CN106582562A - Magnetic graphene oxide composite nanomaterial and preparation method thereof - Google Patents
Magnetic graphene oxide composite nanomaterial and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a magnetic graphene oxide composite nanomaterial and a preparation method thereof. The material is prepared from graphene oxide, magnetic nano particles and a polydopamine shell layer; graphene oxide is connected with the magnetic nano particles wrapped by polydopamine, polydopamine serves as a connecting arm between the magnetic nano particles and graphene oxide, and the magnetic nano particles are immobilized on the surface of graphene oxide. When the material is prepared, the magnetic nano particles with stable citric acid are firstly prepared according to a solvothermal method, and then the surfaces of the magnetic nano particles are wrapped by the polydopamine shell layer in an alkaline buffer solution; finally, hydrogen bonds between polydopamine and graphene oxide and pi-pi interact, and the magnetic graphene oxide composite nanomaterial is prepared. The material has the common properties of graphene oxide and the magnetic nano particles, the hydrophilic performance of the material is improved through introduction of polydopamine, and the method is mild in condition and high in expansibility, and preparation is easy and convenient.
Description
Technical field
The present invention relates to a kind of magnetic oxygenated graphene composite nano material and preparation method.
Background technology
Since finding from 2004, Graphene relies on its excellent optics, electricity, mechanics and thermal property,
Widely paid close attention in the energy, catalysis and the field such as electronic device, Environmental Chemistry and biomedicine.Graphite
Alkene is the monoatomic layer two dimensional crystal for having carbon atom to constitute.Graphene oxide prepares Graphene as reducing process
Important presoma, it is similar to graphite-structure, possess bigger serface and special layer structure, simply in graphite
A large amount of oxy radicals, such as carboxyl, hydroxyl, epoxy and carbonyl etc. are introduced in alkene lamellar structure.Oxy radical
Presence improve the stability and hydrophilic of graphene oxide, also carry to prepare function graphene oxide composite material
For reaction site.Magnetic oxygenated Graphene due to combining the advantage of graphene oxide and magnetic nanoparticle and
Become a kind of new function material.From the point of view of document report, magnetic oxygenated graphene composite nano material is
It is successfully applied to dyestuff and pollutant absorption, medicament transport and release, the protein and DNA research such as immobilized.
In recent years magnetic oxygenated graphene composite nano material is received significant attention, and it is prepared mainly by contracting
Close the mode (Journal of Chromatography are A.2012,1254,8-13) of reagent covalent bonding.
Condensation reagent easily changes reaction solution pH during covalent bonding, causes graphene oxide easily to be reunited,
Make graphene oxide physics and chemical property produce change, affect magnetic oxygenated Graphene performance.Therefore develop
New magnetic oxygenated graphene preparation method is keeping graphene oxide single layer structure significant.DOPA
Amine easily aggregates into poly-dopamine in alkaline solution, and poly-dopamine contains the hydrophilic groups such as great amount of hydroxy group and amino,
And with big pi-conjugated system, easily produce hydrogen bond with graphene oxide and π-π interact, gather
Dopamine prepares magnetic oxygenated graphene composite nano material as linking arm, the graphite oxide in preparation process
Alkene easily keeps original chemical and physical features.Therefore in the present invention, the magnetic wrapped up based on dopamine is received
Rice grain and graphene oxide, being interacted using hydrogen bond and π-π, the magnetic oxygenated Graphene of development is compound to be received
Rice material.
The content of the invention
It is an object of the invention to provide a kind of magnetic oxygenated graphene composite nano material.The present invention another
Purpose is to provide the preparation method of the magnetic oxygenated graphene composite nano material.
The composite nano materials are made up of graphene oxide, magnetic nanoparticle and poly-dopamine shell,
The magnetic nanoparticle wrapped up by poly-dopamine is connected with graphene oxide, poly-dopamine is used as magnetic Nano
Linking arm between granule and graphene oxide, makes magnetic nanoparticle immobilized in surface of graphene oxide.
