CN114875658B - Nanometer silicon dioxide fiber-loaded cerium dioxide and preparation method thereof - Google Patents
Nanometer silicon dioxide fiber-loaded cerium dioxide and preparation method thereof Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 149
- 239000000835 fiber Substances 0.000 title claims abstract description 93
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 63
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 title claims abstract description 39
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 229920000642 polymer Polymers 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 20
- 238000009987 spinning Methods 0.000 claims abstract description 19
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 17
- 239000002243 precursor Substances 0.000 claims abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 16
- 239000008367 deionised water Substances 0.000 claims abstract description 16
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 16
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 239000010703 silicon Substances 0.000 claims abstract description 16
- 239000011261 inert gas Substances 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 239000004310 lactic acid Substances 0.000 claims abstract description 9
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000012528 membrane Substances 0.000 abstract description 9
- 238000005245 sintering Methods 0.000 abstract description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 70
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 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 description 4
- 238000011160 research Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 231100000956 nontoxicity Toxicity 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- -1 furniture Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 206010060919 Foetal malformation Diseases 0.000 description 1
- 208000002454 Nasopharyngeal Carcinoma Diseases 0.000 description 1
- 206010061306 Nasopharyngeal cancer Diseases 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001523 electrospinning Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 208000032839 leukemia Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 201000011216 nasopharynx carcinoma Diseases 0.000 description 1
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- 238000010525 oxidative degradation reaction Methods 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/45—Oxides or hydroxides of elements of Groups 3 or 13 of the Periodic Table; Aluminates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses aThe preparation process of nanometer silica fiber supported cerium oxide includes the following steps: mixing and stirring silica sol and lactic acid to prepare a silicon source solution; stirring and dissolving a high molecular polymer in a solvent to prepare a high molecular polymer solution; mixing and stirring a silicon source solution and a high polymer solution to prepare spinning solution; preparing a silica fiber precursor by using a spinning solution through an electrostatic spinning method, and preparing a nano silica fiber membrane by sintering the silica fiber precursor; 10.8g of NaOH was dissolved in 10ml of deionized water, and 0.56g of Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, and magnetically stirring to obtain cerium oxide solution; soaking the nano silicon dioxide fiber membrane in a cerium dioxide solution, taking out the fiber, drying, putting the fiber into a tube furnace, heating under the inert gas atmosphere, preserving heat, and naturally cooling to obtain the nano silicon dioxide fiber-loaded cerium dioxide.
Description
Technical Field
The invention relates to the field of air purification materials, in particular to nano silicon dioxide fiber loaded cerium dioxide and a preparation method thereof.
Background
Modern buildings, particularly those with high energy efficiency such as office buildings, hospitals, schools, etc., often suffer from poor ventilation efficiency due to incomplete ventilation facilities, and thus present a significant safety hazard in terms of indoor air quality, which can seriously affect the physical health of occupants within such buildings. With the improvement of the living standard of people, indoor air quality is paid attention to, wherein formaldehyde is the most common and most extensive Volatile Organic Compounds (VOCs) and is particularly harmful to human health. According to the research reports of the world health organization, formaldehyde pollution can cause various diseases such as nasopharyngeal carcinoma, leukemia, irritation to respiratory mucosa, fetal malformation and the like. Indoor formaldehyde mainly comes from building materials, furniture, paint and other indoor decoration materials, and has the characteristic of long release time. It is counted that 80% of people are in the room, and the potential risks caused by long-term exposure of human bodies to formaldehyde-containing air cannot be ignored. Therefore, development of economical and environment-friendly materials capable of efficiently and rapidly purifying formaldehyde in air at room temperature has been completed.
At present, various methods and approaches exist in the aspect of treating and purifying indoor air, particularly in the aspect of removing formaldehyde in the indoor air, and more mature methods are as follows: adsorption (including physical adsorption and chemical adsorption), bioabsorption, thermocatalytic decomposition, and photocatalytic oxidative degradation. Considerable research and scientific research results show that the catalyst structure, the microstructure and polar groups such as surface hydroxyl groups on the surface of the material are main influencing factors for influencing the catalytic activity of the supported noble metal type catalyst. The catalyst can be roughly divided into metal oxides such as ZnO, al2O3, ceO2, mnO2 and partial composite oxides, nonmetallic compounds such as g-C3N4 and composite materials thereof with the metal oxides such as g-C3N4/ZnO and the like, and the catalyst can achieve the effect of efficiently purifying formaldehyde in indoor air only under specific conditions and with additional energy. Therefore, the catalyst has the advantages of low design and preparation cost, simple preparation process, no toxicity or harm, convenient recycling and environmental protection, and has great research significance.
