Photocatalytic composites containing titanium dioxides and suboxides for preventing green algae and method for preventing green algae using the same

Abstract

The present invention relates to a composite material for preventing algal blooms based on titanium dioxide (TiO2) and titanium suboxide (TinO2n-1, where n is an integer from 1 to 10) photocatalysts, and a method for preventing algal blooms using the same. The titanium dioxide and titanium suboxide composite material according to the present invention can semi-permanently suppress the growth of algal blooms by preventing biofilms or algae from attaching to the water tank using the photocatalytic phenomenon. The components of this composite material have relatively low toxicity and excellent biocompatibility, as well as the advantages of being harmless to the human body and environmentally friendly. Therefore, by attaching or applying a thin film or solution for preventing algal blooms containing the titanium dioxide and titanium suboxide photocatalyst composite material according to the present invention to the surface of a fish tank, the growth of algal blooms can be semi-permanently suppressed, and it is expected that there will be an effect of reducing long-term management costs and effort.

Description

Technology Field

[0001] The present invention relates to titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 (where n is an integer from 1 to 10) The invention relates to a photocatalyst-based composite material for preventing algal blooms and a method for preventing algal blooms using the same, and more specifically, to a composite material for preventing algal blooms using titanium dioxide and titanium suboxide photocatalysts that can prevent the generation of algal blooms occurring in underwater environments such as fish farms by utilizing a photocatalytic phenomenon, a thin film or solution for preventing algal blooms containing the same, and a method for preventing algal blooms using the thin film or solution. Background Technology

[0002] As the strategic importance of food resources increases, the sustainable development of aquaculture is essential, particularly for the stable supply of marine resources. Systematic water quality management and treatment technologies are required to reduce mortality rates during the large-scale cultivation of aquatic resources, such as fish or shellfish, in limited spaces. The accumulation of organic matter generated by various causes during the aquaculture process leads to algal blooms.

[0003] Generally, algal blooms are a representative phenomenon of water pollution, referring to the turning of water green due to the excessive proliferation of cyanobacteria present in a body of water. This primarily occurs when environmental factors, such as the excessive accumulation of nutrients like phosphorus and nitrogen, combine with rising temperatures and stagnant water bodies. Algal blooms refer to the phenomenon in which phytoplankton, specifically green algae or cyanobacteria, proliferate significantly in eutrophic lakes or slow-flowing rivers, causing the water to turn green. When green algae cover the surface of such water bodies, sunlight is blocked from reaching the water, and the influx of additional dissolved oxygen is prevented, leading to a decrease in the water's dissolved oxygen levels. Consequently, fish and aquatic life die, foul odors are emitted, and the ecosystem of the body is destroyed, resulting in numerous problems from social, economic, and environmental perspectives.

[0004] Although dissolved nutrients in the water, abnormal temperatures due to global warming, hydraulic factors, light penetration, changes in predator feeding, and the mass proliferation of microorganisms such as bacteria or viruses are cited as causes of algal blooms, algal blooms are not caused by a single factor but by the interaction of various factors as described above; therefore, the major factors of algal bloom occurrence manifest in unexpected ways depending on the physical and physicochemical characteristics of the water body.

[0005] Accordingly, various methods are being attempted to reduce algal blooms, but they mainly rely on physicochemical methods such as the application of loess and coagulants. In addition, various control methods, including photocatalysis, ultrasonic treatment, ozone treatment, and microbial methods, are being implemented individually or in combination.

[0006] However, most of the aforementioned conventional methods only provide temporary effects and suffer from the problem of being excessively expensive compared to their effectiveness. Furthermore, the chemical substances commonly used not only have an adverse ecological impact due to their toxicity, but the control methods, such as spraying, also directly pollute the water quality. Consequently, significant secondary environmental damage is actually occurring.

[0007] This project is the result of the Local Government-University Cooperation-based Regional Innovation Project, conducted in 2024 with funding from the Ministry of Education and support from the National Research Foundation of Korea. (2023RIS-009) The problem to be solved

[0009] The technical problem that the present invention aims to solve is to provide an environmentally friendly composite material for preventing algal blooms that has a low possibility of secondary underwater pollution.

[0010] Another technical problem to be solved by the present invention is to provide a thin film for preventing algae growth or a solution for preventing algae growth comprising the above-mentioned composite material.

