicon powder into a bin 16 through a discharge port 15, transferring the half-dried amorphous silicon powder into a drying oven from the bin 16, and drying at the temperature of 100 ℃ to obtain the silver-silicon antibacterial composite material.
Example 14
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing amorphous silicon powder:
a. crushing 5kg of amorphous silicon with crystal form and particle size of 3cm, ball-milling for 48 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.16kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, placing 5kg of the amorphous silicon powder ground in the step a in a vacuum feeding machine 1, conveying the amorphous silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a feed port 4 of a transition bin, a transition bin 5 and a discharge port 6 of the transition bin, starting a stirring ribbon 13 to continuously stir the amorphous silicon powder in the ribbon blender mixer 7, then adding 2.16kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the amorphous silicon powder in the ribbon blender mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry amorphous silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, and reacting for 5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the half-dried amorphous silicon powder into a bin 16 through a discharge port 15, transferring the half-dried amorphous silicon powder into a drying oven from the bin 16, and drying at the temperature of 50 ℃ to obtain the silver-silicon antibacterial composite material.
Example 15
The device involved in the method is carried out according to the embodiment 1, and the specific operation is carried out according to the following steps:
preparing amorphous silicon powder:
a. crushing 5kg of amorphous silicon with crystal form and particle size of 5cm, ball-milling for 48 hours by using a ball mill, and sieving by using a 200-mesh sieve to obtain silicon powder;
preparing a silver nitrate solution:
b. dissolving 0.32kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. placing 5kg of the amorphous silicon powder ground in the step a into a vacuum feeding machine 1, conveying the amorphous silicon powder into a ribbon blender mixer 7 through a discharge port 2 of the vacuum feeding machine, a powder conveying pipeline 3, a feed port 4 of a transition bin, a transition bin 5 and a discharge port 6 of the transition bin, starting a stirring ribbon 13 to continuously stir the amorphous silicon powder in the ribbon blender mixer 7, then adding 2.32kg of the silver nitrate aqueous solution obtained in the step b into a liquid storage tank 12, spraying the silver nitrate aqueous solution into the amorphous silicon powder in the ribbon blender mixer 7 through a solution conveying elbow pipe 11, a transverse solution conveying pipeline 10, a longitudinal solution conveying pipeline 8 and a solution nozzle 9, stirring for 2 hours to obtain semi-dry amorphous silicon powder loaded with silver ions, then starting a hexahedral ultraviolet light source and a simulated solar light source 14 of the ribbon blender mixer 7, and reacting for 5 hours under the irradiation and high-speed stirring of the ultraviolet light source and the simulated solar light source 14, and transferring the half-dried amorphous silicon powder into a bin 16 through a discharge port 15, transferring the half-dried amorphous silicon powder into a drying oven from the bin 16, and drying at the temperature of 100 ℃ to obtain the silver-silicon antibacterial composite material.
Example 16
500mg of any one of the silver-silicon antibacterial composite materials in examples 1 to 15 was accurately weighed on a high-precision balance, 15 parts of each sample was weighed, and Escherichia coli and Staphylococcus aureus were cultured in LB medium to 1X 108CFU/mL, centrifuging at 5000r/min for 5 min, removing supernatant, and formulating bacteria into 2 × 10 with PBS6CFU/mL of bacterial suspension; 1mL of diluted bacterial solution was added to a centrifuge tube containing 500mg of hydrogel, and 1mL of 2X 10 solution without addition of material was added6CFU/mL bacterial suspension is used as a control, 3 parallel samples are prepared for each group of bacterial suspension, the bacterial suspension is cultured for 10 hours at the temperature of 25 ℃ and the temperature of 37 ℃, after 10 hours, the supernatant is diluted by 1000 times, 20 mu L of the supernatant is taken and plated, after 5 hours, 10 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours and 120 hours, the supernatant is taken out for photographing, the number of bacterial colonies and the removal rate are counted, the total number of the bacterial colonies is tested according to the national standard GB4789.2-2016, and the antibacterial performance is shown in Table 1;
TABLE 1 theoretical loading, actual loading, average particle size and antibacterial properties of nano-silver in examples
Example 17 (comparative)
Comparative example 1, the theoretical silver loadings are consistent as shown in table 2:
preparing single crystal silicon powder:
weighing 5kg of monocrystalline silicon with the particle size of 0.5cm, grinding the monocrystalline silicon by using a superfine grinder and a ball mill until the particle size is 150 meshes;
preparing a silver nitrate solution:
weighing 0.02kg of silver nitrate according to the weight, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.005kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of monocrystalline silicon powder, dissolving the monocrystalline silicon powder in 2.02kg of silver nitrate aqueous solution, placing the solution for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by using pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-silicon antibacterial composite material.
