Simple method for rapidly synthesizing transparent solution-shaped titanium dioxide at near room temperature

Abstract

The invention provides a simple synthesis method of colloidal titanium dioxide, and belongs to the technical field of nanometer material synthesis. The invention aims to solve the technical problems of complex preparation process, high cost and poor dispersibility of the traditional titanium dioxide. According to the method, titanium tetrachloride is adopted as a raw material, a simplified and ingenious hydrolysis reaction process is utilized, colloidal titanium dioxide which is rich in surface hydroxyl and extremely small in particle size is prepared, and the titanium dioxide colloid is in a transparent solution shape and has excellent photocatalytic capacity. The core of the technical scheme is to control hydrolysis conditions so as to quickly synthesize high-dispersity transparent solution-shaped titanium dioxide at low cost, and meanwhile, the obtained product is ensured to have excellent self-cleaning and antibacterial properties. Due to the simple and convenient preparation method and excellent performance, the titanium dioxide is suitable for being used as a coating additive and a surface antibacterial coating of objects such as ceramic, glass and plastic products, and has obvious practical value and wide market prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of nanomaterial synthesis, in particular to a method for synthesizing colloidal titanium dioxide, aiming to provide an economical and efficient method for preparing titanium dioxide with high dispersibility and excellent photocatalytic performance. Background Art

[0002] Titanium dioxide, a white solid or powdered amphoteric oxide, boasts excellent whiteness, strong tinting power, strong hiding power, non-toxicity, and chemical stability. It is widely used in coatings, plastics, rubber, and food industries. Its high refractive index effectively protects coatings from erosion and damage by moisture, oxygen, and ultraviolet light. Titanium dioxide has a high specific surface area and strong physical adsorption capacity, effectively adsorbing and immobilizing microorganisms on surfaces, thereby killing them and demonstrating excellent antibacterial properties.

[0003] Titanium dioxide is widely used in environmental purification, self-cleaning surface coatings, and solar cells due to its excellent photocatalytic properties, chemical stability, and non-toxicity. As a photocatalyst, titanium dioxide generates electron-hole pairs under light, stimulating the activity of photogenerated electrons. This stimulates surrounding molecules to receive light energy and become excited, triggering a series of chain reactions that ultimately lead to the photocatalytic degradation of organic matter and bacteria.

[0004] Despite this, traditional titanium dioxide synthesis methods often involve complex process steps and high costs. Traditional titanium dioxide synthesis usually requires high temperatures above 500 degrees Celsius, which limits its widespread promotion in industrial and commercial applications. Therefore, developing a simple and low-cost titanium dioxide synthesis method has become a research focus in this field. Summary of the Invention

[0005] In order to overcome the many technical defects existing in the existing technology, especially the high cost, complex operation and product performance limitations faced in the synthesis process of titanium dioxide, the present invention proposes a simplified hydrolysis reaction method for preparing colloidal titanium dioxide at near room temperature conditions.

[0006] This method not only uses low-cost and easily available raw materials, but also effectively synthesizes colloidal titanium dioxide with excellent dispersibility and small particle size through simplified operation steps, demonstrating obvious technological progress and practical value.

[0007] The present invention uses titanium tetrachloride as the titanium source because it has good reactivity and can react with water under relatively mild conditions to produce titanium dioxide. This choice not only reduces the cost of raw materials but also facilitates the control of the chemical purity and phase composition of the product.

[0008] The present invention emphasizes the use of distilled water as the hydrolysis medium and employs a pretreatment step of freezing in a refrigerator for 12-24 hours. This unique pretreatment step is designed to regulate the motion of water molecules and reduce the reactivity of titanium tetrachloride, thereby more precisely controlling the hydrolysis reaction rate and, consequently, effectively controlling the particle size and dispersibility of the resulting titanium dioxide colloid.

[0009] During the preparation process of the present invention, particular emphasis is placed on the dropwise addition of titanium tetrachloride to achieve precise control over the hydrolysis reaction rate and reaction heat. The titanium tetrachloride should be added dropwise onto the surface of pre-chilled distilled water. This ensures slow and uniform mixing of the reactants, thereby helping to control the size and dispersibility of the resulting titanium dioxide colloidal particles.

[0010] In the present invention, after the titanium tetrachloride is added dropwise, the mixture is left at room temperature until the ice completely melts. This step is crucial in the entire preparation process because it allows the titanium tetrachloride to slowly react with water with virtually no external heating, which helps to obtain a more uniform and stable colloidal titanium dioxide solution.

[0011] In the present invention, the melted mixture is then transferred to a water bath and heated at a controlled temperature. The present invention employs a water bath temperature of 70°C to 90°C for a duration of 1 to 3 hours. This step not only ensures the complete hydrolysis of titanium tetrachloride but also further promotes the crystallization and growth of titanium dioxide particles, ultimately yielding colloidal titanium dioxide with finer particle size and better dispersion.

[0012] In this method, after the water bath heating is complete, the reaction beaker is immediately removed from the water bath and allowed to cool naturally to room temperature. The resulting colloidal titanium dioxide solution is the final product, exhibiting excellent dispersibility and small particle size, making it suitable as a base material for a variety of applications, including high-performance coatings, photocatalysts, and antimicrobial materials.

[0013] Thanks to the preparation method described herein, the resulting colloidal titanium dioxide not only exhibits excellent self-cleaning and antibacterial properties, but also, due to its excellent dispersibility and small particle size, has extremely broad application prospects in photocatalysis, solar cells, environmental purification, and high-performance coatings. In the coatings industry in particular, this colloidal titanium dioxide can significantly improve the coating's durability, anti-pollution properties, and UV protection, meeting the market's urgent need for high-performance coatings.

