CN110639542B - In-situ hybridization room-temperature formaldehyde removal catalyst, composite gel, and preparation method and application thereof - Google Patents
In-situ hybridization room-temperature formaldehyde removal catalyst, composite gel, and preparation method and application thereof Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/0052—Preparation of gels
- B01J13/0056—Preparation of gels containing inorganic material and water
- B01J13/006—Preparation of gels containing inorganic material and water by precipitation, coagulation, hydrolyse coacervation
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- B01D2257/00—Components to be removed
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- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
Abstract
The invention discloses an in-situ hybridization room-temperature formaldehyde removal catalyst, a composite gel, and a preparation method and application thereof. The method comprises the steps of carrying out hydrothermal reaction on a manganese-containing compound, an iron-containing compound and oxalate by adopting an in-situ fixing method to obtain a room-temperature formaldehyde-removing catalyst of a hybrid element; then, the catalyst is mixed with silica gel to prepare composite gel. The room-temperature formaldehyde removal catalyst and the composite gel prepared by the method can be used for removing formaldehyde at room temperature, can perform catalytic decomposition reaction on formaldehyde, have an excellent formaldehyde removal effect, can remove low-concentration formaldehyde at room temperature, and can realize the purposes of high efficiency and long-acting property of the catalyst.
Description
Technical Field
The invention belongs to the technical field of nano materials and immobilization thereof, and particularly relates to an in-situ hybridization room-temperature formaldehyde removal catalyst, a composite gel, and a preparation method and application thereof.
Background
In many newly decorated houses, formaldehyde is constantly released from the binders for furniture, building materials, and the like. Due to the closed indoor environment, formaldehyde is continuously accumulated in the internal environment and becomes a main indoor typical pollutant. Relevant studies have shown that even with 0.5ppm formaldehyde, long term exposure to air can have adverse effects on human health. Formaldehyde is a great hazard to many health of people, and besides the carcinogenic effect, formaldehyde can also damage the immunity, the respiration, the central nervous system and the like of the human body. There are several methods for removing formaldehyde from the chamber by adsorption or chemical reaction. However, the formaldehyde release pollution is a long process, and the formaldehyde needs to be removed for a long time to ensure the safety of the indoor environment. The aim of durably removing formaldehyde is difficult to achieve only through adsorption and chemical reaction, so that the effective and durable removal of indoor formaldehyde still remains to be solved.
In order to effectively control formaldehyde, some new technologies are beginning to be applied to indoor formaldehyde removal. Among them, the catalytic oxidation method shows a great application prospect due to its long-acting characteristics. Through catalytic reaction, the catalyst can completely convert formaldehyde into harmless water and CO without changing the catalyst per se2A molecule. However, the requirement of this high efficiency catalytic method for the catalyst is high, and the catalyst is required to provide high activation energy to drive the reaction. Noble metal catalysts possess excellent catalytic activity, but their expensive price is not suitable for ordinary household use. There have been studies attempting to catalytically oxidize formaldehyde using non-noble metal catalysts, among which manganese oxides exhibit excellent catalytic performance. Currently, detailed studies on various properties of manganese oxides are being conducted, such as the influence of different morphologies, e.g., spherical, flaky, rod-like, etc., and different crystal forms, e.g., α, β, γ, δ, on the catalytic performance of manganese oxides. However, most of the manganese-based catalysts prepared by research need to perform catalytic oxidation on formaldehyde at higher temperature, and show poor catalytic oxidation capability at room temperature, which makes the practical application of formaldehyde removal in a room more difficult.
With the urgent need of the public for air purification materials, research in recent years is approaching to the actual life more and more, and the modification and modification of manganese oxide are used for improving the catalytic performance of the manganese oxide, so that the removal of formaldehyde by the manganese oxide at room temperature becomes a feasible idea. According to the thought, some layered manganese dioxide with more regular morphology is successfully prepared by adding various auxiliary reagents, and some researches modify manganese oxide by adding cerium nitrate into a reaction system. The formaldehyde removal performance of the catalysts is remarkably improved at room temperature, but in the actual use process, the maintenance of the nano-morphology and the damage of the properties of the catalysts cause the formaldehyde removal performance of the catalysts to be reduced rapidly, and the purpose of long-term use is difficult to achieve. Therefore, it is still a problem to modify the nano-materials reasonably and fix and protect the catalyst efficiently to maintain the formaldehyde removal performance of the catalyst.
