A kind of zinc oxide/redox graphene aeroge and preparation method thereof
Technical field
The present invention relates to a kind of method preparing zinc oxide/redox graphene aeroge, belong to novel nano
Material and field of material preparation.Technique is simple, and low cost is practical, organic dirt in photocatalytic degradation water
The aspects such as dye thing have broad application prospects.
Background technology
Nanometer technology is 21 century particularly important scientific research field, and device based on nanometer technology etc. will
Revolutionary change is brought to every field, and in the basic nano structured unit of assemble nanometer device, two
It is indispensable for planting functional material strong, that structure is unique, and one is zinc oxide, and another kind is currently to process hand
Can heat Graphene, the two dimensional crystal of the most single Graphene atomic layer.Bi-material all has the photo electric of uniqueness
Can, the former has abundant low dimensional structures, and the latter has electricity, mechanics and the thermal conduction characteristic of excellence.
Aeroge is that a kind of density is ultralow, can keep water in a large number and don't can be dissolved in water, and can be swelling
Three-dimensional netted nano solid porous polymer material, has good electric conductivity and thermal conductivity.It was in 1931
Found by Kistler and propose.The preparation process of aeroge is relatively complicated, and under usual condition, it leads to before this
Cross the gel process of colloidal sol to make wet gel, afterwards through certain solvent switch, by surface in network space
The relatively large dissolution filter of tension force out, forms aeroges through a series of complex process the most again.
All superior functions based on aeroge, the research for its structure in recent years the most gradually increases, especially
Aerogel structure is applied to improve battery electrode performance, utilize its extra specific surface area as new catalyst or
Catalyst carrier processes the most serious water pollution problem, additionally, aerogel structure is in energy storage field,
The aspects such as pernicious gas absorption, Aero-Space all have the performance of brilliance, it is conceivable that, by zinc oxide, reduction
Graphene oxide composite material is expanded into three-dimensional aerogel structure, it will improves it further and leads in original application
Territory, the performance in terms of Degradation of Organo-pollutants in Water with Photo-catalysis etc..
Within 2013, it is published in the opinion " Self-Assembled of ACS Sustainable Chemistry&Engineering
Three-Dimensional Graphene-Based Aerogel with Embedded Multifarious Functional
Nanoparticles and Its Excellent Photoelectrochemical Activities " report a kind of employing water
Hot method one step is by TiO2Nano particle embeds and defines a kind of three-dimensional self assembly aerogel structure in Graphene, and
Predict this structure catalytic water under light illumination and produce H2In potential application.2009 at Appl.Phys.Lett
On deliver one about compound paper " the Vertically Aligned ZnO of Graphene and zinc oxide
Nanostructures Grown On Graphene Layers " report and utilize MOCVD at graphene film
The zinc oxide nano-wire array that surface deposition is vertical, the pattern of research zinc oxide controls and optical characteristics.But at present
Zinc oxide and graphene composite structure in these reports are substantially in the plane of a Graphene deposition oxygen
Change zinc, seldom realize developing zinc oxide while Graphene upper and lower surface, Graphene and oxidation more do not occur
Zinc is three-dimensional compound, as constituted aerogel structure.The most also there are some such as patent CN103482615A
" preparation method of a kind of foam-like Graphene-ZnO composite " is referred to answering of Graphene and zinc oxide
Close, including having made three-dimensional structure, but there is the problems such as temperature in building-up process is higher, be unfavorable for big face
Long-pending preparation.
In sum, current Graphene and the compound of zinc oxide are also only limited to single graphenic surface, really will
It is little that zinc oxide/redox graphene carries out being combined the report with prepared aeroge at three dimensions, so
The exploration of this respect will be work highly significant.
Summary of the invention
Technical problem: the present invention relates to a kind of zinc oxide/redox graphene aeroge and preparation method thereof, this
Bright be mostly in a plane based on current zinc oxide and Graphene are compound, use solvent-thermal method realize Graphene with
Zinc oxide is compound on three dimensions, the defect before preferably overcoming, and technique is simple, and low cost is practical
Property strong, have broad application prospects at aspects such as Degradation of Organo-pollutants in Water with Photo-catalysis.
