CN110284151A - A kind of method of electrochemistry rapid synthesis bimetallic ZIF-8 - Google Patents
A kind of method of electrochemistry rapid synthesis bimetallic ZIF-8 Download PDFInfo
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- CN110284151A CN110284151A CN201910607810.6A CN201910607810A CN110284151A CN 110284151 A CN110284151 A CN 110284151A CN 201910607810 A CN201910607810 A CN 201910607810A CN 110284151 A CN110284151 A CN 110284151A
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Abstract
The invention discloses a kind of methods of electrochemical process rapid synthesis bimetallic ZIF-8 material, generated time successfully can be reduced to 5 min using this method.Specific step is as follows for the synthetic method: taking 2-methylimidazole and tetrabutylammonium bromide and a certain amount of different metal salt to be placed in a beaker, adds n,N-Dimethylformamide and ethyl alcohol, stirring ultrasound makes it dissolve uniformly；Yin-yang two-stage is done with zinc metal sheet, uniformly mixed solution works as electrolyte, and energization is reacted；1 time and 2 times are washed respectively by the product centrifugation removal supernatant liquid after reaction, then with n,N-Dimethylformamide and ethyl alcohol；High temperature drying obtains bimetallic ZIF-8 solid powder.The present invention substantially reduces the reaction time by the irregular spherical bimetallic ZIF-8 of electrochemical process synthesis nano, not only easy to operate, mild condition, improves synthetic yield.The material being synthesized metal containing there are two types of, and ratio is controllable.
Description
Technical field
The invention belongs to the quick preparation fields of bimetallic metal organic framework, and in particular to a kind of electrochemistry is quickly closed
At the method for bimetallic ZIF-8 material.
Background technique
In recent years, metal organic framework compound (Metal Organic Framework, MOFs) as it is a kind of it is organic-
The porous material of inorganic hybridization has received widespread attention, and becomes one of research hotspot and forward position of field of new materials.The material is
It is connected with each other by inorganic metal center (metal ion or metal cluster) and the organic ligand of bridging by self assembly, one kind of formation
Crystalline state porous material with periodic network structure.It is different from inorganic porous material, organic matches also different from general
Object is closed, has the rigidity of inorganic material and the flexible characteristic of organic material concurrently.Its high porosity having, low-density, Large ratio surface
Product, duct rule, aperture is adjustable and structure diversity and tailorability that it is presented in terms of modern material research is huge
Development potentiality and tempting development prospect.Such as adsorbing separation, gas storage, organic catalysis, photoelectromagnetic material, the chemistry biography of gas
The fields such as sensor.
However, the defects of unstability of structure, restricts the development and application of MOFs.Therefore, to traditional MOFs material into
Row functional modification is to improve the performance and stability of material as research tendency from now on.The self assembly mode of MOFs changes for it
Property provide it is a variety of may.In order to increase the stability of MOFs and the diversity of performance, blending constituent MOFs (Mixed-
Component MOFs, MC-MOFs) start to be paid close attention to by researcher.MC-MOFs can be divided into two major classes: multiple ligand MOFs and more
Metal center MOFs.Compared to monometallic MOFs, more metal MOFs show performance unique and abundant, and metal component
It is more, more easily show more special natures.Such as bimetallic MIL-100 (Fe-Mn) is to NOxSynthesize NH3There is good catalysis
Performance, the NO at 260 DEG CxConversion ratio can be up to 96%, this is monometallic MIL-100 (Fe) and MIL-100 (Mn) up to not
It arrives.The MOFs material of bimetal-doped maintains the consistent structure of corresponding monometallic MOFs material and duct, and two kinds of metals
It is substantially uniform to be distributed in lattice, there is coordination and crystalline rate faster, so that its ratio in crystal is higher than reaction
Solution.Coordination of the bimetallic in same frame structure promotes the generation of more matter crystal internal defects, so that bimetallic MOFs
The specific surface area of material has the promotion in certain limit relative to monometallic material.In addition, bimetal-doped MOFs is in certain realities
The various performances of border application aspect have been over certain corresponding monometallic MOFs materials.For example, Yang et al. synthesis with equal
Benzenetricarboxylic acid is the bimetallic MOF (Co/Fe) of ligand, when it detects H as catalyst2O2When, it is right within the scope of 10~100 μM
H2O2Detection be limited to 5 μM of (R2=0.997), effect is higher than corresponding monometallic MOFs material.Zhang et al. by pair
The Co-Fe-P composite material that Co/Fe-MOFs progress phosphorating treatment obtains equally is shown preferable when for OER catalyst
Catalytic activity and stability.
