阅读说明：本技术 基于金属有机框架的银纳米颗粒复合抗菌材料的制备方法 (Preparation method of silver nanoparticle composite antibacterial material based on metal organic framework ) 是由 彭丽 薛天威 李耀鑫 李哲英 李军 王焱良 于 2021-08-31 设计创作，主要内容包括：基于金属有机框架的银纳米颗粒复合抗菌材料的制备方法,包括以下步骤：1)制备MIL-127/PoPD：活化MIL-127,将其分散于邻苯二胺溶液中,然后将混合物放入高压釜中,密封加热,将超临界CO-(2)引入高压釜中；2)制备MIL-127/PoPD@Ag：将MIL-127/PoPD与Ag～(+)溶液混合反应,离心,洗涤干燥；3)制备MIL-127/PoPD@Ag-D：将MIL-127/PoPD@Ag加入碱溶液中反应,之后中和。用超临界CO-(2)介入的技术制备金属有机骨架(MIL-127)和聚合物(PoPD)的复合材料,实现银离子的氧化还原吸附从而在材料的孔道内生成银纳米颗粒,该复合材料具有抗菌能力。(The preparation method of the silver nanoparticle composite antibacterial material based on the metal organic framework comprises the following steps: 1) preparation of MIL-127/PoPD: activating MIL-127, dispersing in o-phenylenediamine solution, placing the mixture in autoclave, sealing, heating, and adding supercritical CO 2 Introducing into a high-pressure kettle; 2) preparation of MIL-127/PoPD @ Ag: mixing MIL-127/PoPD with Ag + Mixing the solution for reaction, centrifuging, washing and drying; 3) preparation of MIL-127/PoPD @ Ag-D: MIL-127/PoPD @ Ag is added into an alkali solution for reaction, and then neutralized. By supercritical CO 2 The composite material of metal organic framework (MIL-127) and polymer (PoPD) is prepared by an interventional technology, the redox adsorption of silver ions is realized, so that silver nanoparticles are generated in the pore channels of the material, and the composite material has antibacterial capability.)

1. The preparation method of the silver nanoparticle composite antibacterial material based on the metal organic framework is characterized by comprising the following steps:

1) preparation of MIL-127/PoPD: activating MIL-127 under vacuum condition at certain temperature, cooling to room temperature after activation, dispersing in anhydrous ethanol solution of o-phenylenediamine, placing the mixture in a high-pressure autoclave, sealing and heating, and setting CO by supercritical₂Introducing into a high-pressure kettle; stirring and reacting under certain pressure, releasing the pressure, and washing and drying the obtained powder;

2) preparation of MIL-127/PoPD @ Ag: mixing MIL-127/PoPD with Ag⁺Mixing the solution, reacting, centrifuging, washing and drying.

2. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, further comprising the steps of:

3) preparation of MIL-127/PoPD @ Ag-D: MIL-127/PoPD @ Ag was added to the alkali solution, the reaction was stirred, and then neutralized with an acid.

3. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in the step 1), the mass ratio of the MIL-127 to the o-phenylenediamine is 0.02: 1-10: 1.

4. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in the step 1), the concentration of the o-phenylenediamine is 0.1-1.0M.

5. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in the step 1), the certain temperature is 80-200 ℃, and the sealing and heating temperature is 50-120 ℃.

6. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in the step 1), the certain pressure is 6-18 MPa, and the stirring reaction time is 1-30 h.

7. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in the step 2), the loading amount of the silver is 0.1-20%.

8. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 1, wherein: in step 2), the Ag⁺The concentration of the solution is 10-1000 ppm.

9. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 2, wherein: in the step 3), the mass ratio of MIL-127/PoPD @ Ag to the alkali is 0.05: 1-1: 0.2.

10. The method for preparing silver nanoparticle composite antibiotic material based on metal organic framework as claimed in claim 2, wherein: in the step 3), the alkali is inorganic alkali or organic alkali, and the concentration of the alkali solution is 0.01-1M; the acid is inorganic acid or organic acid, and the pH value of the solution after neutralization of the acid is 5-8.

Technical Field

The invention relates to the technical field of antibacterial materials, in particular to a preparation method of a silver nanoparticle composite antibacterial material based on a metal organic framework.

