An environmentally friendly ecological water filter board that can purify air and its preparation method

Abstract

This invention discloses an environmentally friendly ecological water filter board capable of purifying air and its preparation method. The environmentally friendly ecological water filter board is formed by mixing raw materials and then pressing them together. The materials include: 300-380 parts by weight of aggregate, 50-70 parts by weight of polymer and resin-modified cement-based composite binder, and 10-30 parts by weight of composite purifying agent; the composite purifying agent is zinc oxide-titanium dioxide-graphene nanocomposite powder. The environmentally friendly ecological water filter board of this invention has excellent compressive strength, wear resistance, and water permeability, while also possessing air purification functions, capable of purifying harmful gases such as nitrogen oxides and toluene in the air. It can be widely used in municipal roads, residential areas, parks, pedestrian streets, etc.

Description

Technical Field

[0001] This application belongs to the field of environmentally friendly road surface technology, specifically relating to an environmentally friendly ecological water filter board that can purify air and its preparation method. Background Technology

[0002] Permeable pavements are gaining popularity, and many places are starting to build sponge cities to alleviate urban flooding problems. The main harmful components of vehicle exhaust include NO. x To reduce the harm of vehicle exhaust fumes, which contain HC compounds, CO, SO2, etc., one measure is to use environmentally friendly pavement materials that can purify the air. Currently, the purification mechanisms of environmentally friendly pavement materials mainly fall into two categories: one is physical adsorption, but physical adsorption is reversible; once saturated, it will release the pollutants in situ, potentially causing even greater pollution. The other type utilizes photocatalysts to degrade harmful components in exhaust gases. A common photocatalyst is titanium dioxide, but its narrow spectral range means it absorbs less than 10% of visible light, limiting its air purification effect. In fact, existing permeable pavement materials with air-purifying effects generally have limited purification capabilities and require further improvement. Summary of the Invention

[0003] The purpose of this application is to provide an environmentally friendly ecological water filter board that can purify air and its preparation method. The environmentally friendly ecological water filter board has a high-efficiency air purification effect while ensuring strength, wear resistance and water permeability.

[0004] On the one hand, the present application provides an environmentally friendly ecological water filter board that can purify air, which is formed by mixing raw materials and pressing them together. The raw materials include: 300 to 380 parts by weight of aggregate, 50 to 70 parts by weight of polymer and resin modified cement-based composite binder, and 10 to 30 parts by weight of composite purifier.

[0005] The composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, which is prepared by the following method:

[0006] (1) Dissolve zinc acetate and sodium carbonate in water, then add graphene powder, keep stirring for 2-3 hours, filter to obtain precipitate, wash the precipitate with water and dry it to obtain precursor, calcine the precursor at 500-600℃ for 1-2 hours to obtain zinc oxide-graphene nanocomposite powder.

[0007] (2) Zinc oxide-graphene nanocomposite powder was mixed with anhydrous ethanol and glacial acetic acid, and then tetrabutyl titanate was added for hydrolysis. After being evaporated in a water bath, it was dried to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder.

[0008] (3) The zinc oxide-titanium dioxide-graphene nanocomposite powder was ball-milled;

[0009] In step (1), the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:10 to 15:44;

[0010] In step (2), the mass ratio of zinc oxide-graphene nanocomposite powder to tetrabutyl titanate is 30:6-9.

[0011] In some specific embodiments, the aggregate is quartz sand with a particle size of 40 to 60 mesh.

[0012] In some specific embodiments, the polymer- and resin-modified cement-based composite binder is composed of a resin base, cement-based materials, and nano-grade pure acrylic emulsion in a weight ratio of 3-5:10-20:2-4; wherein: every 100 parts by weight of the resin base includes: 50-70 parts by weight of aspartic polyurea resin, 20-40 parts by weight of aliphatic isocyanate, and 5-10 parts by weight of elastomeric polyurea curing agent; every 100 parts by weight of the cement-based materials includes: 50-60 parts by weight of cement, 12-20 parts by weight of strength-enhancing expansion agent, 6-30 parts by weight of stone powder, 0-10 parts by weight of pigment, 1-2 parts by weight of dispersant, 1-2 parts by weight of defoamer, 1-2 parts by weight of water-retaining agent, and 1-3 parts by weight of setting regulator.