Current bimetallic synthetic method is broadly divided into two major classes, one kettle way and metal center method of substitution.Generally use one
Pot method is added to metal ion and organic ligand in specific dicyandiamide solution through dissolution thermal method or ultrasonic wave added, microwave
Auxiliary, steam auxiliary etc. are synthesized, and typical self assembling process is belonged to.M (NO is added by coordinating in Kaur etc.3)·H2O (M=
Co, Zn) and adjust the method controlledly synthesis Co of Co/Zn ratioxZn100-x-ZIF-8.Controllable method of substitution is by other metals
Metal in MOFs has been synthesized so that a kind of method for obtaining bimetallic MOFs material, is generally completed under liquid-phase condition to replace.
Time-consuming for above two method, and energy consumption is more, complicated for operation.Use is different from the new method of above two method i.e. to the present invention for the first time
Electrochemical process rapid, high volume synthesizes bimetallic MOFs material.
Summary of the invention
The main purpose of the present invention is to provide a kind of methods of fast and convenient synthesis bimetallic MOFs material, it is intended to efficiently
Low energy consumption, which controllably synthesizes, has bimetallic metal-organic framework materials, while improving yield.
The purpose of the present invention is achieved through the following technical solutions.
A kind of method that rapid synthesis has bimetallic metal-organic framework materials, includes the following steps:
Step 1, the tetrabutyl phosphonium bromide ammonia for taking imidazoles with a conjugated structure, serving as template and increasing electric conductivity and certain
The different metal salt (including nickel nitrate, ferric nitrate and copper nitrate) of amount adds organic solvent N, N- diformazan in 50mL beaker
Base formamide (DMF) and ethyl alcohol, ultrasound make it be mixed into dispersion liquid；
Step 2 takes two rectangle zinc metal sheet sand paper polishing grindings, then is dried in the air with ethanol washing to the smooth free from admixture in surface
It is dry stand-by；
Step 3 will carry out the yin-yang two-stage that pretreated zinc metal sheet serves as power supply to surface in step 2, be inserted into step 1
In in prepared solution, power on, terminate experiment after reacting a period of time；
Product centrifugation after step 3 reaction is removed supernatant liquid by step 4, and n,N-Dimethylformamide washing one is added
It is secondary, add ethanol washing twice；
Step 5, by the product after step 4 washing be 60~100 DEG C in temperature at dry 1~3h, different face can be obtained
The MOFs powder of color.
Preferably, in step 1, the additional amount of the n,N-Dimethylformamide (DMF) is 10mL；The addition of the ethyl alcohol
Amount is 40mL；The ultrasonic time is 6min.
Preferably, sand paper specification is 1500 mesh in step 2.
Preferably, voltage-regulation amount described in step 3 is 5V；The reaction time is 3h.
Preferably, centrifugal rotational speed described in step 4 is 6000~10000r/min；The centrifugation time is 5~10min.
Preferably, temperature is preferably 70~90 DEG C in step 5 described in step 5；The drying time is 1~2h.
Preferably, step 1~step 4 carries out at normal temperature.
Preferably, the additive amount of the conductive salt is 0.5g, and the additive amount of the added metal salt is 0.02~0.08g.
Compared with the existing technology, the invention has the advantages that and effect:
(1) method of the invention uses electrochemical process to synthesize bimetallic ZIF-8 material for the first time, and the present invention only passes through outer power-up
In the case where, can at normal temperature rapid synthesis have bimetal-doped metal-organic framework materials, easy to operate, condition
Mildly, avoid heating, ultrasound and etc., low energy consumption, energy saving.
(2) relatively reported synthetic yield, method of the invention yield with higher.
(3) present invention can control two kinds of metals in bimetallic ZIF-8 material by adjusting the additive amount of added metal salt
Content and ratio.
Detailed description of the invention
Fig. 1 be ZIF-8 material synthesize using conventional hydrothermal method and the preparation of embodiment 1 bimetallic Zn/Ni-ZIF-8,
X-ray diffraction (XRD) figure of Zn/Fe-ZIF-8, Zn/Cu-ZIF-8 material.
Fig. 2 is the scanning of bimetallic Zn/Ni-ZIF-8, Zn/Cu-ZIF-8, Zn/Fe-ZIF-8 material prepared by embodiment 1
Electronic Speculum (SEM) photo.
