Excellent representative of inorganic non-metallic materials-nano titanium dioxide

nano titanium dioxide

‌TiO2) Is a sub-micron titanium oxide material, its appearance is white powder, no special odor, soluble in isopropanol, ethanol and hot concentrated sulfuric acid, insoluble in water. Nano-titanium dioxide has the characteristics of small size effect, surface effect, quantum size effect, macroscopic quantum tunneling effect and dielectric confinement effect. Due to its excellent optical properties, nano-titanium dioxide performs well in ultraviolet absorption and can absorb wavelengths less410 nmIt is widely used in environmental protection, battery manufacturing, petrochemical, cosmetics, optoelectronic devices and other fields.

Nano titanium dioxide has the following characteristics:

Optical properties: it has the function of shielding ultraviolet rays, and has good dispersion and strong weather resistance.

Antibacterial: It has strong antibacterial properties to bacteria, can be used in soil, and has strong antibacterial properties to all bacteria.

Hydrophilicity: The surface is hydrophilic, with good dispersion, anti-aging, scrub resistance, weather resistance and UV shielding performance.

Chemical stability: high chemical stability, insoluble in water, organic acids and weak inorganic acids, but soluble in sulfuric acid, alkali and hydrofluoric acid.

Classification of crystal type:

There are two main crystalline forms of nano-titanium dioxide: anatase (Anatase) and rutile (Rutile).

Rutile nano titanium dioxide: This type of nano titanium dioxide is more stable than anatase titanium dioxide. It is often used in cosmetics, functional fibers, plastics, coatings and other fields, and can be used as a UV shielding agent.

Anatase nano titanium dioxide: the appearance of white loose powder, has a good photocatalytic effect, can degrade harmful gases and some inorganic compounds in the air, widely used in photocatalyst and air purification products.

Application scenarios of different specifications

TiO2 20-50Specific surface area:100-150m2/gActivity:95%above powder

TiO2 50-100Specific surface area:80-120m2/gActivity:90%Above coating

TiO2 100-200Specific surface area:50-80m2/gActivity:80%above photocatalysis

Nano titanium dioxide has a wide range of applications in many fields:

Automotive industry: used for high-end automotive topcoat, with different color effect with angle.

Cosmetics: as a UV shielding agent to prevent the damage of ultraviolet rays.

Functional fiber: used for antibacterial fiber and deodorant fiber, with excellent health care function.

Plastics, coatings, paints: used in plastics, coatings and paints to improve the weather resistance and antibacterial properties of materials.

Antibacterial building materials and coatings: used for antibacterial building materials and antibacterial coatings, with antibacterial, antirust, decomposition of odor and other functions.

Water treatment: used for water treatment to kill bacteria such as E. coli by sunlight.

 nano titanium dioxide preparation method:

1.Sol-Gel method: the titanium source is dissolved in water or organic solvent, and acidic substances such as hydroxide or hydrochloric acid are added to form titanate sol. After hydrolysis and polycondensation reaction, nano titanium dioxide gel is formed, and then dried and calcined to obtain nano titanium dioxide powder. sol-Titanium dioxide prepared by gel method has a wide range of applications, including photocatalysis, electrochemistry, optoelectronics and so on. For example, it can be used to degrade organic matter in polluted gas and wastewater, has strong oxidation ability, and is suitable for environmental protection. In addition, by doping other elements (suchFe³) can further optimize its photocatalytic performance

 

2.Hydrothermal method: The titanium source and hydroxide are mixed and dissolved in water, heated to high temperature and high pressure conditions to react to generate nano-titanium dioxide. The basic principle of hydrothermal method is that in a closed reactor, water is used as the reaction medium, heated to a certain temperature, so that the water solvent in the reactor expands to produce high pressure conditions, so as to carry out inorganic synthesis and material preparation. This method can control the morphology, size and crystal structure of nanocrystals, and is suitable for the synthesis of metal oxide nanomaterials.

 

3.Gas phase method: including physical vapor deposition and chemical vapor deposition. The physical vapor deposition method can effectively avoid chemical reactions, and the prepared nano-powder has the advantages of high purity, excellent particle dispersion, small particle size, and narrow distribution, but the deposition speed is slow and the cost is high; chemical vapor deposition method is widely used It is used to prepare nano-thin film materials such as semiconductors, oxides, nitrides, and carbides.