Background

Silver is a functional material used in various industries, and is widely used in many antibacterial products because of its broad-spectrum antibacterial activity. Compared with other antibacterial materials, the silver nanoparticles have remarkable bactericidal effect and lower biotoxicity. However, in practical application, silver nanoparticles can continuously release silver ions, and cause serious toxic effects while sterilizing. The compounding of silver nanoparticles with other materials is a promising approach to endow these materials with antimicrobial properties, while reducing the deleterious effects of silver nanoparticles.

Currently, silver nanoparticle composite materials have received attention, and at present, the materials have the problems of insufficient antibacterial performance, incapability of releasing according to requirements, high price and the like. Therefore, how to find a method for preparing a high-efficiency antibacterial material capable of being released according to needs is a problem which people want to solve.

Disclosure of Invention

The present invention is directed to solving the above problems of the prior art and to providing a method for preparing a silver nanoparticle composite antibacterial material based on a metal organic framework.

The preparation method of the silver nanoparticle composite antibacterial material based on the metal organic framework comprises the following steps:

1) preparation of MIL-127/PoPD: activating MIL-127 under vacuum condition at certain temperature, cooling to room temperature after activation, dispersing in anhydrous ethanol solution of o-phenylenediamine, placing the mixture in a high-pressure autoclave, sealing and heating, and setting CO by supercritical₂Introducing into a high-pressure kettle; the reaction is stirred under pressure, after which the pressure is adjustedReleasing, washing and drying the obtained powder;

2) preparation of MIL-127/PoPD @ Ag: mixing MIL-127/PoPD with Ag⁺Mixing the solution, reacting, centrifuging, washing and drying.

The invention also comprises the following steps:

3) preparation of MIL-127/PoPD @ Ag-D: MIL-127/PoPD @ Ag was added to the alkali solution, the reaction was stirred, and then neutralized with an acid.

In the step 1), the mass ratio of the MIL-127 to the o-phenylenediamine is 0.02: 1-10: 1.

In the step 1), the concentration of the o-phenylenediamine is 0.1-1.0M.

In the step 1), the certain temperature is 80-200 ℃, and the sealing and heating temperature is 50-120 ℃.

In the step 1), the certain pressure is 6-18 MPa, and the stirring reaction time is 1-30 h.

In the step 2), the loading amount of the silver is 0.1-20%.

In step 2), the Ag⁺The concentration of the solution is 10-1000 ppm.

In the step 3), the mass ratio of MIL-127/PoPD @ Ag to the alkali is 0.05: 1-1: 0.2.

In the step 3), the alkali is inorganic alkali or organic alkali, and the concentration of the alkali solution is 0.01-1M.

In the step 3), the acid is inorganic acid or organic acid, and the pH value of the solution after neutralization of the acid is 5-8.

In order to achieve the purpose, the invention adopts the following technical scheme:

compared with the prior art, the technical scheme of the invention has the following beneficial effects:

the invention adopts supercritical CO₂The intervening technology prepares a composite material of a specific metal organic framework (MIL-127) and a polymer (PoPD), and the material can realize the oxidation-reduction adsorption of silver ions so as to generate silver nanoparticles in the pores of the material. The composite material has antibacterial capacity, and can destroy the metal organic framework structure when needed, release more silver and generate stronger antibacterial effect.

The antibacterial material prepared by the invention has excellent antibacterial performance on gram-positive bacteria (taking staphylococcus aureus S. aureus as an example) and gram-negative bacteria (taking escherichia coli E. coli K12 MG1655 as an example), is difficult to enable the bacteria to generate drug resistance, has high biocompatibility, and can realize stronger antibacterial effect by simply destroying a composite structure when needed.

Drawings

FIG. 1 is an XRD spectrum of MIL-127/PoPD @ Ag of example 1.

FIG. 2 is an XPS spectrum of MIL-127/PoPD @ Ag of example 1.

FIG. 3 is STEM picture and EDX analysis of MIL-127/PoPD @ Ag of example 1.

FIG. 4 is a graph showing the minimum inhibitory concentration of MIL-127/PoPD @ Ag measured using a 96-well plate in example 1.

FIG. 5 is a graph of the minimum inhibitory concentration of example 1 using a 96-well plate MIL-127/PoPD @ Ag-D.

FIG. 6 is the experimental plot of the inhibition zone of MIL-127/PoPD @ Ag-D of example 7.

FIG. 7 shows the results of experiments on the bactericidal activity of example 9MIL-127/PoPD @ Ag-D on E.coli.

