Antibacterial Effect and Applications of Nano-TiO2

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Antibacterial Effect and Applications of Nano-TiO2
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• Compared with common materials, nanomaterials
  have a series of excellent properties that make
  nano-antibacterial agents prepared by
  nanotechnology have excellent antibacterial
  effects unmatched by traditional antibacterial
  agents. Nano antibacterial agents can be divided
  into two categories according to their mechanism
  of action on microorganisms one is
  photocatalytic semiconductor materials such as
  nano zinc oxide, Nano-TiO2 (nano titanium
  dioxide), etc. the other is antibacterial active
  metal nanomaterials.

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• As a new type of antibacterial material,
  nano-TiO2 (nano titanium dioxide) has the
  advantages of non-toxic, non-irritating, thermal
  stability, heat resistance, long-lasting
  antibacterial effect and high-efficiency
  sterilization. It is of great significance for
  preventing disease transmission, purifying
  environment, and protecting human health.

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Advantages of nano-TiO2 as an antibacterial agent

• 1 It is non-toxic to human body and
  non-irritating to the skin
• 2 Strong antibacterial ability and wide
  antibacterial range
• 3 Odourless and Washable
• 4 Long storage life
• 5 Good thermal stability (no discoloration, no
  decomposition, no volatilization, no
  deterioration at high temperature)
• 6 Nano-TiO2 antibacterial agents take only one
  hour to get effect, while other silver
  antibacterial agents take about 24 hours.
• 7 Nano-TiO2 can permanently maintain
  antibacterial effect.

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Applications of nano-TiO2 as an antibacterial
agent

• Antibacterial plastic
• The nano-TiO2 powder can be blended with resin
  polymer material to prepare antibacterial
  plastic. The nano-TiO2 forms a surface layer
  having antibacterial ability on the surface of
  the resin, and then exerts a bactericidal action
  by contact with the packaged object. Since the
  nano-TiO2 is in the form of powder, it is
  generally required to uniformly disperse these
  powders into the resin during processing to
  obtain a desired antibacterial effect. Therefore,
  the antibacterial agent is usually first made
  into an antibacterial masterbatch, which is then
  mixed with the resin in a desired ratio. In
  addition, it is also necessary to consider the
  compatibility of the antibacterial agent with the
  resin, so the antibacterial agent is usually
  pretreated by adding a coupling agent or a
  dispersing agent.

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Antibacterial coating

• Since titanium dioxide is photocatalytic and
  super-hydrophilic, the incorporation of nano-TiO2
  into architectural coatings can improve the water
  repellency and anti-staining properties of the
  coating. The nano-TiO2 powder has a good
  shielding ability against ultraviolet rays, and
  thus can enhance the weather resistance of the
  coating. Compared with traditional coatings, the
  nano-TiO2-modified coatings have no harm to the
  human body and the environment. Nano TiO2
  antibacterial coating has a long-lasting
  bactericidal effect, and it can also exert strong
  bactericidal effect under natural light,
  fluorescent lamp and even dark conditions.

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Antibacterial ceramic

• Coating the titanium dioxide film on the finished
  ceramic product and then sintering it at a low
  temperature can achieve the effect of
  photocatalytic antibacterial action, thereby
  inhibiting the proliferation of bacteria on the
  ceramic surface. To achieve the effect of
  sterilization under low light, silver and copper
  ion compounds can be added to the titanium
  dioxide slurry. Antibacterial ceramic tiles and
  sanitary ceramics coated with nano-TiO2 film have
  been industrially produced in Japan, and are
  mainly used in hospitals, food processing
  industries etc., but the antibacterial effect is
  limited by the light conditions. In order to make
  full use of indoor sunlight and low light, new
  antibacterial ceramics have been actively
  developed.

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Air purification

• Harmful air in the environment can be classified
  into indoor harmful gas and atmospheric
  pollutant. Indoor harmful gases mainly include
  formaldehyde released from decorative materials
  and methyl mercaptan, hydrogen sulfide and
  ammonia produced in the living environment.
  Nano-TiO2 photocatalyst can effectively decompose
  indoor and outdoor organic pollutants including
  formaldehyde, toluene, acetaldehyde and ammonia
  to purify air. The photocatalytic process of
  nano-TiO2 in air is to convert oxygen and water
  vapor into free radicals such as OH, O, HO
   under illumination, and then these free radicals
  combine with CO, SOx , NOx and other pollutants
  to form harmless products.

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Sewage treatment

• Sewage treatment should remove harmful
  substances, suspended solids, sediment, bacteria,
  viruses, odors, pigments and other pollutants
  from the water. Traditional water treatment
  methods have the disadvantages of high
  investment, high power consumption, low
  efficiency, high operating cost and secondary
  pollution. However, the development and
  application of nanotechnology has solved these
  problems. Through the photocatalysis of
  nanoparticles, nano-TiO2 can directly decompose
  organic or inorganic toxic pollutants under
  sunlight or ultraviolet light, and the pollutants
  can be completely mineralized or oxidized into
  harmless CO2 and H2O without causing secondary
  pollution. Nanotechnology has shown great
  potential for the degradation of nitrogen oxides
  and other organic matter in wastewater.