Technical scheme: a kind of method preparing zinc oxide/redox graphene aeroge, the concrete step of described method
Rapid as follows:
1) preparation graphene oxide uniform dispersion in ethylene glycol;
2) addition soluble zinc salt, reducing agent, weak base reagent to dispersion liquid stirs;
3) above-mentioned mixed liquor is transferred in reactor, and at 150 DEG C-200 DEG C, carries out solvent-thermal process reaction fully
Rear taking-up, obtains intermediate product with deionized water and washes of absolute alcohol, and described intermediate product is by Graphene
The composite construction constituted with zinc oxide nanosphere;
4) intermediate product freeze-drying obtains zinc oxide/redox graphene aeroge.
Step 1) described in graphene oxide uniform dispersion in ethylene glycol refer to prepared oxidation
Graphene uniform is dispersed in ethylene glycol, is ultrasonically formed stable aaerosol solution, and the dispersion liquid concentration of preparation is
0.5mg/ml~1mg/ml.
Described soluble zinc salt includes any one in zinc acetate, zinc chloride or zinc nitrate, described weak base reagent bag
Including any one in sodium acetate, urea or ammoniacal liquor, described reducing agent is sodium citrate or hydrazine hydrate.
Soluble zinc salt and the mass ratio 10:1 of graphene oxide, described weak base reagent and reducing agent mass ratio
About 6:1;
The aeroge that the preparation method of described zinc oxide/redox graphene aeroge obtains, is by graphite
Jie's cavernous structure that alkene fold is formed, Graphene and zinc oxide composite construction are connected with each other stacking on three dimensions
And forming loose structure, spherical Zinc oxide nanoparticle is between graphene sheet layer.
Beneficial effect: the invention discloses a kind of method preparing zinc oxide/redox graphene aeroge.To
The sample characterization prepared eventually shows: sample achieves zinc oxide and Graphene being combined on three dimensions, this
Bright have a series of advantage: 1. reaction is temperature required relatively low, is effectively improved the security 2. technique letter of experiment
Single, use solvent-thermal method to synthesize in the solution, reaction speed is very fast, and raw material availability is high;3. pair equipment requirement
Low, it is only necessary to an isoperibol (baking oven), it is simple to industrialization large area produces, and cost is relatively low;4. repeat
Property strong, can be by the control in terms of adjusting related process parameters such as reagent dosage realizing aerogel structure.This
Zinc oxide/redox graphene the aeroge of invention preparation may be used for gas sensor, photocatalysis absorption fall
Solve the aspects such as organic pollution, solar cell and nano-device.5. intermediate product is being carried out freeze-drying
Time, the aerogel structure of generation can be with loading varying in size and producing different aerogel structure of container.
Accompanying drawing explanation
Fig. 1 is the scanning electron microscope (SEM) photograph of embodiment 1 sample surfaces;
Fig. 2 is the scanning electron microscope (SEM) photograph of embodiment 2 sample surfaces;
Fig. 3 is the scanning electron microscope (SEM) photograph of embodiment 3 sample surfaces;
Fig. 4 is the transmission electron microscope figure preparing zinc oxide/redox graphene aeroge sample, permissible by figure
Find out that Graphene pleated structure is preferably wrapped in the spherical zinc oxide nano-particle grown, and this similar
Structure large area exist, be not difficult to confirm that the zinc oxide of preparation and Graphene composite effect are fine, the present invention proposes
This method there is feasibility.
Detailed description of the invention
A kind of method preparing zinc oxide/redox graphene aeroge, prepares certain density graphite oxide
Allyl diglycol dispersion liquid, is the most once proportionally added into other reagent, uses solvent-thermal method growth postlyophilization
Zinc oxide/redox graphene aeroge sample can be obtained.Specifically comprising the following steps that of described method
(1) uniform dispersion in the ethylene glycol of preparation graphene oxide: weigh the graphene oxide of certain mass
Spent glycol soaks 1h, and in the Vltrasonic device that power is 100W, ultrasonic 4h under room temperature, obtains uniform oxygen
Functionalized graphene ethylene glycol dispersion liquid;
(2) a certain proportion of zinc acetate, sodium citrate, sodium acetate to above-mentioned dispersion liquid, and magnetic it are sequentially added into
Power stirs;
(3) above-mentioned mixed liquor is transferred in reactor, takes out after reacting 10h at 150 DEG C-200 DEG C, and
Repeatedly clean repeatedly with deionized water and absolute ethyl alcohol;
(4) it is placed in 12h in freeze drying box and i.e. can get zinc oxide/redox graphene aeroge.
