CN106311248B - A kind of zinc ferrite/carbon/zinc oxide nanometer composite material and its method of preparation - Google Patents

A kind of zinc ferrite/carbon/zinc oxide nanometer composite material and its method of preparation Download PDF

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CN106311248B
CN106311248B CN201610670201.1A CN201610670201A CN106311248B CN 106311248 B CN106311248 B CN 106311248B CN 201610670201 A CN201610670201 A CN 201610670201A CN 106311248 B CN106311248 B CN 106311248B
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zno
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李正全
李丹
柏嵩
蓝剑雄
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Zhejiang Normal University CJNU
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Abstract

The invention discloses a kind of zinc ferrite/carbon/zinc oxide nanometer composite material and its method of preparation, which is a kind of zinc ferrite/carbon/zinc oxide nanometer composite material with hollow structure, chemical expression ZnFe2O4/C/ZnO;The preparation method of the material is to utilize Fe3O4@C sky ball is template, under conditions of solvent heating, obtains the ZnFe of size uniformity, morphological rules by reaction in-situ2O4/ C/ZnO composite hollow nanometer, wherein size is about 350nm, and pattern is hollow ball-shape structure.Present invention firstly provides with Fe3O4@C hollow nano-sphere is template, synthesizes the ZnFe2O4@C@ZnO compound nano-hollow sphere;Technique is advanced, and the product prepared has excellent properties;Preparation process is simple, easy to operate.

Description

A kind of zinc ferrite/carbon/zinc oxide nanometer composite material and its method of preparation
Technical field
The present invention relates to field of nano material preparation, are related to the preparation of oxidate nano hollow sphere, and especially one kind has both Magnetic, photocatalysis and glucose detection performance ZnFe2O4The preparation of/C/ZnO composite hollow nanosphere.
Background technique
ZnO has been widely used in the fields such as gas sensor, photocatalysis as a kind of important wide band gap semiconducter. However, the band gap due to ZnO is up to 3.2eV, only the ultraviolet light of short wavelength can just make it generate light induced electron in sunlight The hole and.But in sunlight, the content of ultraviolet light only accounts for 5%, and most visible light (50%) can not but excite ZnO, this Limit its extensive use.In order to solve this problem, by the ZnO of broad-band gap together with the semiconductors coupling of narrow band gap, It is a kind of raising sun light utilization efficiency, promotes its electronics to separate with hole and improve the effective way of its photocatalysis efficiency. ZnFe2O4It is a kind of semiconductor material of narrow band gap (1.9eV), can use most visible light.In addition, ZnFe2O4Also have There are good chemical stability and higher ferromagnetism.But semiconductor ZnFe2O4Under excited by visible light, light induced electron and The recombination rate in hole is very fast, and overall utilization efficiency is not high.If by ZnO and ZnFe2O4It is combined with each other to form heterojunction structure, The structure will promote the light induced electron of two kinds of semiconductors and the separation in hole simultaneously, to greatly improve photocatalysis efficiency.Closely Nian Lai, document report are some about ZnO/ZnFe2O4The synthetic method of composite material, specific as follows:
Holland's " alloy and compound magazine " (Journal of Alloys and Compounds, 2013, the 564th Volume, page 55-62) it reports under the conditions of hydro-thermal method, zinc source and source of iron, one-step synthesis ZnFe is added2O4/ ZnO composite Nano Grain.The nano particle that the method obtains does not have regular shape, and agglomeration is serious.
Switzerland's " chemical engineering journal " (Chemical Engineering Journal, 2013, volume 217, the 185th- Page 191) it reports with ZnFe2O4For template, the ZnFe with core-shell structure is synthesized2O4/ ZnO composite nanometer particle.Due to ZnFe2O4The pattern of itself is irregular and size is inhomogenous, causes the pattern of the composite nanometer particle of synthesis also irregular.
U.S.'s " physical chemistry magazine " (Journal of Physical Chemistry C, 2010, volume 114, Page 17455-17459) one kind is reported using carbon ball as template, the zinc source source of iron that molar ratio is 1:2 is added, under alkaline condition, It forms metal hydroxides and the ZnFe of hollow structure is obtained by high annealing2O4/ ZnO nano composite material.The method obtains Particle size it is larger, the specific surface area of material is small, is unfavorable for the progress of light-catalyzed reaction.In addition, removing carbon elimination template in high temperature When, easily cause the collapsing of sky spherical structure.