The magnetic nanoparticle is one or more in ferromagnetic material or paramagnet, described ferromagnetic
Property material be ferrum, cobalt, nickel, it is suitable or comprising one or more the alloy in ferrum, cobalt, nickel element
Magnetisable material is iron oxides or manganese, and magnetic nanoparticle is preferably ferroferric oxide nano granules.
The poly-dopamine shell refers to the poly-dopamine for being wrapped in magnetic nanoparticle surface.
The graphene oxide is multilamellar or monolayer, and the magnetic nanoparticle wrapped up by poly-dopamine connects
Between per layer of multilamellar graphene oxide or on layer；Or the one or both sides of single-layer graphene oxide.
The magnetic oxygenated graphene composite nano material is the disordered structure being stripped；
The magnetic nanoparticle particle diameter is 10-1000nm, and preferred magnetic nanoparticle particle diameter is 100-400
Nm, poly-dopamine shell Jacket thickness is 1-500nm, and preferred poly-dopamine shell Jacket thickness is 5-100
nm。
The present invention provides a kind of method for preparing the material：
First according to solvent-thermal method for the stable magnetic nanoparticle of citric acid, then according to many under alkalescence condition
The property that bar amine is easily polymerized, realizes wrapping up poly-dopamine layer on magnetic nanoparticle surface in buffer.
Finally utilize hydrogen bond and π-π between poly-dopamine and graphene oxide to interact, make magnetic nanoparticle
It is immobilized in surface of graphene oxide, prepare magnetic oxygenated graphene composite nano material.
Prepared by following methods, step 1) it is that the stable magnetic Nano of citric acid is prepared according to solvent-thermal method
Grain；Step 2) it is that poly-dopamine shell is wrapped up on magnetic nanoparticle surface in alkaline buffer solution；Step
3) it is that the magnetic nanoparticle that poly-dopamine is wrapped up is scattered in deionized water, graphene oxide is scattered in
In deionized water, subsequently two kinds of solution are mixed, at room temperature intense oscillations, make magnetic nanoparticle immobilized
In surface of graphene oxide, magnetic oxygenated graphene composite nano material is prepared.
Concrete technical scheme is：
Step 1) the stable magnetic nanoparticle of citric acid preparation：In ethylene glycol, six water and trichlorine are added
Change ferrum (FeCl3.6H2O) and sodium citrate, anhydrous sodium acetate is subsequently adding, strong agitation after ultrasound is prepared into
To uniform solution, finally it is fitted in ptfe autoclave, pressure is 5-10MPa, at 200-240 DEG C
Lower reaction 10-14h, product deionized water and dehydrated alcohol are alternately cleaned, vacuum drying, prepare institute
Obtain magnetic nanoparticle.
Step 2) poly-dopamine coated magnetic nano-particle (Fe3O4/ PDA) prepare：By magnetic nanoparticle point
Dissipate in Tris-HCl buffer, pH is controlled between 8.0-8.5, is subsequently adding dopamine, shaken well
Afterwards, in 25-37 DEG C of stirred in water bath reaction 2-6h, after reaction terminates, product deionized water and anhydrous
Ethanol is alternately cleaned, vacuum drying, prepares the magnetic nanoparticle of poly-dopamine parcel.
Step 3) magnetic oxygenated graphene composite nano material (Fe3O4/ PDA/GO) prepare：Fe3O4/ PDA point
Dissipate in deionized water, graphene oxide be scattered in deionized water, subsequently, two kinds of solution are mixed,
At room temperature intense oscillations 2-24h, reacts after terminating, and deionized water and dehydrated alcohol replace wash products,
After vacuum drying, magnetic oxygenated graphene composite nano material is prepared.
