Photocatalytic component and purification treatment apparatus

Abstract

The utility model provides a kind of photocatalytic component and purification treatment equipment, photocatalytic component has at least one photocatalytic component, each photocatalytic component has metal core body, layer structure body of oxide of same metal and photocatalytic material, therefore can realize photocatalytic function, and because layer structure body distributes multiple fine holes, therefore when metal oxide itself has photocatalytic activity, the surface area of metal oxide can be increased by fine hole, so as to expand the area of exerting photocatalytic function;When photocatalytic material is coated on layer structure body, because photocatalyst is also arranged in multiple fine holes, not only the amount and surface area of photocatalyst can be increased, but also photocatalyst distribution can be relatively more uniform, so as to improve photocatalytic effect, obtain better purification treatment performance.And, photocatalyst formed in fine hole is difficult to peel off due to anchoring effect etc., can increase the adhesion of photocatalyst, so that it is more difficult to peel off.

Description

Technical Field

[0001] This utility model belongs to the field of photocatalysis technology, specifically relating to a photocatalytic component and purification equipment. Background Technology

[0002] Photocatalysis is a technology that uses light energy to drive chemical reactions, achieving various effects such as antibacterial, antiviral, antifogging, anti-fogging, deodorization, air purification, and water purification. In recent years, photocatalytic products have been increasingly used in daily life, especially photocatalytic filters used to purify air or water. Currently, there is a strong demand for such photocatalytic filters.

[0003] While some photocatalytic filters exist on the market, these filters still suffer from problems such as insufficient photocatalytic function and significant decline in photocatalytic performance after long-term use. For example, Japanese patent application JP2010058004A discloses a photocatalytic filter (screen) comprising a metal woven fabric made of fine metal wires and a photocatalyst layer composited on the metal woven fabric. Although this photocatalytic filter can achieve photocatalytic function, it is difficult to attach a sufficient amount of photocatalyst to the metal woven fabric, thus preventing the filter from fully realizing its photocatalytic function. Furthermore, since the photocatalyst layer is only attached to the metal woven fabric, its anti-peeling performance is insufficient. Once the photocatalyst layer peels off or falls off, the filter will experience problems such as decreased photocatalytic performance and uneven purification effect, thus failing to meet practical application requirements. Utility Model Content

[0004] This invention is made to solve the above-mentioned problems, and its purpose is to provide a photocatalytic component with better photocatalytic effect and less prone to photocatalytic stripping, as well as a purification treatment device using this photocatalytic component. The technical solution adopted by this invention is as follows:

[0005] This invention provides a photocatalytic component, which has the following technical features: the photocatalytic component includes at least one photocatalytic member, each of the photocatalytic members including: a core made of metal; a layer structure formed of an oxide of the metal and covering the core; and a photocatalyst covering the layer structure, wherein the layer structure has a plurality of micropores distributed thereon.

[0006] The photocatalytic component provided by this utility model may also have the following technical features, wherein the micropores are a composite pore structure, comprising: a main pore portion, which is a strip-shaped pore; and multiple secondary pore portions, which are distributed on the side wall surface and bottom surface of the main pore portion and are respectively connected to the main pore portion.

[0007] The photocatalytic component provided by this utility model may also have the following technical feature: the photocatalytic component further includes a passivation layer, which is composed of an oxide of the metal that is insoluble in acidic solutions, and covers the surface of the core.

[0008] The photocatalytic component provided by this utility model may also have the following technical features: the photocatalytic component is in the shape of a fine thread, and multiple photocatalytic components intersect each other to form a woven fabric or non-woven fabric.

[0009] The photocatalytic component provided by this utility model may also have the following technical feature: the wire diameter of the photocatalytic component is 1μm to 5mm.

[0010] The photocatalytic component provided by this utility model may also have the following technical feature: the photocatalytic component is in the form of a thin plate.

[0011] The photocatalytic component provided by this utility model may also have the following technical feature: the metal is aluminum, titanium, tungsten, copper, vanadium, niobium or their alloys or stainless steel.

[0012] The photocatalytic component provided by this utility model may also have the following technical features, wherein the surface of the layered structure includes the inner wall surface of a plurality of the fine pores, and the photocatalyst is layered and covers the surface of the layered structure.

[0013] The photocatalytic component provided by this utility model may also have the following technical feature: the photocatalyst covers the surface of the layered structure and fills the pores.

[0014] The photocatalytic component provided by this utility model may also have the following technical features: the metal is titanium, and the layered structure and the photocatalyst are integrally formed and are titanium dioxide.

[0015] The photocatalytic component provided by this utility model may also have the following technical feature: the average pore size of the micropores is 5nm to 1000nm.

[0016] The photocatalytic component provided by this utility model may also have the following technical feature: the average pore size of the micropores is 20nm to 500nm.

[0017] The photocatalytic component provided by this utility model may also have the following technical feature: the relative standard deviation of the pore size distribution of the fine pores is less than or equal to 40%.

[0018] The photocatalytic component provided by this utility model may also have the following technical feature: the relative standard deviation of the pore size distribution of the fine pores is less than or equal to 20%.

[0019] The photocatalytic component provided by this utility model may also have the following technical feature: the porosity of the pores is 10% to 90%.