[0013] In some specific embodiments, the raw materials include: 350-380 parts by weight of aggregate, 60-70 parts by weight of polymer and resin modified cement-based composite binder, and 16-24 parts by weight of composite purifying agent.

[0014] On the other hand, this application provides a method for preparing an environmentally friendly ecological water filter plate that can purify air, comprising:

[0015] (1) Take aggregate, polymer and resin modified cement-based composite binder and composite purifying agent according to the weight parts, put them into a mixing pot and stir to mix, then add mixing water and continue stirring to obtain a mixture;

[0016] (2) Spread the mixture evenly in the mold and compact it using static pressure.

[0017] (3) After maintenance, an environmentally friendly ecological water filter board is obtained.

[0018] In some specific implementations, the curing process includes: first curing in a curing room at a temperature of 30℃~40℃ for 5~7 days, and then curing outdoors at normal temperature for 14~28 days.

[0019] Compared with the prior art, this application has the following advantages and beneficial effects:

[0020] (1) The environmentally friendly ecological water filter board of this application has excellent compressive strength, wear resistance and water permeability, and also has air purification function. It can purify harmful gases such as nitrogen oxides and toluene in the air and can be widely used in municipal roads, communities, parks, pedestrian streets, etc.

[0021] (2) This application adds a zinc oxide-titanium dioxide-graphene nanocomposite purifier prepared by a specific method to the raw materials of traditional precast sand-based permeable materials. This does not affect the compressive strength, wear resistance and permeability of the permeable material. At the same time, the nanocomposite purifier can also oxidize harmful gases such as toluene and nitrogen oxides in the air through photocatalysis, decomposing the harmful gases into carbon dioxide and water, thereby achieving the effect of purifying the air.

[0022] (3) Based on conventional sand-based permeable bricks, this application adopts integral molding to make ecological filter boards, removing the permeable concrete bottom layer of conventional sand-based bricks. The main material composition of the main body includes ultrafine aggregates and composite binders. The use of composite binders and the design of removing the permeable concrete bottom layer can effectively avoid the problem of efflorescence of cement-based materials. The use of ultrafine aggregates as a whole forms very small permeable pores. Pollutants will only stay on the surface of the material and will not penetrate into the pores, which will not cause blockage and is also conducive to later maintenance. Detailed Implementation

[0023] To make the purpose, technical solution and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments.

[0024] This application provides an environmentally friendly ecological water filter board that can purify air, which is integrally pressed; wherein: the raw materials include: 300-380 parts by weight of aggregate, 50-70 parts by weight of polymer and resin modified cement-based composite binder, and 10-30 parts by weight of composite purifying agent.

[0025] In some specific embodiments, the raw materials include: 350-380 parts by weight of aggregate, 60-70 parts by weight of polymer and resin modified cement-based composite binder, and 16-24 parts by weight of composite purifying agent.

[0026] In some specific embodiments, the polymer and resin modified cement-based composite adhesive adopts the applicant's patented product, namely an adhesive for permeable pavement materials in Chinese Patent No. CN113831077B, which is obtained by modifying the cement-based adhesive with resin base and acrylic emulsion.

[0027] The aforementioned composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, which is prepared by the following method;

[0028] (1) Dissolve zinc acetate and sodium carbonate in water, then add graphene powder and mix. Keep stirring for 2-3 hours. Zinc acetate and sodium carbonate react to form a precipitate. Wash the precipitate with water and dry it to obtain a precursor. Calcine the precursor at 500-600℃ for 1-2 hours to obtain zinc oxide-graphene nanocomposite powder.

[0029] In this step, zinc acetate and sodium carbonate react to produce zinc hydroxide precipitate and soluble sodium salt. The zinc hydroxide precipitate decomposes into zinc oxide upon calcination. Calcination at 500–600°C facilitates the decomposition of nano-sized zinc oxide.

[0030] (2) Zinc oxide-graphene nanocomposite powder is mixed with anhydrous ethanol and glacial acetic acid, and then tetrabutyl titanate is added for hydrolysis for 0.5-1h. After being evaporated in a water bath, it is dried to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder.

[0031] (3) The zinc oxide-titanium dioxide-graphene nanocomposite powder was ball-milled.

