Continuously increase of toxic organic component in surface and ground water become an emerging issue for the environment in the recent years. Different classes of numerous organic compounds have been passes through sewage treatment plants (STPs) of industry and municipality, which in turn contaminate in the aquatic environment. In general, organic compounds present in industrial wastewater are difficult to degrade due to its complicated structures. The toxic compounds present in water include aromatic compounds, antibiotics, dyes, etc. There is a dangerous effect of such component towards human beings, animals and other aquatic life when presence in excess quantity in water.
Metal oxide semiconductor nanomaterial plays
an important role in degradation of the organic compounds in water. Photo
catalytic degradation of toxic organic compounds in water is considered as an
advance water treatment process over conventional processes such as membrane
filtration, adsorption, etc. Semiconductor nanomaterials have a great role in
the degradation of organic pollutants in water. Semiconductor materials such as
TiO2, CdS, ZnS, etc have prominent role in the photo degradation of
organic compounds.
Among several
metal oxide semiconductor nanoparticles TiO2 is proved to be a
promising candidate for photo catalysis because of its higher efficiency, low
toxicity, and long term stability, low cost, photo induced strong oxidation
activity. Along with band gap of material surface area is also an important
parameter to enhance the activity of anyphoto catalyst. Nanomaterials of different
morphologies such as nanowires, nanotubes, nano rods, and nano sphere were
proved to be more active compared to regular spherical nanomaterials.
Especially hollow nanoparticles have attracted considerable attention because
of its larger surface area along with some parameter, such as low density, good
surface permeability and high light-harvesting efficiencies.
Reference:
1. Boxi .S.S; Paria.S. Effect of silver doping on TiO2, CdS, and
ZnSnanoparticles for the photocatalytic degradation of
metronidazole under visible light.RSC Adv.,
2014, 4, 37752.
2. Ji.L, Wang.Z, Li.Z and Liang.J,
Preparation of Aligned Titania Nanowires with an Aligned Carbon Nanotube
Composite Template, Mater. Lett., 2008, 62, 1979–1982.
3. Grandcolas.M, Ye.JandHanagata.N,
Combination of Photocatalytic and Antibacterial Effects of Silver Oxide Loaded on Titania Nanotubes, Mater.
Lett., 2011, 65, 236– 239
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