[0020] The photocatalytic component provided by this utility model may also have the following technical feature: the light absorption rate of the photocatalytic component is 5% to 100%.

[0021] The photocatalytic component provided by this utility model may also have the following technical feature: the thickness of the layer structure is 40nm to 1000nm.

[0022] This utility model provides a purification treatment device, which has the following technical features: the device includes a photocatalytic component as described in any of the above.

[0023] The purification equipment provided by this utility model may also have the following technical feature: the equipment further includes a light source for irradiating the photocatalytic component to induce a photocatalytic reaction.

[0024] The purification equipment provided by this utility model may also have the following technical features: there are multiple photocatalytic components, and the light source is arranged among the multiple photocatalytic components.

[0025] <Function and Effects of Utility Models>

[0026] According to the photocatalytic component and purification equipment provided by this utility model, since the photocatalytic component has at least one photocatalytic element, each photocatalytic element has a metal core, a layered structure composed of oxides of the same metal, and a photocatalyst covering the layered structure, it can achieve photocatalytic function. Furthermore, since the layered structure has multiple pores, when the metal oxide itself has photocatalytic activity, the pores can increase the surface area of ​​the metal oxide, thereby expanding the area where the photocatalytic function is exerted, thus achieving better purification performance. When a photocatalyst is formed by coating the layered structure, since the photocatalyst is also placed within multiple pores, not only can the amount and surface area of ​​the photocatalyst be increased, but the distribution of the photocatalyst can also be made relatively more uniform, thereby improving the photocatalytic effect and achieving better purification performance. Moreover, the photocatalyst formed within the pores is difficult to peel off due to anchoring effects, which increases the adhesion of the photocatalyst, making it less prone to peeling, thus inhibiting the reduction of photocatalytic ability during long-term use. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the photocatalytic component in Embodiment 1 of this utility model;

[0028] Figure 2 yes Figure 1Enlarged structural diagram of the inner part of the middle frame A;

[0029] Figure 3 This is a scanning electron microscope image of the metal oxide surface in Embodiment 1 of this utility model;

[0030] Figure 4 This is a schematic diagram of the air purification equipment in Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the liquid purification and treatment equipment in Embodiment 1 of this utility model;

[0032] Figure 6 This is a schematic diagram of the configuration of the light source in the purification treatment device in Embodiment 1 of this utility model;

[0033] Figure 7 This is a performance comparison chart of the photocatalytic filter in Embodiment 1 of this utility model with products from other companies;

[0034] Figure 8 This is a schematic diagram of the concentration change during the photocatalytic decomposition treatment of bisphenol A in Embodiment 1 of this utility model;

[0035] Figure 9 This is a schematic diagram of the air purification equipment in Embodiment 2 of this utility model;

[0036] Figure 10 This is a schematic diagram of the configuration of the light source in the purification treatment device in Embodiment 2 of this utility model;

[0037] Figure 11 This is a schematic diagram of the photocatalytic component in Embodiment 3 of this utility model;

[0038] Figure 12 This is a schematic diagram of the photocatalytic component in Embodiment 4 of this utility model;

[0039] Figure 13 This is a schematic diagram of the photocatalytic component in Embodiment 5 of this utility model;

[0040] Figure 14 This is a schematic diagram of the photocatalytic component in Embodiment Six of this utility model.

[0041] Figure label:

[0042] Purification device 1000; photocatalytic component 100; photocatalytic element 10; core 11; layer structure 12; barrier layer 121; protrusion 122; micropore 123; main pore 1231; secondary pore 1232; photocatalyst 13; micropore 131; passivation layer 14; light source 200; fan 300; channel 400. Detailed Implementation

[0043] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the photocatalytic component and purification equipment of this utility model will be specifically described below in conjunction with the embodiments and accompanying drawings.

[0044] Example 1

[0045] <Composition of photocatalytic components>

[0046] Figure 1 This is a schematic diagram of the photocatalytic component in this embodiment.

[0047] like Figure 1 As shown, the photocatalytic component 100 of this embodiment includes one or more photocatalytic members 10, which are in the form of fine threads. When it includes multiple photocatalytic members 10, these photocatalytic members 10 can be arranged regularly or irregularly. Preferably, the multiple fine thread-shaped photocatalytic members 10 interweave to form a woven fabric or non-woven fabric. The woven fabric form refers to the form in which the multiple photocatalytic members 10 are woven together, which can also be called a mesh; the non-woven fabric form refers to the multiple photocatalytic members 10 not being woven into a structure. More preferably, the multiple fine thread-shaped photocatalytic members 10 form a woven fabric.

[0048] Figure 2 yes Figure 1 Enlarged structural diagram of the inner part of the middle frame A.

[0049] like Figure 2 As shown, each photocatalytic component 10 includes a core 11, a layered structure 12, and a photocatalyst 13.

[0050] The core 11 is in the form of a thin wire and is made of metal. The metal material can be selected as needed, such as aluminum, titanium, tungsten, iron, niobium, tantalum, vanadium, magnesium, copper, alloys of these metals, and stainless steel. Aluminum, titanium, tungsten, copper, vanadium, niobium, or their alloys or stainless steel are particularly preferred, and aluminum, titanium, and tungsten are even more preferred. These materials have advantages in terms of manufacturing, availability, and cost of photocatalytic components. The wire diameter of the core 11 can be selected as needed, preferably from 1 μm to 5 mm.

