CN106966422B - A kind of pair of spherical cuprous oxide microballoon and preparation method thereof - Google Patents

A kind of pair of spherical cuprous oxide microballoon and preparation method thereof Download PDF

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CN106966422B
CN106966422B CN201710211629.4A CN201710211629A CN106966422B CN 106966422 B CN106966422 B CN 106966422B CN 201710211629 A CN201710211629 A CN 201710211629A CN 106966422 B CN106966422 B CN 106966422B
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cuprous oxide
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CN106966422A (en
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任碧野
陈宇超
董任峰
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South China University of Technology SCUT
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Abstract

The invention discloses a kind of double spherical cuprous oxide microballoons and preparation method thereof.In deionized water by cupric sulfate pentahydrate dissolution of crystals, sonic oscillation prepares copper-bath to this method;Surfactant SDS, ultrasonic dissolution are added in copper-bath;Reducing agent sodium ascorbate solution is added dropwise, allows solution initial reaction 5-10 minutes;Sodium hydroxide solution is added dropwise again, the pH value for adjusting reaction system is 7.5-9, and temperature control is 15-40 DEG C, obtains primary product;Primary product is centrifuged, is washed, the clean precipitated product of bottom is obtained;Precipitated product is placed in freeze-day with constant temperature in vacuum, obtains target product.The method of the present invention is easy, efficient, raw material is easily obtained, subsequent processing condition is relatively simple, the cuprous oxide microspheres product prepared has apparent symmetric double spherical structure, compared with the cuprous oxide particle of traditional single ball-type, Cubic and octahedral build, possess more unique properties and application value.

Description

A kind of pair of spherical cuprous oxide microballoon and preparation method thereof
Technical field
The invention mainly relates to a kind of preparation methods of cuprous oxide microballoon, and in particular to one kind having apparent double spherical structures Nano balls of cuprous oxide preparation method.
Technical background
Cuprous oxide is as a kind of typical catalysis material, and with relatively narrow electronics energy gap, electronics energy gap is 2.17eV or so (mainly utilizes ultraviolet spectra) compared with traditional catalysis material-titanium dioxide, and lower electronics energy gap is determined Having determined cuprous oxide significantly more efficient can absorb the energy of solar visible light section, while can be swashed by most of visible light Hair absorbs the upper limit up to 570nm.Compared with other thin pillar materials, cuprous oxide has hypotoxicity, easily property produced etc. Advantage.Therefore, cuprous oxide has a wide range of applications in field of photocatalytic material.
The method for preparing cuprous oxide has very much, mainly have at present solution reduction, electrochemical process, photochemical syntheses method, Mechanical Method etc..Wherein, electrochemical process is the higher preparation method of business degree, it mainly has two kinds of sides of electro-deposition and anodic oxidation Method is widely used because its is easy to operate, easily controllable in states such as America and Europes;And solution reduction is that domestic application is more Method, beam are built etc. using copper acetate as raw material, and spherical and the octahedral bodily form the cuprous oxide particle is prepared using solvent-thermal method.Cui Et al. the method that is restored with glucose, CTAB prepares cuprous oxide cubic granules as surfactant.
But the cuprous oxide particle that current various methods prepare is mainly with single spherical, cube and the octahedral bodily form Main, the application for the photoelectric property that more single shape characteristic keeps its excellent is very restricted.Special symmetrical pattern energy Enough assign cuprous oxide particle this special performance of a kind of catalysis material;The micro-nano oxygen of apparent double spherical structures in the prior art The preparation method for changing cuprous microballoon is not yet seen in report.
Invention content
The purpose of the present invention is to provide a kind of micro-nano cuprous oxide microballoon with apparent double spherical structures and its preparations Method;The micro-nano cuprous oxide microballoon of double spherical structures is easy to be doped with other inorganic material, has relatively single spherical oxygen Change cuprous stronger sensibility and response.
The present invention utilizes Cu2+The nucleation of ion under alkaline condition has sensibility, by adjusting Cu in water phase2+Ion Reduction nucleating condition and corresponding last handling process, realizing has the micro-nano cuprous oxide of apparent double spherical structure special appearances micro- The preparation of ball.
