Preparation method of photocatalytic sewage purification material with moss-resistant surface

Abstract

The invention relates to a preparation method of a surface moss-resistant photocatalytic sewage purification material, which comprises the following steps: dissolving cement, photocatalyst powder and a moss-resistant precursor in ultrapure water, completely stirring to obtain uniform cement slurry, coating a substrate material with the uniform cement slurry, and curing and drying to obtain the surface moss-resistant cement photocatalytic material. The photocatalytic material prepared by the preparation method disclosed by the invention gives consideration to reduction or inhibition of moss growth on the surface, load stability and catalytic activity, has good mechanical properties and corrosion resistance, can improve the photocatalytic performance of the photocatalytic material by utilizing a catalyst to the maximum extent, is excellent in maintenance economy, and meets the practical requirements of photocatalytic purification of polluted water.

Description

Technical Field

[0001] The invention relates to the technical field of environmental treatment, in particular to a method for preparing a photocatalytic sewage purification material with an anti-moss surface. Background Art

[0002] Photocatalytic nets suspended on the water surface, made from photocatalytic nanoparticles such as TiO2, can catalytically decompose organic pollutants in water under light conditions to purify the water. However, existing photocatalytic nets are mostly based on organic polymer materials, which are easily decomposed, rotted, and damaged in water. During the actual treatment of polluted water, moss gradually adheres to the surface and grows, blocking light, resulting in a decrease in the net's catalytic performance. Furthermore, the proliferation of moss in polluted water is harmful, consuming inorganic salts and leaving the water thin. The decomposition of dead moss produces toxic substances that harm aquatic life. The decay of moss causes the water to turn black and smelly, resulting in excessive ammonia nitrogen levels and low dissolved oxygen levels. Therefore, it is necessary to reduce or inhibit the adsorption and growth of moss on the surface of the photocatalytic net, increase the effective illumination area, and maximize the application range of the photocatalytic net to improve the efficiency of treating black and smelly water. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for preparing a photocatalytic sewage purification material with a surface resistant to moss, which can take into account the photocatalytic network load stability, catalytic activity, and surface resistant to moss, and meet the needs of photocatalytically polluted water treatment.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The preparation method of the surface anti-moss photocatalytic sewage purification material comprises the following steps:

[0006] Step 1: at a temperature of 1°C to 20°C, 0.5 to 3.0 parts of a catalyst, 10 parts of cement, 5 to 30 parts of water, and 0.03 to 0.10 parts of an anti-moss precursor are mixed according to a mass ratio and stirred thoroughly to obtain a uniform mixed slurry; the catalyst is TiO2, CeO2, or WO3 nanoparticles, and the anti-moss precursor is Cu2O or Cu(OH)2;

[0007] Step 2: Prepare a base material for carrying the mixed slurry, and use a spraying device to evenly spray the mixed slurry onto the fully moistened surface of the base material to a coating thickness of 0.03 to 3 mm to form a photocatalytic plate; after demoulding the photocatalytic plate, move it into a humid environment;

[0008] Step 3: Keep the photocatalytic plate in a moist state for 3 to 30 days and then air-dry it for 3 to 7 days. After air-drying, the photocatalytic material can be obtained by cutting or carving.

[0009] In step 1 of the above method, the catalyst is TiO2, CeO2 or WO3 nanoparticles with a particle size of 10 to 500 nm.

[0010] In step 2 of the above method, the base material is non-woven fabric or coconut shell cloth; the physical reinforcement material is cement with a strength of 32.5, and the bottom surface of the base material is bonded to the physical reinforcement material.

[0011] In step 2 of the above method, the base material is a cement board, and the mixed slurry is bonded to the surface of the cement board by an adhesive.

[0012] In step 2 of the above method, a scraper is used instead of the spraying equipment. First, the mold for forming a fixed shape is placed on the fully wetted base material, the mixed slurry is poured in, and the mixed slurry is evenly coated on the surface of the base material with a scraper.