[0051] A layered structure 12 covers the core 11 and is composed of an oxide of the same metal as the core 11. The layered structure 12 includes a barrier layer 121 and protrusions 122 protruding outward from one surface of the barrier layer 121. The protrusions 122 are thin layers with a porous structure. A plurality of fine pores 123 are distributed in the protrusions 122.

[0052] The barrier layer 121 is layered and covers the outer surface of the core 11. The barrier layer 121 has an uneven shape, and multiple recesses are formed on the surface of the core 11 that contacts the barrier layer 121.

[0053] Each micro-hole 123 is a long, straight hole, such as a roughly long, cylindrical hole, with one end being the bottom and the other end being an opening. The bottom of the hole can be arc-shaped or concave arc-shaped. In addition, the shape of the micro-hole 123 can also be crater-shaped, etc. In this embodiment, the bottom of the micro-hole 123 is concave arc-shaped.

[0054] In this embodiment, the layer structure 12 has a plurality of regular pores 123. "Regular" specifically means that the pore size distribution of the plurality of pores 123 is relatively uniform. Specifically, the relative standard deviation of the pore size distribution of the plurality of pores 123 is less than 40%, more preferably less than 20%, and even more preferably less than 10%. In this case, the pores are more uniform, and thus the photocatalyst can be formed more uniformly.

[0055] The thickness of the layer structure 12 is not particularly limited, but is preferably 40 nm to 1000 nm. In this case, the depth of the fine pores 123 can be increased. The depth of the fine pores 123 can be selected as needed, for example, 300 nm, 700 nm, etc. The aperture ratio of the layer structure 12 is not particularly limited, but is preferably 20% to 80%.

[0056] The average pore size (also referred to as average micropore diameter) of the plurality of micropores 123 is preferably 5 nm to 2000 nm, more preferably 5 nm to 1000 nm, and even more preferably 20 nm to 500 nm. The circumferential center-to-center spacing (period) of the plurality of micropores 123 in the photocatalytic component 10 is approximately 100 nm. The porosity of the micropores 123 is not particularly limited, but is preferably 10% to 90%.

[0057] In the aforementioned dimensions, the porosity of the photocatalytic component 100 can be determined by acquiring images using an electron microscope (SEM image). Alternatively, it can be calculated using the wire diameter and fill rate of the metal wire, or by the true density and apparent density. Similarly, the aperture ratio of the layered structure 12 can be measured by acquiring SEM images and using image analysis software. It should be noted that the aperture ratio of the layered structure 12 should be measured before the photocatalyst 13 is formed.

[0058] Photocatalyst 13 covers the layered structure 12 and has photocatalytic activity. Under the irradiation of a corresponding light source, it can achieve functions such as antibacterial, antiviral, antifouling, anti-fogging, deodorization, air purification and water purification.

[0059] The specific location of the photocatalyst 13 can be selected as needed. For example, the photocatalyst 13 can be layered and formed along the surface of the layered structure 12 with multiple pores 123, that is, covering the inner wall of the multiple pores 123 and filling part or all of the space inside the pores 123; or, the photocatalyst 13 can also be blocky and located at the bottom inside the multiple pores 123; or, the photocatalyst 13 can also be a combination of layered and blocky forms, that is, covering the surface of the layered structure 12 and filling each pore 123.

[0060] In this embodiment, the photocatalyst 13 is in the form of a combination of layered and blocky structures as described above. The photocatalyst 13 covers the outer surface of the layer structure 12 and fills each fine pore 123, essentially filling each fine pore 123.

[0061] The type of photocatalyst 13 is not particularly limited, and can be, for example, titanium dioxide, tungsten trioxide, zinc oxide, iron oxide, vanadium oxide, etc. Among them, titanium dioxide is preferred. In order to obtain a large specific surface area and good reactivity, the particle size of the photocatalyst should be small. For example, for titanium dioxide, the particle size range is 1 nm to 1000 nm, and more preferably 2 nm to 100 nm.

[0062] There is no particular limitation on the thickness of the photocatalyst 13, but it is preferably 1 nm to 500 nm. From the perspective of improving the function of the photocatalyst, a thickness of 10 nm or more is more ideal. From the perspective of maintaining a similar microporous structure after the photocatalyst is formed, a thickness of less than 200 nm is more ideal. Therefore, the thickness of the photocatalyst 13 is more preferably 10 nm to 200 nm.

[0063] There is no particular limitation on the absorbance of the photocatalytic component 100, but it is preferably between 5% and 100%. The absorbance of the photocatalytic component is an indicator of how well the photocatalyst absorbs light and performs its function, and it can be measured by transmission spectroscopy. When the absorbance is above 5%, it can be considered that the photocatalyst has absorbed a portion of the light and performed its function; when the absorbance is 100%, it can be considered that the photocatalyst has absorbed all the light and performed its function. The closer the absorbance is to 100%, the higher the function of the photocatalyst.

[0064] The photocatalytic component 100 can be prepared by: preparing a metal braid made of fine metal wires; anodizing the metal braid to form a layered structure 12 (metal oxide layer) and a core 11 (metal core) with multiple pores 123; then coating the layered structure 12 with a photocatalyst; and finally heating and curing the photocatalyst to form a photocatalyst 13. The anodizing process can utilize existing self-organizing conditions to form pores 123 with high regularity and good straightness.

