Attapulgite composite air purifying agent and preparation method thereof

Abstract

The invention belongs to the technical field of air purifying agents, and provides an attapulgite composite air purifying agent and a preparation method thereof. The attapulgite composite air purifying agent is prepared from the following raw materials in parts by weight: 10 to 70 parts of attapulgite, 6 to 10 parts of castor oil, 5 to 15 parts of photocatalyst air purifying liquid, 5 to 10 parts of methanol, 2 to 5 parts of glycerol, 5 to 10 parts of ethanol, 5 to 10 parts of sodium dodecyl benzene sulfonate, 2 to 5 parts of plant extracting solution, 1 to 5 parts of essence, 1 to 3 parts of surfactant, 10 to 15 parts of deionized water and 2 to 10 parts of wetting agent. The attapulgite composite air purifying agent contains attapulgite, harmful substances such as formaldehyde and the like can be decomposed to release harmless substances under the action of strongly adsorbing the harmful substances such as formaldehyde and the like in combination with other additives such as a photocatalyst air purifying solution, namely, existing peculiar smell molecules are neutralized and decomposed by adopting a multiple purification and decomposition technology, so that the air purifying effect is improved. Therefore, the air purifier has the characteristics of purifying air and removing peculiar smell substances such as formaldehyde and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of air purifiers, and in particular relates to an attapulgite composite air purifier and a preparation method thereof. Background Art

[0002] Air purifiers are products that utilize the adsorption principle of natural substances and are processed by modern science and technology. There are many air purifiers on the market, and they are mixed; generally speaking, there are the following types: adsorption-type air purifiers, such as activated carbon, bamboo charcoal and coconut charcoal; covering-type deodorizing products, such as condensation deodorizing boxes and air fresheners.

[0003] In the relevant prior art, a Chinese invention patent application discloses a name of an attapulgite granular air purifier and a preparation method thereof, with publication number CN104069526A. The specific technical solution disclosed in the patent is: "An attapulgite granular air purifier, made from the following component raw materials in parts by weight: 40-50 parts of modified attapulgite, 4-6 parts of chamomile essential oil, 2-3 parts of ylang-ylang essential oil, 1-2 parts of eucalyptus essential oil, 1-2 parts of jasmine essential oil, 1-2 parts of frankincense essential oil, 6-8 parts of glycerol, 8-10 parts of ethanol, 1-2 parts of chitosan, 6-8 parts of sodium fluoride, 4-5 parts of tartaric acid, and 8-10 parts of sodium dodecylbenzene sulfonate. During the preparation, the modified attapulgite is mixed with chitosan, sodium fluoride, tartaric acid, and sodium dodecylbenzene sulfonate to form granules, and then the granules are evenly mixed with chamomile essential oil and other essential oils and packaged." Although this product has the effect of purifying the air and killing bacteria, it is not effective in removing formaldehyde, resulting in poor air purification and removal of formaldehyde and other odorous substances. Summary of the invention

[0004] In view of the above problems existing in the prior art, the object of the present invention is to provide a composite air purifier of attapulgite and a preparation method thereof, which has the characteristics of purifying air and removing odorous substances such as formaldehyde.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A composite air purifier made of attapulgite is composed of the following raw materials in parts by weight: 10-70 parts of attapulgite, 6-10 parts of castor oil, 5-15 parts of photocatalyst air purification liquid, 5-10 parts of methanol, 2-5 parts of glycerol, 5-10 parts of ethanol, 5-10 parts of sodium dodecylbenzene sulfonate, 2-5 parts of plant extract, 1-5 parts of essence, 1-3 parts of surfactant, 10-15 parts of deionized water and 2-10 parts of wetting agent.

[0007] As a preferred technical solution of the present invention, the present invention comprises 32 parts of attapulgite, 8 parts of castor oil, 7 parts of methanol, 2 parts of glycerol, 6 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 12 parts of deionized water, 9 parts of wetting agent, 7.7 parts of photocatalyst air purification liquid, 3.3 parts of plant extract, 2.5 parts of flavor and 2.5 parts of surfactant.

[0008] As a preferred technical solution of the present invention, the present invention comprises 31.5 parts of attapulgite, 8.5 parts of castor oil, 5.5 parts of methanol, 3 parts of glycerol, 5.5 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 15 parts of deionized water, 3 parts of wetting agent, 10 parts of photocatalyst air purification liquid, 4 parts of plant extract, 4 parts of essence and 2 parts of surfactant.