German " advanced material " (Advanced Materials, 2014, volume 26, page 6622-6628) is reported With metal-organic framework materials (MOFs) for presoma, by annealing process, ZnFe is synthesized2O4/ ZnO/C nanocomposite.This Kind method synthesis process is comparatively laborious, and equipment and technical conditions are more demanding.
The U.S. " ACS application material and interface " (ACS Applied Materials&Interfaces, 2015, the 7th Volume, the 17811-17818 pages) it reports using ZnO sky ball as template, source of iron is added, by high-temperature annealing process, having synthesized has The ZnFe of the double-deck sky spherical structure2O4/ ZnO composite nano materials.The size of ZnO template in the micron-scale, leads to compound receive in the method Rice grain is oversized.Particle size is excessive, reduces its specific surface area, is unfavorable for light-catalyzed reaction.
In conclusion currently in synthesis morphological rules, size uniformity, with the ZnFe of hollow structure2O4/ ZnO composite Nano Challenge is still remained on material, we have proposed a kind of low costs, easy synthesis ZnFe in the present invention2O4/ ZnO compound air The method of heart nanosphere.The ZnFe synthesized by this method2O4/ ZnO composite hollow nanosphere has morphological rules, size equal One (about 400nm) and good dispersibility.Meanwhile the particle of this method preparation, there is preferable ferromagnetism, the composition of product It is controllable with performance, photocatalytic degradation of dye and in terms of show good application prospect.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of new preparation ZnFe2O4/ C/ZnO compound nano-hollow sphere Method, to overcome disadvantages mentioned above of the existing technology.
The present invention solves its technical problem, and the following technical solution is employed:
Zinc ferrite/carbon/zinc oxide nanometer composite material provided by the invention, be a kind of zinc ferrite with hollow structure/ Carbon/zinc oxide nanometer composite material, chemical expression ZnFe2O4/C/ZnO。
Zinc ferrite/carbon/the zinc oxide nanometer composite material, having a size of 320-370nm, pattern is hollow ball-shape Structure.
Zinc ferrite provided by the invention/carbon/zinc oxide nanometer composite material preparation method, specifically: utilizing Fe3O4@C Empty ball is template, under conditions of solvent heating, obtains the ZnFe of size uniformity, morphological rules by reaction in-situ2O4/C/ZnO Composite hollow nanometer, wherein pattern is hollow ball-shape structure having a size of 320-370nm.
Above-mentioned zinc ferrite/carbon/zinc oxide nanometer composite material preparation method provided by the invention, including following step It is rapid:
A, it utilizesMethod synthesizes SiO2Particle:
(1) by ethyl alcohol, deionized water, ammonium hydroxide, 25:2:1 is mixed by volume, is quickly stirred 30min, is divided ammonium hydroxide sufficiently It dissipates in reaction system;
(2) 3mL TEOS is added rapidly in above-mentioned solution, is quickly stirred, milky occurred to solution, reduce stirring Speed continues to stir 4h, after products therefrom is centrifuged, is washed with deionized repeatedly, is finally scattered in deionized water, is made into Concentration is the solution for standby of 0.6M;
B, synthesis core shell structure SiO2@Fe3O4@C nano particle:
(1) the above-mentioned silicon ball of 2~6mL is taken, is centrifuged, it is multiple with acetone washing, it is finally scattered in 30mL acetone;
(2) 0.6g ferrocene is added in above-mentioned suspension, ultrasonic 30min, addition 3mL mass fraction is 30%H2O2, stir 30min is mixed, being sealed in liner is polytetrafluoroethylene (PTFE), and shell is in the reaction vessel of steel material, in 200 DEG C of 24~48h of reaction; After the reaction was completed, cooled to room temperature is centrifuged, and washing obtains the SiO with core-shell structure2@Fe3O4@C nano particle;
C, the Fe of synthesis bivalve layer3O4@C sky ball nano particle:
By resulting SiO2@Fe3O4@C nano particle, is scattered in the mixed solution of 10mL deionized water and 5mL ammonium hydroxide, 3min is stirred, being enclosed in liner is polytetrafluoroethylene (PTFE), and shell is to react 4 in 140 DEG C~160 DEG C in the reaction vessel of steel material ~8h;Cooled to room temperature is washed with deionized and obtains the Fe with the double-deck empty spherical structure three times3O4@C nano particle;
D, ZnFe is synthesized2O4/ C@/ZnO composite hollow nanosphere:
Using solvent-thermal method, specifically: by Fe3O4@C nano particle is scattered in the mixed solution of acetone, ethanol amine, is surpassed Sound 30min, is added a certain amount of zinc source, and the molar ratio in Fe and zinc source is (6~1): (0~1), stirs 10min, being enclosed in liner is Polytetrafluoroethylene (PTFE), shell are in the reaction vessel of steel material, in 200 DEG C of 12~36h of reaction;Again after Magneto separate and washing, Obtain ZnFe2O4/ C/ZnO composite hollow nanosphere.