The object of the invention is achieved through the following technical solutions:
A kind of preparation method of double spherical micro/nano level cuprous oxide, comprises the steps of:
(1) in deionized water by cupric sulfate pentahydrate dissolution of crystals, fully dissolving in sonic oscillation 10-15 minutes, prepares dense Degree is the copper-bath of 0.002mol/L-0.01mol/L;
(2) Surfactant SDS is added in copper-bath, it is molten that reaction raw materials liquid is carried out ultrasound Solution 10-15 minutes, is subsequently placed on magnetic stirring apparatus and stirs;Control surface activating agent lauryl sodium sulfate and copper sulphate rub You are than being 1:4.0-4.2;
(3) reducing agent sodium ascorbate solution is added dropwise in prepared reaction solution, allows solution initial reaction 5-10 minutes;
(4) sodium hydroxide solution is added dropwise again, the pH value for adjusting reaction system is 7.5-9, isothermal reaction 2-5 under magnetic agitation Hour, temperature control is 15-40 DEG C, obtains primary product;
(5) primary product is centrifuged with supercentrifuge, removes upper layer waste liquid, add deionized water oscillating washing, weight Multiple above-mentioned centrifugation water-washing process 5-10 times obtains the clean precipitated product of bottom;
(6) precipitated product is placed in freeze-day with constant temperature in vacuum, obtains target product.
To further realize the object of the invention, it is preferable that further include that oxidation stone is added after step (2) addition surfactant Then black alkene carries out ultrasonic disperse processing;0.2-0.5 grams of graphene oxide is added in every gram of cupric sulfate pentahydrate crystal;It is final to be made Adulterate double spherical micro/nano level cuprous oxide.
Preferably, it is 200-250 revs/min that magnetic agitation speed is stirred on the magnetic stirring apparatus.
Preferably, 60- is added dropwise in a concentration of 0.2mol/L of reducing agent sodium ascorbate of dropwise addition, every gram of cupric sulfate pentahydrate crystal 80 milliliters of reducing agents, at the uniform velocity drip in 1 minute.
Preferably, the pH value of step (4) reaction system is adjusted between 7.8-8.0, the concentration of sodium hydroxide solution used For 1mol/L, the isothermal reaction time is 4 hours, and temperature control is 35 DEG C.
Preferably, the rate of the supercentrifuge centrifugation is 10000 revs/min, and centrifugation every time goes residual solution in 5 minutes It removes.
Preferably, the temperature of freeze-day with constant temperature is 50-60 DEG C in the vacuum, and the dry time is 1-4 hours.It is further excellent It selects, it is 55 DEG C that the temperature of freeze-day with constant temperature, which is vacuum drying temperature, in the vacuum, 1.5 hours dry time.
Preferably, the copper-bath concentration of preparation is 0.008mol/L.
A kind of double spherical micro/nano level cuprous oxide of the present invention, is made by above-mentioned preparation method.
Compared with the existing technology, the present invention has the following advantages:
(1) present invention utilizes reducing agent sodium ascorbate and Cu2+At the sensibility of nuclear reaction in alkaline environment, phase is adjusted Cuprous oxide is directly reduced into the nano-particle with double spherical structures by the reaction condition answered in the solution, and what is prepared receives The double spherical looks of rice cuprous oxide are good.
(2) cuprous oxide (single spherical, cube shaped, octahedral bodily form that the present invention is prepared with current most methods Deng) there is notable difference, a kind of approach is provided to realize the cuprous oxide microsphere particles for preparing symmetric double spherical structure.It is this symmetrical The cuprous oxide microsphere particles of double spherical structures have the specific surface area of bigger, it is easier to be doped preparation with other inorganic material (such as graphene oxide etc.), the two spheres system surface after doping usually have more reactivity sites.These characteristics can To enhance the photoelectric characteristic of the cuprous oxide microsphere particles of this double spherical structures, promote cuprous oxide under visible light and ultraviolet light Electron transition and photohole are generated, can be applied to numerous areas, such as glucose and peroxide using these outstanding features Photocatalysis Decomposition and the detection for changing hydrogen have compared with the stronger sensibility of single spherical shape cuprous oxide and response;The light of organic dyestuff Degradation, more efficient can handle polluted-water at low cost;Detect to simple, intuitive the intensive ultraviolet in environment.Therefore this double The cuprous oxide micro-and nano-particles of spherical structure can be prepared by simple synthetic method, have important application value.
(3) present invention introduces proper amount of surfactant to keep the double ball cuprous nano particle diameters prepared uniform, More excellent photoelectric property can be generated with other materials doping.