[0009] The present invention also provides a method for preparing the above-mentioned attapulgite composite air purifier, which comprises the following steps:

[0010] S1, 10-70 parts of attapulgite, 6-10 parts of castor oil, 5-10 parts of methanol, 2-5 parts of glycerol, 5-10 parts of ethanol, 5-10 parts of sodium dodecylbenzene sulfonate, 10-15 parts of deionized water, and 2-10 parts of a wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 35-50°C, a speed V of the stirrer is 100-180r / min, and the stirring time t1 is at least 3h, and after stirring, the precipitate is heated at a heating temperature K2 of 125-180°C, a drying machine is used for drying time t2 of 36-96h, and then ground into powder using a grinder to obtain modified attapulgite;

[0011] S2, uniformly mixing the modified attapulgite obtained in step S1 with photocatalyst air purification liquid, plant extract, essence, and surfactant according to a matching ratio to obtain a mixture;

[0012] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 200-350° C. for an activation time t3 of at least 6 hours and a standing time t4 of 1-5 hours to obtain the attapulgite composite air purifier.

[0013] As a preferred technical solution of the present invention, in step S1

[0014] The temperature K1 is set to 35-50°C, the speed V of the stirrer is set to 100-180r / min, and the stirring time t1 is at least 3h. After stirring, the mixture is placed in a centrifugal device for centrifugal separation. After centrifugation, the precipitate is heated at a heating temperature K2 of 125-180°C and dried in a dryer for t2 of 36-96h, and then ground into powder using a grinder to obtain modified concave soil.

[0015] As a preferred technical solution of the present invention, the mixing ratio of the photocatalyst air purification liquid, plant extract, essence and surfactant in step S2 is (1-5): (0.5-3): (0.4-1): (0.2-1).

[0016] As a preferred technical solution of the present invention, in step S3, the calcination temperature K3 is 260° C., the activation time t3 is 7 h, and the standing time t4 is 5 h.

[0017] The present invention relates to an attapulgite composite air purifier and a preparation method thereof, which have the following beneficial effects: the attapulgite composite air purifier contains attapulgite, which can strongly adsorb harmful substances such as formaldehyde, and in combination with other additives such as photocatalyst air purification liquid, can also decompose the adsorbed formaldehyde and other harmful substances to release harmless substances, that is, by adopting multiple purification and decomposition technologies, the existing odor molecules are neutralized and decomposed, thereby having the characteristics of purifying air and removing formaldehyde and other odorous substances.

[0018] The present invention will be further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the actual product picture of the attapulgite composite air purifier applied for by the present invention;

[0020] Figure 2 This is a test report diagram of the concave clay composite air purifier applied for in the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0023] Preparation of raw materials

[0024] The attapulgite composite air purifier applied for by the present invention is composed of the following raw materials by weight: 10-70 parts of attapulgite, 6-10 parts of castor oil, 5-15 parts of photocatalyst air purification liquid, 5-10 parts of methanol, 2-5 parts of propylene glycol, 5-10 parts of ethanol, 5-10 parts of sodium dodecylbenzene sulfonate, 2-5 parts of plant extract, 1-5 parts of flavor, 1-3 parts of surfactant, 10-15 parts of deionized water, and 2-10 parts of wetting agent.

[0025] In order to prepare the attapulgite composite air purifier of the present invention, the present invention application provides 6 embodiments, 3 comparative examples and 1 test example, wherein Figure 1 The product image is obtained in Example 3 of the present invention, and the specific process is as follows.

[0026] Example 1

[0027] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0028] S1, 56 parts of attapulgite, 6 parts of castor oil, 5 parts of methanol, 2 parts of glycerol, 5 parts of ethanol, 5 parts of sodium dodecylbenzene sulfonate, 10 parts of deionized water, and 2 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 35-50°C, and the speed V of the stirrer is 100-180r / min and the stirring time t1 is at least 3h. After stirring, the precipitate is heated at a heating temperature K2 of 125°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for drying time t2 of 40h, and then ground into powder using a grinder to obtain modified attapulgite;

[0029] S2, 91 parts of the modified attapulgite obtained in step S1 are uniformly mixed with 5 parts of photocatalyst air purification liquid, 2 parts of plant extract, 1 part of flavor, and 1 part of surfactant according to a proportion to obtain a mixture; wherein the mixing ratio of the photocatalyst air purification liquid, the plant extract, the flavor, and the surfactant is 1:0.4:0.2:0.2;

[0030] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 210° C. for an activation time t3 of 6 hours and a standing time t4 of 3 hours to obtain the attapulgite composite air purifier.