[0032] In this specific embodiment, the mass ratio of zinc acetate, sodium carbonate and graphene powder in step (1) is 22:10 to 15:44; in step (2), the mass ratio of zinc oxide-graphene nanocomposite powder, glacial acetic acid and tetrabutyl titanate is 30:2 to 5:6 to 9, and the ratio of tetrabutyl titanate to anhydrous ethanol is 6 to 9 g: 80 to 100 mL.

[0033] In this application, zinc oxide and titanium dioxide act as photocatalysts. Photogenerated electrons are transferred through the interface formed between the semiconductor materials (zinc oxide and titanium dioxide) and graphene. Insufficient graphene content hinders sufficient contact between the semiconductor materials and graphene, thus affecting electron transfer. Conversely, since graphene itself has virtually no photocatalytic effect, excessive graphene content negatively impacts the photocatalytic performance of zinc oxide and titanium dioxide. Therefore, a specific amount of graphene is required to further enhance air purification.

[0034] In this specific embodiment, the preparation method of the above-mentioned environmentally friendly ecological water filter board includes:

[0035] (1) Take aggregate, polymer and resin modified cement-based composite binder and composite purifying agent by weight, put them into a mixing pot and stir to mix, then add mixing water and continue stirring to obtain a mixture; the amount of mixing water is the conventional amount, and in some specific embodiments, the amount of mixing water is 3% to 8% of the weight of the raw material mixture.

[0036] (2) Place the mixture in a mold and compact it using static pressure.

[0037] (3) After maintenance, an environmentally friendly ecological water filter board is obtained.

[0038] Several embodiments and comparative examples will be provided below. It should be noted that in the embodiments and comparative examples, the aggregate used is quartz sand with a particle size of 40 to 60 mesh, and the graphene powder used has a particle size of 3 to 9 nm.

[0039] The polymer and resin modified cement-based composite adhesive uses the adhesive from Chinese Patent Publication No. CN113831077B, specifically the product from Example 1 of that Chinese patent. The specific preparation method is as follows:

[0040] (1) Preparation of cement-based materials:

[0041] Weigh the raw materials: 50 parts by weight of PⅠ52.5 type silicate cement, 12 parts by weight of strength-enhancing expansion agent, 30 parts by weight of stone powder, 4 parts by weight of iron oxide red pigment, 1 part by weight of dispersant, 1 part by weight of P8850 defoamer, 1 part by weight of wood fiber, and 1 part by weight of setting regulator.

[0042] (2) Preparation of resin base material:

[0043] Weigh the raw materials: 50 parts by weight of aspartic polyurea resin, 40 parts by weight of aliphatic isocyanate, and 10 parts by weight of elastomer polyurea curing agent.

[0044] (3) Preparation of adhesive:

[0045] According to the weight ratio of resin base material: cement base material: nano-grade pure acrylic emulsion = 3:10:2, first mix the cement base material and nano-grade pure acrylic emulsion for 3 minutes until a uniform slurry is formed, then add the mixed resin base material and continue mixing for 3 minutes to obtain the polymer and resin modified cement-based composite adhesive.

[0046] Example 1

[0047] The environmentally friendly ecological water filter board in this embodiment is integrally pressed; the raw materials include: 350 parts by weight of quartz sand, 60 parts by weight of polymer and resin modified cement-based composite adhesive, and 16 parts by weight of composite purifying agent.

[0048] The composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, prepared using the following method:

[0049] (1) Dissolve zinc acetate and sodium carbonate in water, add graphene powder, keep stirring for 3 hours, filter to obtain white precipitate, wash the precipitate repeatedly with distilled water until the precipitate is neutral; then evaporate to dryness in water bath and dry in oven to obtain precursor, put the precursor into muffle furnace and calcine at 500℃ for 1 hour to obtain zinc oxide-graphene nanocomposite powder.

[0050] (2) Take zinc oxide-graphene nanocomposite powder, anhydrous ethanol and glacial acetic acid and mix them together. Then add tetrabutyl titanate for hydrolysis. After evaporation in a water bath, put it in an oven for drying to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder.

[0051] (3) Place the zinc oxide-titanium dioxide-graphene nanocomposite powder into a ball mill and ball mill for 1 hour;

[0052] In step (1), the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:10:44; in step (2), the mass ratio of zinc oxide-graphene nanocomposite powder, glacial acetic acid and tetrabutyl titanate is 30:2:6, and the ratio of tetrabutyl titanate to anhydrous ethanol is 6g:80ml.