In above-mentioned technical proposal, it is preferred that step 1) in FeCl3.6H2O：Sodium citrate：Anhydrous sodium acetate
Mass ratio 1:1:1-1:10:10.
Step 2) in dopamine and step 1) quality of magnetic nanoparticle that obtains is than scope 1:1-1:10.
Step 3) in mixed solution, graphene oxide and Fe3O4The mass ratio of/PDA is 1:10-10:1.
In the preparation method of the present invention, more preferably operating condition is：
Step 1) in ethylene glycol, add 1 part of six water and ferric chloride (FeCl3.6H2) and 1-10 part Fructus Citri Limoniaes O
Sour sodium, is subsequently adding 1-10 part anhydrous sodium acetates, strong agitation 30-60min after ultrasonic 30-60min,
Uniform solution is prepared, is finally fitted in ptfe autoclave, pressure is 5-10MPa,
10-14h is reacted at 200-240 DEG C, products therefrom deionized water and dehydrated alcohol are alternately cleaned, cleaning time
Number is 3-10 time, and vacuum drying, baking temperature is 60-100 DEG C, and drying time is 12-24h, is prepared into
To the magnetic nanoparticle that citric acid is stable.
Step 2) poly-dopamine coated magnetic nano-particle (Fe3O4/ PDA) preparation method, magnetic nanoparticle
In being scattered in 10～100mM Tris-HCl buffer, pH is controlled between 8.0-8.5, is subsequently adding DOPA
Amine, the quality that dopamine is added is step 1) the stable magnetic nanoparticle of citric acid for preparing adds quality
Between 0.1-10 times, after shaken well, in 25-37 DEG C of stirred in water bath reaction 2-6h, after reaction terminates,
Product deionized water and dehydrated alcohol are alternately cleaned, and wash number is 3-10 time, and vacuum drying is dried temperature
Spend for 60-100 DEG C, drying time is 12-24h, the poly-dopamine coated magnetic nano-particle for preparing.
Step 3) magnetic oxygenated graphene composite nano material (Fe3O4/ PDA/GO) preparation method, Fe3O4/PDA
In being scattered in deionized water so as to which ultimate density is 0.5-5.0mg/mL.By graphene oxide be scattered in from
In sub- water so as to ultimate density 0.5-5.0mg/mL.Subsequently, two kinds of solution are mixed, at room temperature strongly
Vibration 2-24h, by noncovalent interaction magnetic oxygenated graphene composite nano material is prepared.After reaction terminates,
Product deionized water and dehydrated alcohol are alternately cleaned, and wash number is 3-10 time, and vacuum drying is dried temperature
Spend for 60-100 DEG C, drying time is 12-24h, the magnetic oxygenated Graphene composite Nano material for preparing
Material.
Magnetic nanoparticle of the present invention is stable through citric acid, and a large amount of carboxyls are contained on surface, possess excellent
Different bio-compatibility and hydrophilic.Poly-dopamine is answered as linking arm for preparing magnetic oxygenated Graphene
Nano material is closed, composite nano materials Stability Analysis of Structures possesses the common of magnetic nanoparticle and graphene oxide
Property.
Application of the material that the present invention is provided as the immobilized substrate, carrier and adsorbent of feature aglucon.
Material of the present invention and preparation method have the following advantages：
1) simplicity, mild condition, expansibility are prepared strong；
2) it is the immobilized substrate there is provided high-specific surface area of functional molecular；
3) magnetic oxygenated Graphene is prepared using non-covalent bonding method, maintains graphene oxide chemical property,
Avoid co-precipitation and the disruptive oxidation Graphene physicochemical properties of covalent bonding method；
4) magnetic oxygenated graphene composite nano material possesses the common point of graphene oxide and magnetic nanoparticle
Matter, and the introducing of poly-dopamine improves material hydrophilic performance.
5) dispersibility and hydrophilic of magnetic oxygenated graphene composite nano material prepared by the method are preferable, table
A large amount of carboxyls are contained in face, and bio-compatibility is preferable.