In above-mentioned steps D, the acetone: ethanol amine volume ratio is 1:1.
In above-mentioned steps D, the zinc source uses one of zinc nitrate, zinc acetate, zinc chloride.
In above-mentioned steps D, the zinc source uses zinc acetate.
In above-mentioned steps D, the molar ratio in the Fe and zinc source is 3:2.
The present invention has major advantage below compared with prior art:
1. being put forward for the first time with Fe3O4@C hollow nano-sphere is template, synthesizes the ZnFe2O4@C@ZnO compound nano-hollow sphere.
2. technique is advanced, the product prepared has excellent properties.
Using Fe3O4@C hollow nano-sphere prepares composite nanometer particle as template, by reaction in-situ, after reaction It is not required to remove template, effectively avoids destruction of the high-temperature annealing process to hollow structure, the composite Nano that such method is prepared Grain structure is stablized, and its composition and performance easy-regulating.The compound nano-hollow sphere have uniform size, rule structure, Composition and performance easy-regulating and good dispersibility.In photocatalytic degradation of organic matter and the experiment of colorimetric determination glucose Show excellent performance.
3. preparation method simple process, easy to operate.
Due to using solvent structure, so easy to operate, at low cost, the requirement to equipment is low.
Detailed description of the invention
Fig. 1 is ferroferric oxide/carbon (Fe3O4@C) hollow Nano particle and zinc ferrite/carbon/zinc oxide (ZnFe2O4/C/ ZnO) the X-ray diffractogram of composite hollow nano particle, wherein@indicates cladding.The standard card of ferroso-ferric oxide is JCPDS No.19-0629;The standard card of zinc ferrite is JCPDS No.89-1011;The standard card of zinc oxide is JCPDS No.79- 0704。
Fig. 2 isThe SiO of method preparation2The transmission electron microscopy figure of nano particle.
Fig. 3 is SiO2@Fe3O4The transmission electron microscopy figure of@C nano particle.
Fig. 4 is Fe3O4The transmission electron microscopy figure of@C sky ball nano particle.
When Fig. 5 is Fe:Zn=6:1, the transmission electron microscopy figure of the sample of preparation.
When Fig. 6 is Fe:Zn=3:1, the transmission electron microscopy figure of the sample of preparation.
When Fig. 7 is Fe:Zn=3:2, the transmission electron microscopy figure of the sample of preparation.
When Fig. 8 is Fe:Zn=1:1, the transmission electron microscopy figure of the sample of preparation.
When Fig. 9 is Fe:Zn=3:2, the scanning electron microscopy of the sample of preparation.
Figure 10 is the magnetization curve of sample prepared by different Fe/Zn ratios.
Figure 11 is the sample prepared according to embodiment 3, and the activity figure of catalytic degradation methylene blue is (in figure under visible light Blue curve, i.e. c curve).In figure as a comparison be no catalyst (black curve in figure, i.e. blank), pure ZnO respectively (red curve in figure, i.e. a curve), pure ZnFe2O4(green curve in figure, i.e. b curve).
Figure 12 is under fluorescent light, sample prepared with embodiment 3 to be made to detect aqueous humor glucose, dense in different glucose Under degree, the UV-visible absorption spectrum of solution.
Specific embodiment
Below in conjunction with examples and drawings, the invention will be further described, but does not limit the present invention.