[0031] Example 2

[0032] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0033] S1, 40 parts of attapulgite, 8 parts of castor oil, 6 parts of methanol, 2.5 parts of glycerol, 5.5 parts of ethanol, 7 parts of sodium dodecylbenzene sulfonate, 13 parts of deionized water, and 2 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 40°C, and the speed V of the stirrer is 160r / min and the stirring time t1 is 4.5h. After stirring, the precipitate is heated at a heating temperature K2 of 160°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for drying time t2 of 72h, and then ground into powder using a grinder to obtain modified attapulgite;

[0034] S2, 86 parts of the modified attapulgite obtained in step S1 are uniformly mixed with 6 parts of photocatalyst air purification liquid, 4 parts of plant extract, 2 parts of flavor, and 2 parts of surfactant according to a proportion to obtain a mixture; wherein the mixing ratio of the photocatalyst air purification liquid, the plant extract, the flavor, and the surfactant is 1.2:0.8:0.4:0.4;

[0035] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 250° C. for an activation time t3 of 6 hours and a standing time t4 of 5 hours to obtain the attapulgite composite air purifier.

[0036] Example 3

[0037] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0038] S1, 32 parts of attapulgite, 8 parts of castor oil, 7 parts of methanol, 2 parts of glycerol, 6 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 12 parts of deionized water, and 9 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 45°C, and the speed V of the stirrer is 170r / min and the stirring time t1 is 5h. After stirring, the precipitate is heated at a heating temperature K2 of 125-180°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for a drying time t2 of 90h, and then ground into powder using a grinder to obtain modified attapulgite;

[0039] S2, the modified attapulgite obtained in step S1 is uniformly mixed with photocatalyst air purification liquid, plant extract, essence, and surfactant according to a proportion to obtain a mixture; wherein the mixing ratio of the modified attapulgite to 7.7 parts of photocatalyst air purification liquid, 3.3 parts of plant extract, 2.5 parts of essence, and 2.5 parts of surfactant is 1.54:0.66:0.5:0.5;

[0040] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 260° C. for an activation time t3 of 7 hours and a standing time t4 of 5 hours to obtain the attapulgite composite air purifier.

[0041] Example 4

[0042] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0043] S1, 31.5 parts of attapulgite, 8.5 parts of castor oil, 5.5 parts of methanol, 3 parts of glycerol, 5.5 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 15 parts of deionized water, and 3 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 47°C, and the speed V of the stirrer is 145r / min and the stirring time t1 is 3.5h. After stirring, the precipitate is heated at a heating temperature K2 of 130°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for a drying time t2 of 60h, and then ground into powder using a grinder to obtain modified attapulgite;

[0044] S2, 80 parts of the modified attapulgite obtained in step S1, 10 parts of the photocatalyst air purification liquid, 4 parts of the plant extract, 4 parts of the essence, and 2 parts of the surfactant are mixed uniformly according to a proportion to obtain a mixture; wherein the mixing ratio of 10 parts of the photocatalyst air purification liquid, 4 parts of the plant extract, 4 parts of the essence, and 2 parts of the surfactant is 2:0.8:0.8:0.4;

[0045] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 280° C. for an activation time t3 of 7.5 h and a standing time t4 of 3.5 h to obtain the attapulgite composite air purifier.

[0046] Example 5

[0047] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0048] S1, 27 parts of attapulgite, 9 parts of castor oil, 9 parts of methanol, 5.5 parts of glycerol, 5.5 parts of ethanol, 7.5 parts of sodium dodecylbenzene sulfonate, 12.5 parts of deionized water, and 6 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 48°C, and the speed V of the stirrer is 175r / min and the stirring time t1 is 5h. After stirring, the precipitate is heated at a heating temperature K2 of 130°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for a drying time t2 of 96h, and then ground into powder using a grinder to obtain modified attapulgite;

[0049] S2, 82 parts of the modified attapulgite obtained in step S1 are uniformly mixed with 10 parts of photocatalyst air purification liquid, 4 parts of plant extract, 1 part of flavor, and 3 parts of surfactant according to a proportion to obtain a mixture; wherein the mixing ratio of the photocatalyst air purification liquid, the plant extract, the flavor, and the surfactant is 2:0.8:0.2:0.6;

[0050] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 280° C. for an activation time t3 of 8 hours and a standing time t4 of 3 hours to obtain the attapulgite composite air purifier.