The concentration of described graphene oxide dispersion preparation is 0.5mg/ml~1mg/ml.
With instantiation, technical scheme is described below, but protection scope of the present invention is not limited to this;
Embodiment 1
(1) weigh 30mg graphene oxide 60ml ethylene glycol and soak 1h, be the ultrasonic of 100W at power
Ultrasonic 4h under room temperature in device, obtains uniform graphite oxide allyl diglycol dispersion liquid;
(2) 0.544g zinc acetate, 0.2g sodium citrate, 1.2g sodium acetate to above-mentioned dispersion liquid it are sequentially added into,
And magnetic agitation is uniform;
(3) above-mentioned mixed liquor is transferred in reactor, takes out after reacting 10h at 160 DEG C, and spend
Ionized water and absolute ethyl alcohol clean repeatedly repeatedly;
(4) it is placed in 12h in freeze drying box and i.e. can get zinc oxide/redox graphene aeroge.Its surface shape
Looks are as it is shown in figure 1, it may be seen that Jie's cavernous structure significantly formed by Graphene fold, due to system
Graphene and zinc oxide composite construction for going out are connected with each other stacking on three dimensions and form loose structure, very
Being all visible on naked eyes to this structure, the most spherical Zinc oxide nanoparticle is positioned at graphene film
Between Ceng.
Embodiment 2
(1) weigh 60mg graphene oxide 60ml ethylene glycol and soak 1h, be the ultrasonic of 100W at power
Ultrasonic 4h under room temperature in device, obtains uniform graphite oxide allyl diglycol dispersion liquid;
(2) 0.544g zinc chloride, 0.2g sodium citrate, 1.2g sodium acetate to above-mentioned dispersion liquid it are sequentially added into,
And magnetic agitation is uniform;
(3) above-mentioned mixed liquor is transferred in reactor, takes out after reacting 10h at 160 DEG C, and spend
Ionized water and absolute ethyl alcohol clean repeatedly repeatedly;
(4) it is placed in 12h in freeze drying box and i.e. can get zinc oxide/redox graphene aeroge.Its table
Face pattern, as in figure 2 it is shown, in this embodiment, reduce the concentration of graphene oxide, is being observed and embodiment
While Jie's cavernous structure similar in 1, find that spherical Zinc oxide nanoparticle is more, also
It is interspersed between graphene sheet layer.
Embodiment 3
(1) weigh 60mg graphene oxide 60ml ethylene glycol and soak 1h, be the ultrasonic of 100W at power
Ultrasonic 4h under room temperature in device, obtains uniform graphite oxide allyl diglycol dispersion liquid;
(2) 1.088g zinc acetate, 0.2g sodium citrate, 1.2g sodium acetate to above-mentioned dispersion liquid it are sequentially added into,
And magnetic agitation is uniform;
(3) above-mentioned mixed liquor is transferred in reactor, takes out after reacting 10h at 160 DEG C, and spend
Ionized water and absolute ethyl alcohol clean repeatedly repeatedly;
(4) it is placed in 12h in freeze drying box and i.e. can get zinc oxide/redox graphene aeroge.Its surface shape
Looks are as it is shown on figure 3, in fact much like with embodiment 2, and meso-hole structure is it is also obvious that be possibly due to
Add Zn2+Consumption so that final ZnO nano spherical structure becomes many.
Embodiment 4
(1) weigh 60mg graphene oxide 60ml ethylene glycol and soak 1h, be the ultrasonic of 100W at power
Ultrasonic 4h under room temperature in device, obtains uniform graphite oxide allyl diglycol dispersion liquid;
(2) 0.544g zinc nitrate, 0.2g sodium citrate, 1.2g sodium acetate to above-mentioned dispersion liquid it are sequentially added into,
And magnetic agitation is uniform;
(3) above-mentioned mixed liquor is transferred in reactor, takes out after reacting 10h at 200 DEG C, and spend
Ionized water and absolute ethyl alcohol clean repeatedly repeatedly;
(4) it is placed in 12h in freeze drying box and i.e. can get zinc oxide/redox graphene aeroge.Its table
Face pattern as shown in Figure 4, in this embodiment, improves reaction temperature, but the pattern of final sample and reality
Execute in example 3 substantially similar.