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Visible light photocatalytic degradation of Textile Azo dyes using Sn doped ZnO nanorods

G. Poongodia,*, R. Rajeswarib

aDepartment of Physics, Quaid-e-Millath Govt. College for Women, Chennai –600 002

bDepartment of Chemistry, Quaid-e-Millath Govt. College for Women, Chennai –600 002

The surface and ground water bodies are grossly polluted as a result of uncontrolled discharges from industries. The effluents from textiles, tanning, pesticides, petrochemical, pharmaceutical, distilleries etc. are highly coloured and contains vast amount of toxic and non-biodegradable pollutants, which are difficult to treat. Particularly, the wastewaters from textile industries are highly coloured and with organics which are difficult to mineralize. Hence, attempt has been made to treat them by using cost effective ZnO nanorods. Here, Sn doped ZnO nanorods were prepared by hydrothermal method. The XRD results revealed that the sample showed a hexagonal wurtzite structure. The result of EDAX revealed that Sn was doped in to ZnO lattices. FESEM image shows that the sample possesses hexagonal rod morphology with an average of 1µm in length and 50 to 100nm in diameter. Optical transmittance of the sample was recorded in the wavelength range of 300–800 nm, and the band gap of the samples was determined. The photocatalytic activity of Sn doped ZnO nanorods were tested with different azo dyes using visible light (365nm) in an annular photoreactor. The results reveal that the decolourisation was complete in 45 minutes whereas the organics were removed at 180 min. Complete mineralisation of organics could be achieved by further optimizing the reactor parameters depending on the industrial requirement.

Key words: Sn doped ZnO, Nanorod, Photocatalytic activity, AZO dyes.

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