[0013] In step three of the above method, when the ambient temperature is between 1°C and 20°C, the photocatalytic plate is kept moist by sprinkling, spraying, misting or air humidification; when the ambient temperature is above 20°C, the photocatalytic plate is kept moist by covering it with plastic wrap.

[0014] The present invention also provides an application of a photocatalytic sewage purification material with a moss-resistant surface for purifying water in a fish tank or a pond, and the material is prepared by the above method.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention prepares cement photocatalytic materials by mixing catalyst powder, cement, and anti-moss precursor. When treating slightly polluted water bodies, the surface of the photocatalytic material can resist moss while fully exposing the catalyst under sufficient light exposure, taking into account both load stability and catalytic activity. It has good chemical stability, strong binding ability, good processability, low cost, and long service life, meeting the practical requirements of photocatalysis.

[0017] 2. The preparation method of the present invention is simple, has mild conditions, low cost, and a wide range of adjustable mold sizes and shapes. It is economically feasible and suitable for large-scale promotion and application.

[0018] 3. The photocatalytic material of the present invention has a stable structure, is not easily damaged and loses effectiveness, is easy to recycle, has good reusability, and has a long service life, which can effectively improve the efficiency of the photocatalytic material in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the process in which the color of the anti-moss photocatalytic material prepared by the present invention gradually turns blue during the molding process;

[0020] Figure 2This is a photo of the photocatalytic material prepared by the present invention with different proportions of Cu2O doping;

[0021] Figure 3 is the degradation ratio of methyl orange by the photocatalytic material prepared by the present invention under simulated sunlight for 24 hours;

[0022] Figure 4 The anti-moss effect of photocatalytic materials with different proportions of Cu2O doping incubated in a moss solution with a lower concentration;

[0023] Figure 5 It is the anti-moss effect of photocatalytic materials with different proportions of Cu2O doping incubated in a higher concentration of moss solution.

[0024] Figure 6 This is a comparison chart of the photocatalytic material prepared by the present invention used in fish tanks to eliminate green algae and purify water quality; wherein a is without using the material of the present invention, and b is with using the material of the present invention.

[0025] Figure 7 This is a comparison chart of the photocatalytic material prepared by the present invention used in fish tanks to eliminate pollutants and purify water quality; the left picture is without using the material of the present invention, and the middle and right pictures are using the material of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] refer to Figures 1 to 5 The present invention provides a method for preparing a surface-resistant moss cement photocatalytic material, comprising stirring catalyst powder, cement, and water to obtain a uniform cement slurry, adding an anti-moss precursor, and stirring thoroughly to obtain a uniform cement slurry, placing a mold on a cloth with good water absorption, pouring the slurry, and flattening the surface with a scraper, demolding the mold, and moving the mold into a humid environment. The moist cement photocatalytic material is cured and then naturally air-dried to form a surface-resistant moss cement photocatalytic material. The obtained surface-resistant moss photocatalytic material is further spliced ​​to obtain a large-area photocatalytic mesh array of any shape for laying in a micro-polluted water treatment application environment. The specific steps are described as follows:

[0028] Step 1: Mix 0.5-3.0 parts of a catalyst, 10 parts of cement, 5-30 parts of water, and 0.03-0.10 parts of an anti-moss precursor in a mass ratio at room temperature, a biochemical incubator, or a freezer in winter at a temperature of 1-20°C, and stir thoroughly with a magnetic stirrer to obtain a uniform mixed slurry; the water is ultrapure water; the catalyst is a stable material with photocatalytic properties, such as nano-sized TiO2, CeO2, or WO3 particles, with a particle size of 10-500 nm, preferably titanium dioxide P25 nanoparticles; the anti-moss precursor is a water-insoluble stable material with a moss growth inhibitory effect, preferably Cu2O or Cu(OH)2;

[0029] Step 2: Using a porous fabric as a base material, with a physical reinforcement material attached to the bottom surface, the mixed slurry is evenly applied to the base material surface to initially obtain a pre-defined photocatalytic material. The mixed slurry can be applied to the base material by coating or spraying. Depending on the coating method, the coating thickness generally ranges from 0.03 to 3 mm. The photocatalytic material is then cut to obtain various sizes.