Disclosure of Invention
Based on the above, the invention aims to provide nano-silica fiber supported cerium oxide and a preparation method thereof.
In a first aspect, the present invention provides a method for preparing nano silica fiber supported ceria, comprising:
mixing and stirring silica sol and lactic acid according to the mass ratio of 10:7 to prepare a silicon source solution; stirring and dissolving a high polymer in a solvent to prepare a high polymer solution with the mass concentration of 5% -15%; mixing and stirring a silicon source solution and a high polymer solution according to a mass concentration ratio of 2:1 to prepare spinning solution;
preparing a silica fiber precursor by using a spinning solution through an electrostatic spinning method, and preparing a nano silica fiber membrane by sintering the silica fiber precursor;
10.8g of NaOH was dissolved in 10ml of deionized water, and 0.56g of Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring to obtain cerium oxide solution;
soaking the nano silicon dioxide fiber membrane in cerium dioxide solution, taking out the fiber, drying, putting into a microwave oven for heating, putting the fiber into a tube furnace, heating under inert gas atmosphere, preserving heat, and naturally cooling to obtain the nano silicon dioxide fiber-loaded cerium dioxide.
In one implementation mode, the silica sol and the lactic acid are placed in an conical flask according to the mass ratio of 10:7 for sealing and mixing, and are stirred at the temperature of 45 ℃ in a water bath to prepare the silicon source solution.
In one embodiment of the foregoing technical solution, the silica sol is an ammonia-stabilized silica sol, and the silicon content thereof is 30%.
In one embodiment, the high molecular polymer is stirred for 2-6h at 45-85 ℃ according to the mass concentration of 5-15% and dissolved in the solvent to prepare the high molecular polymer solution with the mass concentration of 5-15%.
In one embodiment of the above technical solution, the high molecular polymer is polyvinyl alcohol, and the solvent is pure water.
In one embodiment of the foregoing technical solution, the method for preparing a silica fiber precursor by using a spinning solution through an electrostatic spinning method includes: pouring the spinning solution into a liquid tank of a needleless electrostatic spinning machine for electrostatic spinning, wherein the relevant parameters are as follows: the positive voltage is 15kv, the negative voltage is 5kv, the rotating speed of the needle is 50r/min, the distance from the receiving device to the needle is 15cm, and the rotating speed of the receiving device is 50r/min.
In one embodiment of the foregoing technical solution, the preparing a nano silica fiber film from the silica fiber precursor by sintering includes: and (3) placing the silica fiber precursor in a muffle furnace, heating to 850 ℃ at a heating rate of 2 ℃/min, preserving heat for 2 hours, heating to 1400 ℃ at a heating rate of 5 ℃/min, and preserving heat for 3 hours to obtain the nano silica fiber film.
In one embodiment, 10.8g NaOH is dissolved in 10ml deionized water to obtain 0.56g Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring at 500r/min for 20min to obtain cerium oxide solution.
In one implementation mode, the nano silicon dioxide fiber is soaked in the ceria solution for 10min, the fiber is taken out and dried in a vacuum drying oven, then the fiber is put into a microwave oven to be heated for 10min at 280 ℃, finally the fiber is put into a tube furnace to be heated to 500 ℃ under the inert gas atmosphere, the heating speed is 7 ℃/min, the temperature is kept for 2h, and then the fiber is naturally cooled to room temperature, so that the nano silicon dioxide fiber-loaded ceria is obtained;
wherein the inert gas is one of nitrogen, argon and helium.
In a second aspect, the present invention provides a nano silica fiber supported ceria prepared by the method for preparing a nano silica fiber supported ceria described in any one of the above.