(4) the entire preparation method of the present invention is simply controllable, does not need complicated reaction condition, post-processing step is relatively easy It realizes, the double ball cuprous oxide product properties prepared are stablized.
Description of the drawings
Fig. 1 is the electron scanning micrograph for double spherical cuprous oxide micro-and nano-particles that embodiment 1 synthesizes, times magnification 50000 times of number, figure medium scale are 200 nanometers.
Fig. 2 is the far-field scanning electron micrograph for double spherical cuprous oxide micro-and nano-particles that embodiment 1 synthesizes, and is put Big 5000 times of multiple, figure medium scale are 2 microns.
Fig. 3 is the X-ray diffractogram for double spherical cuprous oxide micro-and nano-particles that embodiment 1 synthesizes.
Fig. 4-1 is the EDX electronic images of double spherical cuprous oxide micro-and nano-particles after the doping of 3 graphene of embodiment.
Fig. 4-2 is the EDX figures of double spherical cuprous oxide micro-and nano-particles surface C u elements after the doping of 3 graphene of embodiment Picture.
Fig. 4-3 is the EDX figures of double spherical cuprous oxide micro-and nano-particles surfaces O elements after the doping of 3 graphene of embodiment Picture.
Fig. 4-4 is the EDX figures of double spherical cuprous oxide micro-and nano-particles surface C elements after the doping of 3 graphene of embodiment Picture.
Fig. 5-1 is the Tafel curve of single spherical cuprous oxide micro-and nano-particles of 3 graphene of embodiment doping.
Fig. 5-2 is the Tafel curve of double spherical cuprous oxide micro-and nano-particles of 3 graphene of embodiment doping.
Fig. 6-1 is double spherical cuprous oxide micro-and nano-particles of 3 graphene of embodiment doping under visible light illumination in water In movement locus, light intensity 43900Lux.
Fig. 6-2 be the doping of 3 graphene of embodiment double spherical cuprous oxide micro-and nano-particles under ultraviolet light in water In movement locus, light intensity be 40 × 10-3W/cm2
Specific implementation mode
To more fully understand the present invention, the present invention is further illustrated with reference to the accompanying drawings and examples, but this hair Bright embodiment is unlimited in this way, embodiment should not be understood limiting the scope of the invention.
Embodiment 1
(1) by 0.0495g cupric sulfate pentahydrates dissolution of crystals in 50mL deionized waters, sonic oscillation 10 minutes is fully molten Solution, obtains the light blue copper-bath of a concentration of 0.00396mol/L.
(2) 0.66g lauryl sodium sulfate (SDS) powder is taken to be added in prepared copper-bath, sonic oscillation is molten Solution 15 minutes, is then added magneton, is placed on magnetic stirring apparatus and stirs, and stir speed (S.S.) is 210 revs/min.
(3) be added dropwise while stirring in reaction solution 3mL solubility be 0.2mol/L reducing agent sodium ascorbate solution, 1 point It is at the uniform velocity dripped off in clock, allows solution initial reaction 5 minutes.
(4) sodium hydroxide solution of appropriate 1mol/L is added dropwise again, the pH value for adjusting reaction system is 8, permanent under magnetic agitation Temperature reaction 4 hours, temperature control are 35 DEG C.
(5) it is brick-red sediment to obtain primary product, by sediment with 10000 rpms of supercentrifuge from The heart removes upper layer waste liquid, adds deionized water oscillating washing, repeats above-mentioned centrifugation water-washing process 5 times.Bottom is finally obtained to wash Net precipitated product.
(6) precipitated product is placed in freeze-day with constant temperature in vacuum, controlled at 55 DEG C, drying time is 1.5 hours, dry It is complete to obtain double spherical cuprous oxide products.
(7) 1 milligram of double spherical cuprous oxide micro-and nano-particles being prepared and the single ball obtained in the conventional way are taken Shape cuprous oxide micro-and nano-particles, under the visible light green light irradiation that intensity of illumination is 43900Lux, respectively with a concentration of 10 × 10-3The glucose solution of mol/L and a concentration of 0.1 × 10-3The hydrogenperoxide steam generator of mol/L reacts, obtain sample for The test result of glucose and hydrogen peroxide photocatalysis performance.