[0030] The base material is a material with good mechanical properties and good adhesion to cement, preferably a flexible porous fabric. Preferably, non-woven fabrics and coconut shell fabrics with good water absorption and a flat surface are used. The base material can be flat or have a certain spatial curved surface. Place the shape mold on the fully moistened cloth, pour in the slurry and use a scraper to flatten the surface, and move it into a humid environment after demoulding; the pre-treatment method is to apply a physical reinforcement material on the back of the contact surface between the porous cloth and the mixed slurry. The physical reinforcement material is a material with good mechanical properties and good adhesion to the base material, preferably cement with a strength of 32.5. If the base material is a rigid material, the pre-treatment method is to apply a surface adhesive on the contact surface between it and the mixed slurry.

[0031] Step 3: Under specific conditions, the photocatalytic material obtained in step 2 is cured and fully reacted, and gradually dried to obtain a photocatalytic material with an anti-moss surface. The curing method for the shaped photocatalytic material can be selected from sprinkling, spraying, atomizing, or air humidification. One of the methods of spraying with a washing bottle or humidifying is used. Ultrapure water is sprayed on the photocatalytic material three times a day, with 5 mL of ultrapure water sprayed each time. The curing time is 3 to 30 days, and then naturally air-dried for 3 to 5 days. This forms a cement photocatalytic material with an anti-moss surface. Under the combined action of the catalyst, cement, and water, the metal ions in the anti-moss precursor react with the alkaline substances in the cement to generate a substance that inhibits moss growth. The reaction time is the same as the curing time.

[0032] The specific environment can be one of two conditions: (1) the ambient temperature is between 1 and 20°C, which can be natural temperature or in an incubator or refrigerator. (2) preferably, the surface of the pre-moistened photocatalytic material is covered with plastic wrap to achieve a reaction temperature above 20°C. These two conditions ensure maintenance and sufficient reaction, so that the surface of the photocatalytic material acquires anti-moss properties.

[0033] After sufficient reaction, the material can be further cut or carved to obtain various shapes of suitable photocatalytic materials. The shape of the surface-resistant moss photocatalytic material can be flexibly customized through cutting and carving, and multiple materials can be spliced ​​into various patterns. The material is highly stable in water and suitable for treating various types of slightly polluted water bodies. The resulting surface-resistant moss photocatalytic material can be spliced ​​together to obtain large-area photocatalytic mesh arrays of any shape for use in micro-polluted water treatment applications.

[0034] Example 1:

[0035] Step 1: At 20°C, weigh 0.6g of titanium dioxide P25 and 3g of cement in a mass ratio of catalyst powder: cement: water of 2:10:10, add 3mL of water, and stir thoroughly with a magnetic stirrer to obtain a uniform cement slurry;

[0036] Step 2: Weigh 0.24 g of cuprous oxide based on 8% by mass of white cement and pour it into a uniform cement slurry, stirring thoroughly to obtain a uniform cement slurry;

[0037] Step 3: Place the mold on the wet non-woven fabric, pour the slurry into it and use a scraper to smooth the surface. Adhere 32.5 grade white cement to the bottom. After demoulding, move it to a humid environment with a room temperature of about 14°C in winter.

[0038] Step 4: Curing the wet cement photocatalytic material, use a bottle filled with ultrapure water to spray the photocatalytic material three times a day, 5mL of ultrapure water each time, curing for seven days, the anti-moss photocatalytic material slowly turns blue (see Figure 1 ), and dried naturally for seven days to obtain the anti-moss photocatalytic material (see Figure 2 ), forming cement photocatalytic materials with different surface resistance to moss.