Description of the drawings
Fig. 1 prepares schematic diagram for magnetic oxygenated graphene composite nano material, and wherein magnetic nanoparticle is Fe3O4,
Citric acid contains a large amount of carboxyls as stabilizer, magnetic nanoparticle surface.
Fig. 2 be the magnetic nanoparticle transmission electron microscope picture of embodiment 1, magnetic nanoparticle good dispersion, particle diameter
Average out to 150nm.
Fig. 3 be the poly-dopamine coated magnetic nano-particle transmission electron microscope picture of embodiment 1, poly-dopamine thickness degree
About 8nm.
Fig. 4 is the magnetic oxygenated graphene composite nano material transmission electron microscope picture of embodiment 1, and poly-dopamine is wrapped up
Magnetic nanoparticle is scattered in surface of graphene oxide.
Specific embodiment
The present invention provides following embodiments to be used to illustrate the present invention, but is not intended to limit protection scope of the present invention,
Although being described in detail to the present invention with reference to the embodiment, for a person skilled in the art,
It still can modify to the technical scheme described in foregoing embodiments, or to which part technology
Feature carries out equivalent, and all any modifications within the spirit and principles in the present invention, made, equivalent are replaced
Change, improve, should be included within the scope of the present invention.
Embodiment 1
1. the preparation of magnetic oxygenated graphene composite nano material：As shown in Figure 1, the water of 1.08g six is weighed
With ferric chloride and 0.2g sodium citrates, in being scattered in 20mL ethylene glycol, 1.2g is subsequently adding anhydrous
Sodium acetate, strong agitation 30min after ultrasonic 30min prepares uniform solution, finally loads poly- four
In fluorothene reactor, pressure 5MPa reacts 10h at 200 DEG C, products therefrom deionized water and
Dehydrated alcohol alternately cleaning three times, vacuum drying, baking temperature is 60 DEG C, and drying time is 12h, is prepared
Obtain the stable magnetic nanoparticle of citric acid.
Weigh 10mg magnetic nanoparticles to be scattered in 50mL 10mM Tris-HCl buffer, solution
PH is 8.0, is subsequently adding 10mg dopamine, after shaken well, in 25 DEG C of stirred in water bath reaction 2h,
After reaction terminates, product deionized water and dehydrated alcohol are alternately cleaned three times, vacuum drying, baking temperature
For 60 DEG C, drying time is 12h, the poly-dopamine coated magnetic nano-particle for preparing.
Prepare magnetic oxygenated graphene composite nano material；Weigh 6mg Fe3O4/ PDA be scattered in 6mL go from
In sub- water so as to ultimate density 1mg/mL；Weigh 6mg graphene oxides and be scattered in 12mL deionized waters
In so as to ultimate density 0.5mg/mL, intense oscillations 8h at room temperature after the mixing of two kinds of solution, magnetic is inhaled
It is attached, alternately cleaning three times of product deionized water and dehydrated alcohol, vacuum drying, baking temperature is 60 DEG C,
Drying time is 12h, and products therefrom is magnetic oxygenated graphene composite nano material.
2. material characterization：Fig. 2 is magnetic nanoparticle transmission electron microscope picture, and Fig. 3 is poly-dopamine coated magnetic
Nano-particle transmission electron microscope picture, Fig. 4 is magnetic oxygenated graphene composite nano material transmission electron microscope picture.From saturating
Radio mirror can be seen that and wrap up one layer of 8nm thickness poly-dopamine layer, poly- DOPA on magnetic nanoparticle surface
Amine is dispersed in surface of graphene oxide, forms magnetic oxygenated graphene composite nano material, material synthesis
Magnetic nanoparticle and property both graphene oxide, and the introducing of poly-dopamine improves Material cladding
Material hydrophilic performance.Non-covalent bonding method prepares magnetic oxygenated Graphene, maintains graphene oxide chemistry
Property, it is to avoid with co-precipitation and covalent bonding method disruptive oxidation Graphene physicochemical properties.