Fig. 1 is the SEM shape appearance figures of the product, and amplification factor is 50000 times, and medium scale is 200 nanometers, prepared by display It is the far field SEM figures of double ball cuprous oxide particles that cuprous oxide out, which has apparent double spherical structures, Fig. 2, and amplification factor is 5000 times, figure medium scale is 2 microns, shows that the particle size of preparation has preferable homogeneity.Fig. 3 is the double of the synthesis The X-ray diffractogram of spherical cuprous oxide micro-and nano-particles compares (PDF No.050667), card with the PDF cards of cuprous oxide The micro-and nano-particles that bright this method is prepared are cuprous oxide sample.
The single spherical test result with double spherical cuprous oxide micro-and nano-particles photocatalysis performances of table 1
Table 1 is to restore Cu with traditional reducing agent (sodium ascorbate)2+Single spherical and 1 institute of the present embodiment for preparing of method Obtain reaction time of double spherical cuprous oxide micro-and nano-particles in glucose and hydrogenperoxide steam generator and microballoon mean motion speed Rate test result, wherein the glucose tested, hydrogen peroxide use are 2 milliliters, the visible light source used in test system is green light, Intensity is 43900Lux.The double spherical cuprous oxide micro-and nano-particles prepared are compared with single spherical shape, for glucose and peroxidating Hydrogen all has the shorter reaction time, and the mean motion speed of double spherical sample particles is relatively single spherical big, mainly due to The cuprous oxide microballoon of double spherical structures specific surface area with bigger under equal quality, it is micro- when by visible light exposure Electron transition occurs for ball surface, and the structure of double balls can generate more free electrons pair and the photohole of strong oxidizing property, this The photohole of a little strong oxidizing properties is distributed in cuprous oxide surface, can aoxidize the glucose in solution, and transition is freely electric It is sub then tend to promote catalytic action of the cuprous oxide to glucose or hydrogen peroxide.The specific surface area of bigger means to aoxidize It is cuprous to connect solution area and touch opportunity with test solution bigger, and acted on by the illumination of area bigger, generate largely from By electronics and photohole, the catalytic action to enhancing to glucose and hydrogen peroxide.
The cuprous oxide micro-and nano-particles of this double spherical structures of the present invention have very excellent photocatalysis performance and oxidation Degradation property (test and attached drawing for seeing below embodiment prove), can be under visible light illumination in Direct Catalytic Oxidation solution Glucose and organic dyestuff etc., and possess the characteristic of very strong anti-light corrosion, with good stability, 1 milligram is double spherical Cuprous oxide micro-and nano-particles sample can preserve two months or more in the natural environment, and traditional cuprous oxide powder due to The effect meeting rapid deterioration of photoetch, and for the visible light source and ultraviolet source and organic-fuel and glucose in environment Solution etc. has sensitive reactivity due to the huge reactivity site in surface.Such performance makes double spherical structures Microballoon can apply the glucose and hydrogen peroxide context of detection in no enzyme, have higher sensitivity and stability, and can To substantially reduce testing cost.By detecting the variation of sample particle movement velocity, preliminary estimation grape can be concisely and efficiently The content of sugar and hydrogen peroxide.
Embodiment 2
(1) by 0.0495g cupric sulfate pentahydrates dissolution of crystals in 50mL deionized waters, sonic oscillation 10 minutes is fully molten Solution, obtains the light blue copper-bath of a concentration of 0.00396mol/L.
(2) 0.66g lauryl sodium sulfate (SDS) powder is taken to be added in prepared copper-bath, sonic oscillation is molten Solution 15 minutes, is then added magneton, is placed on magnetic stirring apparatus and stirs, and stir speed (S.S.) is 210 revs/min.
(3) be added dropwise while stirring in reaction solution 3mL solubility be 0.2mol/L reducing agent sodium ascorbate solution, 1 point It is at the uniform velocity dripped off in clock, allows solution initial reaction 5 minutes.
(4) sodium hydroxide solution of appropriate 1mol/L is added dropwise again, the pH value for adjusting reaction system is 8, permanent under magnetic agitation Temperature reaction 4 hours, temperature control are 35 DEG C.
(5) it is brick-red sediment to obtain primary product, by sediment with 10000 rpms of supercentrifuge from The heart removes upper layer waste liquid, adds deionized water oscillating washing, repeats above-mentioned centrifugation water-washing process 5 times.Bottom is finally obtained to wash Net precipitated product.
(6) precipitated product is placed in freeze-day with constant temperature in vacuum, controlled at 55 DEG C, drying time is 1.5 hours.It is dry It is complete to obtain double spherical cuprous oxide products.