[0039] Example 2:

[0040] Step 1: At 20°C, weigh 0.6g of titanium dioxide P25 and 3g of cement in a mass ratio of catalyst powder: cement: water of 2:10:10, add 3mL of water and stir thoroughly to obtain a uniform cement slurry;

[0041] Step 2: Weigh 0.15 g of cuprous oxide based on 5% by mass of white cement and pour it into a uniform cement slurry, stirring thoroughly to obtain a uniform cement slurry;

[0042] Step 3: Place the mold on a moistened non-woven fabric, pour the slurry into the mold, and use a scraper to smooth the surface. Glue 32.5 grade white cement to the bottom. After demolding, move the mold into a biochemical incubator set to 14°C in advance.

[0043] Step 4: Curing the wet cement photocatalytic material. Use a washing bottle filled with ultrapure water to spray the photocatalytic material three times a day, 5 mL of ultrapure water each time, curing for seven days, and naturally air-drying for seven days to form cement photocatalytic materials with different surface resistance to moss.

[0044] Furthermore, the resulting photocatalytic material was placed in moss-containing solutions of varying concentrations and observed for a period of time to effectively prevent moss growth on its surface. The resulting surface-resistant moss photocatalytic material can be spliced ​​together to create a large-area photocatalytic mesh array in any shape for use in micro-polluted water treatment applications.

[0045] Example 3:

[0046] Step 1: At 20°C, weigh 0.6g of titanium dioxide P25 and 3g of cement in a mass ratio of catalyst powder: cement: water of 2:10:10, add 3mL of water and stir thoroughly to obtain a uniform cement slurry;

[0047] Step 2: Weigh 0.24 g of cuprous oxide based on 8% by mass of white cement and pour it into a uniform cement slurry, stirring thoroughly to obtain a uniform cement slurry;

[0048] Step 3: Place the mold on the moistened coconut shell cloth, pour in the slurry and use a scraper to smooth the surface. Glue 32.5 grade white cement to the bottom. After demoulding, move it into a freezer set at 15°C in advance.

[0049] Step 4: Curing the moistened cement photocatalytic material using a humidifier for seven days and air-drying it for seven days to form cement photocatalytic materials with different surface resistance to moss.

[0050] Example 4:

[0051] Step 1: At a temperature of 1°C, weigh 0.15g of titanium dioxide P25 and 3g of cement in a mass ratio of catalyst powder: cement: water of 0.5:10:5, add 1.5mL of water and stir thoroughly to obtain a uniform cement slurry;

[0052] Step 2: Weigh 0.09 g of cuprous oxide based on 3% by mass of white cement and pour it into a uniform cement slurry, stirring thoroughly to obtain a uniform cement slurry;

[0053] Step 3: Place the mold on the moistened coconut shell cloth, pour in the slurry and use a scraper to smooth the surface. Glue 32.5 grade white cement to the bottom. After demoulding, move it into a freezer set at 15°C in advance.

[0054] Step 4: Curing the moistened cement photocatalytic material using a humidifier for 3 days and air-drying for 3 days to form cement photocatalytic materials with different surface anti-moss properties.

[0055] Example 5:

[0056] Step 1: At a temperature of 10°C, weigh 0.9g of titanium dioxide P25 and 3g of cement in a mass ratio of catalyst powder: cement: water of 3:10:30, add 9mL of water and stir thoroughly to obtain a uniform cement slurry;

[0057] Step 2: Weigh 0.3 g of cuprous oxide according to a mass percentage of 10% of white cement and pour it into a uniform cement slurry, stirring thoroughly to obtain a uniform cement slurry;

[0058] Step 3: Place the mold on a moistened coconut shell cloth, pour in the slurry and smooth the surface with a scraper. Apply 32.5 grade white cement to the bottom. After demoulding, move the mold into a freezer set at 20°C in advance.

[0059] Step 4: Curing the moistened cement photocatalytic material using a humidifier for 30 days and air-drying for seven days to form cement photocatalytic materials with different surface resistance to moss.

[0060] refer to Figure 3 The above examples successfully fabricated a moss-resistant cement photocatalytic material on non-woven fabric or coconut shell cloth. The photocatalytic material effectively degraded methyl orange under simulated sunlight. The photocatalytic material, containing 10% cuprous oxide by weight of white cement, achieved near 100% degradation efficiency for methyl orange.