Embodiment 1:
The present invention proposes that a kind of new synthesis has zinc ferrite/carbon/zinc oxide nanometer composite material of hollow structure, changes Expression formula is ZnFe2O4/C/ZnO。
This preparation ZnFe2O4The method of/C/ZnO composite hollow nano particle, mainly comprises the steps that
1. utilizingMethod synthesizes SiO2Particle:
It (1) is by volume that 25:2:1 is mixed by the ammonium hydroxide that dehydrated alcohol, deionized water, mass fraction are 30%, quickly 30min is stirred, is well-dispersed in ammonium hydroxide in reaction system;
(2) 3mL TEOS (tetraethyl orthosilicate) is added rapidly in above-mentioned solution, is quickly stirred, occurred to solution milky white Color reduces mixing speed, continues stirring 4h and products therefrom rapid centrifugation (8000rpm, 3min) is washed with deionized more It is secondary, it is finally scattered in deionized water, is made into the silicon ball solution for standby that concentration is 0.6M.The SiO of this method synthesis2Nanometer The size of grain is in 250nm or so.
2. synthesis core shell structure SiO2@Fe3O4@C nano particle:
(1) the above-mentioned silicon ball solution of 4mL is taken, is centrifuged, it is multiple with acetone washing, finally it is scattered in 30mL acetone (analysis is pure) In, obtain suspension;
(2) 0.6g ferrocene is added in above-mentioned suspension, ultrasonic 30min, and the H that 3mL mass fraction is 30% is added2O2, stir 30min is mixed, being sealed in liner is polytetrafluoroethylene (PTFE), and shell is in the reaction vessel of steel material, for 24 hours in 200 DEG C of reactions.Reaction After the completion, cooled to room temperature is centrifuged, and washing obtains the SiO with core-shell structure2@Fe3O4@C nano particle.
3. synthesizing bivalve layer Fe3O4@C sky ball nano particle:
By above-mentioned resulting SiO2@Fe3O4@C nano particle is scattered in mixed solution (the water 10mL, ammonium hydroxide of water and ammonium hydroxide 5mL total volume 15mL) in, stir 3min, be enclosed in liner be polytetrafluoroethylene (PTFE), shell be steel material reaction vessel in, in 150 DEG C of reaction 6h.Cooled to room temperature is washed with deionized and obtains the Fe with the double-deck empty spherical structure three times3O4@C receives Rice grain.
4. synthesizing ZnFe2O4/ C/ZnO composite hollow nano particle:
By Fe3O4@C nano particle is scattered in the mixed solution (volume ratio 1:1) of acetone, ethanol amine, ultrasonic 30min, It is added Zn (AC)2As zinc source, it is that zinc source is added in 6:1 according to the molar ratio in Fe and zinc source, stirs 10min, it is poly- for being enclosed in liner Tetrafluoroethene, shell are in the reaction vessel of steel material, for 24 hours in 200 DEG C of reactions.Separation, washing.Obtain ZnFe2O4@C@ ZnO composite hollow nanosphere.
Embodiment 2:
On the basis of embodiment 1, the molar ratio in Fe and zinc source is only adjusted to 3:1, other reaction conditions are constant.
Embodiment 3:
On the basis of embodiment 1, the molar ratio in Fe and zinc source is only adjusted to 3:2, other reaction conditions are constant.
Embodiment 4:
On the basis of embodiment 1, the molar ratio in Fe and zinc source is only adjusted to 1:1, other reaction conditions are constant.
Fig. 1 shows template Fe3O4The X ray diffracting spectrum of@C sky ball nano particle and the composite nanometer particle finally synthesized, That diamond indicia mark is Fe in the figure3O4Diffraction maximum;Circular mark mark is ZnFe2O4Diffraction maximum, triangle mark What note marked is the diffraction maximum of ZnO.The curve of lower section is Fe in figure3O4The diffraction curve of@C, by comparison, it was found that, in figure line Diffraction maximum position and Fe3O4(cubic phase) standard card JCPDS No.19-0629 is consistent, illustrates that we use during the experiment Fe3O4It is pure phase, without impurity.The curve of top is ZnFe in figure2O4The diffraction curve of/C/ZnO is found by comparison, is schemed Diffraction maximum position and ZnFe in line2O4(cubic phase) standard card JCPDS No.89-1011 and ZnO (hexagonal phase) standard card JCPDS No.79-0704 is consistent, in addition to this without the appearance of other miscellaneous peaks, illustrates in final product really by ZnFe2O4 With two phase composition of ZnO, and free from admixture mutually exists.
