CN111592661A - Preparation method of high-dispersity organic metal framework nano material - Google Patents
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Abstract
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps: step 1, stirring and dissolving a certain amount of 2-methylimidazole in water; step 2, adding a certain amount of hexadecyl trimethyl ammonium bromide aqueous solution into the step 1 and keeping stirring for a certain time; step 3, adding a certain amount of zinc nitrate nonahydrate aqueous solution into the step and maintaining stirring for a certain time; step 4, stopping stirring, and naturally standing the obtained sample at room temperature for a period of time; and 5, adding a certain amount of polymer surfactant into the mixture obtained in the step 4, stirring and maintaining for a certain time, and dialyzing and purifying to obtain the surface-modified organic metal framework material dispersed in water. The method disclosed by the invention is simple to operate, can obviously improve the stability of the organic metal framework material in water, has the particle size of less than 100 nm, and provides possibility for subsequent biomedical application.
Description
Technical Field
The invention belongs to the technical field of surface modification, and particularly relates to a surface modification method of an organic metal framework.
Background
The advent of Metal Organic Frameworks (MOFs) in colloidal form brought a paradigm shift in the design of novel functional porous materials, and colloidal MOF particles can impart further properties and applications to them by regulating dispersion, shaping, functionalization, transformation, and assembly, in addition to their intrinsic form as porous supports. In this regard, zeolitic imidazolate framework-8 (ZIF-8), a member of MOF, has become the precursor of colloidal science, and now, after more than a decade of research, it has become possible to produce monodispersed colloidal ZIF-8 particles with adjustable size and morphology, thus providing opportunities for developing new functional composites.
However, the structure of ZIF-8 is unstable in water, and water molecules hydrolyze the imidazole group coordinated to the metal center to destroy the skeleton. Through surface modification, the structural stability of ZIF-8 in water can be improved. The unmodified ZIF-8 can not be stably dispersed in water and can have an agglomeration phenomenon, and the polymer surfactant serving as a common solubilizer can be contacted with the surface of a hydrophobic material, so that the stability of the hydrophobic material in water is obviously improved.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for preparing a highly dispersible organometallic framework nanomaterial, which can improve the stability of a metal-organic framework in water without multi-step modification.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, stirring and dissolving a certain amount of 2-methylimidazole in water;
step 2, adding a certain amount of hexadecyl trimethyl ammonium bromide aqueous solution into the step 1 and keeping stirring for a certain time;
step 3, adding a certain amount of zinc nitrate nonahydrate aqueous solution into the step and maintaining stirring for a certain time;
step 4, stopping stirring, and naturally standing the obtained sample at room temperature for a period of time;
and 5, adding a certain amount of polymer surfactant into the mixture obtained in the step 4, stirring and maintaining for a certain time, and dialyzing and purifying to obtain the surface-modified organic metal framework material dispersed in water.
The invention is further improved in that: in the step 1, the concentration of 2-methylimidazole is 1.32 mol/L, and the amount of 2-methylimidazole is 1 mL.
The invention is further improved in that: in the step 2, the concentration of the aqueous solution of cetyltrimethylammonium bromide was 1 mg/mL, and the amount of the aqueous solution of cetyltrimethylammonium bromide was 400 μ L.
The invention is further improved in that: in the step 3, the concentration of the zinc nitrate nonahydrate aqueous solution is 24mmol/L, and the amount of the zinc nitrate nonahydrate aqueous solution is 1 mL.
The invention is further improved in that: the stirring time in the steps 1, 2 and 3 is 10 min.
The invention is further improved in that: in the step 4, the natural standing time is 0-24 h.
The invention is further improved in that: in said step 5, the polymeric surfactant is Pluronic@F-127 (F-127 for short) and Pluronic@F-108 (short for F-108) and Pluronic@F-68 (F-68 for short), polyvinylpyrrolidone (PVP for short) or polyoxyethylene (100) octadecyl ether (Brij for short)@S 100）。
The invention is further improved in that: in the step 5, the amount of the polymeric surfactant is 10 mg.