Patent CN108554402A discloses a manganese dioxide composite material assembled by nano-sheets and nano-carbon, wherein the nano-secondary particles have a porous structure and can rapidly catalyze and degrade formaldehyde at room temperature. According to the invention, the manganese dioxide catalyst is loaded by adopting the nano carbon as the carrier, so that the reaction sites of the manganese dioxide can be increased, but the nano carbon does not have the characteristics of forming and fixing, and in actual use, the powdery composite material is easy to disperse in the air and is not suitable for convenient use at home.
Patent CN108554402A discloses a manganese dioxide/carbon cloth composite material and a preparation method thereof, MnO is synthesized by a hydrothermal synthesis method2The formaldehyde removal agent is loaded on carbon cloth and can be used for multiple times of catalysis, and the formaldehyde removal amount can reach 232 ppm. However, the invention needs to carry out catalytic reaction under the condition of electrification, and the adopted direct fixing method has weak fixing force, slag falling phenomenon can occur when the composite material is twisted, and the washing operation can not be carried out.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention mainly aims to provide a preparation method of an in-situ hybridization room-temperature formaldehyde removal catalyst.
The invention also aims to provide the in-situ hybridization room-temperature formaldehyde removal catalyst prepared by the method.
The invention further aims to provide application of the in-situ hybridization room-temperature formaldehyde removal catalyst in formaldehyde removal.
The invention further aims to provide the in-situ hybridization room-temperature formaldehyde-removing composite gel and the preparation method and application thereof. The composite gel is prepared from the in-situ hybridization room-temperature formaldehyde removal catalyst.
The purpose of the invention is realized by the following technical scheme:
a preparation method of an in-situ hybridization room-temperature formaldehyde removal catalyst comprises the following steps:
adding a manganese-containing compound, an iron-containing compound and oxalate into water, carrying out hydrothermal reaction at 60-120 ℃ for 4-16 h, cooling, and purifying to obtain an in-situ hybridization room-temperature formaldehyde-removing catalyst;
wherein the proportion of the manganese-containing compound, the iron-containing compound, the oxalate and the water is (0.2-5.6) kg: (0.2-5.6) kg: (1.6-5.6) kg: (20-100) L.
Preferably, the proportion of the manganese-containing compound, the iron-containing compound, the oxalate and the water is (1.5-4) kg: (1-3.5) kg: (3.4-4) kg: 100L.
Preferably, the temperature of the hydrothermal reaction is 85-110 ℃ and the time is 11-16 h.
Preferably, the manganese-containing compound is at least one of potassium permanganate and sodium permanganate.
Preferably, the iron-containing compound is at least one of potassium ferrate, ferric chloride, ferric sulfate, and ferric nitrate.
Preferably, the oxalate is at least one of sodium oxalate, potassium oxalate, ammonium oxalate and ferric oxalate.
Preferably, the purification method is: firstly, soaking a reaction product for 10-30 min by using water under a stirring condition, and removing upper-layer water after the reaction product is settled; and repeating the steps of stirring and soaking with water, settling and removing the upper water layer until the water is colorless, finishing washing, and drying the washed product to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
The drying temperature is 30-150 ℃, and the drying time is 1-20 h. And the steps of stirring and soaking with water, settling and removing the upper water layer are repeated for 3-6 times, so that the detergent can be washed clean.
The in-situ hybridization room-temperature formaldehyde removal catalyst prepared by the method.
The application of the in-situ hybridization room-temperature formaldehyde removal catalyst in formaldehyde removal.
A preparation method of in-situ hybridization room-temperature formaldehyde-removing composite gel comprises the following steps:
adding the in-situ hybridization room-temperature formaldehyde-removing catalyst into water to form uniform colloidal solution, adding silica gel, uniformly stirring, and drying to obtain the in-situ hybridization room-temperature formaldehyde-removing composite gel.
Preferably, the mass ratio of the in-situ hybridization room-temperature formaldehyde removal catalyst to water to silica gel is 1: (0.5-3): (1-4); more preferably 1: 1.5: (1-4).
Preferably, the pore diameter of the silica gel is 15-250 meshes, and preferably 100-200 meshes.
Preferably, the in-situ hybridization room-temperature formaldehyde removal catalyst forms a uniform colloidal solution by means of ultrasonic treatment, and the ultrasonic treatment time is 5-30 min.
