CN112374524A - Preparation method of cerium dioxide nano powder based on dry tremella - Google Patents
Preparation method of cerium dioxide nano powder based on dry tremella Download PDFInfo
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- CN112374524A CN112374524A CN202011414255.4A CN202011414255A CN112374524A CN 112374524 A CN112374524 A CN 112374524A CN 202011414255 A CN202011414255 A CN 202011414255A CN 112374524 A CN112374524 A CN 112374524A
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- 241001506047 Tremella Species 0.000 title claims abstract description 59
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 title claims abstract description 40
- 239000011858 nanopowder Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052709 silver Inorganic materials 0.000 claims abstract description 26
- 239000004332 silver Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 25
- 150000000703 Cerium Chemical class 0.000 claims abstract description 23
- 238000001354 calcination Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000004108 freeze drying Methods 0.000 claims abstract description 12
- 239000012266 salt solution Substances 0.000 claims abstract description 12
- 238000005303 weighing Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000000643 oven drying Methods 0.000 claims abstract description 7
- 230000008961 swelling Effects 0.000 claims abstract description 7
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 20
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 claims description 12
- OZECDDHOAMNMQI-UHFFFAOYSA-H cerium(3+);trisulfate Chemical compound [Ce+3].[Ce+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O OZECDDHOAMNMQI-UHFFFAOYSA-H 0.000 claims description 12
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 29
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 9
- 229910002651 NO3 Inorganic materials 0.000 description 9
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 9
- 229910000420 cerium oxide Inorganic materials 0.000 description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 241000908178 Tremella fuciformis Species 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 159000000021 acetate salts Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- HKVFISRIUUGTIB-UHFFFAOYSA-O azanium;cerium;nitrate Chemical compound [NH4+].[Ce].[O-][N+]([O-])=O HKVFISRIUUGTIB-UHFFFAOYSA-O 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000001072 colon Anatomy 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000003278 egg shell Anatomy 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- YPJKMVATUPSWOH-UHFFFAOYSA-N nitrooxidanyl Chemical compound [O][N+]([O-])=O YPJKMVATUPSWOH-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Cosmetics (AREA)
Abstract
The invention discloses a preparation method of cerium dioxide nano powder based on dry tremella, which comprises the following steps: dissolving cerium salt in water to prepare a cerium salt solution; weighing dry silver lugs, and adding the dry silver lugs into a cerium salt solution for swelling; and (3) washing the swelled tremella pieces, drying in an oven or freeze drying, and calcining in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella. The method is simple, controllable, low in cost and suitable for industrial production, and can effectively improve the additional value of the cerium dioxide.
Description
Technical Field
The invention belongs to the technical field of rare earth material application, and particularly relates to a preparation method of cerium dioxide nano powder based on dry tremella.
Background
In rare earth, the price of cerium is low, the 99.9 percent of cerium oxide in 2020 is only about 13 yuan/kg, the price of nano cerium oxide is generally 100 yuan/kg or more, and the nano cerium oxide is beneficial to improving the added value of the cerium oxide. The existing method for preparing nano powder comprises the following steps: 1. gas phase method: the common methods include inert gas condensation, sputtering, vacuum vapor deposition on a flowing liquid surface, energization heating, wire explosion, chemical vapor reaction, and the like. 2. Liquid phase method: precipitation methods, hydrolysis methods, hydrothermal methods, spraying methods, sol-gels, and the like are common. 3. Solid phase method: the thermal decomposition method, the solid phase reaction method, the spark discharge method, the dissolution method, the ball milling method, etc. are commonly used.
The preparation method of the nano cerium dioxide mainly comprises a precipitation method, a hydrothermal method and a sol-gel method. Wherein, the technological conditions (dripping speed and reaction temperature) for preparing the nano cerium dioxide by the precipitation method are difficult to control, the reaction time is long, and the particle size distribution of the prepared powder is wide; the hydrothermal method for preparing the nano cerium dioxide has long reaction time and complex process; the sol-gel method for preparing the nano cerium dioxide has long reaction time, complex process and large particle size of the prepared powder.