[0053] Example 2

[0054] The environmentally friendly ecological water filter board in this embodiment is integrally pressed; the raw materials include: 360 parts by weight of quartz sand, 65 parts by weight of polymer and resin modified cement-based composite adhesive, and 18 parts by weight of composite purifying agent.

[0055] The composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, which is prepared by the following method:

[0056] (1) Dissolve zinc acetate and sodium carbonate in water, add graphene powder, keep stirring for 3 hours, filter to obtain white precipitate, wash the precipitate repeatedly with distilled water until the precipitate is neutral; then evaporate to dryness in water bath and dry in oven to obtain precursor, put the precursor into muffle furnace and calcine at 500℃ for 1 hour to obtain zinc oxide-graphene nanocomposite powder.

[0057] (2) Take zinc oxide-graphene nanocomposite powder, anhydrous ethanol and glacial acetic acid and mix them together. Then add tetrabutyl titanate for hydrolysis. After evaporation in a water bath, put it in an oven for drying to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder.

[0058] (3) Place the zinc oxide-titanium dioxide-graphene nanocomposite powder into a ball mill and ball mill for 1 hour;

[0059] In step (1), the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:13:44; in step (2), the mass ratio of zinc oxide-graphene nanocomposite powder, glacial acetic acid and tetrabutyl titanate is 30:3:7, and the ratio of tetrabutyl titanate to anhydrous ethanol is 7g:90ml.

[0060] Example 3

[0061] The environmentally friendly ecological water filter board in this embodiment is integrally pressed; the raw materials include: 380 parts by weight of quartz sand, 70 parts by weight of polymer and resin modified cement-based composite adhesive, and 24 parts by weight of composite purifying agent.

[0062] The composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, which is prepared by the following method:

[0063] (1) Dissolve zinc acetate and sodium carbonate in water, add graphene powder, keep stirring for 3 hours, filter to obtain white precipitate, wash the precipitate repeatedly with distilled water until the precipitate is neutral; then evaporate to dryness in water bath and dry in oven to obtain precursor, put the precursor into muffle furnace and calcine at 500℃ for 1 hour to obtain zinc oxide-graphene nanocomposite powder.

[0064] (2) Take zinc oxide-graphene nanocomposite powder, anhydrous ethanol and glacial acetic acid and mix them together. Then add tetrabutyl titanate for hydrolysis. After evaporation in a water bath, put it in an oven for drying to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder.

[0065] (3) Place the zinc oxide-titanium dioxide-graphene nanocomposite powder into a ball mill and ball mill for 1 hour;

[0066] In step (1), the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:15:44; in step (2), the mass ratio of zinc oxide-graphene nanocomposite powder, glacial acetic acid and tetrabutyl titanate is 30:5:9, and the ratio of tetrabutyl titanate to anhydrous ethanol is 9g:100ml.

[0067] Comparative Example 1

[0068] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 350 parts by weight of quartz sand, 60 parts by weight of polymer and resin modified cement-based composite binder, and 16 parts by weight of single-component purifying agent.

[0069] The single-component purifying agent is nano-zinc oxide, which is prepared in-house using the following method:

[0070] Zinc acetate and sodium carbonate were dissolved in water at a weight ratio of 22:10 and stirred for 3 hours. After filtration, a white precipitate was obtained. The precipitate was repeatedly washed with distilled water until it was neutral. Then, it was dried in a water bath and an oven to obtain a precursor. The precursor was placed in a muffle furnace and calcined at 500°C for 1 hour to obtain nano zinc oxide.

[0071] Comparative Example 2

[0072] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 360 parts by weight of quartz sand, 65 parts by weight of polymer and resin modified cement-based composite binder, and 18 parts by weight of single-component purifying agent.

[0073] The single-component purifying agent is nano-titanium dioxide, which is prepared in-house using the following method:

[0074] Anhydrous ethanol, glacial acetic acid and tetrabutyl titanate were mixed to hydrolyze the tetrabutyl titanate. After being evaporated to dryness in a water bath, the mixture was dried in an oven to obtain nano-titanium dioxide. The mass ratio of glacial acetic acid to tetrabutyl titanate was 1:3, and the mass ratio of tetrabutyl titanate to anhydrous ethanol was 3g:90ml.