The nano silicon dioxide fiber-loaded cerium oxide and the preparation method thereof have the beneficial effects that:
the nano-silica fiber prepared by the invention is loaded with cerium dioxide, a silica nano-fiber film prepared by silica sol is used as a substrate material, cerium dioxide is prepared by cerium nitrate through a hydrothermal method, and then formaldehyde removal effect is achieved by loading on the silica fiber film. The ceria-supported silica fiber prepared by the invention not only has the function of catalyzing and oxidizing formaldehyde activity at room temperature, but also has excellent room temperature fluorescent lamp irradiation enhancement activity, and has high-efficiency catalytic degradation function on formaldehyde. In addition, the nano silicon dioxide fiber loaded cerium oxide prepared by the method has low cost, simple preparation process, no toxicity, no harm and environmental friendliness, and is suitable for popularization and application.
For a better understanding and implementation, the present invention is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a graph of experimental formaldehyde removal from a nano-silica fiber loaded ceria.
FIG. 2 is a graph of formaldehyde removal experiments for conventional silica filters.
Detailed Description
Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible mentioned in this specification are defined with respect to their construction, and they are relative concepts. Therefore, the position and the use state of the device may be changed accordingly. These and other directional terms should not be construed as limiting terms.
The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of implementations consistent with aspects of the present disclosure.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
In a first aspect, the present invention provides a method for preparing nano silica fiber supported ceria, comprising:
step 101, mixing and stirring silica sol and lactic acid according to a mass ratio of 10:7 to prepare a silicon source solution; stirring and dissolving a high polymer in a solvent to prepare a high polymer solution with the mass concentration of 5% -15%; and mixing and stirring the silicon source solution and the high polymer solution according to the mass concentration ratio of 2:1 to obtain the spinning solution.
Mixing and stirring silica sol and lactic acid to obtain nano-scale dispersed silicon dioxide; the addition of the high molecular polymer enables the nano-level dispersed silicon dioxide to be combined with the chain bond of the high molecular polymer, thereby preparing the spinning solution capable of carrying out electrostatic spinning.
In the specific implementation, the silica sol and the lactic acid are placed in an conical flask according to the mass ratio of 10:7 for sealing and mixing, and are stirred at the water bath of 45 ℃ to prepare the silicon source solution.
Preferably, the silica sol is an ammonia stable silica sol having a silicon content of 30%.
In one embodiment, the high molecular polymer is dissolved in the solvent according to the mass concentration of 5% -15% under stirring at 45-85 ℃ for 2-6h, and the high molecular polymer solution with the mass concentration of 5% -15% is prepared.
Preferably, the high molecular polymer is polyvinyl alcohol, and the solvent is pure water.
Step 102, preparing a silica fiber precursor by using a spinning solution through an electrostatic spinning method, and sintering the silica fiber precursor to prepare the nano silica fiber film.
In one embodiment, the method for preparing a silica fiber precursor by electrospinning using a spinning solution comprises: pouring the spinning solution into a liquid tank of a needleless electrostatic spinning machine for electrostatic spinning, wherein the relevant parameters are as follows: the positive voltage is 15kv, the negative voltage is 5kv, the rotating speed of the needle is 50r/min, the distance from the receiving device to the needle is 15cm, and the rotating speed of the receiving device is 50r/min.
In one embodiment of the foregoing technical solution, the preparing a nano silica fiber film from the silica fiber precursor by sintering includes: and (3) placing the silica fiber precursor in a muffle furnace, heating to 850 ℃ at a heating rate of 2 ℃/min, preserving heat for 2 hours, heating to 1400 ℃ at a heating rate of 5 ℃/min, and preserving heat for 3 hours to obtain the nano silica fiber film.
Step 103, dissolving 10.8g NaOH in 10ml deionized water to obtain 0.56g Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring to obtain cerium oxide solution.
In one embodiment, 10.8g NaOH is dissolved in 10ml deionized water to obtain 0.56g Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions at 500r/minMagnetically stirring for 20min at the rotating speed to obtain the cerium oxide solution.
Step 104, soaking the nano silicon dioxide fiber membrane in cerium dioxide solution, taking out the fiber, drying, putting into a microwave oven for heating, putting the fiber into a tube furnace, heating under inert gas atmosphere, preserving heat, and naturally cooling to obtain the nano silicon dioxide fiber-loaded cerium dioxide.
In one embodiment, the nano-silica fiber is soaked in the ceria solution for 10min, the fiber is taken out and dried in a vacuum drying oven, then the fiber is put into a microwave oven to be heated at 280 ℃ for 10min, finally the fiber is put into a tube furnace to be heated to 500 ℃ under the inert gas atmosphere, the heating speed is 7 ℃/min, the temperature is kept for 2h, and then the fiber is naturally cooled to the room temperature, so that the nano-silica fiber-loaded ceria is obtained.