(7) 1 milligram of double spherical cuprous oxide micro-and nano-particles being prepared and the single ball obtained in the conventional way are taken Shape cuprous oxide micro-and nano-particles, under the visible light green light irradiation that intensity of illumination is 43900Lux, respectively with a concentration of 1 × 10-4The cresol red solution of grams per liter and a concentration of 1 × 10-4The methyl orange solution of grams per liter reacts, and obtains sample for organic dyestuff The test result of degradation property.
The single spherical test result with double spherical cuprous oxide micro-and nano-particles degradation properties of table 2
Table 2 is to restore Cu with traditional reducing agent (sodium ascorbate)2+Single spherical and 2 institute of the present embodiment for preparing of method Double spherical cuprous oxide micro-and nano-particles common are complete reaction time in machine dye solution at two kinds and microballoon is average The test result of movement rate, wherein the dosage of the cresol red solution and methyl orange solution tested is 2 milliliters, test system institute Visible light source is green light, intensity 43900Lux.And the double spherical cuprous oxide micro-and nano-particles prepared and single spherical phase Than, it is all shorter for the reaction time of both organic dyestuff, and possess faster single particle motion rate.Due to double spherical shapes Cuprous oxide micro-and nano-particles have a larger specific surface area, therefore for the relatively single spherical bigger of the contact surface of organic dyestuff, because This can greatly enhance degradation of the cuprous oxide for organic dyestuff.
Embodiment 3
(1) by 0.0495g cupric sulfate pentahydrates dissolution of crystals in 50mL deionized waters, sonic oscillation 10 minutes is fully molten Solution, obtains the light blue copper-bath of a concentration of 0.00396mol/L.
(2) 0.66g lauryl sodium sulfate (SDS) powder is taken to be added in prepared copper-bath, sonic oscillation is molten Solution 15 minutes.
(3) after above-mentioned solution fully dissolves, take 0.01g graphene oxides that reaction solution is added, sonic oscillation 1.5 hours fills Dispersion graphene oxide and reaction solution, magneton is then added in reaction solution, is placed on magnetic stirring apparatus and stirs, stir speed (S.S.) It is 250 revs/min.
(4) be added dropwise while stirring in reaction solution 3mL solubility be 0.2mol/L reducing agent sodium ascorbate solution, 1 point It is at the uniform velocity dripped off in clock, allows solution initial reaction 10 minutes.
(5) sodium hydroxide solution of appropriate 1mol/L is added dropwise again, the pH value for adjusting reaction system is 8, permanent under magnetic agitation Temperature reaction 5 hours, temperature control are 35 DEG C.
(6) it is brick-red sediment to obtain primary product, by sediment with 10000 rpms of supercentrifuge from The heart removes upper layer waste liquid, adds deionized water oscillating washing, repeats above-mentioned centrifugation water-washing process 10 times.Finally obtain bottom Clean precipitated product.
(7) precipitated product is placed in freeze-day with constant temperature in vacuum, controlled at 55 DEG C, drying time is 2 hours.After drying Obtain double spherical cuprous oxide products containing doping graphene oxide.
Fig. 4-1 is the EDX electronic images of double spherical cuprous oxide micro-and nano-particles after graphene doping, and Fig. 4-2 is stone The EDX images of double spherical cuprous oxide micro-and nano-particles surface C u elements after black alkene doping, Fig. 4-3 are after graphene adulterates The EDX images of double spherical shape cuprous oxide micro-and nano-particles surfaces O elements, Fig. 4-4 are that double spherical oxidations after graphene doping are sub- The EDX images of copper micro-and nano-particles surface C element, amplification factor are 50000 times, and figure medium scale is 1 micron.It can be apparent See that the cuprous oxide micro-and nano-particles of the double spherical structures of 3 gained of the present embodiment, can be by simple due to the feature in its structure Inorganic material is doped compound preparation, such as graphene etc. by the method for doping.The double balls containing graphene being prepared Structure cuprous oxide micro-and nano-particles from EDX it can be seen from the figure thats its with good pattern, and surface C u, O, C element point Cloth is uniform.