[0075] Comparative Example 3

[0076] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 380 parts by weight of quartz sand, 70 parts by weight of polymer and resin modified cement-based composite binder, and 24 parts by weight of composite purifying agent.

[0077] The composite purifying agent is a zinc oxide-titanium dioxide nanocomposite powder, prepared using the following method:

[0078] (1) Zinc acetate and sodium carbonate were dissolved in water at a weight ratio of 22:10, stirred for 3 hours, filtered to obtain a white precipitate, and the precipitate was repeatedly washed with distilled water until it was neutral; then it was dried in a water bath and an oven to obtain a precursor. The precursor was placed in a muffle furnace and calcined at 500°C for 1 hour to obtain nano zinc oxide.

[0079] (2) Take nano zinc oxide, anhydrous ethanol and glacial acetic acid and mix them. Then add tetrabutyl titanate for hydrolysis. After evaporation in a water bath, dry it in an oven to obtain zinc oxide-titanium dioxide nanocomposite powder. The mass ratio of nano zinc oxide, glacial acetic acid and tetrabutyl titanate is 10:5:9, and the mass ratio of tetrabutyl titanate and anhydrous ethanol is 9g:100ml.

[0080] (3) Place the zinc oxide-titanium dioxide nanocomposite powder into a ball mill and ball mill for 1 hour.

[0081] Comparative Example 4

[0082] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 350 parts by weight of quartz sand, 60 parts by weight of polymer and resin modified cement-based composite adhesive, and 16 parts by weight of composite purifying agent.

[0083] The composite purifying agent is a zinc oxide-graphene nanocomposite powder, prepared using the following method:

[0084] (1) Dissolve zinc acetate and sodium carbonate in water, add graphene powder, keep stirring for 3 hours, filter to obtain white precipitate, wash the precipitate repeatedly with distilled water until the precipitate is neutral; then evaporate to dryness in a water bath and dry in an oven to obtain a precursor, put the precursor into a muffle furnace and calcine at 500℃ for 1 hour to obtain zinc oxide-graphene nanocomposite powder; wherein, the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:10:44;

[0085] (2) Place the zinc oxide-graphene nanocomposite powder into a ball mill and ball mill for 1 hour.

[0086] Comparative Example 5

[0087] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 350 parts by weight of quartz sand, 60 parts by weight of polymer and resin modified cement-based composite adhesive, and 16 parts by weight of composite purifying agent.

[0088] The composite purifying agent is a titanium dioxide-graphene nanocomposite powder, prepared using the following method:

[0089] (1) Take graphene powder, anhydrous ethanol and glacial acetic acid and mix them. Then add tetrabutyl titanate for hydrolysis. After evaporation in a water bath, dry it in an oven to obtain titanium dioxide-graphene nanocomposite powder. The mass ratio of graphene powder, glacial acetic acid and tetrabutyl titanate is 20:2:6, and the mass ratio of tetrabutyl titanate and anhydrous ethanol is 6g:80ml.

[0090] (2) Put the titanium dioxide-graphene nanocomposite powder into a ball mill and ball mill for 1 hour.

[0091] Comparative Example 6

[0092] This comparative environmentally friendly ecological water filter board is integrally pressed; the raw materials include: 350 parts by weight of quartz sand, 60 parts by weight of polymer and resin modified cement-based composite binder, 4.728 parts by weight of nano zinc oxide, 1.816 parts by weight of nano titanium dioxide, and 9.456 parts by weight of graphene.

[0093] In this comparative example, nano zinc oxide was prepared using the method disclosed in Comparative Example 1, and nano titanium dioxide was prepared using the method disclosed in Comparative Example 2.

[0094] The above-described embodiments and comparative examples of environmentally friendly ecological water filter boards were all prepared using the following method:

[0095] (1) Take quartz sand, polymer and resin modified cement-based composite binder and purifying agent by weight, put them into a mixing pot, stir for 1 minute using a mortar mixer, continue stirring and slowly pour in the mixing water, stir for another 3 minutes after the mixing water is added, at this time the raw materials are mixed evenly and in the form of small agglomerates, and the mixture is obtained; the amount of mixing water is 5% of the raw material mixture.