The invention is further improved in that: in the step 5, the stirring time is 6 h.
The invention has the beneficial effects that: the invention can obviously improve the stability of the metal organic framework in water through simple surface modification without multi-step modification, so that the metal organic framework material is suitable for the field of biomedicine, has the particle size of less than 100 nm, and is convenient for researchers to master and use.
Drawings
FIG. 1 is a pictorial comparison of ZIF-8 and ZIF-8/F-127.
FIG. 2 is a graph comparing the light scattering of ZIF-8 and ZIF-8/F-127.
FIG. 3 is a transmission electron microscope photograph of ZIF-8/F-127.
FIG. 4 is a transmission electron microscope photograph of ZIF-8.
FIG. 5 is a transmission electron microscope photograph of ZIF-8/PVP.
FIG. 6 is a transmission electron microscope photograph of the material obtained in example four.
FIG. 7 is a TEM image of the material obtained in example V.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, stirring and dissolving a certain amount of 2-methylimidazole in water;
step 2, adding a certain amount of hexadecyl trimethyl ammonium bromide aqueous solution into the step 1 and keeping stirring for a certain time;
step 3, adding a certain amount of zinc nitrate nonahydrate aqueous solution into the step and maintaining stirring for a certain time;
step 4, stopping stirring, and naturally standing the obtained sample at room temperature for a period of time;
and 5, adding a certain amount of polymer surfactant into the mixture obtained in the step 4, stirring and maintaining for a certain time, and dialyzing and purifying to obtain the surface-modified organic metal framework material dispersed in water.
Example one
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
and 5, adding 10mg of F-127 into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the organic metal framework material which is dispersed in water and is subjected to surface modification of F127.
The experimental result shows that as shown in figure 1, figure 2 and figure 3, the ZIF-8 modified by F-127 is uniformly dispersed in water, the solution is clear and transparent, the particle size is about 50 nm, the solution is cubic, and the Tyndall phenomenon exists under the irradiation of a laser pen.
Example two
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
and 5, dialyzing and purifying to obtain the organic metal framework material dispersed in water.
The experimental result shows that as shown in fig. 1, fig. 2 and fig. 4, the transmission electron microscope image of ZIF-8 is in a cube shape of about 50 nm, the solution is in a white turbid shape, and the light scattering can be observed to be obviously strengthened under the irradiation of laser, which indicates that the particles are seriously agglomerated.
EXAMPLE III
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
step 5, washing the solution after standing for 3 times by using methanol, and dispersing in the methanol;
and 6, adding 10mg of F-127 into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the organic metal framework material which is dispersed in water and is surface-modified with F-127.
Experimental results show that the washed ZIF-8 is still agglomerated after being treated by F127, and the dispersibility cannot be obviously changed through subsequent F127 modification.
Example four
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
and 4, immediately adding 10mg of F-127 into the solution, stirring for 6 hours, and dialyzing to obtain the organic metal framework material which is dispersed in water and is surface-modified with F-127.
As shown in FIG. 6, it was found that the addition of the surface modifier F-127 to the ZIF-8 which had not been allowed to stand immediately inhibited the growth of ZIF-8, which resulted in the failure to shape the ZIF-8.
EXAMPLE five
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
and 4, adding 10mg of F-127 into the solution, stirring for 6 hours, and dialyzing to obtain the organic metal framework material which is dispersed in water and is surface-modified with F-127.
The experimental result shows that as shown in FIG. 7, when the surface modifier F-127 is added to the ZIF-8 stirred for 10 min, the square nano-material appears but a large amount of particles are not formed, which indicates that the ZIF-8 needs a certain time to grow and the surface modifier can inhibit the growth of the ZIF-8.
EXAMPLE six
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
and 5, adding 10mg of F-68 into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the organic metal framework material which is dispersed in water and is surface-modified with the F-68.
Experimental results show that the ZIF-8 modified by F-68 has a particle size of about 50 nm, is square and has high dispersibility in water.