[0011] Another technical problem to be solved by the present invention is to provide a method for semi-permanently preventing algal blooms using the aforementioned algal bloom prevention film or algal bloom prevention solution. means of solving the problem

[0012] In order to solve the above-mentioned technical problem, the present invention relates to titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 The present invention provides a composite material for preventing algae growth characterized by including a mixture of (where n is an integer from 1 to 10) as an active ingredient.

[0013] Preferably, the titanium suboxide is TiO, Ti2O3, It is characterized by being one or more selected from the group consisting of Ti3O5 and Ti4O7.

[0014] Preferably, the above-mentioned anti-algae composite material is characterized by comprising 10 to 90 weight% titanium dioxide and 10 to 90 weight% titanium suboxide.

[0015] Preferably, the above-mentioned anti-algae composite material may have a structure in which nano or micro-sized phases are randomly composited.

[0016] The above-mentioned anti-algae composite material may be in the form of a thin film or in the form of a solution in which powder is added to a solvent.

[0017] The present invention provides a thin film for preventing algae growth comprising the above-mentioned composite material for preventing algae growth.

[0018] The above-mentioned thin film for preventing algae growth can be manufactured by applying or vacuum-depositing a composite material for preventing algae growth onto a substrate. Specifically, the above-mentioned thin film for preventing algae growth can be manufactured by applying the composite material for preventing algae growth onto a substrate using a spin coating method that includes a heat treatment or drying process, or by vacuum-depositing it using a PVD (physical vapor deposition) or CVD (chemical vapor deposition) process.

[0019] The above-mentioned base material must be a flexible material that can be attached to a substrate of any shape, and may be, for example, plastic or coated paper.

[0020] In addition, the present invention provides a solution for preventing algae growth in which the above-mentioned composite material for preventing algae growth is added to a solvent.

[0021] Preferably, the above-mentioned solution for preventing algae is characterized by comprising 0.1 to 90 parts by weight of a composite material for preventing algae per 100 parts by weight of the total solution.

[0022] In addition, the present invention provides a method for preparing a solution for preventing algae growth, characterized by including the following steps:

[0023] (S1) Titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 A step of preparing a mixture by mixing (where n is an integer from 1 to 10);

[0024] (S2) A step of preparing a base coating solution by mixing a binder with a solvent; and

[0025] (S3) A step of adding the mixture prepared in step (S1) to the base coating solution prepared in step (S2) and then stirring to obtain an anti-algae solution.

[0026] The above solvent may be an organic solvent, an inorganic solvent including distilled water, or a mixture thereof.

[0027] The above binder may be one or more selected from the group consisting of synthetic thermosetting polymers, synthetic thermoplastics, and natural polymers.

[0028] Preferably, in step (S3), titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 , where n is an integer from 1 to 10) The mixture is characterized by being added in an amount of 0.1 to 90 parts by weight.

[0029] In order to solve the aforementioned additional technical problem, the present invention provides a method for preventing algae growth by using the above-mentioned solution for preventing algae growth or a thin film for preventing algae growth on a substrate.

[0030] Preferably, the above-mentioned anti-algae solution can be applied to a substrate, and the application can be performed by a spray coating, brush coating, or roller coating method.

[0031] The above substrate may be at least one of a fish farm tank, a water purification plant tank, a swimming pool, an aquarium, a water sports center and club facility, a ship, and a marine transport vehicle. Effects of the invention

[0032] As such, the titanium dioxide and sub-titanium oxide composite according to the present invention can semi-permanently suppress the growth of green algae by preventing biofilms or algae from attaching to the tank using a photocatalytic phenomenon. The components of this composite have relatively low toxicity and excellent biocompatibility, as well as the advantages of being harmless to the human body and environmentally friendly. Therefore, by attaching or applying a thin film or solution for preventing green algae containing the titanium dioxide and sub-titanium oxide photocatalyst-containing composite according to the present invention to the surface of aquaculture tanks, the growth of green algae can be semi-permanently suppressed, which is expected to have the effect of reducing long-term management costs and effort. Brief explanation of the drawing

[0033] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the aforementioned description; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. Figure 1 shows an example of a titanium dioxide and titanium suboxide composite dissolved in organic and inorganic solvents. Figure 2 shows an example of a thin film structure in which a solution for preventing algae growth according to the present invention is grown on a substrate. Figure 3 shows the degree of prevention of algal bloom formation over time (immediately after application, 4 days later, 12 days later, and 25 days later) of a composite thin film of titanium dioxide and titanium suboxide grown on a glass substrate. Specific details for implementing the invention

[0034] The present invention will be described in more detail below.