Example 18 (comparative)
Comparative example 2, the theoretical silver loadings are consistent as shown in table 2:
preparing single crystal silicon powder:
weighing 5kg of monocrystalline silicon with the particle size of 1cm, grinding the monocrystalline silicon by using a superfine grinder and a ball mill until the particle size is 200 meshes;
preparing a silver nitrate solution:
weighing 0.04kg of silver nitrate according to the weight, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.01kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of single crystal silicon powder, dissolving the single crystal silicon powder in 2.04kg of silver nitrate aqueous solution, placing the solution for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by using pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-silicon antibacterial composite material.
Example 19 (comparative)
Comparative example 3, the theoretical silver loadings are consistent as shown in table 2:
preparing single crystal silicon powder:
weighing 5kg of monocrystalline silicon with the particle size of 2cm, grinding the monocrystalline silicon by using a superfine grinder and a ball mill until the particle size is 180 meshes;
preparing a silver nitrate solution:
weighing 0.08kg of silver nitrate according to the weight, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.02kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of silicon powder, dissolving the silicon powder in 2.08kg of silver nitrate aqueous solution, placing the solution for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by using pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-silicon antibacterial composite material.
Example 20 (comparative)
Comparative example 4, the theoretical silver loadings are consistent as shown in table 2:
preparing single crystal silicon powder:
weighing 5kg of monocrystalline silicon with the particle size of 4cm, grinding the monocrystalline silicon by using a superfine grinder and a ball mill until the particle size is 150 meshes;
preparing a silver nitrate solution:
weighing 0.16kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.04kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of single crystal silicon powder, dissolving the single crystal silicon powder in 2.16kg of silver nitrate aqueous solution, placing the solution for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by using pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-silicon antibacterial composite material.
Example 21 (comparative)
Comparative example 5, the theoretical silver loadings are consistent as shown in table 2:
preparing single crystal silicon powder:
weighing 5kg of monocrystalline silicon with the particle size of 2cm, grinding the monocrystalline silicon by using a superfine grinder and a ball mill until the particle size is 200 meshes;
preparing a silver nitrate solution:
weighing 0.32kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.08kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of single crystal silicon powder, dissolving the single crystal silicon powder in 2.32kg of silver nitrate aqueous solution, placing the solution for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by using pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-silicon antibacterial composite material.
Example 22 (comparative)
Comparative example 1 the theoretical silver loadings are consistent as shown in table 2:
preparing a silver nitrate solution:
weighing 0.02kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.005kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of activated carbon powder with an iodine value of 1000, dissolving the activated carbon powder in 2.02kg of silver nitrate aqueous solution, placing the activated carbon powder in a dark place for 24 hours, adding the prepared sodium borohydride aqueous solution into the silver nitrate aqueous solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-activated carbon composite material.
Example 23 (comparative)
Comparative example 2, the theoretical silver loadings are consistent as shown in table 2:
preparing a silver nitrate solution:
weighing 0.04kg of silver nitrate, dissolving in 2kg of water, and obtaining silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.01kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of activated carbon powder with an iodine value of 1000, dissolving the activated carbon powder in 2.04kg of silver nitrate aqueous solution, placing the activated carbon powder in a dark place for 24 hours, adding the prepared sodium borohydride aqueous solution into the silver nitrate aqueous solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-activated carbon composite material.
Example 24 (comparative)
Comparative example 3, the theoretical silver loadings are consistent as shown in table 2:
preparing a silver nitrate solution:
weighing 0.08kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.02kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of activated carbon powder with an iodine value of 1000, dissolving the activated carbon powder in 2.08kg of silver nitrate aqueous solution, standing for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by pure water, and drying the product at 80 ℃ to obtain the silver-activated carbon composite material.
Example 25 (comparative)
Comparative example 4, the theoretical silver loadings are consistent as shown in table 2:
preparing a silver nitrate solution:
weighing 0.16kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.04kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of activated carbon powder with an iodine value of 1000, dissolving the activated carbon powder in 2.16kg of silver nitrate aqueous solution, placing the activated carbon powder in a dark place for 24 hours, adding the prepared sodium borohydride aqueous solution into the silver nitrate aqueous solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by pure water, and drying the product at the temperature of 80 ℃ to obtain the silver-activated carbon composite material.
Example 26 (comparative)
Comparative example 5, the theoretical silver loadings are consistent as shown in table 2:
preparing a silver nitrate solution:
weighing 0.32kg of silver nitrate, dissolving in 2kg of water to obtain a silver nitrate water solution;
preparing a reducing agent solution:
weighing 0.08kg of sodium borohydride, dissolving in 1kg of water to obtain a sodium borohydride aqueous solution;
synthesizing a silver-silicon composite material:
weighing 5kg of activated carbon powder with an iodine value of 1000, dissolving the activated carbon powder in 2.32kg of silver nitrate aqueous solution, standing for 24 hours in a dark place, adding the prepared sodium borohydride aqueous solution into the solution, continuously stirring the solution in the adding process, continuously stirring the solution for 1 hour after the reaction is finished, washing the centrifugally separated solid product for 5 times by pure water, and drying the product at 80 ℃ to obtain the silver-activated carbon composite material.