Preferably, the time for stirring uniformly is 10-360 min.
Preferably, the drying temperature is 30-150 ℃, and the drying time is 1-20 h.
More preferably, the drying temperature is 100-150 ℃, and the drying time is 4-20 h.
The in-situ hybridization room-temperature formaldehyde-removing composite gel prepared by the method.
The application of the in-situ hybridization room-temperature formaldehyde-removing composite gel in the removal of formaldehyde.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the catalyst is prepared by adopting an in-situ fixing method, efficiently loads hybrid elements, forms a porous and loose spatial structure and a large specific surface area, can quickly enrich formaldehyde gas on the surface of the catalyst for catalytic decomposition, simultaneously increases the stability of the micro morphology of the formaldehyde gas, and improves the catalytic performance of decomposing formaldehyde at room temperature.
(2) The invention adopts multi-element hybridization modification, increases vacancy of materials, forms high electron transfer efficiency, improves formaldehyde degradation performance of the catalyst, reduces activation energy of catalytic reaction, and can rapidly degrade formaldehyde at room temperature.
(3) The invention adopts two modes of in-situ fixation and aerosol fixation, completely maintains the catalytic activity of the catalyst, provides more contact positions of the catalyst and air by the high dispersion effect of the gel, and further improves the catalytic degradation performance.
(4) The composite gel provided by the invention has excellent waterproof and dustproof capabilities, can be directly washed by water without damage, can always maintain the catalytic capability, solves the problem that the catalyst cannot be washed and recycled in practical application, and has the characteristic of cleanability and reusability, so that the purposes of high efficiency and long-term effectiveness of the catalyst are realized.
(5) The catalyst of the invention can catalyze and decompose formaldehyde, so that the formaldehyde is converted into carbon dioxide and water vapor which are harmless to the environment, and secondary pollution is not caused, thereby achieving the effect of continuously and thoroughly removing the formaldehyde.
Drawings
FIG. 1 is a scanning electron micrograph of the in situ hybridization room temperature formaldehyde-removing catalyst in example 1, which is magnified 100000 times.
FIG. 2 is a scanning electron micrograph of the in situ hybridization room temperature formaldehyde-removing catalyst in example 2, which is magnified 100000 times.
FIG. 3 is a scanning electron micrograph of the in situ hybridization room temperature formaldehyde-removing catalyst in example 3, which is magnified 100000 times.
FIG. 4 is a scanning electron micrograph of the in situ hybridization room temperature formaldehyde-removing catalyst in example 4, which is magnified 100000 times.
FIG. 5 is a scanning electron micrograph of the in situ hybridization room temperature formaldehyde-removing catalyst in example 5, which is magnified 100000 times.
FIG. 6 is a diagram showing the catalytic degradation of formaldehyde by the in situ hybridization room temperature formaldehyde removal catalyst in example 1.
FIG. 7 is a diagram showing the catalytic degradation of formaldehyde by the in situ hybridization room temperature formaldehyde removal catalyst in example 2.
FIG. 8 is a diagram showing the catalytic degradation of formaldehyde by the in situ hybridization room temperature formaldehyde removal catalyst in example 3.
FIG. 9 is a diagram showing the catalytic degradation of formaldehyde by the in situ hybridization room temperature formaldehyde removal catalyst in example 4.
FIG. 10 is a diagram showing the catalytic degradation of formaldehyde by the in situ hybridization room temperature formaldehyde removal catalyst in example 5.
FIG. 11 is a graph of the catalytic degradation of formaldehyde by in situ hybridization room temperature formaldehyde removal composite gel in example 6.
FIG. 12 is a graph showing the catalytic degradation of formaldehyde by in situ hybridization room temperature formaldehyde-removing composite gel in example 7.
FIG. 13 is a diagram showing the catalytic degradation of formaldehyde by in situ hybridization room temperature formaldehyde-removing composite gel in example 8.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
The silica gel of the embodiment of the application has a pore size of 100-200 meshes (purchased from Aladdin, product number S141265).