FIG. 8 shows the results of the experiment on the bactericidal rate of example 9MIL-127/PoPD @ Ag-D against Staphylococcus aureus.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

Example 1

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 26 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 19 wt%. The specific preparation method is as follows.

1. The synthesis method of MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid comprises the following steps: 9.5g of 5-nitroisophthalic acid were dissolved in 125mL of deionized water and the solution was heated to 55 ℃. 25g of sodium hydroxide were added with stirring to give a yellow suspension. 50g D- (+) -glucose was dissolved in 75mL deionized water and added to the suspension. When the suspension turned brown, the heating was stopped and air was blown into the suspension using an air generator for overnight reaction. After waiting for the suspension to cool down, the suspension was placed in an ice bath and filtered. The filtrate was then dispersed in 125ml of deionized water and acidified with concentrated hydrochloric acid. The resulting orange precipitate was washed with water and ethanol and dried under vacuum overnight.

2. Preparation of MIL-127: 1.72g of FeCl₃·6H₂O and 1.11g of 3,3', 5,5' -azobenzene tetracarboxylic acid were dispersed in a round-bottomed flask with 25mL of DMF. The mixture was refluxed at 155 ℃ for 16h with stirring and filtered. The resulting brown solid was washed with 100mL DMF at 50 ℃ with stirring for 2 h. The solid was then washed with 100mL ethanol and 100mL deionized water, respectively, with stirring at 60 ℃ for 2 h. The final orange product was centrifuged and washed with ethanol and dried under vacuum overnight.

3. Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump, and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.3M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 12MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 24 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

4. Preparation of MIL-127/PoPD @ Ag: 50mg MIL-127/PoPD was treated with 100mL 100ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 19% according to ICP-OES. The XRD spectrum and XPS Ag 3d spectrum of the material are shown in figure 1 and figure 2. The material contains simple substance silver, namely silver ions in the solution are reduced and anchored on M through oxidation-reduction adsorptionOn IL-127/PoPD, nanoparticles are formed. Referring to fig. 3, it can be seen from STEM map and EDX analysis of MIL-127/PoPD @ Ag that the silver nanoparticles are uniformly distributed on the material.

5. Preparation of MIL-127/PoPD @ A-Dg: 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.5), the product can be directly used as an antibacterial agent.

As shown in FIGS. 4 to 5, the Minimum Inhibitory Concentration (MIC) of the antibacterial material for inhibiting the growth of bacteria was measured using a 96-well plate, and the minimum inhibitory concentration of the material was visually observed in the graph, in which the concentration and higher at which the bacteria could not grow was indicated in the box. Specifically, 100. mu.L of Staphylococcus aureus bacterial solution was added to the A1-A11 wells. Sterile LB liquid medium was added to a12 wells as a control. The B-F wells were operated the same, but the D-F wells were replaced by addition of E.coli K12-MG1655 and sterile LB liquid medium to the H wells as controls. mu.L of MIL-127/PoPD @ Ag or MIL-127/PoPD @ Ag-D dispersion was added to A1 wells. The solution was mixed well to ensure a concentration of 512. mu.g/mL. 100 μ L of the solution in the a1 well was added to the a2, then 100 μ L of the solution in the a2 well was added to the A3 well. Then diluted to A10 in turn in the same way. Discard 100 μ L of solution in a10 well. The sample concentrations for the A1-A10 wells were 512, 256, 128, 64, 32, 16, 8, 4, 2, and 1. mu.g/mL, respectively. Control A11 wells, no sample was added. The same applies to the other rows. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. MIC of MIL-127/PoPD @ Ag to Staphylococcus aureus was 512 μ g/mL; the MIC for E.coli was 512. mu.g/mL. The MIC of MIL-127/PoPD @ Ag-D to Staphylococcus aureus was 64 μ g/mL; the MIC for E.coli was 32. mu.g/mL.

Example 2

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 8 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, wherein the content of silver is 3 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.1M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 50 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 12MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 1 hour with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated to 100mL 10ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 3% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.01M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.4), the product can be directly used as an antibacterial agent.

The Minimum Inhibitory Concentration (MIC) of the material was determined using the same 96-well plate method as in example 1. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. MIC of MIL-127/PoPD @ Ag to Staphylococcus aureus is 1024 μ g/mL; the MIC for E.coli was 1024. mu.g/mL. MIC of MIL-127/PoPD @ Ag-D to Staphylococcus aureus was 192 μ g/mL; the MIC for E.coli was 96. mu.g/mL.