Fig. 3 is the elemental analysis (EDS) of bimetallic Zn/Ni-ZIF-8 material prepared by the embodiment of the present invention 1.
Fig. 4 is the elemental analysis (EDS) of bimetallic Zn/Fe-ZIF-8 material prepared by the embodiment of the present invention 1.
Fig. 5 is the elemental analysis (EDS) of bimetallic Zn/Cu-ZIF-8 material prepared by the embodiment of the present invention 1.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, but the scope of protection of present invention is not
It is confined to the range of embodiment statement.
Embodiment 1
Under room temperature, the zinc metal sheet of 1500 mesh sand paper polisheds is cooked into yin-yang the two poles of the earth, by 0.1g 2-methylimidazole, 0.5g is conductive
Salt and 0.08g NiNO3·6H2O is dissolved in the ethanol solution of 10mLDMF and 40mL, and ultrasonic 6min does dicyandiamide solution.Connect electricity
Source, adjusting response voltage are 5V, reaction time 3h, and products therefrom washs 1 time and 2 times with DMF and ethyl alcohol respectively, centrifugation 6min,
Revolving speed is 8000r/min.Gained is placed and is labeled as with the dry 1h of 80 DEG C of drying boxes, obtained bimetallic Zn/Ni-ZIF-8 material
Sample A1.
Embodiment 2
Under room temperature, the zinc metal sheet of 1500 mesh sand paper polisheds is cooked into yin-yang the two poles of the earth, by 0.1g 2-methylimidazole, 0.5g is conductive
Salt and 0.06gFe (NO3)3·9H2O is dissolved in the ethanol solution of 10mLDMF and 40mL, and ultrasonic 6min does dicyandiamide solution.It connects
Power supply, adjusting response voltage are 5V, reaction time 3h, and products therefrom washs 1 time and 2 times with DMF and ethyl alcohol respectively, centrifugation
6min, revolving speed 8000r/min.By gained placement and the dry 1h of 80 DEG C of drying boxes, bimetallic Zn/Fe-ZIF-8 material is made,
Labeled as sample A2.
Embodiment 3
Under room temperature, the zinc metal sheet of 1500 mesh sand paper polisheds is cooked into yin-yang the two poles of the earth, by 0.1g 2-methylimidazole, 0.5g is conductive
Salt and 0.08g Cu (NO3)2·3H2O is dissolved in the ethanol solution of 10mL DMF and 40mL, and ultrasonic 6min does dicyandiamide solution.It connects
Energization source, adjusting response voltage are 5V, reaction time 3h, and products therefrom washs 1 time and 2 times with DMF and ethyl alcohol respectively, centrifugation
6min, revolving speed 8000r/min.By gained placement and the dry 1h of 70 DEG C of drying boxes, bimetallic Zn/Cu-ZIF-8 material is made,
Labeled as sample A3.
The characterization result of the bimetallic ZIF-8 material prepared using embodiment 1,2,3 carries out effect of the invention as representative
Analysis, the analysis result of the bimetallic Zn/Cu-ZIF-8 material of other embodiments preparation do not mention one by one substantially with embodiment 1
For.
(1) crystal structure properties of the bimetallic ZIF-8 of rapid synthesis
Using the D/MAX-3BX model X-ray diffractometer of Japanese Rigaku company production to the crystal structure of the embodiment of the present invention 1
It is characterized.
Fig. 1 is that the ZIF-8 material synthesized using conventional hydrothermal method and embodiment 1, embodiment 2 and embodiment 3 are prepared respectively
Bimetallic Zn/Ni-ZIF-8, Zn/Fe-ZIF-8, Zn/Cu-ZIF-8 material X-ray diffractogram.From figure 1 it appears that
Compared with monometallic ZIF-8, there is the feature of stronger ZIF-8 metal organic framework in the sample that embodiment 1,2,3 is prepared
Diffraction maximum illustrates the ZIF-8 component in product there is higher crystallinity.
(2) the SEM figure of the bimetallic ZIF-8 of rapid synthesis
Using the S-4800 model scanning electron microscope of Shanghai Powerchip scientific instrument Co., Ltd production to of the invention real
The pattern for applying example 1 is characterized.
Fig. 2 is bimetallic Zn/Ni-ZIF-8, Zn/Fe-ZIF-8, Zn/Cu-ZIF-8, material prepared by embodiment 1,2,3
SEM figure.As can be seen from the figure bimetallic Zn/Ni-ZIF-8, Zn/Fe-ZIF-8, Zn/Cu-ZIF-8 of electrochemical process preparation
Pattern be it is irregular spherical, size is substantially in 100nm or so.