Example 1
0.5kg of potassium permanganate, 4.5kg of ferric chloride and 4.2kg of ammonium oxalate are weighed into a reaction kettle, 100L of distilled water is added into the reaction kettle, and the mixture is stirred and mixed until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 120 ℃ for 12 hours, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 10min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 80 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Example 2
1.5kg of sodium permanganate, 3.5kg of ferric sulfate and 4.0kg of sodium oxalate are weighed into a reaction kettle, 100L of distilled water is added into the reaction kettle, and the mixture is stirred and mixed until the mixture is uniformly mixed. Carrying out hydrothermal stirring reaction at 110 ℃ for 16h, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 10min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 100 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde removal catalyst.
Example 3
Weighing 2.5kg of potassium permanganate, 2.5kg of ferric chloride and 3.8kg of potassium oxalate in a reaction kettle, adding 100L of distilled water in the reaction kettle, and stirring and mixing until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 120 ℃ for 12 hours, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 30min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 80 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Example 4
Weighing 4kg of potassium permanganate, 1kg of ferric sulfate and 3.4kg of sodium oxalate in a reaction kettle, adding 100L of distilled water in the reaction kettle, and stirring and mixing until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 85 ℃ for 11h, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 20min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 70 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Example 5
Weighing 4kg of potassium permanganate, 1kg of potassium ferrate, 2.4kg of sodium oxalate and 1.4kg of ammonium oxalate in a reaction kettle, adding 100L of distilled water in the reaction kettle, and stirring and mixing until the mixture is uniformly mixed. Carrying out hydrothermal stirring reaction at 110 ℃ for 16h, and naturally cooling to room temperature after the reaction is finished. Soaking the modified material in deionized water, stirring for 30min, and pouring out the upper water layer after the material is slowly settled. And (3) drying the material in an oven at 60 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde removal catalyst.
Example 6
1.5kg of potassium permanganate, 1kg of sodium permanganate, 1kg of potassium ferrate, 1.5kg of ferric chloride, 2.4kg of sodium oxalate and 1.4kg of ammonium oxalate are weighed into a reaction kettle, 100L of distilled water is added into the reaction kettle, and the mixture is stirred and mixed until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 85 ℃ for 12 hours, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 10min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 70 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Mixing the in-situ hybridization room-temperature formaldehyde removal catalyst with water according to the mass ratio of 1:1, and carrying out ultrasonic treatment for 30min until the catalyst forms a uniform colloidal solution in an aqueous solution. And adding the in-situ hybridization room-temperature formaldehyde removal catalyst into the colloidal solution according to the mass ratio of 1: 2, stirring for 30min, fully dispersing, coating on non-woven fabric, and putting into an oven for drying at 100 ℃ for 10h to obtain the in-situ hybridization room-temperature formaldehyde-removing composite gel.
Example 7
Weighing 2.5kg of potassium permanganate, 2.5kg of ferric chloride and 3.8kg of ammonium oxalate in a reaction kettle, adding 100L of distilled water in the reaction kettle, and stirring and mixing until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 85 ℃ for 12 hours, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 10min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 70 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Mixing the in-situ hybridization room-temperature formaldehyde removal catalyst with water according to the mass ratio of 1:1.5, and carrying out ultrasonic treatment for 30min until the catalytic material forms a uniform colloidal solution in the aqueous solution. And adding the in-situ hybridization room-temperature formaldehyde removal catalyst into the colloidal solution according to the mass ratio of 1:1, stirring for 30min, fully dispersing, coating on non-woven fabric, and putting into an oven for drying at 100 ℃ for 10h to obtain the in-situ hybridization room-temperature formaldehyde-removing composite gel.
Example 8
Weighing 2.5kg of potassium permanganate, 2.5kg of ferric chloride and 3.8kg of ammonium oxalate in a reaction kettle, adding 100L of distilled water in the reaction kettle, and stirring and mixing until the mixture is uniformly mixed. And carrying out hydrothermal stirring reaction at 85 ℃ for 12 hours, and naturally cooling to room temperature after the reaction is finished. Soaking the reacted modified material in deionized water and stirring for 10min, after the material is slowly settled, pouring the water on the upper layer, and repeating the operation for 3 times until the water after cleaning has no color. And (3) drying the cleaned material in an oven at 70 ℃ for 12h to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst.
Mixing the in-situ hybridization room-temperature formaldehyde removal catalyst with water according to the mass ratio of 1:1.5, and carrying out ultrasonic treatment for 30min until the catalyst forms a uniform colloidal solution in the aqueous solution. And adding a catalyst which is hybridized in situ and removes formaldehyde at room temperature into the solution in a mass ratio of 1: 4, stirring the silica gel for 30min, fully dispersing, coating the silica gel on non-woven fabric, and putting the non-woven fabric into an oven to be dried for 10h at 100 ℃ to obtain the in-situ hybridization room-temperature formaldehyde-removing composite gel.