Example 3

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 15 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 10 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.5M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 120 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 6MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 12 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated with 100mL 100ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 10% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.5M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH-8), can be directly used as antibacterial agent.

The Minimum Inhibitory Concentration (MIC) of the material was determined using the same 96-well plate method as in example 1. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. MIC of MIL-127/PoPD @ Ag to Staphylococcus aureus was 512 μ g/mL; the MIC for E.coli was 768. mu.g/mL. MIC of MIL-127/PoPD @ Ag-D to Staphylococcus aureus is 96 μ g/mL; the MIC for E.coli was 96. mu.g/mL.

Example 4

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 25 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 20 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPDPreparing: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.2M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 12MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 30 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated with 100mL 1000ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 20% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.2M aqueous ammonia solution. After stirring for 12h and neutralizing with acetic acid solution (pH 7), it can be used as antibacterial agent directly.

The Minimum Inhibitory Concentration (MIC) of the material was determined using the same 96-well plate method as in example 1. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. MIC of MIL-127/PoPD @ Ag to Staphylococcus aureus was 512 μ g/mL; the MIC for E.coli was 256. mu.g/mL. The MIC of MIL-127/PoPD @ Ag-D to Staphylococcus aureus was 64 μ g/mL; the MIC for E.coli was 16. mu.g/mL.

Example 5

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 5 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 0.1 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: activation of 1g MIL-127 using a schlenk line and oil pump under vacuum at 80 deg.CThe reaction was allowed to proceed overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.1M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 6MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 1 hour with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated to 100mL 10ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 0.1% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 5), the product can be directly used as an antibacterial agent.

The Minimum Inhibitory Concentration (MIC) of the material was determined using the same 96-well plate method as in example 1. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. Due to the fact that the content of silver is low, the antibacterial capacity of the material is poor, and the MIC of MIL-127/PoPD @ Ag to staphylococcus aureus is 5.12 mg/mL; the MIC for E.coli was 5.12 mg/mL. The effect was unchanged after preparation of MIL-127/PoPD @ Ag-D.

Example 6

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 26 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 15 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it is cooled to room temperature and dispersed in30ml of 0.3M o-phenylenediamine in absolute ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 12MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 24 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 20mg MIL-127/PoPD was treated with 100mL 200ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. MIL-127/PoPD @ Ag antibacterial material was obtained, and the silver loading was about 15% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.5), the product can be directly used as an antibacterial agent.

The Minimum Inhibitory Concentration (MIC) of the material was determined using the same 96-well plate method as in example 1. The 96-well plates were incubated at 37 ℃ and 250rpm for 16 h. And (3) measuring the concentration of the bacteria by using a microplate reader, and determining that the minimum concentration at which the bacteria can not grow any more is MIC. MIC of MIL-127/PoPD @ Ag to Staphylococcus aureus was 512 μ g/mL; the MIC for E.coli was 512. mu.g/mL. The MIC of MIL-127/PoPD @ Ag-D to Staphylococcus aureus was 128. mu.g/mL; the MIC for E.coli was 64. mu.g/mL.

Example 7

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 26 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 15 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum using a schlenk line and an oil pump at 200 ℃ and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 1.0M solution of o-phenylenediamine in anhydrous ethanol. Then the mixture is put into the container 100mL in autoclave. The autoclave was hermetically sealed and heated to 50 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 18MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 24 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated with 100mL 800ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. MIL-127/PoPD @ Ag antibacterial material was obtained, and the silver loading was about 15% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.5), the product can be directly used as an antibacterial agent.

100 μ L of the sample (1.1mg/mL) was dispersed on a dry circular piece of paper. The bacterial solution was spread evenly on the surface of the medium. After the bacteria liquid is completely absorbed by the culture medium, the A-E small paper sheets are placed on the culture medium. The medium was stored at 4 ℃ for 2 hours in a refrigerator and then transferred to a 37 ℃ incubator for 24 hours, and formation of the inhibition zone was observed. From fig. 6, it is apparent that the formation of the zone of inhibition is observed, indicating that the antibacterial effect of the material is very good.

Example 8

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 20 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 10 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 180 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.2M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After the temperature is stabilized, the reaction is carried out by supercriticalPlacing CO₂Slowly introduced into the autoclave. When the pressure stabilized at 6MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 12 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 100mg MIL-127/PoPD was treated with 100mL 100ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 10% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.4), the product can be directly used as an antibacterial agent.