Fig. 5-1 is the Tafel curve of single spherical cuprous oxide micro-and nano-particles of graphene doping, and Fig. 5-2 is graphene The Tafel curve of double spherical cuprous oxide micro-and nano-particles of doping, the visible light source of irradiation is green light, and intensity is 43900Lux (wherein solid line is particle surface potential before illumination, and dotted line is particle surface potential after illumination).Graphene in Fig. 5-1 The front and back surface potential difference Δ E generated of single spherical cuprous oxide micro-and nano-particles illumination of doping is 10mV, graphene in Fig. 5-2 Double spherical front and back surface potential difference Δ E generated of cuprous oxide micro-and nano-particles illumination of doping are 25mV, it is seen that double spherical structures Cuprous oxide can be by the wider array of visible light exposure of area, so as to cause the electricity of bigger in the case of identical quality sample Potential difference.Using the variation relation of this potential difference, double spherical cuprous oxide micro-and nano-particles of graphene-containing can be used in pair In the detection and sensing of light, Fig. 6-1 be double spherical cuprous oxide micro-and nano-particles of graphene doping under visible light illumination Movement locus in water, light intensity 43900Lux.Fig. 6-2 is that double spherical cuprous oxide micro-and nano-particles of graphene doping exist Movement locus under ultraviolet light in water, light intensity are 40 × 10-3W/cm2.It is micro-nano by observing double spherical cuprous oxide The different motion conditions of particle, can detect the ultraviolet ray intensity in environment.Single spherical shape cuprous oxide micro-and nano-particles are certain Under the ultraviolet light of intensity, since photoetch acts on stronger, the variation unobvious of the universal motion conditions of particle, therefore it is right The sensitivity of stronger ultraviolet light detection is very low in environment, does not have applicable value.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all the present invention All any modification, equivalent and improvement etc., should be included in the protection of the claims in the present invention made by within spirit and principle Within the scope of.

Claims (8)

1. a kind of preparation method of double spherical micro/nano level cuprous oxide, it is characterised in that comprise the steps of:
(1) in deionized water by cupric sulfate pentahydrate dissolution of crystals, sonic oscillation 10-15 minutes fully dissolving, compound concentration is The copper-bath of 0.002mol/L-0.01mol/L;
(2) Surfactant SDS is added in copper-bath, reaction raw materials liquid is subjected to ultrasonic dissolution 10- 15 minutes;Graphene oxide is added, then carries out ultrasonic disperse processing;0.2-0.5 grams of oxygen is added in every gram of cupric sulfate pentahydrate crystal Graphite alkene;It is subsequently placed on magnetic stirring apparatus and stirs;Mole of control surface activating agent lauryl sodium sulfate and copper sulphate Than being 1:4.0-4.2;
(3) reducing agent sodium ascorbate solution is added dropwise in prepared reaction solution, allows solution initial reaction 5-10 minutes;
(4) sodium hydroxide solution is added dropwise again, adjusts the pH value of reaction system as 7.5-9, isothermal reaction 2-5 is small under magnetic agitation When, temperature control is 15-40 DEG C, obtains primary product;
(5) primary product is centrifuged with supercentrifuge, removes upper layer waste liquid, add deionized water oscillating washing, in repetition It states centrifugation water-washing process 5-10 times, obtains the clean precipitated product of bottom;
(6) precipitated product is placed in freeze-day with constant temperature in vacuum, obtains target product.
2. preparation method according to claim 1, it is characterised in that:The reducing agent sodium ascorbate of dropwise addition is a concentration of 0.2mol/L, every gram of cupric sulfate pentahydrate crystal are added dropwise 60-80 milliliters of reducing agents, are at the uniform velocity dripped in 1 minute.
3. preparation method according to claim 1, it is characterised in that:Magnetic agitation speed is stirred on the magnetic stirring apparatus It is 200-250 revs/min.
4. preparation method according to claim 1, it is characterised in that:The pH value of step (4) reaction system is adjusted to 7.8- Between 8.0, a concentration of 1mol/L of sodium hydroxide solution used, the isothermal reaction time is 4 hours, and temperature control is 35 DEG C.
5. preparation method according to claim 1, it is characterised in that:The rate of the supercentrifuge centrifugation is 10000 Rev/min, centrifugation every time removes residual solution in 5 minutes.
6. preparation method according to claim 1, it is characterised in that:The temperature of freeze-day with constant temperature is 50-60 in the vacuum DEG C, the dry time is 1-4 hours.
7. preparation method according to claim 6, it is characterised in that:The temperature of freeze-day with constant temperature is dry for vacuum in the vacuum Dry temperature is 55 DEG C, 1.5 hours dry time.
8. preparation method according to claim 1, it is characterised in that:The copper-bath concentration of preparation is 0.008mol/ L。
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