Magnetic oxygenated graphenic surface property is characterized with Zeta electric potential, magnetic nanoparticle Zeta electric potential is
15.6 ± 4.77mv, after magnetic nanoparticle wraps up poly-dopamine, potential to negative movement, explanation are rolled into
Work(, after magnetic oxygenated graphene composite nano material is formed, potential is further to negative movement, surface negative electricity
Gesture, is conducive to further carrying electropositive polyethyleneimine, polyethyleneimine surface by electrostatic interaction
A large amount of amino contribute to the immobilized of the functional moleculars such as aptamer.
Table 1 is magnetic nanoparticle, poly-dopamine coated magnetic nano-particle, magnetic oxygenated Graphene are combined
Nano material Zeta electric potential.After magnetic nanoparticle wraps up poly-dopamine, potential to negative charge is moved, and is become
For -21.0 ± 4.11mv, after magnetic oxygenated graphene composite nano material is formed, potential is further to negative
Electric charge is moved, and is changed into -37.3 ± 6.82mv.
Potential change in the magnetic oxygenated Graphene preparation process of table 1
Embodiment 2
It is prepared by magnetic oxygenated graphene composite nano material：As shown in Figure 1, the water of 1.08g six and trichlorine are weighed
Change ferrum and 0.2g sodium citrates, in being scattered in 20mL ethylene glycol, be subsequently adding 1.2g anhydrous sodium acetates,
Strong agitation 30min after ultrasonic 30min, prepares uniform solution, finally loads politef anti-
In answering kettle, pressure 5MPa reacts 14h, products therefrom deionized water and dehydrated alcohol at 200 DEG C
Alternately cleaning three times, vacuum drying, baking temperature is 60 DEG C, and drying time is 12h, prepares Fructus Citri Limoniae
The stable magnetic nanoparticle of acid.
Weigh 10mg magnetic nanoparticles to be scattered in 50mL10mM Tris-HCl buffer, pH value of solution
For 8.0,10mg dopamine is subsequently adding, after shaken well, in 25 DEG C of stirred in water bath reaction 6h, instead
After should terminating, product deionized water and dehydrated alcohol are alternately cleaned three times, vacuum drying, and baking temperature is
60 DEG C, drying time is 12h, the poly-dopamine coated magnetic nano-particle for preparing.
Prepare magnetic oxygenated graphene composite nano material；Weigh 6mg Fe3O4/ PDA be scattered in 6mL go from
In sub- water so as to ultimate density 1mg/mL；Weigh 6mg graphene oxides and be scattered in 12mL deionized waters
In so as to ultimate density 0.5mg/mL, intense oscillations 8h at room temperature after the mixing of two kinds of solution, magnetic is inhaled
It is attached, alternately cleaning three times of product deionized water and dehydrated alcohol, vacuum drying, baking temperature is 60 DEG C,
Drying time is 12h, and products therefrom is magnetic oxygenated graphene composite nano material.
Embodiment 3
It is prepared by magnetic oxygenated graphene composite nano material：
As shown in Figure 1, the water of 1.08g six and ferric chloride and 0.2g sodium citrates are weighed, 20mL is scattered in
In ethylene glycol, 1.2g anhydrous sodium acetates are subsequently adding, prepared by strong agitation 30min after ultrasonic 30min
Uniform solution is obtained, is finally fitted in ptfe autoclave, pressure 5MPa reacts at 200 DEG C
Alternately cleaning three times of 10h, products therefrom deionized water and dehydrated alcohol, are vacuum dried, and baking temperature is
60 DEG C, drying time is 12h, prepares the stable magnetic nanoparticle of citric acid.
Weigh 10mg magnetic nanoparticles to be scattered in 50mL10mM Tris-HCl buffer, pH value of solution
For 8.0,20mg dopamine is subsequently adding, after shaken well, in 25 DEG C of stirred in water bath reaction 2h,
Alternately cleaning three times of product deionized water and dehydrated alcohol, vacuum drying, baking temperature is 60 DEG C, is dried
Time is 12h, the poly-dopamine coated magnetic nano-particle for preparing.