[0014] Compared with existing technologies, the technical solution of the present invention offers the following significant advantages: through a simple and efficient hydrolysis reaction, high-performance colloidal titanium dioxide is prepared in a low-cost, low-energy manner. This method not only simplifies the operation process but also provides superior product performance. The successful implementation of this method has opened up new avenues for the efficient synthesis of titanium dioxide materials and their widespread application in various fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a comparison chart of colloidal titanium dioxide samples prepared according to the first embodiment of the present invention and distilled water.

[0016] Figure 2 This is a field emission scanning electron microscope photograph of colloidal titanium dioxide prepared in the first embodiment of the present invention.

[0017] Figure 3 This is the powder X-ray diffraction spectrum of the colloidal titanium dioxide prepared in the first embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further illustrated by the following specific examples, which are intended to illustrate the diversity and applicability of the present invention, rather than to limit its scope. Various possible applications and modifications of the principles of the present invention should be considered to fall within the scope of protection defined by the appended claims.

[0019] Example 1: Colloidal titanium dioxide was synthesized using a simplified titanium tetrachloride hydrolysis method. First, 100 ml of deionized water was placed in a refrigerator and frozen for 12 hours until it was completely frozen into ice cubes. Then, 0.5 ml of titanium tetrachloride was added dropwise to the surface of the ice cube at a rate of 1 drop per second. After the ice cube was completely melted at room temperature, the mixture was transferred to a 90°C water bath and heated for 2 hours. The colloidal titanium dioxide prepared by this method exhibited excellent dispersibility and small particle size, and was suitable for photocatalytic and antibacterial applications.

[0020] Example 2: In this example, similar procedures were followed as in Example 1, but 0.7 ml of titanium tetrachloride was used and the water bath temperature was adjusted to 100°C. This change was intended to explore the effects of different preparation conditions on the properties of colloidal titanium dioxide. The colloidal titanium dioxide produced by this method exhibited distinct particle size distributions and photocatalytic properties, further broadening the material's potential applications.

[0021] Example 3: In this example, 80 ml of deionized water was pre-frozen into ice cubes, and 0.5 ml of titanium tetrachloride was added dropwise to the surface. After the ice cubes melted, the mixture was heated in a 90°C water bath for 2 hours. By adjusting the hydrolysis reaction volume and water bath temperature, this example demonstrates the flexibility of the preparation process and the fine control of the final product properties.

[0022] Example 4: This example aims to explore the changes in the properties of colloidal titanium dioxide under different conditions by adjusting the water bath heating temperature and time. The operating steps are as follows: Take 100 ml of deionized water and freeze it into ice cubes for 12 hours. Add 0.5 ml of titanium tetrachloride dropwise to the surface of the ice cube, maintaining a drop rate of 1 drop / second. After it is completely melted, the mixture is placed in a 90°C water bath. Unlike the previous example, the heating time is extended to 3 hours. This adjustment is intended to test the effect of heating time on the crystallinity and photocatalytic performance of titanium dioxide particles. It is expected that colloidal titanium dioxide with higher crystallinity can be obtained by a longer water bath time, thereby improving its photocatalytic efficiency.

[0023] The above examples demonstrate the possibility of finely controlling the particle size and dispersibility of colloidal titanium dioxide by controlling the hydrolysis conditions (such as the amount of titanium tetrachloride added, the volume of the hydrolysis medium, and the temperature of the water bath). The differentiated setting of these conditions not only verifies the reliability and repeatability of the preparation method but also reveals the potential for optimizing material properties by adjusting the preparation conditions. Therefore, the synthesis method provided by the present invention is not only suitable for producing colloidal titanium dioxide with highly self-cleaning and antibacterial properties, but also lays a foundation for further material performance research and application development. Due to its unique preparation method and excellent performance, the colloidal titanium dioxide of the present invention is expected to have broad application prospects in a variety of fields, including environmental purification, photocatalysis, and antibacterial coatings.

Claims

1. Claim 1: A method for synthesizing colloidal titanium dioxide, characterized in that: The following steps are involved: a) freezing deionized water in a refrigerator for 12-24 hours until completely frozen into ice; b) adding titanium tetrachloride dropwise onto the surface of the ice at a rate of 1 drop / second; c) after the ice has completely melted at room temperature, transferring the mixture to a water bath, controlling the water bath temperature and heating it at 70°C-90°C for 1-3 hours; d) after heating, allowing the reaction mixture to cool naturally to room temperature to obtain colloidal titanium dioxide with excellent dispersibility and small particle size.

2. Claim 2: The synthesis method according to claim 1, wherein the amount of titanium tetrachloride added is 0.5 ml to 0.7 ml.

3. Claim 3: The synthesis method according to claim 1 or 2, wherein the temperature range of the water bath heating is 70°C to 90°C.

4. Claim 4: A method according to any preceding claim, wherein the volume of deionized water is 80 ml to 100 ml.

5. Claim 5: The synthesis method according to any preceding claim, wherein the water bath temperature treatment time after the mixture is heated is 1 hour to 3 hours.

6. Claim 6: A colloidal titanium dioxide prepared by the method of claim 1, characterized in that: The colloidal titanium dioxide exhibits excellent dispersibility and a small particle size.

7. Claim 7: The colloidal titanium dioxide according to claim 6, wherein the colloidal titanium dioxide is used for photocatalysts, antibacterial materials or high-performance coatings.

8. Claim 8: A composite material comprising the colloidal titanium dioxide according to claim 6, characterized in that: The composite material has high self-cleaning and / or antibacterial properties.

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