The sample in sample and synthesis process that Fig. 2-is synthesized Fig. 8 shows best synthetic schemes is in transmission electron microscope The data obtained is characterized under (abbreviation TEM).Fig. 2 indicates to utilizeThe SiO of method synthesis2The TEM of particle characterizes picture, shows The SiO synthesized in experiment2Particle has well-regulated pattern, and uniform size and good monodispersity, size about exist 250nm or so.Fig. 3 indicates SiO2@Fe3O4The TEM of@C nano particle characterizes picture, shows Fe3O4It is coated on completely with C shell SiO2The surface of particle, in addition, particle still keeps good dispersibility.Fig. 4 indicates Fe3O4The TEM table of@C sky ball nano particle Picture is levied, as can be seen that synthesized particle has empty spherical structure, sample topography rule really from data, size uniformity divides It is good to dissipate property.Fig. 5 is the TEM characterization picture of the resulting sample of embodiment 1.Fig. 6 is the TEM characterization of the resulting sample of embodiment 2 Picture.Fig. 5, Fig. 6 and Fig. 4 it was found that, significant change does not occur for the pattern of sample, illustrate under both ratios, and There is no the generation of ZnO.Fig. 7 is the TEM characterization picture of the resulting sample of embodiment 3, as can be seen from the figure in Fe3O4@C sky ball The surface of nano particle has coated ZnO.Fig. 8 is the TEM characterization picture of the resulting sample of specific embodiment 4, can from figure Out, start a small amount of ZnO nanorod occur in the surrounding of particle, illustrate Zn2+Additional amount should control within this range.
Fig. 9 is that sample prepared by best synthesis technology characterizes the data obtained at scanning electron microscope (abbreviation SEM). It can be seen from the figure that sample has well-regulated spherical shape, and there is substance attachment on surface;In addition, passing through particle damaged in Fig. 9 As can be seen that sample really has hollow structure.
Figure 10 indicates the sample of best synthetic schemes synthesis and the magnetization curve figure of the sample in synthesis process, can from figure To find out, reaction front and back, the coercivity of sample is zero, illustrates that sample all has superparamagnetism.S1 indicates Fe in figure3O4@C is empty The magnetization curve of ball nano particle, S2 indicate the magnetization curve of the sample as prepared by embodiment 1, and S3 is indicated by 2 institute of embodiment The magnetization curve of the sample of preparation, S4 indicate the magnetization curve of the sample as prepared by embodiment 3, and S5 is indicated by 4 institute of embodiment The magnetization curve of the sample of preparation.By comparing it can be found that when Fe/Zn molar ratio increases to 3:1 (from S1-S3), sample from 6:0 The magnetism of product gradually increases, and illustrates ZnFe2O4Content is increasing;When Fe/Zn molar ratio continues growing (S4-S5), the magnetic of sample Property gradually weakens, and illustrates that the content of ZnO is increasing.
Figure 11 is prepared by the best synthesis technology of light irradiation of the visible wavelength (being obtained using filter plate) issued with 50W xenon lamp ZnFe2O4@C@ZnO sample carries out the activity curve of photocatalytic degradation to methylene blue solution, the difference in Figure 11 as a comparison It is no catalyst (the blank curve in Figure 11), pure ZnO (a curve in Figure 11), pure ZnFe2O4(the b curve in Figure 11).It is logical Cross comparison discovery, the ZnFe of best synthesis technology synthesis2O4The activity of@C@ZnO sample degradation methylene blue be higher than pure phase ZnO and Pure phase ZnFe2O4
Figure 12 is the glucose in sample detection aqueous solution prepared using best synthesis technology, not under fluorescent light With under concentration of glucose, the UV-visible absorption spectrum of solution.In figure 12 it can be seen that with the increasing of concentration of glucose Add, the absorbance of solution also becomes larger.Illustrate sample synthesized in experiment, has to the detection of aqueous humor glucose very high Activity.
By evaluation result it is found that the sample synthesized using the method for the present invention, catalytic degradation organic dyestuff under visible light, And there is good activity in terms of detection aqueous humor glucose.In four kinds of embodiments, the performance for the sample that embodiment 3 is prepared Most preferably.