[0065] Figure 3 This is a scanning electron microscope image of the metal oxide surface in this embodiment.

[0066] like Figure 3 As shown, using the self-organizing anodizing conditions in the prior art, a metal oxide layer with a highly regular porous structure can be formed.

[0067] The mesh count, wire diameter, and wire spacing of the metal wires can be selected as needed, and the finished product's mesh count, wire diameter, and wire spacing will correspond to the corresponding data of the metal wires. In this embodiment, the photocatalytic component 100 has a mesh count of 100, a wire diameter of approximately 0.1 mm, and a wire spacing of approximately 0.15 mm. Alternatively, a mesh count of 150, a wire diameter of 0.07 mm, and a wire spacing of 0.1 mm can also be used.

[0068] The application of the photocatalytic component 100 is not particularly limited and can be selected as needed. For example, it can be used for the purification of gases or liquids. The gas can be, for example, air, and the liquid can be, for example, water. That is, the photocatalytic component 100 can be used as a photocatalytic component for air or water purification, for example, it can be used as a filter for air treatment or a filter for water treatment.

[0069] In addition, it can also be used as a filter, or for the decomposition of organic matter.

[0070] In addition, it can also be used against bacteria and viruses.

[0071] In addition, it can also be used to extend the freshness and shelf life of fruits. For example, this effect can be achieved by placing fruit and photocatalytic component 100 in a container, allowing ethylene gas to decompose into the photocatalytic component 100.

[0072] The photocatalytic component 100 of this embodiment is very suitable for use in devices for purifying gases or liquids, such as air purifiers, water purifiers, or windows equipped with the photocatalytic component 100, etc.

[0073] Composition of purification equipment

[0074] Figure 4 This is a schematic diagram of the air purification equipment in this embodiment.

[0075] like Figure 4 As shown, exemplarily, the purification device is an air purification device, which includes a photocatalytic component 100, a light source 200 and a fan 300 disposed in the housing, and a channel 400 for airflow is also formed in the housing.

[0076] In this example, the photocatalytic component 100 is a filter screen, roughly rectangular in shape, and vertically mounted in the device. Multiple light sources 200 are positioned on one side of the photocatalytic component 100 to irradiate it. The fan 300 is an example of a flow path generation method for generating gas or liquid flow paths, used to blow gas toward the photocatalytic component 100. As shown by the arrows in the figure, under the action of the fan 300, the polluted air 91 before treatment flows toward the photocatalytic component 100, and after being treated by the photocatalytic component 100, it forms purified air 92 which flows out through the channel 400. In this way, gases such as air can be treated and purified.

[0077] The above example is a purification device 1000 for air purification, but the application of the photocatalytic component 100 is not limited to this; it can also be used in liquid purification devices. For example, the fan 300 described above can be replaced with a spiral mechanism for generating liquid (e.g., water) flow, allowing the liquid to flow in the channel 400. Furthermore, the configuration, quantity, and type of the light source 200 can be selected as needed. The light source 200 can be configured downstream of the photocatalytic component 100, upstream of it (in the direction of fluid flow), or simultaneously downstream and upstream of the photocatalytic component 100.

[0078] Figure 5 This is a schematic diagram of the liquid purification treatment equipment in this embodiment.

[0079] like Figure 5 As shown, exemplarily, the purification treatment device 1000 can also be a liquid purification treatment device, which also includes a photocatalytic component 100 and a light source 200 disposed within a housing, and a channel 400 formed within the housing. The photocatalytic component 100 is a mesh formed by multiple photocatalytic members 10 intersecting each other, with multiple through-holes formed between the photocatalytic members 10, and the channel 400 is also formed through these through-holes.

[0080] In this example, the photocatalytic component 100 is a filter screen, its overall shape matching the shape of the channel 400, and it is horizontally arranged in the device. Multiple light sources 200 are positioned below the photocatalytic component 100 and irradiate it. Wastewater 93 before treatment flows in from directly above the photocatalytic component 100, and after being treated by the photocatalytic component 100, purified water 94 flows out from directly below the photocatalytic component 100. In this way, liquids such as water can be treated and purified.

[0081] Similarly, in this example, the configuration, quantity, and type of the light source 200 can be selected as needed. The light source 200 can be configured on the downstream side, upstream side (in the direction of fluid flow) of the photocatalytic component 100, or simultaneously on the downstream side and upstream side of the photocatalytic component 100.

[0082] Figure 6 This is a schematic diagram of the configuration of the photocatalytic component and light source in the purification equipment of this embodiment.

[0083] like Figure 6 As shown in (a), multiple light sources 200 can be arranged on the same side of the photocatalytic component 100 to irradiate one side of the photocatalytic component 100. Figure 5 As shown in (b), multiple light sources 200 can also be respectively arranged on both sides of the photocatalytic component 100, and simultaneously irradiate both sides of the photocatalytic component 100.

[0084] Furthermore, in the purification treatment equipment, the photocatalytic component 100 and a support component for supporting the photocatalytic component 100 can be used together. The support component can be, for example, a stirring component for stirring a gas or liquid, on which the photocatalytic component 100 is mounted to stir the gas or liquid for purification treatment.

