Saturday, September 26, 2020

Waste Water Treatment using Semiconductor Nanomaterials

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, 19791982.

3.  Grandcolas.M, Ye.JandHanagata.N, Combination of Photocatalytic and Antibacterial Effects of Silver Oxide Loaded on Titania Nanotubes, Mater. Lett., 2011, 65, 236239

4.   Boxi .S.S; Paria.S.Visible light induced enhanced photocatalytic degradation of organic pollutants in                 aqueous media using Ag doped hollow TiO2 nanospheres.RSC Adv., 2015, 5, 37657.



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