Prepare magnetic oxygenated graphene composite nano material；Weigh 6mg Fe3O4/ PDA be scattered in 6mL go from
In sub- water so as to ultimate density 1mg/mL；Weigh 6mg graphene oxides and be scattered in 12mL deionized waters
In so as to ultimate density 0.5mg/mL, intense oscillations 8h at room temperature after the mixing of two kinds of solution, magnetic is inhaled
It is attached, alternately cleaning three times of product deionized water and dehydrated alcohol, vacuum drying, baking temperature is 60 DEG C,
Drying time is 12h, and products therefrom is magnetic oxygenated graphene composite nano material.
Claims (9)
1. a kind of magnetic oxygenated graphene composite nano material, it is characterised in that：The material is by graphite oxide
Alkene, magnetic nanoparticle and poly-dopamine shell are constituted, and are connected with graphene oxide and are wrapped up by poly-dopamine
Magnetic nanoparticle, poly-dopamine makes as the linking arm between magnetic nanoparticle and graphene oxide
Magnetic nanoparticle is immobilized in surface of graphene oxide.
2. magnetic oxygenated graphene composite nano material according to claim 1, it is characterised in that：Institute
Magnetic nanoparticle is stated for one or more in ferromagnetic material or paramagnet, the ferromagnetic material
For ferrum, cobalt, nickel, or comprising one or more the alloy in ferrum, cobalt, nickel element, paramagnetism thing
Matter is iron oxides or manganese, and magnetic nanoparticle is preferably ferroferric oxide nano granules.
3. magnetic oxygenated graphene composite nano material according to claim 1, it is characterised in that：Institute
It is multilamellar or monolayer to state graphene oxide, and the magnetic nanoparticle wrapped up by poly-dopamine is connected to multilamellar
Between per layer of graphene oxide or on layer；Or the one or both sides of single-layer graphene oxide.
4. magnetic oxygenated graphene composite nano material according to claim 1, it is characterised in that：Institute
It is the disordered structure being stripped to state magnetic oxygenated graphene composite nano material；
The magnetic nanoparticle particle diameter is 10-1000nm, and poly-dopamine shell Jacket thickness is 1-500nm.
5. the preparation method of the arbitrary magnetic oxygenated graphene composite nano material of a kind of claim 1-4,
It is characterized in that：Prepared by following methods, step 1) it is that the stable magnetic of citric acid is prepared according to solvent-thermal method
Property nano-particle；Step 2) it is that poly-dopamine shell is wrapped up on magnetic nanoparticle surface in alkaline buffer solution
Layer；Step 3) it is that the magnetic nanoparticle that poly-dopamine is wrapped up is scattered in deionized water, by graphite oxide
Alkene is scattered in deionized water, subsequently mixes two kinds of solution, and at room temperature intense oscillations, make magnetic Nano
Granule is immobilized in surface of graphene oxide, prepares magnetic oxygenated graphene composite nano material.