TABLE 2 theoretical loading, actual loading, average particle size and antibacterial properties of nano-silver in comparative examples
From the comparison it can be seen that: the silver-silicon antibacterial composite material and the silver-activated carbon composite material prepared by adopting the wet reduction method have the advantages of low nano silver loading capacity, large particle size and poor antibacterial and antibacterial properties, and the silver-silicon antibacterial composite material prepared by adopting the method has better antibacterial property.
Claims (3)
1. A preparation method of a silver-silicon antibacterial composite material is characterized in that a device related to the method consists of a vacuum feeding machine (1), a discharge hole (2) of the vacuum feeding machine, a powder conveying pipeline (3), a transition bin feed inlet (4), a transition bin (5), a transition bin discharge hole (6), a spiral belt mixer (7), a longitudinal solution conveying pipeline (8), a solution nozzle (9), a transverse solution conveying pipeline (10), a solution conveying elbow (11), a liquid storage tank (12), a spiral belt (13), an ultraviolet light source, a simulated solar light source (14), a mixer discharge hole (15), a storage bin (16), a mixer support (17) and a moving wheel (18), wherein the bottom of the vacuum feeding machine (1) is provided with the discharge hole (2) of the vacuum feeding machine, and the discharge hole (2) of the vacuum feeding machine is connected with one end of the powder conveying pipeline (3), the other end of the powder conveying pipeline (3) is connected with a transition bin feed inlet (4), the transition bin feed inlet (4) is positioned at the top of a transition bin (5), a transition bin discharge outlet (6) at the bottom of the transition bin (5) is connected with a ribbon blender mixer (7), a plurality of longitudinal solution conveying pipelines (8) which are equally arranged are arranged at the top of the ribbon blender mixer (7), solution nozzles (9) are respectively arranged on the longitudinal solution conveying pipelines (8), the longitudinal solution conveying pipelines (8) are connected with a transverse solution conveying pipeline (10), the transverse solution conveying pipeline (10) is connected with a liquid storage tank (12) through a solution conveying elbow (11), a ribbon (13) is arranged in the ribbon blender mixer (7), an ultraviolet light source and a simulated solar light source (14) are respectively arranged on a hexahedron the ribbon blender mixer (7), a discharge outlet (15) is arranged at the bottom of the ribbon blender mixer (7), the discharge port (15) is connected with the stock bin (16), the bottom of the ribbon blender (7) is respectively provided with a bracket (17) with a movable wheel (18), the ribbon blender (7) is made of quartz or glass, and the concrete operation is carried out according to the following steps:
preparing single crystal silicon powder:
a. crushing the elemental silicon with the crystal form with the particle size of 0.5-5cm, ball-milling for 24-48 hours by using a ball mill, and sieving by using a sieve of 150 meshes and 200 meshes to obtain silicon powder, wherein the elemental silicon is monocrystalline silicon, polycrystalline silicon or amorphous silicon;
preparing a silver nitrate solution:
b. dissolving 0.02-0.32kg of silver nitrate in 2kg of water according to the weight to obtain a silver nitrate water solution;
synthesizing a silver-silicon composite material:
c. b, conveying the silicon powder ground in the step a into a ribbon blender mixer (7) through a vacuum feeding machine (1), a discharge hole (2) of the vacuum feeding machine, a powder conveying pipeline (3), a feed hole (4) of a transition bin, a transition bin (5) and a discharge hole (6) of the transition bin, then starting a stirring ribbon (13) to enable the silicon powder to be continuously stirred in the ribbon blender mixer (7), then adding the prepared silver nitrate aqueous solution obtained in the step b into a liquid storage tank (12), spraying the silver nitrate aqueous solution into the silicon powder in the ribbon blender mixer (7) through a solution conveying bent pipe (11), a transverse solution conveying pipeline (10), a longitudinal solution conveying pipeline (8) and a solution nozzle (9), stirring for 2 hours to obtain semi-dry silicon powder loaded with silver ions, then starting an ultraviolet light source and a simulated solar light source (14) on a hexahedron the ribbon blender mixer (7), and irradiating and stirring at a high speed under the ultraviolet light source and the simulated solar light source (14), reacting for 1-5 hours, transferring the half-dried silicon powder into a storage bin (16) through a discharge hole (15) after the reaction is finished, transferring the silicon powder into a drying box from a storage bin (6), and drying at the temperature of 50-100 ℃ to obtain the silver-silicon antibacterial composite material.
2. The method for preparing a silver-silicon antibacterial composite material as claimed in claim 1, wherein in the step c, the silicon powder is mixed with the silver nitrate aqueous solution in a spraying manner according to a mass ratio of 0.001-0.1: 0.5-1.
3. Use of the silver-silicon antibacterial composite material obtained by the method of claim 1 in preparation of a simultaneous removal of escherichia coli and staphylococcus aureus.
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Application publication date: 20210205 |