[0085] <Gas Purification Performance Evaluation>

[0086] The photocatalytic component 100 in this embodiment is processed to have an area of ​​approximately 120 cm². 2 The filter is installed in an air purification device (air purifier) ​​that has a light source and a fan. The structure of the air purifier is as follows: Figure 3 As shown in the figure. The light source was an ultraviolet LED lamp with a center wavelength of 365 nm and a light intensity of 20 mW / cm². The fan airflow was set to 100 L / min, and acetaldehyde (General-Reagent) was used as the pollutant. The acetaldehyde concentration and the CO₂ generated by the photocatalytic reaction were measured using a photoacoustic gas detector (Gasera-One). The photocatalytic decomposition reaction was carried out according to the above method.

[0087] Test results show that after purification by the photocatalytic component 100, the initial concentration of acetaldehyde (30 ppm) decreased to 0.5 ppm after 17 minutes. This result indicates that, compared to conventional commercially available filters (with photocatalysts loaded on titanium mesh), the filter of the photocatalytic component 100 in this embodiment exhibits approximately twice the reaction rate and demonstrates excellent purification characteristics.

[0088] Figure 7This is a performance comparison chart of the photocatalytic filter in this embodiment with products from other companies. "Developed product" refers to the photocatalytic filter manufactured using the method of this embodiment, and other company products include filter products from companies A to D. The test conditions were as follows: acetaldehyde was used as the test sample in a 1m³ sealed container, with an initial concentration of 5ppm. The acetaldehyde was purified using both the photocatalytic filter of this embodiment and filters from companies A to D. Performance comparisons were conducted under the same test conditions and referenced press releases published by a Japanese research institution with general incorporated association status on April 27, 2022.

[0089] like Figure 7 As shown, the photocatalytic filter of this embodiment (labeled "development product" in the figure) reduces the acetaldehyde concentration to 0 ppm within 5 minutes. Among other companies' products, Company B's product has the best performance, while the photocatalytic filter of this embodiment exhibits a higher reaction rate than Company B's product. This result demonstrates that the photocatalytic filter prepared by the method of this embodiment has excellent performance.

[0090] <Liquid Purification Performance Evaluation>

[0091] The photocatalytic component 100 of this embodiment is processed into an area of ​​approximately 120 cm². 2 The filter screen is installed in a liquid purification treatment device, which is a closed container (flowing tank) with a light source, a quartz window, and a pump to circulate the liquid. The photocatalytic filter screen is installed within this closed container. The light source is an ultraviolet LED lamp with a center wavelength of 365nm and a light intensity of 20mW / cm². 2 The filter was irradiated with this light source to remove contaminants from the solution. Using methylene blue as the contaminant, the reaction rate of the photocatalyst was evaluated under conditions of 500 mL solution volume and 100 mL / min flow rate. The results showed that for an initial concentration of 20 ppm, the concentration decreased to 0.2 ppm after 10 minutes.

[0092] Therefore, the photocatalytic component 100 in this embodiment also has good purification characteristics for liquids.

[0093] Furthermore, the photocatalytic component 100 was prepared according to the above method and processed into a shape with an area of ​​approximately 120 cm². 2 The filter screen was installed at the bottom of the sealed container, and a decomposition test was conducted using bisphenol A (produced by Innochem), a recalcitrant organic pollutant.

[0094] Figure 8 This is a schematic diagram showing the concentration change during the photocatalytic decomposition of bisphenol A in this embodiment.

[0095] like Figure 8As shown, under the conditions of an initial concentration of 10 ppm, a solution volume of 100 mL, and a flow rate of 100 mL / min, 50% of the pollutants were decomposed and removed within 20 minutes.

[0096] Therefore, the photocatalytic component 100 of this embodiment also has good purification characteristics for solutions containing recalcitrant organic matter.

[0097] <Peel Strength Assessment>

[0098] In this embodiment, the photocatalyst 13 was anchored through multiple fine pores 123, which improved the adhesion of the photocatalyst layer. The peel strength of the photocatalyst was tested in the following manner.

[0099] The comparison sample was an aluminum woven fabric coated with a photocatalyst layer, which did not have the fine porous structure of this embodiment. The aluminum woven fabric of this embodiment and the comparison sample were subjected to peel strength tests using adhesive tape (JMWeston J66228), and the results are shown in Table 1 below.

[0100] Table 1. Peel strength test data for different aluminum braided fabrics

[0101]

[0102] As shown in Table 1, for the aluminum woven fabric of this embodiment, the peeling rate was 0%, meaning no photocatalyst peeling was detected. In contrast, the peeling rate for the control sample was 38.0%, indicating that a significant proportion of the photocatalyst was peeled off. This result demonstrates that the fine-porous structure improves the adhesion of the photocatalyst.