The prior literature reports that the template agent is obtained by treating petals, eggshell inner membrane and the like with acid and alkali or by calcining starch and glucose at high temperature. Precipitating a cerium source in a template agent in a solution, drying and calcining to obtain the nano cerium dioxide. The methods obtain the template agent through pretreatment, and simultaneously need to add a precipitator, and then obtain the nano cerium dioxide through drying and calcining.
Therefore, there is a need for a novel method for preparing cerium dioxide nanopowder.
Disclosure of Invention
In view of the above, the invention provides a preparation method of cerium dioxide nano powder based on dry tremella aiming at the problems of complex process, long time consumption and high production cost.
In order to solve the technical problem, the invention discloses a preparation method of cerium dioxide nano powder based on dry tremella, which comprises the following steps:
step 1, preparing a cerium salt solution: dissolving cerium salt in water to prepare a cerium salt solution;
step 2, weighing dry silver lugs, and adding the dry silver lugs into a cerium salt solution for swelling; and (3) washing the swelled tremella pieces, drying in an oven or freeze drying, and calcining in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella.
Optionally, the cerium salt in step 1 is one of cerium nitrate, cerium sulfate or cerium acetate.
Optionally, the dissolution temperature in step 1 is 50 ℃ to 80 ℃.
Optionally, the mass ratio of the cerium salt to the water in the step 1 is 1:1-1: 10.
Optionally, the dry tremella pieces in the step 2 account for 5-50% of the total mass of the cerium salt.
Optionally, the swelling rotation speed in the step 2 is 50-150r/min, and the swelling time is 0.5-1.5 h.
Optionally, the oven drying time in the step 2 is 1.5-2.5 h, and the oven drying temperature is 75-85 ℃.
Optionally, the freeze-drying time in the step 2 is 1.5-2.5 h, and the freeze-drying temperature is-25 ℃ to-40 ℃.
Alternatively, the calcination temperature in step 2 is 550 ℃ to 1050 ℃.
Compared with the prior art, the invention can obtain the following technical effects:
1) the nano cerium dioxide prepared by the invention can be widely applied to photocatalytic materials, cerium dioxide polishing powder materials, glass industrial additives, cosmetic ultraviolet absorbers and the like.
2) The method is simple, controllable, low in cost and suitable for industrial production, and can effectively improve the additional value of the cerium dioxide.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an XRD diffraction pattern of dried tremella-based cerium dioxide nanopowder prepared in example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of dried tremella-based cerium dioxide nanopowder prepared in example 1 of the present invention;
fig. 3 is a diffuse reflection spectrum of the cerium dioxide nano powder based on dry tremella prepared in example 1 of the present invention.
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, so that how to implement the technical features of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.
The invention discloses a preparation method of cerium dioxide nano powder based on dry tremella, which comprises the following steps:
step 1, preparing a cerium salt solution: dissolving cerium salt in water at the temperature of 50-80 ℃ according to the mass ratio of 1:1-10 to prepare a cerium salt solution; wherein, the cerium salt is one of cerium nitrate, ammonium ceric nitrate, cerium sulfate or cerium acetate;
wherein, nitrate salt, sulfate salt and acetate salt can be decomposed at high temperature to generate oxide, if the oxide is directly decomposed at high temperature, the particle size of the generated oxide is extremely large and often reaches micron level, and the nano effect of materials is avoided. When preparing the nano oxide material, the nano oxide is generally sintered by utilizing the morphology inheritance of the precipitate which is generated in advance, such as nano hydroxide, nano oxalate, nano carbonate and the like, and is sintered at high temperature. According to the method, a precipitator is not added, the tremella fuciformis slices are used as templates, and the solution of cerium nitrate, cerium sulfate, cerium acetate and ammonium cerium nitrate is directly calcined to prepare the nano cerium oxide.