EXAMPLE seven
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
and 5, adding 10mg of F-108 into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the organic metal framework material which is dispersed in water and is surface-modified with the F-108.
Experimental results show that the ZIF-8 modified by F-108 has a square particle size of about 50 nm and high dispersibility in water.
Example eight
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
and 5, adding 10mg of PVP into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the organic metal framework material which is dispersed in water and is surface-modified by PVP.
As shown in FIG. 5, the ZIF-8 modified with PVP had a particle size of about 50 nm, was square and had high dispersibility in water.
Example nine
The invention relates to a preparation method of a high-dispersity organic metal framework nano material, which comprises the following steps:
step 1, preparing 1mL of 1.32 mol/L2-methylimidazole water solution, and stirring and dissolving the 2-methylimidazole water solution;
step 2, adding 400 mu L of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 1 mg/mL into the solution and stirring for 10 minutes;
step 3, adding 1mL of 24mmol/L zinc nitrate nonahydrate aqueous solution into the solution and keeping stirring for 10 minutes;
step 4, stopping stirring the solution, and naturally standing the obtained sample at room temperature for 24 hours;
step 5, 10mg of Brij@S100, adding the solution into the solution, stirring for 6 hours, and dialyzing and purifying to obtain the surface-modified Brij dispersed in water@S100.
The experimental result shows that the product is subjected to Brij@The ZIF-8 modified by S100 has the particle size of about 50 nm, is square and has high dispersibility in water.
In conclusion, the preparation method of the high-dispersity organic metal framework nano material is simple to operate and good in repeatability, can remarkably improve the stability and the dispersity of the organic metal framework material in water, has the particle size of less than 100 nm, and can be used for constructing a biological probe, so that the possibility is provided for subsequent biomedical application.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.
Claims (9)
1. A preparation method of a high-dispersity organic metal framework nano material is characterized by comprising the following steps: the preparation method comprises the following steps:
step 1, stirring and dissolving a certain amount of 2-methylimidazole in water;
step 2, adding a certain amount of hexadecyl trimethyl ammonium bromide aqueous solution into the step 1 and keeping stirring for a certain time;
step 3, adding a certain amount of zinc nitrate nonahydrate aqueous solution into the step and maintaining stirring for a certain time;
step 4, stopping stirring, and naturally standing the obtained sample at room temperature for a period of time;
and 5, adding a certain amount of polymer surfactant into the mixture obtained in the step 4, stirring and maintaining for a certain time, and dialyzing and purifying to obtain the surface-modified organic metal framework material dispersed in water.
2. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 1, the concentration of 2-methylimidazole is 1.32 mol/L, and the amount of 2-methylimidazole is 1 mL.
3. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 2, the concentration of the aqueous solution of cetyltrimethylammonium bromide was 1 mg/mL, and the amount of the aqueous solution of cetyltrimethylammonium bromide was 400 μ L.
4. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 3, the concentration of the zinc nitrate nonahydrate aqueous solution is 24mmol/L, and the amount of the zinc nitrate nonahydrate aqueous solution is 1 mL.
5. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: the stirring time in the steps 1, 2 and 3 is 10 min.
6. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 4, the natural standing time is 0-24 h.
7. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in said step 5, the polymeric surfactant is Pluronic@F-127、Pluronic@F-108、Pluronic@F-68, polyvinylpyrrolidone or polyoxyethylene (100) octadecyl ether.
8. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 5, the amount of the polymeric surfactant is 10 mg.
9. The method for preparing high-dispersity organic metal framework nano material according to claim 1, wherein the method comprises the following steps: in the step 5, the stirring time is 6 h.
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| CN113713725A (en) * | 2021-09-03 | 2021-11-30 | 杭州恒毅智创科技有限公司 | Preparation method of hollow core-shell cubic zinc oxide/cobaltosic oxide/zinc oxide nano composite material |
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| CN113713725B (en) * | 2021-09-03 | 2023-11-21 | 杭州恒毅智创科技有限公司 | Preparation method of hollow core-shell cube zinc oxide/cobaltosic oxide/zinc oxide nanocomposite |
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