[0061] refer to Figure 4 and Figure 5 After a week of observation in moss water with lower and higher concentrations, it was found that the surface of the photocatalytic material can effectively inhibit the growth of moss.

[0062] refer to Figure 6 The module prepared by the present invention is used in the fish tank to eliminate green algae and purify the water quality. It can be seen from the comparison that: a is turbid water without using the module of the present invention, and moss is obviously present in the water; b is relatively clear when the material of the present invention is used, and the green algae in the water are significantly less than a, and the aquatic plants and ornamental fish in the water are more clearly visible.

[0063] refer to Figure 7 The photocatalytic material prepared by the present invention is used in fish tanks to eliminate pollutants. It can be seen from the comparison of the water purification effects that the middle and right pictures use the material of the present invention. The water is colorless, clear and transparent, and the water pollution is significantly less than that in the left picture. The aquatic plants and ornamental fish in the water are more clearly visible.

[0064] The photocatalytic material manufactured by the present invention takes into account the reduction or inhibition of moss growth on the surface, load stability and catalytic activity, has good mechanical properties and corrosion resistance, can maximize the use of catalysts, has excellent maintenance economy, and meets the practical requirements of photocatalysis for micro-polluted water bodies.

[0065] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for preparing a surface-resistant moss photocatalytic sewage purification material, characterized in that: The steps include: Step 1: at a temperature of 1°C to 20°C, 0.5 to 3.0 parts of a catalyst, 10 parts of cement, 5 to 30 parts of water, and 0.03 to 0.10 parts of an anti-moss precursor are mixed according to a mass ratio and stirred thoroughly to obtain a uniform mixed slurry; the catalyst is TiO2, CeO2, or WO3 nanoparticles, and the anti-moss precursor is Cu2O or Cu(OH)2; Step 2: Prepare a base material for carrying the mixed slurry, and use a spraying device to evenly spray the mixed slurry onto the fully moistened surface of the base material to a coating thickness of 0.03 to 3 mm to form a photocatalytic plate; after demoulding the photocatalytic plate, move it into a humid environment; Step 3: Keep the photocatalytic plate in a moist state for 3 to 30 days and then air-dry it for 3 to 7 days. After air-drying, the photocatalytic material can be obtained by cutting or carving.

2. The method for preparing the surface anti-moss photocatalytic sewage purification material according to claim 1, characterized in that: In step 1, the catalyst is TiO2, CeO2 or WO3 nanoparticles with a particle size of 10 to 500 nm.

3. The method for preparing the surface anti-moss photocatalytic sewage purification material according to claim 1, characterized in that: In step 2, the base material is non-woven fabric or coconut shell cloth; the physical reinforcement material is cement with a strength of 32.5, and the bottom surface of the base material is bonded to the physical reinforcement material.

4. The method for preparing the surface anti-moss photocatalytic sewage purification material according to claim 1, characterized in that: In step 2, the base material is a cement board, and the mixed slurry is bonded to the surface of the cement board by an adhesive.

5. The method for preparing the surface anti-moss photocatalytic sewage purification material according to claim 1, characterized in that: In step 2, a scraper is used instead of the spraying equipment. First, the mold for forming a fixed shape is placed on the fully wetted base material, the mixed slurry is poured in, and the mixed slurry is evenly coated on the surface of the base material with a scraper.

6. The method for preparing the surface anti-moss photocatalytic sewage purification material according to claim 1, characterized in that: In step three, when the ambient temperature is between 1°C and 20°C, the photocatalytic plate is kept moist by sprinkling, spraying, misting or air humidification; when the ambient temperature is above 20°C, the photocatalytic plate is kept moist by covering it with plastic wrap.

7. Application of a photocatalytic sewage purification material with anti-moss surface for purifying water in fish tanks or ponds, characterized in that: A material prepared by the method for preparing a surface anti-moss photocatalytic sewage purification material according to any one of claims 1 to 6.

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