[0051] Example 6

[0052] A method for preparing an attapulgite composite air purifier comprises the following steps:

[0053] S1, 15 parts of attapulgite, 10 parts of castor oil, 10 parts of methanol, 2 parts of glycerol, 10 parts of ethanol, 10 parts of sodium dodecylbenzene sulfonate, 10 parts of deionized water, and 5 parts of wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 50°C, and the speed V of the stirrer is 180r / min and the stirring time t1 is 3h. After stirring, the precipitate is heated at a heating temperature K2 of 180°C and a multifunctional drum dryer (the equipment is an electric heating product of Leige Machinery Equipment Co., Ltd.) is used for a drying time t2 of 96h, and then ground into powder using a grinder to obtain modified attapulgite;

[0054] S2, 72 parts of the modified attapulgite obtained in step S1 are uniformly mixed with 15 parts of photocatalyst air purification liquid, 5 parts of plant extract, 5 parts of essence, and 3 parts of surfactant according to a proportion to obtain a mixture; wherein the mixing ratio of the photocatalyst air purification liquid, the plant extract, the essence, and the surfactant is 3:1:1:0.6;

[0055] S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 350° C. for an activation time t3 of 8 hours and a standing time t4 of 5 hours to obtain the attapulgite composite air purifier.

[0056] Comparative Example 1

[0057] During the preparation of the above-mentioned attapulgite composite air purifier, no attapulgite was added, and other preparation conditions remained the same as those in Example 1.

[0058] Comparative Example 2

[0059] During the preparation of the above-mentioned attapulgite composite air purifier, no photocatalyst air purifier liquid was added, and other preparation conditions remained the same as those in Example 1.

[0060] Comparative Example 3

[0061] During the preparation of the above-mentioned attapulgite composite air purifier, no plant extract was added, and other preparation conditions remained the same as those in Example 1.

[0062] Test example

[0063] During the preparation of the above-mentioned attapulgite composite air purifier, no attapulgite, photocatalyst air purification liquid, or plant extract was added, and other preparation conditions remained the same as those in Example 1.

[0064] The attapulgite composite air purifier products obtained in the above-mentioned embodiments 1-6, comparative examples 1-3 and test examples are configured into 10 portions; wherein the formaldehyde removal rate is determined: the formaldehyde concentration in the collected samples is detected according to GB / T18883-2002 "Indoor Air Quality Standard"; the main instruments include MEF500 formaldehyde tester produced by Silezhi Company and electronic (HORDE ELECTRI C) gas chromatograph produced by Shandong Holder Electronic Technology Co., Ltd.; it is carried out in a simulated test chamber, 0.05g formaldehyde (analytical pure, ≥99%) is placed in the test chamber and volatilized for 15h before sampling to test the initial formaldehyde concentration in the chamber (C1), 5g of attapulgite composite air purifier is placed in the test chamber, and the fan is powered on and operated for 5h to sample the formaldehyde concentration in the chamber (C3); wherein the formaldehyde removal rate (%) = (C1-C3) / C1×100;

[0065] The specific test results are shown in Table 1.

[0066] Table 1: Performance test results of attapulgite composite air purifier products of Examples 1-6, Comparative Examples 1-3 and Test Examples

[0067] serial number Formaldehyde removal rate (%) Negative ion generation (pcs / cm3) Example 1 87 1042 Example 2 92 1156 Example 3 95.3 1321 Example 4 95.1 1332 Example 5 90.4 1109 Example 6 86 1067 Comparative Example 1 50.4 743 Comparative Example 2 52.1 751 Comparative Example 3 65 857 Test example 33 436

[0068] The products obtained in Example 4 and the test example were sent to Guangzhou Institute of Microbiology Co., Ltd. for testing. The test report is shown in Figure 2 .