[0035] In the present invention, titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 The present invention provides a composite material for preventing algae growth characterized by including a mixture of (where n is an integer from 1 to 10) as an active ingredient.

[0036] The titanium dioxide (TiO2) used in this invention is an effective material for preventing or removing algal blooms, and it prevents biofilms or algae from attaching to water tanks through photocatalytic action primarily based on ultraviolet rays. A biofilm refers to the proliferation of algae, particularly cyanobacteria or green algae, attached to the walls or structures of aquaculture tanks. The growth of algae attached to underwater structures or marine transport vehicles is called algal attachment, which reduces the efficiency of aquaculture facilities and increases cleaning and maintenance costs over time.

[0037] Biofilms and algae promote the accumulation of organic matter in aquaculture farms, leading to the occurrence of algal blooms. Furthermore, as attached algae decompose, they alter water quality, creating an environment conducive to algal bloom growth. Therefore, biofilms and algal attachment can act as factors that directly or indirectly exacerbate the problem of algal blooms. Titanium dioxide, when absorbing light—particularly ultraviolet rays—generates electrons and holes, which react with water and oxygen to produce hydroxyl radicals (OH) and superoxide ions (O2), which are powerful oxidizing agents. -It produces ) reactive oxygen species. These reactive oxygen species oxidize and remove the cell walls and interiors of microorganisms, such as cyanobacteria, which are the main cause of algal blooms, or decompose organic matter to inhibit the growth of algal blooms.

[0038] In addition, titanium dioxide can prevent the formation of algae by oxidizing or reducing nutrients such as nitrogen (N) and phosphorus (P) in water, and surfaces coated with titanium dioxide are hydrophilic, preventing pollutants from adhering to the surface and providing a self-cleaning effect that inhibits algae formation.

[0039] The aforementioned titanium dioxide acts as a photocatalyst to absorb ultraviolet rays and generate reactive oxygen species, thereby decomposing and purifying water pollutants; this process is environmentally friendly as it does not produce toxic byproducts. In particular, titanium dioxide offers high safety as it is not absorbed through the skin even upon contact with the human body and does not have harmful effects on the body.

[0040] Titanium suboxide (Ti) used in the present invention n O 2n-1 (where n is an integer from 1 to 10) can decompose pollutants and organic matter in water and effectively remove microorganisms that cause algal blooms through visible light-based photocatalytic action. Due to its electronic structure containing oxygen vacancies, titanium suboxide absorbs not only ultraviolet and visible light but also some infrared light, thereby emitting reactive oxygen species (OH, O2 - It generates ). Reactive oxygen species have high oxidizing power and oxidize organic pollutants in water, breaking them down into harmless substances.

[0041] Sub-titanium oxide also inhibits the growth or eliminates microorganisms, such as cyanobacteria that cause algal blooms, by damaging their cell walls and internal structures through reactive oxygen species. This process is environmentally friendly as it effectively suppresses microbial proliferation without the use of separate chemicals. The high electron mobility and redox reaction characteristics of sub-titanium oxide enable the continuous and efficient maintenance of the algal bloom inhibition effect.

[0042] According to one embodiment of the present invention, the titanium suboxide is Ti n O 2n-1 (where n is an integer from 1 to 10), specifically, TiO, Ti2O3, It may be a compound having a structural formula such as Ti3O5, Ti4O7, and Ti5O9. In this case, the titanium oxide suboxide where n is 4 or greater is called the Magnelly phase.

[0043] The aforementioned "Magnelli phase" is a term related to specific structural and electronic properties of oxides, referring to a special phase that typically appears in non-stoichiometric (non-chemical ratio) oxide series of titanium oxide (TiO2) and related compounds. The Magnelli phase forms a unique arrangement within the crystal structure due to regular oxygen deficiency, thereby exhibiting distinctive physical and electronic properties; in this invention, its catalytic properties can be utilized in processes for pollutant removal or waste treatment.

[0044] According to a specific embodiment of the present invention, the titanium suboxide used in the present invention is TiO, TiO3, It is characterized by being one or more selected from the group consisting of Ti3O5 and Ti4O7, and more preferably TiO, Ti2O3 and A mixture of two or more selected from the group consisting of Ti3O5, e.g., TiO and Ti2O3; TiO and Ti3O5; and Ti2O3 and It can be used as a mixture of Ti3O5. In this case, the mixture of titanium suboxide can be mixed in a weight ratio of 1:3 to 3:1.