(4) elemental analysis of the bimetallic ZIF-8 of rapid synthesis
Using the S-4800 model scanning electron microscope of Shanghai Powerchip scientific instrument Co., Ltd production to of the invention real
It applies example and carries out elemental analysis.
Fig. 3 is the elemental analysis spectrogram of bimetallic Zn/Ni-ZIF-8 material prepared by embodiment 1.As can be seen from the figure
The element of the bimetallic Zn/Ni-ZIF-8 of electrochemical process preparation includes C, N, O, Zn, Ni.Prove that Ni element is successfully supported on
On the ZIF-8 of synthesis.
Fig. 4 is the elemental analysis spectrogram of the bimetallic of the preparation of embodiment 2, Zn/Fe-ZIF-8 material.As can be seen from the figure
The element of the bimetallic Zn/Fe-ZIF-8 of electrochemical process preparation includes C, N, O, Zn, Fe.Prove that Fe element is successfully supported on
On the ZIF-8 of synthesis.
Fig. 5 is the elemental analysis spectrogram of the bimetallic of the preparation of embodiment 3, Zn/Cu-ZIF-8 material.As can be seen from the figure
The element of the bimetallic Zn/Cu-ZIF-8 of electrochemical process preparation includes C, N, O, Zn, Cu.Prove that Cu element is successfully supported on
On the ZIF-8 of synthesis.
Above-described embodiment is the comparatively ideal embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications done under spiritual essence and principle of the invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. a kind of method of electrochemistry rapid synthesis bimetallic ZIF-8, it is characterised in that: steps are as follows:
Step 1 takes the imidazoles for serving as organic ligand, serves as template and increases the tetrabutyl phosphonium bromide ammonia of electric conductivity and a certain amount of
For different metal salt respectively in 50 mL beakers, adding n,N-Dimethylformamide (DMF) and ethyl alcohol, it is equal that ultrasound mixes it
It is even at dispersion liquid；
Step 2 takes two rectangle zinc metal sheet sand paper polishing grindings, then with ethanol washing to the smooth free from admixture in surface, dry to
With；
Step 3 will carry out the yin-yang two-stage that pretreated zinc metal sheet serves as power supply to surface in step 2, is inserted into step 1 and matches
In the solution made, power on, terminates experiment after reacting a period of time；
Product centrifugation after step 3 reaction is removed supernatant liquid by step 4, and n,N-Dimethylformamide, which is added, washed once, then
Ethanol washing is added twice；
Step 5, by the product after step 4 washing be 60 ~ 100 DEG C in temperature at dry 1 ~ 3 h, bimetallic ZIF- can be obtained
8 powder.
2. synthetic method according to claim 1, it is characterised in that: in the step 1, the conjugation imidazoles is 2- methyl
Imidazoles；The Cobalt salts are copper nitrate, ferric nitrate and nickel nitrate；The N,N-dimethylformamide (DMF) adds with ethyl alcohol
Entering amount altogether is 50 mL；The ultrasonic time is 5 ~ 15 min.
3. synthetic method according to claim 1, it is characterised in that: zinc metal sheet specification is long 5 cm in the step 2, wide
0.5 cm is with a thickness of 0.1 cm.
4. according to the method described in claim 1, it is characterized by: voltage-regulation amount described in the step 3 is 4 ~ 9 V；Institute
Stating the reaction time is 1 ~ 3 h.
5. synthetic method according to claim 1, it is characterised in that: centrifugal rotational speed described in the step 4 be 6000 ~
10000 r/min；The centrifugation time is 5 ~ 10 min.
6. synthetic method according to claim 1, it is characterised in that: temperature is preferred in step 5 described in the step 5
It is 70 ~ 90 DEG C；The drying time is 1 ~ 2 h.
7. synthetic method according to claim 1, it is characterised in that: the step 1 ~ step 4 carries out at normal temperature.
8. synthetic method according to claim 1, it is characterised in that: the ligand additive amount is 0.1 g, the Cu
(NO3)2·3H2O、Fe(NO3)3·9H2O、Ni(NO3)·6H2O additive amount is 0.02 ~ 0.1 g, and the additive amount of the conductive salt is
0.5 g。
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Cited By (1)
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| CN113461961A (en) * | 2021-07-15 | 2021-10-01 | 河南中医药大学 | For Fe3+High-selectivity Ag/Zn-ZIF-8 bimetal organic framework material |
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