[0069] From the above table 1, the test results (see Figure 2 )and Figure 1It can be seen that: compared with comparative examples 1-3 and the test examples, the formaldehyde removal rates of the attapulgite composite air purifiers of Examples 1-6 are all greater than 85%, and the amount of negative ions generated is distributed in more than 1000 / cubic centimeter, among which the formaldehyde removal rates and the amount of negative ions generated in Examples 3 and 4 are better; the attapulgite composite air purifier of the present invention contains attapulgite, which can strongly adsorb harmful substances such as formaldehyde, and can also decompose harmful substances such as adsorbed formaldehyde to release harmless substances in combination with other additives such as photocatalyst air purification liquid; specifically, after modification, the attapulgite can produce some carboxyl groups and other groups, and these surface groups are conducive to other species such as formaldehyde to react with it, adsorb it on its surface, and then decompose it with substances such as photocatalyst air purification liquid to produce harmless substances such as carbon dioxide for discharge, and compared with the test examples, the adsorption and decomposition effect is significant; that is, by adopting multiple purification and decomposition technologies, the odor molecules present are neutralized and decomposed, so it has the characteristics of air purification and removal of formaldehyde and other odorous substances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A composite air purifier made of attapulgite, characterized in that: The invention is composed of the following raw materials in parts by weight: 10-70 parts of attapulgite, 6-10 parts of castor oil, 5-15 parts of photocatalyst air purification liquid, 5-10 parts of methanol, 2-5 parts of propylene glycol, 5-10 parts of ethanol, 5-10 parts of sodium dodecylbenzene sulfonate, 2-5 parts of plant extract, 1-5 parts of flavor, 1-3 parts of surfactant, 10-15 parts of deionized water and 2-10 parts of wetting agent.

2. The attapulgite composite air purifier according to claim 1, characterized in that: The ingredients include 32 parts of attapulgite, 8 parts of castor oil, 7 parts of methanol, 2 parts of glycerol, 6 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 12 parts of deionized water, 9 parts of wetting agent, 7.7 parts of photocatalyst air purification liquid, 3.3 parts of plant extract, 2.5 parts of flavor and 2.5 parts of surfactant.

3. The attapulgite composite air purifier according to claim 1, characterized in that: The ingredients include 31.5 parts of attapulgite, 8.5 parts of castor oil, 5.5 parts of methanol, 3 parts of glycerol, 5.5 parts of ethanol, 8 parts of sodium dodecylbenzene sulfonate, 15 parts of deionized water, 3 parts of wetting agent, 10 parts of photocatalyst air purification liquid, 4 parts of plant extract, 4 parts of essence and 2 parts of surfactant.

4. A method for preparing a composite air purifier of attapulgite as claimed in any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps S1, 10-70 parts of attapulgite, 6-10 parts of castor oil, 5-10 parts of methanol, 2-5 parts of glycerol, 5-10 parts of ethanol, 5-10 parts of sodium dodecylbenzene sulfonate, 10-15 parts of deionized water, and 2-10 parts of a wetting agent are placed in a centrifugal device for centrifugal separation at a set temperature K1 of 35-50°C, a speed V of the stirrer is 100-180r / min, and the stirring time t1 is at least 3h, and after stirring, the precipitate is heated at a heating temperature K2 of 125-180°C, a drying machine is used for drying time t2 of 36-96h, and then ground into powder using a grinder to obtain modified attapulgite; S2, uniformly mixing the modified attapulgite obtained in step S1 with photocatalyst air purification liquid, plant extract, essence, and surfactant according to a matching ratio to obtain a mixture; S3. Granulate the mixture obtained in step S2 using a granulator, and then roast it at a roasting temperature K3 of 200-350° C. for an activation time t3 of at least 6 hours and a standing time t4 of 1-5 hours to obtain the attapulgite composite air purifier.

5. The preparation method according to claim 4, characterized in that: In step S1, the temperature K1 is set to 35-50°C, the speed V of the stirrer is used to be 100-180r / min, and the stirring time t1 is at least 3h. After stirring, the mixture is placed in a centrifugal device for centrifugal separation. After centrifugation, the precipitate is heated at a heating temperature K2 of 125-180°C and dried in a dryer for t2 of 36-96h, and then ground into powder using a grinder to obtain modified concave soil.

6. The preparation method according to claim 4, characterized in that: The mixing ratio of the photocatalyst air purification liquid, the plant extract, the essence and the surfactant in step S2 is (1-5): (0.5-3): (0.4-1): (0.2-1).

7. The preparation method according to claim 4, characterized in that: In step S3, the calcination temperature K3 is 260° C., the activation time t3 is 7 h, and the standing time t4 is 5 h.

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