[0096] (2) Place the mixture into a mold and compact it using a static pressure molding machine;

[0097] (3) After being placed in a 30℃ curing room for 7 days, the ecological filter board is then sent outdoors to be cured at room temperature for 28 days.

[0098] The performance of the ecological water filter boards in the examples and comparative examples was tested using the following methods:

[0099] 1. Compressive strength: Tested according to Appendix A of JC / T945-2005 "Industry Standard for Permeable Bricks";

[0100] 2. Abrasion resistance: The length of the abrasion pits was tested according to GB / T12988 "Test Method for Abrasion Resistance of Inorganic Flooring Materials";

[0101] 3. Permeability coefficient: Tested according to the testing methods in JC / T945-2005 "Industry Standard for Permeable Bricks";

[0102] 4. NOx reduction rate: The ecological filter boards were placed in sealed glass containers of the same volume. The initial concentration of nitrogen oxides in each glass container was 350 mg / L. After the ecological filter boards were placed for 24 hours, the concentration of nitrogen oxides in the glass containers was tested by the spectrophotometric method of naphthylethylenediamine hydrochloride, and the NOx reduction rate was calculated.

[0103] 5. Place the ecological filter plate in sealed glass boxes of the same volume to simulate an environment with a toluene pollution concentration of 200 μg / L. Place each glass box under the same lighting conditions. Connect the bottom pressure equalization port of each glass box to a water tank to maintain the air pressure and pollutant gas concentration within the glass box during sampling. Turn on the convection fan to maintain equal gas concentration throughout the glass box. After introducing pollutant gas to the initial concentration, close the air inlet to begin the photodegradation process. Then, sample the air in the glass box using a micro-sampling pump, and use gas chromatography to determine the changes in gas content during the degradation process. Calculate the toluene removal rate according to the formula. Where C0 represents the initial concentration of toluene at the start of degradation, in μg / m³. 3 C t This indicates the equilibrium concentration of pollutant gas at the end of the test, in μg / m³. 3 The testing time for all embodiments and comparative examples was 6 hours.

[0104] Table 1 Performance test data of the ecological filter boards in the embodiments and comparative examples.

[0105]

[0106]

[0107] As can be seen from the performance test data in Table 1, the compressive strength, wear resistance, and water permeability of the ecological water filter boards in Examples 1-3 and Comparative Examples 1-6 are comparable. However, the NOx reduction rate and toluene removal rate of the ecological water filter boards in Examples 1-3 are significantly higher, indicating that the air purification effect of the ecological water filter boards in Examples 1-3 is superior. Comparative Example 1 uses only nano-zinc oxide as a single-component purifier, Comparative Example 2 uses only nano-titanium dioxide as a single-component purifier, and Comparative Example 3 uses a zinc oxide-titanium dioxide nanocomposite purifier. Compared to using single-component purifiers, the air purification effect of the zinc oxide-titanium dioxide nanocomposite purifier is slightly improved. Comparative Example 4 uses a zinc oxide-graphene nanocomposite purifier, and Comparative Example 5 uses a titanium dioxide-graphene nanocomposite purifier. Compared to Comparative Examples 1 and 2, which only use single-component purifiers, the air purification effect of combining graphene only with zinc oxide or titanium dioxide is also slightly improved. However, the air purification effect is significantly improved by combining zinc oxide, titanium dioxide, and graphene.

[0108] Although the purifying agent in Comparative Example 6 included zinc oxide, titanium dioxide, and graphene, it was essentially a mixture of these three substances and not a composite. The purifying agents in Examples 1-3 were zinc oxide-titanium dioxide-graphene nanocomposite powders prepared by a specific method. Compared to the ecological water filter plate in Comparative Example 6, the ecological water filter plate in Example 1 showed an approximately 24% increase in NOx reduction and an approximately 13% increase in toluene removal, demonstrating a significant improvement in purification effect.