Step 2, weighing dry silver lugs, wherein the dry silver lugs account for 5-50% of the mass of the cerium salt solution, and adding the dry tremella lugs into the cerium salt solution at a rotating speed of 50-150r/min to swell for 0.5-1.5 h; and (3) after the swelled tremella pieces are washed, drying the tremella pieces in an oven at the temperature of 75-85 ℃ for 1.5-2.5 h or freeze-drying the tremella pieces at the temperature of-25 ℃ to-40 ℃ for 1.5-2.5 h, and calcining the tremella pieces in a muffle furnace at the temperature of 550-1050 ℃ to prepare the cerium dioxide nano powder based on the dry tremella.
Wherein, the calcining temperature is lower than 550 ℃ and can not decompose nitrate radical, sulfate radical and acetate radical, the sintering temperature is too high and exceeds 1050 ℃, the size of the produced powder is enlarged, and simultaneously, the energy consumption is too high.
The ratio of the solution to the silver lug is too high, the tremella fuciformis can not completely absorb the solution, the ratio of the solution to the silver lug is too low, and the tremella fuciformis is wasted greatly.
Example 1
Dissolving cerium nitrate in water according to the mass ratio of 1:5 at the temperature of 65 ℃ to prepare a cerium nitrate solution; weighing dry silver lugs, wherein the dry silver lugs account for 30% of the total mass of the cerous nitrate solution, and adding the dry tremella pieces into the cerous nitrate solution at the rotating speed of 100 r/min to swell for 2 hours; and (3) washing the swelled tremella pieces, drying the tremella pieces in an oven at 80 ℃ for 2h, and calcining the tremella pieces in a muffle furnace at 800 ℃ to obtain the cerium dioxide nano powder based on the dried tremella.
Example 2
Dissolving ammonium ceric nitrate in water at the temperature of 50 ℃ according to the mass ratio of 1:10 to prepare ammonium ceric nitrate solution; weighing dry silver lugs, wherein the dry silver lugs account for 5% of the mass of the ammonium ceric nitrate solution, and adding the dry tremella pieces into the ammonium ceric nitrate solution at the rotating speed of 150r/min to swell for 0.5 h; and (3) washing the swelled tremella pieces, drying the tremella pieces in an oven at 85 ℃ for 1.5h, and calcining the tremella pieces in a muffle furnace at 1050 ℃ to obtain the cerium dioxide nano powder based on the dried tremella.
Example 3
Dissolving cerium sulfate in water according to the mass ratio of 1:1 at the temperature of 80 ℃ to prepare a cerium sulfate solution; weighing dry silver lugs, wherein the dry silver lugs account for 50% of the total mass of the cerium sulfate solution, and adding the dry tremella pieces into the cerium sulfate solution at a rotating speed of 50r/min to swell for 1.5 h; and (3) washing the swelled tremella pieces, drying the tremella pieces in a 75 ℃ oven for 2.5 h, and calcining the tremella pieces in a muffle furnace at 550 ℃ to obtain the cerium dioxide nano powder based on the dried tremella.
Example 4
Dissolving cerium acetate in water according to the mass ratio of 1:3 at the temperature of 60 ℃ to prepare a cerium acetate solution; weighing dry silver lugs, wherein the dry silver lugs account for 10% of the total mass of the cerium acetate solution, and adding the dry tremella pieces into the cerium acetate solution at a rotating speed of 120 r/min to swell for 0.8 h; and (3) washing the swelled tremella pieces, drying the tremella pieces in an oven at 78 ℃ for 2.2 h, and calcining the tremella pieces in a muffle furnace at 750 ℃ to obtain the cerium dioxide nano powder based on the dried tremella.
Example 5
Dissolving cerium nitrate in water according to the mass ratio of 1:8 at the temperature of 70 ℃ to prepare a cerium nitrate solution; weighing dry silver lugs, wherein the dry silver lugs account for 40% of the total mass of the cerous nitrate solution, and adding the dry tremella pieces into the cerous nitrate solution at a rotating speed of 80 r/min to swell for 1.2 h; and (3) washing the swelled tremella pieces, then carrying out freeze drying for 2h at the temperature of-30 ℃, and calcining at the temperature of 850 ℃ in a muffle furnace to prepare the cerium dioxide nano powder based on the dried tremella.