[0045] According to one embodiment of the present invention, the composite material for preventing algal blooms according to the present invention is characterized by comprising 10 to 90 weight% titanium dioxide and 10 to 90 weight% titanium suboxide. By using the mixture of titanium dioxide and titanium suboxide, light absorption over a wider wavelength range is possible, and the effect of partially controlling activity is achieved.

[0046] According to one embodiment of the present invention, the anti-algae composite material may have a structure in which nano or micro-sized phases are randomly composited.

[0047] The above-mentioned anti-algae composite material may be in the form of a thin film or in the form of a solution in which powder is added to a solvent.

[0048] The present invention provides a thin film for preventing algae growth comprising the above-mentioned composite material for preventing algae growth.

[0049] According to one embodiment of the present invention, the anti-algae film can be manufactured by applying or vacuum-depositing an anti-algae composite material onto a substrate. Specifically, the anti-algae film can be manufactured by applying the anti-algae composite material onto a substrate using a spin coating method including a heat treatment or drying process, or by vacuum-depositing it using a PVD (physical vapor deposition) or CVD (chemical vapor deposition) process.

[0050] According to the above PVD method, titanium and titanium oxide targets are vaporized at high temperature or plasma under vacuum conditions, and then the evaporated material is deposited onto a substrate to form a thin film. An oxidation reaction is induced by injecting a reaction gas into a reaction chamber, and a thin film of a mixed photocatalyst of titanium dioxide and sub-titanium oxide is formed on the surface of the substrate.

[0051] In addition, CVD is a method of depositing a mixture of titanium dioxide and titanium suboxide on a substrate surface through a chemical reaction by injecting an oxidizing agent into a reaction chamber with a gaseous titanium-based precursor, and can form a thin film by activating the reaction through heating the substrate to a high temperature.

[0052] At this stage, subsequent heat treatment can be performed to optimize characteristics. Afterward, the thin film is attached to the substrate.

[0053] The above-mentioned base material must be a flexible material that can be attached to a substrate of any shape, and may be, for example, plastic or coated paper.

[0054] According to one embodiment of the present invention, the formation of algae can be prevented by growing a thin film deposited on a substrate using the solution for preventing algae according to the present invention.

[0055] In addition, the present invention provides a solution for preventing algae growth in which the above-mentioned composite material for preventing algae growth is added to a solvent.

[0056] Meanwhile, the present invention provides a method for preparing a solution for preventing algae blooms, characterized by including the following steps:

[0057] (S1) Titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 A step of preparing a mixture by mixing (where n is an integer from 1 to 10);

[0058] (S2) A step of preparing a base coating solution by mixing a binder with a solvent; and

[0059] (S3) A step of adding the mixture prepared in step (S1) to the base coating solution prepared in step (S2) and then stirring to obtain an anti-algae solution.

[0060] According to one embodiment of the present invention, in step (S1), a mixture is prepared by mixing 10 to 90 weight% of titanium dioxide and 10 to 90 weight% of titanium suboxide.

[0061] According to one embodiment of the present invention, step (S2) is characterized by preparing a base coating solution by mixing a binder with a solvent.

[0062] According to one embodiment of the present invention, the solvent used in step (S2) is primarily used for dissolving or dispersing polymers, organic compounds, nanoparticles, etc., and plays an important role in the coating process. The organic solvent may be an organic solvent including ethanol, an inorganic solvent including distilled water, or a mixture thereof, but the present invention does not particularly limit such types.

[0063] According to one embodiment of the present invention, the binder may be one or more selected from the group consisting of synthetic thermosetting polymers, synthetic thermoplastics, and natural polymers. Synthetic thermosetting polymer-based binders include alkyd resins, acrylic resins, epoxy resins, and polyurethanes, etc. Synthetic thermoplastic polymers include polyvinyl alcohol (PVA), polyvinyl butyral (PVB), polyurethane (PU), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE, Teflon), etc.; natural polymer binders include cellulose (CMC, HPMC, etc.), gelatin, etc.

[0064] The above binder can be selected and used according to the required purpose, such as chemical compatibility with the thin film material, mechanical properties, thermal and chemical stability, thin film thickness and uniformity, and eco-friendliness, and the present invention does not particularly limit such types.