 

Gas phase method nano titanium dioxide has a wide range of applications in many fields:

Catalytic and photocatalytic: In the field of photocatalysis, fumed nano-titanium dioxide can decompose organic matter and purify air, and is suitable for self-cleaning building materials, solar cells, fungicides and other fields.

Ultraviolet light shielding: as a UV shielding agent to prevent the damage of ultraviolet rays, suitable for cosmetics, plastics, coatings, paints and other fields.

Lithium battery: adding gas phase nano titanium dioxide to the silicon carbon negative electrode of lithium battery can improve the performance of the battery and extend the battery life.

Other applications: adding gas phase nano titanium dioxide to silicone rubber can improve heat stability and enhance flame retardancy, suitable for ceramic and metal materials and other fields.

 

4.Plasma method: the titanium source is decomposed into nano titanium dioxide by plasma technology. This method has the advantages of short reaction time, low reaction temperature and no catalyst. The prepared nano-titanium dioxide has the characteristics of large specific surface area, small particle size and uniform distribution, and is suitable for photocatalysis and other fields.

 

5.Chlorination leaching method: grinding and microwave pre-activation of titanium ore raw materials, chlorination leaching, filtration to obtain fine filtration leaching solution, frozen crystallization is divided into two parts, one part is used to prepare nano-titanium dioxide, the other part is used to prepare rutile titanium dioxide. This method realizes the comprehensive utilization of vanadium titanium magnetite, the production cost is low, the hydrochloric acid is recycled, and the production process is environmentally friendly. Nanometer titanium dioxide has a wide range of applications in coatings, photocatalysis, cosmetics and other fields. For example, nano-titanium dioxide can be used as a photocatalyst to absorb ultraviolet rays and generate electrons and holes to promote the degradation reaction, and is often used for photocatalytic degradation of organic pollutants.

Nano titanium dioxide storage matters needing attention:

Avoid humid environments: Nano titanium dioxide should be stored in a dry environment, away from water sources and areas with high humidity. Moisture may cause the material to absorb moisture, which in turn affects its performance and effectiveness in use. It is recommended to select a well-sealed container for storage, and regularly check the sealing performance of the container.

Prevent direct sunlight: Prolonged direct sunlight may cause changes in the performance of nano-titanium dioxide. Therefore, the storage location should avoid direct sunlight, and it is best to store in a cool and ventilated place. If conditions permit, blackout curtains or sun visors can be used to further reduce the influence of sunlight on the material.

Avoid contact with chemicals: Nano-titanium dioxide should be stored separately from harmful chemicals to avoid chemical reactions. Especially strong acid, strong alkali and other corrosive substances, should strictly avoid contact with nano titanium dioxide. The storage area should be kept clean to prevent the intrusion of impurities and contaminants.

Regular inspection and recording: In order to ensure the quality and safety of nano-titanium dioxide, quality inspection should be carried out regularly and relevant data should be recorded. This helps identify and resolve potential problems in a timely manner, ensuring material stability and reliability.

 Nano titanium dioxide transport matters needing attention:

Packaging requirements: nano titanium dioxide is usually transported by road in barrels, which must meet national standards and be tightly packaged to prevent leakage or pollution during transportation.

Transportation mode selection:

Shipping: UseISOContainers are shipped by sea, and the size and volume of the container can be selected according to demand to minimize shipping costs. During transportation, non-slip mats and non-slip locking devices are required to ensure the stability of the container, while sunshade nets are used to protect the container from direct sunlight to prevent titanium dioxide from moisture.

Highway transportation: the use of barreled mode of transportation, packaging must be tight and reliable, to avoid bumps in the transport, collision and other situations.

Rail transportation: It can be transported in containers or in bulk, which requires strict testing and quality control to ensure that the quality of titanium dioxide meets the requirements.

Protective measures:

Moisture-proof: During sea transportation, sunshade nets are used to protect containers from direct sunlight to prevent titanium dioxide from moisture.

Anti-slip: In sea and road transportation, anti-slip mats and anti-slip locking devices are required to ensure the stability of the container or vehicle.

Professional quality control: take professional quality control measures to ensure that the quality of nano titanium dioxide meets the requirements.

Equipment inspection and maintenance: Strengthen the inspection and maintenance of transportation vehicles and equipment to avoid accidents.