Example 6
Dissolving ammonium ceric nitrate in water according to the mass ratio of 1:6 at the temperature of 55 ℃ to prepare ammonium ceric nitrate solution; weighing dry silver lugs, wherein the dry silver lugs account for 30% of the total mass of the ammonium ceric nitrate solution, and adding the dry tremella pieces into the ammonium ceric nitrate solution at the rotating speed of 90 r/min to swell for 1.5 h; and (3) washing the swelled tremella pieces, freeze-drying at-25 ℃ for 1.5h, and calcining at 550 ℃ in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella.
Example 7
Dissolving cerium sulfate in water according to the mass ratio of 1:4 at the temperature of 75 ℃ to prepare a cerium sulfate solution; weighing dry silver lugs, wherein the dry silver lugs account for 35% of the total mass of the cerium sulfate solution, and adding the dry tremella pieces into the cerium sulfate solution at a rotating speed of 80 r/min to swell for 1.1 h; and (3) washing the swelled tremella pieces, then carrying out freeze drying at-40 ℃ for 2.5 h, and calcining at 950 ℃ in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella.
Example 8
Dissolving cerium acetate in water according to the mass ratio of 1:5 at the temperature of 65 ℃ to prepare a cerium acetate solution; weighing dry silver lugs, wherein the dry silver lugs account for 25% of the total mass of the cerium acetate solution, and adding the dry tremella pieces into the cerium acetate solution at a rotating speed of 100 r/min to swell for 1 h; and (3) washing the swelled tremella pieces, then carrying out freeze drying at-35 ℃ for 2h, and calcining at 1050 ℃ in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella.
As can be seen from FIG. 1, the XRD diffraction pattern of the dried tremella-based cerium dioxide nano-powder prepared in example 1 is compared with the standard cerium dioxide PDF card #81-0792, so that the product after calcination has no impurities, cerium oxide is generated, and the product has high crystallinity. As can be seen from fig. 2, the scanning electron microscope image of the dried tremella-based ceria nano-powder prepared in example 1 shows that the prepared ceria has good dispersibility, the particle size of the product is less than 100 nm, and a large amount of nano-powder is aggregated together to form the porous material. As can be seen from FIG. 3, when the cerium dioxide prepared by Colon is used as a reference, the diffuse reflection spectrum of the nano cerium dioxide prepared in example 1 at the wavelength of 200-800 nm is determined, and the ultraviolet absorption of the sample is obviously improved.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A preparation method of cerium dioxide nano powder based on dry tremella is characterized by comprising the following steps:
step 1, preparing a cerium salt solution: dissolving cerium salt in water to prepare a cerium salt solution;
step 2, weighing dry silver lugs, and adding the dry silver lugs into a cerium salt solution for swelling; and (3) washing the swelled tremella pieces, drying in an oven or freeze drying, and calcining in a muffle furnace to obtain the cerium dioxide nano powder based on the dried tremella.
2. The method according to claim 1, wherein the cerium salt in step 1 is one of cerium nitrate, cerium sulfate or cerium acetate.
3. The method according to claim 1, wherein the dissolution temperature in the step 1 is 50 ℃ to 80 ℃.
4. The method according to claim 1, wherein the cerium salt and water in step 1 are in a mass ratio of 1:1 to 1: 10.
5. The preparation method according to claim 1, wherein the dry tremella pieces in the step 2 account for 5-50% of the cerium salt by mass.
6. The preparation method according to claim 1, wherein the swelling speed in step 2 is 50-150r/min, and the swelling time is 0.5-1.5 h.
7. The preparation method according to claim 1, wherein the oven drying time in the step 2 is 1.5-2.5 h, and the oven drying temperature is 75-85 ℃.
8. The method according to claim 1, wherein the freeze-drying time in step 2 is 1.5 to 2.5 hours, and the freeze-drying temperature is-25 ℃ to-40 ℃.
9. The method according to claim 1, wherein the calcination temperature in the step 2 is 550 ℃ to 1050 ℃.
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