[0109] The applicant believes that the mechanism by which this application produces the above-mentioned technical effects is as follows:

[0110] Zinc oxide has a band gap of 3.37 eV, while titanium dioxide has a band gap of 3.0 eV–3.2 eV. Combining zinc oxide and titanium dioxide allows the wide-bandgap zinc oxide to promote photogenerated carriers in the narrow-bandgap titanium dioxide, suppressing electron-hole recombination and thus improving photocatalytic efficiency. Furthermore, combining them with graphene allows the conduction band levels of zinc oxide and titanium dioxide to be higher than the Fermi level of graphene. Photogenerated electrons can easily transfer from the semiconductor (zinc oxide and titanium dioxide) to the graphene through the interface formed between the semiconductor materials and graphene. The two-dimensional planar structure of graphene, composed of a giant conjugated system, can rapidly transfer photogenerated electrons to the target reactants with extremely high carrier migration rates. Simultaneously, it extends the mean free path of the photogenerated electrons, enabling them to participate in the formation of highly reactive free radicals (such as radical and peroxide radicals), non-selectively oxidizing and degrading organic pollutants, and photocatalytically sterilizing, thereby improving the efficiency of pollutant degradation.

[0111] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, all of which fall within the scope of protection of this application.

Claims

1. An environmentally friendly ecological water filter board that can purify air, characterized in that: The raw materials are mixed and then pressed together. The raw materials include: 300-380 parts by weight of aggregate, 50-70 parts by weight of polymer and resin modified cement-based composite adhesive, and 10-30 parts by weight of composite purifying agent. The composite purifying agent is a zinc oxide-titanium dioxide-graphene nanocomposite powder, which is prepared by the following method: (1) Dissolve zinc acetate and sodium carbonate in water, then add graphene powder, keep stirring for 2-3 hours, filter to obtain precipitate, wash the precipitate with water and dry it to obtain precursor, calcine the precursor at 500-600℃ for 1-2 hours to obtain zinc oxide-graphene nanocomposite powder. (2) Zinc oxide-graphene nanocomposite powder was mixed with anhydrous ethanol and glacial acetic acid, and then tetrabutyl titanate was added for hydrolysis. After being evaporated in a water bath, it was dried to obtain zinc oxide-titanium dioxide-graphene nanocomposite powder. (3) The zinc oxide-titanium dioxide-graphene nanocomposite powder was ball-milled; In step (1), the mass ratio of zinc acetate, sodium carbonate and graphene powder is 22:10 to 15:44; In step (2), the mass ratio of zinc oxide-graphene nanocomposite powder to tetrabutyl titanate is 30:6-9.

2. The environmentally friendly ecological water filter board for purifying air as described in claim 1, characterized in that: The aggregate is quartz sand with a particle size of 40-60 mesh.

3. The environmentally friendly ecological water filter board for purifying air as described in claim 1, characterized in that: The polymer and resin modified cement-based composite binder is composed of resin base material, cement-based material, and nano-grade pure acrylic emulsion in a weight ratio of 3-5:10-20:2-4; wherein: every 100 parts by weight of resin base material includes: 50-70 parts by weight of aspartic polyurea resin, 20-40 parts by weight of aliphatic isocyanate, and 5-10 parts by weight of elastomeric polyurea curing agent; every 100 parts by weight of cement-based material includes: 50-60 parts by weight of cement, 12-20 parts by weight of strength-enhancing expansion agent, 6-30 parts by weight of stone powder, 0-10 parts by weight of pigment, 1-2 parts by weight of dispersant, 1-2 parts by weight of defoamer, 1-2 parts by weight of water-retaining agent, and 1-3 parts by weight of setting regulator.

4. The environmentally friendly ecological water filter board for purifying air as described in claim 1, characterized in that: The raw materials include: 350-380 parts by weight of aggregate, 60-70 parts by weight of polymer and resin modified cement-based composite binder, and 16-24 parts by weight of composite purifying agent.

5. The method for preparing the environmentally friendly ecological water filter board as described in any one of claims 1 to 4, characterized in that, include: (1) Take aggregate, polymer and resin modified cement-based composite binder and composite purifying agent according to the weight parts, put them into a mixing pot and stir to mix, then add mixing water and continue stirring to obtain a mixture; (2) Spread the mixture evenly in the mold and compact it using static pressure. (3) After maintenance, an environmentally friendly ecological water filter board is obtained.

6. The method for preparing the environmentally friendly ecological water filter board as described in claim 5, characterized in that: The maintenance includes: first, placing it in a maintenance room at a temperature of 30℃~40℃ for 5~7 days, and then placing it outdoors at normal temperature for 14~28 days.

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