[0065] According to one embodiment of the present invention, the binder may be used in an amount of 1 to 90 parts by weight per 100 parts by weight of solvent.

[0066] According to one embodiment of the present invention, in step (S3), titanium dioxide (TiO2) and titanium suboxide (Ti) are mixed with respect to 100 parts by weight of the base coating solution. n O 2n-1 It is characterized by adding a mixture in an amount of 0.1 to 90 parts by weight.

[0067] The present invention provides a method for preventing algae growth by using the above-mentioned solution for preventing algae growth or a thin film for preventing algae growth on a substrate.

[0068] According to one embodiment of the present invention, the anti-algae solution can be applied to a substrate, and the application is characterized by being performed by a spray coating, brush coating, or roller coating method. The spray coating is a method of uniformly spraying the anti-algae solution onto a substrate using a sprayer, and the spray device moves in horizontal and vertical directions to apply the solution uniformly and rapidly over a large area.

[0069] The brush coating or roller coating described above involves applying a coating solution to a substrate using a brush or a roller, allowing for multiple applications while maintaining a consistent coating thickness.

[0070] The above substrate may be at least one of a fish farm tank, a water purification plant tank, a swimming pool, an aquarium, a water sports center and club facility, a ship, and a marine transport vehicle.

[0071] As such, the titanium dioxide and sub-titanium oxide composite according to the present invention can semi-permanently suppress the growth of green algae by preventing biofilms or algae from attaching to the tank using a photocatalytic phenomenon. The components of this composite have relatively low toxicity and excellent biocompatibility, as well as the advantages of being harmless to the human body and environmentally friendly. Therefore, by attaching or applying a thin film or solution for preventing green algae containing the titanium dioxide and sub-titanium oxide photocatalyst-containing composite according to the present invention to the surface of aquaculture tanks, the growth of green algae can be semi-permanently suppressed, which is expected to have the effect of reducing long-term management costs and effort.

[0073] Hereinafter, a photocatalytic composite material for preventing algal blooms according to one embodiment of the present invention will be described in detail based on examples. However, the following examples are merely illustrative to aid in understanding the present invention, and the scope of the present invention is not limited thereby.

[0075] <Example 1> Preparation of Algae Prevention Solution

[0076] A rust-prevention composite material was prepared by mixing titanium dioxide and titanium suboxide powder in a weight ratio of 8:2. At this time, TiO and Ti2O3 were mixed in a weight ratio of 1:1 and used as titanium suboxide.

[0077] A basic coating solution was prepared by adding 10 parts by weight of an acrylic resin binder to 100 parts by weight of distilled water.

[0078] A solution for preventing algae growth was prepared by adding 10 parts by weight of the mixture of titanium dioxide and titanium suboxide to 100 parts by weight of the above basic coating solution and stirring.

[0079] Figure 1 shows an example of a titanium dioxide and titanium suboxide composite dissolved in a solvent.

[0081] <Example 2> Preparation of a thin film for preventing algal blooms

[0082] A composite material containing titanium dioxide and titanium suboxide was fabricated into a thin film by growing it on a substrate using a physical vapor deposition (PVD) process. At this time, the ratio of titanium dioxide and titanium suboxide can be controlled by adjusting thin film growth conditions such as gas partial pressure, temperature, and plasma discharge conditions.

[0083] Figure 2 shows an example of a structure in which a solution for preventing algae growth according to the present invention is grown on a substrate.

[0085] <Test Example 1> Algae Growth Experiment

[0086] In October 2020, an algae growth experiment was conducted on a photocatalytic thin film in which the composite material for preventing algae according to the present invention was vacuum-deposited onto a substrate in an outdoor water tank environment.

[0087] A comparative experiment was conducted between cases where a composite thin film was grown on a glass slide and cases where no thin film was grown, using a DC magnetron sputtering method on a mixed thin film of titanium dioxide and sub-titanium oxide grown on a glass slide at room temperature (around 20℃) without replacing the seawater.

[0088] Figure 3 shows the degree of prevention of algal bloom formation over time (immediately after application, 4 days later, 12 days later, and 25 days later) of a composite thin film of titanium dioxide and sub-titanium oxide grown on a glass substrate. As can be seen here, compared to glass on which no separate thin film was grown, it was confirmed that almost no algal bloom occurred on the substrate on which the composite thin film of titanium dioxide and sub-titanium oxide was grown even after 25 days.