100 μ L of the sample (1.5mg/mL) was dispersed on a dry circular piece of paper. The bacterial solution was spread evenly on the surface of the medium. After the bacteria liquid is completely absorbed by the culture medium, the A-E small paper sheets are placed on the culture medium. The medium was stored in a refrigerator at 4 ℃ for 2 hours and then transferred to an incubator at 37 ℃ for 24 hours, and the formation of a zone of inhibition was observed.

Example 9

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 26 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 20 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: 0.2g of MIL-127 was activated under vacuum at 150 ℃ using a schlenk line and an oil pump and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.5M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 60 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 12MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 24 hours with stirring. Then slowly releasing the pressure. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated with 100mL 500ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 20% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.2M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7.6), can be directly used as antibacterial agent.

100 mul of high-concentration staphylococcus aureus liquid is added into a 600 mul centrifuge tube, and then a sample and an LB culture medium are added. A solution containing 64. mu.g/mL of PoPD, MIL-127/PoPD @ Ag-D and 128. mu.g/mL of MIL-127/PoPD @ Ag-D was added, the mixture was transferred to an incubator at 37 ℃ for 24 hours, and the bacterial concentration was measured with a microplate reader. Escherichia coli was treated in the same manner at concentrations of 128. mu.g/mL and 160. mu.g/mL, respectively. The sterilization rate (sterilization rate) was calculated using the following formula:

in the formula: c₀At an initial concentration of bacteria, C_eThe final bacterial concentration.

7-8 are obtained through calculation, and it can be seen that the sterilization performance of the silver composite material is greatly improved, and the sterilization rate is kept to be more than 99% after 12 hours and 24 hours.

Example 10

In the embodiment, a metal organic framework (MIL-127) material is used as a template, a polymer (poly-o-phenylenediamine, PoPD) is firstly introduced for compounding, the content of the polymer is 15 wt%, then, silver ions are recovered and reduced in silver-containing wastewater, and finally, the synthesis of the metal organic framework/silver nanoparticle composite antibacterial material is realized, and the content of silver is 9 wt%.

MIL-127 ligand 3,3', 5,5' -azobenzene tetracarboxylic acid and MIL-127 were prepared in the same manner as in example 1.

Preparation of MIL-127/PoPD: using schlenk line and oil pump under vacuum condition of 100 deg.C0.2g of MIL-127 was activated and reacted overnight. After activation, it was cooled to room temperature and dispersed in 30ml of a 0.1M solution of o-phenylenediamine in anhydrous ethanol. The mixture was then placed in a 100mL autoclave. The autoclave was hermetically sealed and heated to 120 ℃. After temperature stabilization, CO is added by supercritical setting₂Slowly introduced into the autoclave. When the pressure stabilized at 6MPa with 500rpm agitation, the inlet valve was closed. The reaction was continued for 12 hours with stirring. After which the pressure is slowly released. The resulting dark brown powder was washed with ethanol and dried under vacuum overnight.

Preparing an antibacterial material: 50mg MIL-127/PoPD was treated to 100mL 50ppm Ag⁺And (3) solution. After 2h, the samples were centrifuged, washed with ethanol and dried under vacuum overnight. The MIL-127/PoPD @ Ag antibacterial material is obtained, and the silver loading is about 9% according to ICP-OES. 10mg of MIL-127/PoPD @ Ag was added to 5mL of a 0.1M NaOH solution. After stirring for 12h and neutralizing with nitric acid solution (pH 7), the product can be directly used as an antibacterial agent.

100 mul of high-concentration staphylococcus aureus liquid is added into a 600 mul centrifuge tube, and then a sample and an LB culture medium are added. A solution containing 64. mu.g/mL of PoPD, MIL-127/PoPD @ Ag-D and 128. mu.g/mL of MIL-127/PoPD @ Ag-D was added, the mixture was transferred to an incubator at 37 ℃ for 24 hours, and the bacterial concentration was measured with a microplate reader. Escherichia coli was treated in the same manner at concentrations of 128. mu.g/mL and 160. mu.g/mL, respectively. The sterilization rate (sterilization rate) was calculated using the following formula:

in the formula: c₀At an initial concentration of bacteria, C_eThe final bacterial concentration.

The bactericidal performance of the silver composite material is obtained through calculation, the bactericidal rate is kept to be more than 90% after 12 hours, and the bactericidal rate is kept to be more than 80% after 24 hours.