[0103] <Function and Effect of Example 1>

[0104] According to the photocatalytic component and purification equipment provided in this embodiment, the photocatalytic component has at least one photocatalytic element, each of which has a metal core, a layered structure composed of oxides of the same metal, and a photocatalyst covering the layered structure, or the layered structure itself has photocatalytic activity and can act as a photocatalyst. Therefore, it can achieve photocatalytic function. Furthermore, since the layered structure has multiple pores, when the metal oxide itself has photocatalytic activity, the pores can increase the surface area of ​​the metal oxide, thereby expanding the area where the photocatalytic function can be performed, thus achieving better purification performance. When a photocatalyst is formed by coating the layered structure, since the photocatalyst is also placed within multiple pores, not only can the amount and surface area of ​​the photocatalyst be increased, but the distribution of the photocatalyst can also be made relatively more uniform, thereby improving the photocatalytic effect and achieving better purification performance. Moreover, the photocatalyst formed within the pores is difficult to peel off due to anchoring effects, which increases the adhesion of the photocatalyst, making it less prone to peeling, thus suppressing the decrease in photocatalytic ability during long-term use.

[0105] In the embodiments, the photocatalyst is filled in multiple pores and substantially fills the pores, thereby increasing the amount of photocatalyst, increasing the surface area of ​​the photocatalyst, and enhancing the anchoring effect, further improving the adhesion stability of the photocatalyst and increasing its anti-peeling strength.

[0106] Furthermore, the porosity of the micropores is between 10% and 90%. When the porosity is above 10%, it facilitates the passage of water or air, making it easier for the target material (water or air) to contact the photocatalyst, thereby improving the photocatalytic effect. When the porosity is below 90%, it can suppress the reduction of the photocatalyst unit quantity in the photocatalytic component, thus avoiding a decrease in photocatalytic activity. In addition, when the porosity is within the above range, it can also ensure the amount of light irradiating the photocatalyst.

[0107] Furthermore, the thickness of the layered structure (metal oxide layer) is between 40 nm and 1000 nm, which can increase the depth of the pores, thereby increasing the amount of photocatalyst formed in the pores and improving the photocatalytic effect.

[0108] In this embodiment, since multiple fine metal filaments are woven into a metal woven fabric, and a photocatalytic component is processed on this basis, a photocatalytic filter can be easily formed, making it particularly suitable for use in air purifiers and liquid purifiers to purify air or water. Furthermore, such a photocatalytic filter can be easily further processed into the desired shape; for example, it can be processed into a structure that matches the channel of the purification equipment. The positional relationship between the photocatalytic filter and the light source can also be easily adjusted as needed, thus offering high flexibility in its installation.

[0109] Example 2

[0110] This embodiment provides a photocatalytic component and a purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0111] The difference between this embodiment and Example 1 is that the configuration of the purification equipment is different.

[0112] Composition of purification equipment

[0113] Figure 9 This is a schematic diagram of the purification equipment in this embodiment.

[0114] like Figure 9 As shown, the purification equipment is an air purification device (air purifier), which includes two photocatalytic components 100 (photocatalytic filters), multiple light sources 200, and a fan. Both photocatalytic filters are vertically arranged and stacked along the direction of airflow, with a certain distance between them. The multiple light sources 200 are located on the same side of the two photocatalytic filters and irradiate them.

[0115] The air purification device of this embodiment was tested and evaluated for photocatalytic reaction under the same ultraviolet light irradiation and airflow conditions as in Example 1, and the testing method was the same as in Example 1. After testing, using the air purification device of Example 1 (a single photocatalytic filter), the concentration dropped to 10% after 43 minutes. However, using the air purification device of this embodiment (two stacked photocatalytic filters), the concentration dropped to 10% after 19 minutes. Therefore, compared to using a single photocatalytic filter, the air purification speed in this embodiment, using two stacked photocatalytic filters, is increased by 2.3 times.

[0116] Furthermore, the same test evaluation was also conducted on the use of three stacked photocatalytic filters. When using three stacked photocatalytic filters, the concentration dropped to 10% after 17 minutes. Therefore, compared to using one photocatalytic filter, using three photocatalytic filters increased the air purification speed by 2.5 times.

[0117] In addition, a liquid purification device using two stacked photocatalytic filters was also tested. Specifically, two photocatalytic filters were stacked along the liquid flow direction within a sealed container containing a light source and a liquid pump, and the same tests as in Example 1 were performed. The tests showed that for an initial concentration of 50 ppm, using the liquid purification device of Example 1 (single photocatalytic filter), the concentration decreased to 27% after 10 minutes and to 4% after 20 minutes. However, using the liquid purification device of this example (two stacked photocatalytic filters), the concentration decreased to 9% after 10 minutes and to 0% after 20 minutes. Therefore, compared to using a single photocatalytic filter, the liquid purification speed was improved by using two stacked photocatalytic filters in this example.

[0118] Figure 10 This is a schematic diagram of the configuration of the light source in the purification device in this embodiment.

[0119] like Figure 10 As shown in (a), when the device is provided with multiple photocatalytic components 100 stacked along the fluid flow direction, multiple light sources 200 can be arranged on the same side of all photocatalytic components 100, irradiating the side facing the photocatalytic component 100. Figure 10 As shown in (b), when multiple photocatalytic components 100 are stacked, preferably, a light source 200 can be provided between adjacent photocatalytic components 100 in order to reduce the area of ​​the multiple photocatalytic components 100 that is not illuminated by light and improve the processing capacity.

[0120] <Example 2: Function and Effect>

[0121] Based on the photocatalytic component and purification equipment provided in this embodiment, and building upon the effects of Embodiment 1, the purification equipment significantly enhances purification capacity due to the presence of multiple photocatalytic components stacked along the fluid flow direction. Furthermore, the light source in the purification equipment can be positioned between the multiple photocatalytic components to reduce the area of ​​the components not exposed to light, further improving purification capacity.