Wherein the inert gas is one of nitrogen, argon and helium.
In a second aspect, the invention provides a nano-silica fiber supported ceria prepared by the preparation method of the nano-silica fiber supported ceria.
Examples
Weighing 10g of silica sol, placing the silica sol into a conical flask, adding 7g of lactic acid, sealing, stirring and mixing, and stirring for 4 hours in a water bath at 45 ℃ to prepare a silicon source solution;
10g of polyvinyl alcohol (molecular weight: 20 ten thousand) was weighed, dissolved in 100g of pure water, and stirred at 90℃for 8 hours to prepare a polyvinyl alcohol solution; and heating and stirring the silicon source solution and the polyvinyl alcohol solution according to the mass ratio of 2:1 in water bath at 45 ℃ to prepare the spinning solution.
Through an electrostatic spinning method, placing the spinning solution into a liquid tank of a needleless electrostatic spinning machine for electrostatic spinning, wherein the spinning parameters are as follows: and (3) carrying out electrostatic spinning for 5 hours, wherein the positive voltage is 15kv, the negative voltage is 5kv, the spinning distance is 15cm, the rotating speed of a needle head is 30r/min, the rotating speed of a receiving plate is 50r/min, and the silica fiber precursor is prepared. And (3) placing the silica fiber precursor in a muffle furnace, heating to 850 ℃ at a heating rate of 2 ℃/min, preserving heat for 2 hours, heating to 1400 ℃ at a heating rate of 5 ℃/min, and preserving heat for 3 hours to obtain the nano silica fiber film.
10.8g of NaOH was dissolved in 10ml of deionized water, and 0.56g of Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring to obtain cerium oxide solution.
Soaking the prepared nano silicon dioxide fiber membrane in cerium dioxide solution for 10 minutes, taking out, drying in a vacuum drying oven, then placing into a microwave oven, heating at 280 ℃ for 10 minutes, finally placing the fiber into a tube furnace, heating to 500 ℃ under inert gas atmosphere at a heating speed of 7 ℃/min, preserving heat for 2 hours, and then naturally cooling to room temperature to obtain the nano silicon dioxide fiber-loaded cerium dioxide.
In a glove box, 5cm of nano silica fiber loaded ceria and a common silica filter membrane are respectively placed on a refrigerating plate, formaldehyde solution with the concentration of 1ppm is injected on a glass plate through a pipetting gun, a fan is turned on, after the air is continuously stirred for 5min to uniformly mix the released formaldehyde, the fan is turned off, an initial formaldehyde concentration value is measured, the refrigerating plate is respectively turned on, the glass culture dish is irradiated, an American Interscan portable 4160-2 formaldehyde detector is turned on, data are recorded once at intervals of 1h, and recorded data are shown in tables 1 and 2.
TABLE 1
TABLE 2
Graphs of formaldehyde concentration over time were made according to tables 1 and 2, respectively, see fig. 1 and 2, respectively.
From tables 1, 2, fig. 1 and 2 obtained in the above examples, it can be seen that the formaldehyde removal rate of the conventional silica filter membrane is only 35%, and the adsorption effect of the conventional silica filter membrane on formaldehyde is general. The formaldehyde adsorption test is carried out by using the nano-silica fiber supported ceria to obtain data, so that the formaldehyde removal rate of the nano-silica fiber supported ceria is up to 99%, which indicates that the nano-silica fiber supported ceria has a perfect formaldehyde removal effect.