Claims (8)

1. a kind of zinc ferrite/carbon/zinc oxide nanometer composite material, it is characterized in that a kind of zinc ferrite/carbon/oxygen with hollow structure Change zinc nanocomposite, chemical expression ZnFe2O4/C/ZnO;The material is to utilize Fe3O4@C sky ball is template, It under conditions of solvent heating, is obtained by reaction in-situ, wherein the molar ratio in Fe and zinc source is 3:2~1:1.
2. zinc ferrite/carbon/zinc oxide nanometer composite material according to claim 1, it is characterised in that the zinc ferrite/ Carbon/zinc oxide nanometer composite material, having a size of 350nm, pattern is hollow ball-shape structure.
3. a kind of zinc ferrite/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that utilizing Fe3O4@C sky ball is mould Plate obtains size uniformity, shape by reaction in-situ under conditions of the molar ratio in solvent heating and Fe and zinc source is 3:2~1:1 The ZnFe of looks rule2O4/ C/ZnO composite hollow nano particle, having a size of 350nm, pattern is hollow ball-shape structure.
4. zinc ferrite according to claim 3/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that including Following steps:
A, SiO is synthesized using St ber method2Particle:
(1) by ethyl alcohol, deionized water, ammonium hydroxide, 25:2:1 is mixed by volume, is quickly stirred 30 min, is well-dispersed in ammonium hydroxide In reaction system;
(2) 3 mL TEOS are added rapidly in above-mentioned solution, are quickly stirred, milky occur to solution, reduce stirring speed Degree continues to stir 4h, after products therefrom is centrifuged, is washed with deionized repeatedly, is finally scattered in deionized water, is made into dense Degree is the solution for standby of 0.6 M;
B, synthesis core shell structure SiO2@Fe3O4@C nano particle:
(1) SiO for taking 2 ~ 6 mL step A to obtain2The solution of particle, centrifugation is multiple with acetone washing, is finally scattered in 30 mL third In ketone;
(2) 0.6 g ferrocene is added in above-mentioned suspension, 30 min of ultrasound, 3 mL mass fractions of addition are 30%H2O2, stir 30 min are mixed, being sealed in liner is polytetrafluoroethylene (PTFE), and shell is to react 24 ~ 48 in 200 DEG C in the reaction vessel of steel material h;After the reaction was completed, cooled to room temperature is centrifuged, and washing obtains the SiO with core-shell structure2@Fe3O4@C nano particle;
C, the Fe of synthesis bivalve layer3O4@C sky ball nano particle:
By resulting SiO2@Fe3O4@C nano particle is scattered in the mixed solution of 10 mL deionized waters and 5 mL ammonium hydroxide, stirs Mix 3 min, be enclosed in liner be polytetrafluoroethylene (PTFE), shell be steel material reaction vessel in, in 140 DEG C ~ 160 DEG C react 4 ~ 8h;Cooled to room temperature is washed with deionized and obtains the Fe with the double-deck empty spherical structure three times3O4@C nano particle;
D, ZnFe is synthesized2O4/ C/ZnO composite hollow nanosphere:
Using solvent-thermal method, specifically: by Fe3O4@C nano particle is scattered in the mixed solution of acetone, ethanol amine, ultrasound 30 A certain amount of zinc source is added in min, and the ratio between Fe and the amount of substance in zinc source are 3:2~1:1, stirs 10 min, it is poly- for being enclosed in liner Tetrafluoroethene, shell are in the reaction vessel of steel material, in 200 DEG C of 12 ~ 36 h of reaction;Again after Magneto separate and washing, obtain To ZnFe2O4/ C/ZnO composite hollow nanosphere.
5. zinc ferrite according to claim 4/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that in step In rapid D, the acetone: ethanol amine volume ratio is 1:1.
6. zinc ferrite according to claim 4/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that in step In rapid D, the zinc source uses one of zinc nitrate, zinc acetate, zinc chloride.
7. zinc ferrite according to claim 4/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that in step In rapid D, the zinc source uses zinc acetate.
8. zinc ferrite according to claim 4/carbon/zinc oxide nanometer composite material preparation method, it is characterized in that in step In rapid D, the molar ratio in the Fe and zinc source is 3:2.
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