6. preparation method according to claim 5, it is characterised in that：
Step 1) the stable magnetic nanoparticle of citric acid preparation：In ethylene glycol, six water and trichlorine are added
Change ferrum (FeCl3.6H2O) and sodium citrate, anhydrous sodium acetate is subsequently adding, strong agitation after ultrasound is prepared into
To uniform solution, finally it is fitted in ptfe autoclave, pressure is 5-10MPa, at 200-240 DEG C
Lower reaction 10-14h, product deionized water and dehydrated alcohol are alternately cleaned, vacuum drying, prepare institute
Obtain magnetic nanoparticle；
Step 2) poly-dopamine coated magnetic nano-particle (Fe3O4/ PDA) prepare：By magnetic nanoparticle point
Dissipate in Tris-HCl buffer, pH is controlled between 8.0-8.5, is subsequently adding dopamine, shaken well
Afterwards, in 25-37 DEG C of stirred in water bath reaction 2-6h, after reaction terminates, product deionized water and anhydrous
Ethanol is alternately cleaned, vacuum drying, prepares the magnetic nanoparticle of poly-dopamine parcel；
Step 3) magnetic oxygenated graphene composite nano material (Fe3O4/ PDA/GO) prepare：Fe3O4/ PDA point
Dissipate in deionized water, graphene oxide be scattered in deionized water, subsequently, two kinds of solution are mixed,
At room temperature intense oscillations 2-24h, reacts after terminating, and deionized water and dehydrated alcohol replace wash products,
After vacuum drying, magnetic oxygenated graphene composite nano material is prepared.
7. preparation method according to claim 6, it is characterised in that：Step 1) in FeCl3.6H2O：
Sodium citrate：The mass ratio 1 of anhydrous sodium acetate:1:1-1:10:10；
Step 2) in dopamine and step 1) mass ratio 1 of magnetic nanoparticle that obtains:1-1:10；
Step 3) in mixed solution, graphene oxide and Fe3O4The mass ratio of/PDA is 1:10-10:1.
8. preparation method according to claim 6, it is characterised in that：
Step 1) in ethylene glycol, add 1 part of six water and ferric chloride (FeCl3.6H2) and 1-10 part Fructus Citri Limoniaes O
Sour sodium, is subsequently adding 1-10 part anhydrous sodium acetates, strong agitation 30-60min after ultrasonic 30-60min,
Uniform solution is prepared, is finally fitted in ptfe autoclave, pressure is 5-10MPa,
10-14h is reacted at 200-240 DEG C, products therefrom deionized water and dehydrated alcohol are alternately cleaned, cleaning time
Number is 3-10 time, and vacuum drying, baking temperature is 60-100 DEG C, and drying time is 12-24h, is prepared into
To the magnetic nanoparticle that citric acid is stable；
Step 2) poly-dopamine coated magnetic nano-particle (Fe3O4/ PDA) preparation method, magnetic nanoparticle
In being scattered in 10～100mM Tris-HCl buffer, pH is controlled between 8.0-8.5, is subsequently adding DOPA
Amine, the quality that dopamine is added is step 1) the stable magnetic nanoparticle of citric acid for preparing adds quality
Between 0.1-10 times, after shaken well, in 25-37 DEG C of stirred in water bath reaction 2-6h, after reaction terminates,
Product deionized water and dehydrated alcohol are alternately cleaned, and wash number is 3-10 time, and vacuum drying is dried temperature
Spend for 60-100 DEG C, drying time is 12-24h, the poly-dopamine coated magnetic nano-particle for preparing；
Step 3) magnetic oxygenated graphene composite nano material (Fe3O4/ PDA/GO) preparation method, Fe3O4/PDA
In being scattered in deionized water so as to which ultimate density is 0.5-5.0mg/mL, by graphene oxide be scattered in from
In sub- water so as to ultimate density 0.5-5.0mg/mL, subsequently, two kinds of solution are mixed, at room temperature strongly
Vibration 2-24h, by noncovalent interaction magnetic oxygenated graphene composite nano material is prepared, after reaction terminates,
Product deionized water and dehydrated alcohol are alternately cleaned, and wash number is 3-10 time, and vacuum drying is dried temperature
Spend for 60-100 DEG C, drying time is 12-24h, the magnetic oxygenated Graphene composite Nano material for preparing
Material.
9. a kind of arbitrary material of claim 1-4 as the immobilized substrate of feature aglucon, carrier and
The application of adsorbent.
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