[0122] Example 3

[0123] This embodiment provides a photocatalytic component and a purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0124] The difference between this embodiment and Example 1 is that the structure of the photocatalytic component is different.

[0125] <Composition of photocatalytic components>

[0126] Figure 11This is a cross-sectional view of the photocatalytic component in this embodiment, with the photocatalyst omitted from the figure.

[0127] like Figure 11 As shown, the photocatalytic component 100 of this embodiment also includes a very thin passivation layer 14 formed between the core 11 and the layer structure 12. The passivation layer 14 is a chromate passivation film, which can be formed, for example, by removing the anodic oxide with a solution containing chromic acid after the first anodizing, and then forming the layer structure 12 by a second anodizing.

[0128] In this embodiment, the other structures are basically the same as in Embodiment 1.

[0129] <Function and Effect of Example 3>

[0130] Based on the photocatalytic component and purification equipment provided in this embodiment, and in addition to the effects of Embodiment 1, the presence of a passivation layer prevents the substrate metal from being excessively dissolved during the preparation process, thus ensuring the strength of the metal woven fabric.

[0131] Example 4

[0132] This embodiment provides a photocatalytic component and a purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0133] The difference between this embodiment and Example 1 is that the structure of the photocatalytic component is different.

[0134] <Composition of photocatalytic components>

[0135] Figure 12 This is a cross-sectional view of the photocatalytic component in this embodiment. The figure mainly shows the structure of the layered structure, omitting the core and photocatalyst.

[0136] like Figure 12As shown, in this embodiment, the fine hole 123 is a composite hole, each fine hole 123 including a main hole portion 1231 and multiple secondary hole portions 1232. The main hole portion 1231 is approximately a cylindrical hole with a rounded bottom, and its extension direction is the direction of the centerline of the fine hole 123. The multiple secondary hole portions 1232 are also approximately cylindrical holes with rounded bottoms, but their diameter and depth are much smaller than the diameter and depth of the main hole portion 1231. Each secondary hole portion 1232 communicates with the main hole portion 1231, and the opening of the secondary hole portion 1232 is located on the sidewall or bottom surface of the main hole portion 1231. The extension direction of the secondary hole portion 1232 is approximately perpendicular to the surface direction of the sidewall or bottom surface portion of the main hole portion 1231 at its location. The multiple secondary hole portions 1232 are relatively evenly distributed along the sidewall and bottom surface of the main hole portion 1231. The surface area of ​​the micropores 123 and the bonding strength with the photocatalyst 13 can be further increased by using multiple secondary pores 1232. Such a composite pore structure can be obtained, for example, by changing the voltage of the anodizing process.

[0137] In this embodiment, the other structures are basically the same as in Embodiment 1.

[0138] <Function and Effect of Example 4>

[0139] Based on the photocatalytic component and purification equipment provided in this embodiment, and building upon the effects of Embodiment 1, the micropores have a composite pore structure, thus enabling a larger surface area. Furthermore, the composite pore structure allows for better fixation of the photocatalyst, further preventing its stripping.

[0140] Example 5

[0141] This embodiment provides a photocatalytic component and a purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0142] The difference between this embodiment and Example 1 is that the structure of the photocatalytic component is different.

[0143] <Composition of photocatalytic components>

[0144] Figure 13 This is a cross-sectional view of the photocatalytic component in this embodiment.

[0145] like Figure 13As shown, the photocatalytic component 10 also includes a core 11, a layered structure 12 having multiple regular pores 123, and a photocatalyst 13. However, the photocatalyst 13 is in the form of a thin layer, covering the outer surface of the layered structure 12 and the inner wall of the multiple pores 123, but not filling the entire pore 123. That is, the photocatalyst 13 still retains the porous structure, and the photocatalyst 13 also has multiple pores 131. Such a thin layer of photocatalyst 13 can be formed by, for example, atomic layer deposition (ALD) methods.

[0146] In this embodiment, the other structures are basically the same as in Embodiment 1.

[0147] <Function and Effect of Example 5>

[0148] Based on the photocatalytic component and purification equipment provided in this embodiment, and building upon the effects of Embodiment 1, since the photocatalyst layer is formed along the surface of the layer structure and the inner wall of each pore, it still maintains a porous structure after the photocatalyst is coated. Water or air can come into contact with the photocatalyst formed inside the pores, thus increasing the surface area of ​​the photocatalyst and thereby improving the efficiency of the photocatalyst.

[0149] Example 6

[0150] This embodiment provides a photocatalytic component and a purification device. In this embodiment, the same symbols are used for the same components as in Embodiment 1, and the corresponding descriptions are omitted.

[0151] The difference between this embodiment and Example 1 is that the structure of the photocatalytic component is different.

[0152] <Composition of photocatalytic components>

[0153] Figure 14 This is a cross-sectional view of the photocatalytic component in this embodiment.

[0154] like Figure 14 As shown, the photocatalytic component 10 includes a core 11 and a layered structure 12 with multiple regular fine pores 123. Its shape is basically the same as that in Example 1. That is, compared with Example 1, the photocatalytic component 100 in this embodiment does not have a photocatalyst 13.