The in-situ hybridization room-temperature formaldehyde-removing composite gel prepared in the example 8 is washed with water for 10 times, the in-situ hybridization room-temperature formaldehyde-removing composite gel is not damaged, and the structure is kept complete.
Under the condition of normal temperature of 25 ℃, the in-situ hybridization room-temperature formaldehyde removal catalyst prepared in the examples 1 to 5 and the in-situ hybridization room-temperature formaldehyde removal composite gel prepared in the examples 6 to 8 are applied to degrading low-concentration indoor formaldehyde gas, wherein the initial formaldehyde concentration is about 1ppm, the addition amount of the catalyst is 0.3g, and the box capacity is 26L. Sampling is carried out once every a period of time, and the concentration of the formaldehyde gas is detected. As can be seen from the figure, the composite catalytic material provided by the invention can treat low-concentration indoor formaldehyde gas at normal temperature. The composite gel catalyst provided by the invention has an excellent catalytic effect at normal temperature. The results of the formaldehyde degradation detection by the catalysts or composite gels obtained in examples 1-8 are shown in FIGS. 6-13. The composite gel has excellent catalytic performance, and the formaldehyde removal rate reaches over 90 percent. After 10 times of water washing, the composite gel prepared in the example 8 still has excellent catalytic performance, and the catalytic capacity is reduced to be within 5%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The preparation method of the in-situ hybridization room-temperature formaldehyde-removing composite gel is characterized by comprising the following steps of: adding a manganese-containing compound, an iron-containing compound and oxalate into water, carrying out hydrothermal reaction at 60-120 ℃ for 4-16 h, cooling, and purifying to obtain an in-situ hybridization room-temperature formaldehyde-removing catalyst;
wherein the proportion of the manganese-containing compound, the iron-containing compound, the oxalate and the water is (0.2-5.6) kg: (0.2-5.6) kg: (1.6-5.6) kg: (20-100) L;
adding the in-situ hybridization room-temperature formaldehyde-removing catalyst into water to form uniform colloidal solution, adding silica gel, uniformly stirring, and drying to obtain the in-situ hybridization room-temperature formaldehyde-removing composite gel.
2. The preparation method of the in-situ hybridization room-temperature formaldehyde-removing composite gel according to claim 1, wherein the mass ratio of the in-situ hybridization room-temperature formaldehyde-removing catalyst to water to silica gel is 1: (0.5-3): (1-4); the aperture of the silica gel is 15-250 meshes.
3. The preparation method of the in-situ hybridization room-temperature formaldehyde-removing composite gel according to claim 2, wherein the in-situ hybridization room-temperature formaldehyde-removing catalyst forms a uniform colloidal solution by means of ultrasonic treatment, and the ultrasonic treatment time is 5-30 min; the time for uniformly stirring is 10-360 min; the drying temperature is 30-150 ℃, and the drying time is 1-20 h.
4. The preparation method of the in-situ hybridization room-temperature formaldehyde-removing composite gel according to claim 1, wherein the manganese-containing compound is at least one of potassium permanganate and sodium permanganate; the iron-containing compound is at least one of potassium ferrate, ferric chloride, ferric sulfate and ferric nitrate; the oxalate is at least one of sodium oxalate, potassium oxalate, ammonium oxalate and ferric oxalate.
5. The preparation method of the in-situ hybridization room-temperature formaldehyde-removing composite gel according to claim 4, wherein the purification method comprises the following steps: firstly, soaking a reaction product for 10-30 min by using water under a stirring condition, and removing upper-layer water after the reaction product is settled; repeating the steps of stirring and soaking with water, settling and removing the upper water layer until no color exists in the water, finishing washing, and drying the washed product to obtain the in-situ hybridization room-temperature formaldehyde-removing catalyst;
the drying temperature is 30-150 ℃, and the drying time is 1-20 h.
6. An in-situ hybridization room temperature formaldehyde-removing composite gel prepared by the method of any one of claims 1 to 5.
7. The use of the in-situ hybridization room temperature formaldehyde-removing composite gel of claim 6 for removing formaldehyde.
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