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Antibacterial Effect and Applications of Nano-TiO2

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Date added: 31 October 2019
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Title: Antibacterial Effect and Applications of Nano-TiO2


1
Antibacterial Effect and Applications of Nano-TiO2
2
  • 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.

3
  • 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.

4
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.

5
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.

6
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.

7
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.

8
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.

9
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.
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