[0155] The layered structure 12 itself has photocatalytic activity, so there is no need to form an additional photocatalyst layer. In this embodiment, the core 11 is titanium, and the layered structure 12 is titanium dioxide with photocatalytic activity.

[0156] In the photocatalytic component 100 of this embodiment, the average pore size of the micropores 123 is about 1.1 μm, and the light absorption rate of the photocatalytic component 100 is 100%.

[0157] <Purification Performance Evaluation>

[0158] The photocatalytic component 100 of this embodiment (i.e., a photocatalytic filter without photocatalyst coating) was tested for pollutant decomposition under the same test conditions as in Example 1. The results showed that 10% of acetaldehyde was decomposed and removed within 1 hour. Therefore, the photocatalytic filter obtained by the method of this embodiment exhibits photocatalytic activity even without photocatalyst coating. In this photocatalytic filter, the metal oxide layer with multiple pores is an anodic oxide film, and the metal oxide layer is a titanium dioxide layer, which possesses photocatalytic function.

[0159] Furthermore, based on the photocatalytic component 100 of this embodiment, a photocatalyst was further coated onto the layered structure 12 using the same method as in Example 1, and then heated and cured to form a photocatalytic filter coated with the photocatalyst. The photocatalytic filter was then tested for pollutant decomposition under the same test conditions as in Example 1. The results showed that 94% of the acetaldehyde was decomposed and removed within 1 hour.

[0160] <Function and Effect of Example Six>

[0161] According to the photocatalytic component and purification equipment provided in this embodiment, since the substrate is composed of titanium metal wires, the corresponding metal oxide layer (titanium dioxide layer) itself has photocatalytic activity. Therefore, there is no need for a photocatalyst formation process, which has the advantages of reducing costs and processes. In addition, since the titanium dioxide layer has multiple pores, it has a larger surface area and can achieve better photocatalytic efficiency.

[0162] The above embodiments are merely illustrative of specific implementations of this utility model, and the utility model is not limited to the scope of the above embodiments. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only for illustrating the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A photocatalytic component, characterized in that, Includes at least one photocatalytic component, Each of the photocatalytic components includes: The core is made of metal; A layered structure formed of an oxide of the metal and covering the core; and Photocatalysts, covering the layer structure, The layered structure has multiple fine pores.

2. The photocatalytic component according to claim 1, Its features are: The micropores are composite pore structures, comprising: The main hole is a strip-shaped hole; and Multiple secondary holes are distributed on the sidewalls and bottom surfaces of the main hole and are connected to the main hole respectively.

3. The photocatalytic component according to claim 1, characterized in that, Also includes: A passivation layer, consisting of an oxide of the metal that is insoluble in acidic solutions, covers the surface of the core.

4. The photocatalytic component according to claim 1, characterized in that: in, The photocatalytic component is in the shape of a thin thread. Multiple photocatalytic components are interwoven to form a woven or nonwoven fabric.

5. The photocatalytic component according to claim 4, characterized in that: in, The diameter of the photocatalytic component is 1 μm to 5 mm.

6. The photocatalytic component according to claim 1, characterized in that: in, The photocatalytic component is in the form of a thin plate.

7. The photocatalytic component according to claim 1, characterized in that: in, The metal is aluminum, titanium, tungsten, copper, vanadium, niobium or an alloy thereof, or stainless steel.

8. The photocatalytic component according to claim 1, characterized in that: in, The surface of the layered structure includes the inner wall surfaces of a plurality of the fine pores. The photocatalyst is layered and covers the surface of the layered structure.

9. The photocatalytic component according to claim 1, characterized in that: in, The photocatalyst covers the surface of the layered structure and fills the pores.

10. The photocatalytic component according to claim 1, characterized in that: in, The metal is titanium. The layered structure and the photocatalyst are integrally formed and are titanium dioxide.

11. The photocatalytic component according to any one of claims 1-10, characterized in that: in, The average pore size of the micropores is 5 nm to 1000 nm.

12. The photocatalytic component according to claim 11, characterized in that: in, The average pore size of the micropores is 20 nm to 500 nm.

13. The photocatalytic component according to any one of claims 1-10, characterized in that: in, The relative standard deviation of the pore size distribution is less than or equal to 40%.

14. The photocatalytic component according to claim 13, characterized in that: in, The relative standard deviation of the pore size distribution is less than or equal to 20%.

15. The photocatalytic component according to any one of claims 1-10, characterized in that: in, The porosity of the micropores is 10% to 90%.

16. The photocatalytic component according to any one of claims 1-10, characterized in that: in, The light absorption rate of the photocatalytic component is 5% to 100%.

17. The photocatalytic component according to any one of claims 1-10, characterized in that: in, The thickness of the layer structure is 40 nm to 1000 nm.

18. A purification treatment device for purifying gases or liquids, characterized in that, It includes a photocatalytic component, wherein the photocatalytic component is the photocatalytic component according to any one of claims 1-17.

19. The purification treatment equipment according to claim 18, characterized in that, Also includes: A light source is used to irradiate the photocatalytic component to induce a photocatalytic reaction.

20. The purification treatment equipment according to claim 19, characterized in that: in, The photocatalytic components are multiple. The light source is disposed among the plurality of photocatalytic components.

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