[0090] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Claims

Claim 1 Titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 A composite material for preventing algae growth characterized by including a mixture of (where n is an integer from 1 to 10) as an active ingredient. Claim 2 In claim 1, the titanium suboxide is TiO, Ti2O3, A composite material for preventing algal blooms characterized by being one or more selected from the group consisting of Ti3O5 and Ti4O7. Claim 3 A composite material for preventing algae growth according to claim 2, characterized in that the sub-titanium oxide is a mixture of TiO and Ti2O3; TiO and Ti3O5; and Ti2O3 and Ti3O5 mixed in a weight ratio of 1:3 to 3:

1. Claim 4 The algae prevention composite according to claim 1, characterized in that the algae prevention composite comprises 10 to 90 weight% titanium dioxide and 10 to 90 weight% titanium suboxide. Claim 5 A composite material for preventing algae growth according to claim 1, characterized in that the titanium dioxide and titanium suboxide are in powder form. Claim 6 The algae prevention composite according to claim 1, characterized in that the algae prevention composite is in the form of a thin film or in the form of a solution in which powder is added to a solvent. Claim 7 A thin film for preventing algal blooms comprising a composite material for preventing algal blooms according to any one of claims 1 to 6. Claim 8 In claim 7, the anti-algae film is characterized in that it is manufactured by applying an anti-algae composite material to a substrate or by vacuum deposition using a PVD (physical vapor deposition) or CVD (chemical vapor deposition) process. Claim 9 In claim 8, the anti-algae film is characterized in that the substrate is plastic or coated paper. Claim 10 An anti-algae solution in which an anti-algae composite material according to any one of claims 1 to 6 is added to a solvent. Claim 11 A solution for preventing algae growth according to claim 10, wherein the solvent is an organic solvent, an inorganic solvent including distilled water, or a mixture thereof. Claim 12 In claim 10, the solution for preventing algal blooms is characterized by comprising 0.1 to 90 parts by weight of a composite material for preventing algal blooms per 100 parts by weight of the total solution. Claim 13 A method for preparing a solution for preventing algal blooms characterized by comprising the following steps: (S1) titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 (S2) a step of preparing a mixture by mixing a binder in a solvent, wherein n is an integer from 1 to 10; and (S3) a step of obtaining an anti-algae solution by adding the mixture prepared in step (S1) to the base coating solution prepared in step (S2) and then stirring. Claim 14 A method for preparing an anti-algae solution according to claim 13, characterized by mixing 10 to 90 weight% of titanium dioxide and 10 to 90 weight% of titanium suboxide in step (S1). Claim 15 In claim 13, the titanium suboxide is TiO, Ti2O3, A method for preparing a solution for preventing algal blooms, characterized by having one or more selected from the group consisting of Ti3O5 and Ti4O7. Claim 16 In claim 15, the titanium suboxide is TiO and Ti2O3; TiO and Ti3O5; and Ti2O3 and A method for preparing a solution for preventing algae growth, characterized by being a mixture in which Ti3O5 is mixed in a weight ratio of 1:3 to 3:

1. Claim 17 A method for preparing an anti-algae solution according to claim 13, characterized in that the solvent in step (S2) is an organic solvent, distilled water, or a mixture thereof. Claim 18 A method for preparing an anti-algae solution according to claim 13, wherein in step (S2), the binder is one or more selected from the group consisting of synthetic thermosetting polymers, synthetic thermoplastics, and natural polymers. Claim 19 In claim 13, with respect to 100 parts by weight of the base coating solution in step (S3), titanium dioxide (TiO2) and titanium suboxide (Ti n O 2n-1 A method for preparing a solution for preventing algae growth, characterized by adding a mixture (where n is an integer from 1 to 10) in an amount of 0.1 to 90 parts by weight. Claim 20 A method of preventing algae growth by attaching a thin film for preventing greening according to claim 7 to a substrate, or by applying a solution for preventing algae growth according to claim 10. Claim 21 A method for preventing algae growth according to claim 20, characterized in that the application is performed by a spray coating, brush coating, or roller coating method. Claim 22 A method for preventing algal blooms according to claim 20, wherein the substrate is at least one of a fish farm tank, a water purification plant tank, a swimming pool, an aquarium, a water sports center and club facility, a ship, and a marine transport vehicle.

Images