The nano silicon dioxide fiber-loaded cerium oxide and the preparation method thereof have the beneficial effects that:
the nano-silica fiber prepared by the invention is loaded with cerium dioxide, a silica nano-fiber film prepared by silica sol is used as a substrate material, cerium dioxide is prepared by cerium nitrate through a hydrothermal method, and then formaldehyde removal effect is achieved by loading on the silica fiber film. The ceria-supported silica fiber prepared by the invention not only has the function of catalyzing and oxidizing formaldehyde activity at room temperature, but also has excellent room temperature fluorescent lamp irradiation enhancement activity, and has high-efficiency catalytic degradation function on formaldehyde. In addition, the nano silicon dioxide fiber loaded cerium oxide prepared by the method has low cost, simple preparation process, no toxicity, no harm and environmental friendliness, and is suitable for popularization and application.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. The preparation method of the nano silicon dioxide fiber-loaded cerium oxide is characterized by comprising the following steps:
mixing and stirring silica sol and lactic acid according to the mass ratio of 10:7 to prepare a silicon source solution; stirring and dissolving a high polymer in a solvent to prepare a high polymer solution with the mass concentration of 5% -15%; mixing and stirring a silicon source solution and a high polymer solution according to a mass concentration ratio of 2:1 to prepare spinning solution; wherein the silica sol is ammonia stable silica sol, and the silicon content is 30%;
preparing a silicon dioxide fiber precursor by using a spinning solution through an electrostatic spinning method, placing the silicon dioxide fiber precursor into a muffle furnace, heating to 850 ℃ at a heating rate of 2 ℃/min, preserving heat for 2h, heating to 1400 ℃ at a heating rate of 5 ℃/min, and preserving heat for 3h to obtain a nano silicon dioxide fiber film;
10.8g of NaOH was dissolved in 10ml of deionized water, and 0.56g of Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring to obtain cerium oxide solution;
soaking nano silicon dioxide fibers in a cerium dioxide solution for 10min, taking out the fibers, drying in a vacuum drying oven, then placing the fibers in a microwave oven for heating at 280 ℃ for 10min, finally placing the fibers in a tube furnace, heating to 500 ℃ under an inert gas atmosphere at a heating speed of 7 ℃/min, preserving heat for 2h, and naturally cooling to room temperature to obtain the nano silicon dioxide fiber-loaded cerium dioxide.
2. The method for preparing nano-silica fiber supported ceria according to claim 1, wherein: placing the silica sol and lactic acid in a conical flask according to the mass ratio of 10:7, sealing and mixing, and stirring at the temperature of 45 ℃ in a water bath to obtain a silicon source solution.
3. The method for preparing nano-silica fiber supported ceria according to claim 1, wherein: the high polymer is stirred for 2 to 6 hours at the temperature of 45 to 85 ℃ and dissolved in a solvent according to the mass concentration of 5 to 15 percent, and the high polymer solution with the mass concentration of 5 to 15 percent is prepared.
4. The method for preparing nano-silica fiber supported ceria according to claim 3, wherein: the high molecular polymer is polyvinyl alcohol, and the solvent is pure water.
5. The method for preparing nano-silica fiber supported ceria according to claim 1, wherein: the method for preparing the silica fiber precursor by using the spinning solution through the electrostatic spinning method comprises the following steps: pouring the spinning solution into a liquid tank of a needleless electrostatic spinning machine for electrostatic spinning, wherein the relevant parameters are as follows: the positive voltage is 15kv, the negative voltage is 5kv, the rotating speed of the needle is 50r/min, the distance from the receiving device to the needle is 15cm, and the rotating speed of the receiving device is 50r/min.
6. The method for preparing nano-silica fiber supported ceria according to claim 1, wherein: 10.8g of NaOH was dissolved in 10ml of deionized water, and 0.56g of Ce (NO) 3 ) 3 Dissolving in 10ml deionized water, mixing the two solutions, and magnetically stirring at 500r/min for 20min to obtain cerium oxide solution.
7. The method for preparing nano-silica fiber supported ceria according to any one of claims 1 to 6, wherein: the inert gas is one of nitrogen, argon and helium.
8. A nano silica fiber supported ceria, characterized by: is prepared by the preparation method of the nano silicon dioxide fiber supported cerium oxide according to any one of claims 1 to 7.
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| CN103603136A (en) * | 2013-11-11 | 2014-02-26 | 东华大学 | Preparation method of flexible silicon dioxide fiber film |
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| CN112299469A (en) * | 2020-09-22 | 2021-02-02 | 江汉大学 | Cerium dioxide and preparation method and application thereof |
| CN113548686A (en) * | 2021-06-04 | 2021-10-26 | 江汉大学 | Cerium dioxide nano material and preparation method and application thereof |
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| CN103603136A (en) * | 2013-11-11 | 2014-02-26 | 东华大学 | Preparation method of flexible silicon dioxide fiber film |
| CN109052451A (en) * | 2018-11-07 | 2018-12-21 | 国家纳米科学中心 | A kind of cerium dioxide nano piece and its preparation method and application |
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