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Niobium doped Zincoxide nanoparticles has been synthesized through electrochemical method and characterized by UV-Visible spectroscopy, IR Spectroscopy, SEM, XRD, ICPMS and EDAX data. The UV-Visible spectroscopy result reveals that the band gap energy of ZnO/Nb2O5 nanoparticles to be 3.8 eV. The XRD results show that the crystallite size is to be 31.9 nm. The ICPMS data indicate the presence of 3,3461,328 counts of 93 Nb and 577,906,390 counts of 66 Zn. An improvement in the photocatalytic degradation of Indigocarmine dye (IC) in comparison to commercially available pure ZnO was observed. The photodegradation efficiency for ZnO/Nb2O5 and ZnO were found to be 97.4% and 52.1% respectively. The enhancement in photocatalytic activity of ZnO/ Nb2O5 was ascribed to the extended light absorption range and suppression of electron hole pair recombination upon Nb loading. The antibacterial activity of ZnO/Nb2O5 nanoparticles was investigated. These particles were shown to have an effective bactericide.

Selenium sulfide (SeS 2 ) nano photocatalyst was prepared by a facile electrochemical method and characterized by XRD, scanning electron microscope, Energy dispersive X-ray analysis and IR spectroscopy. The XRD showed that SeS 2 is amorphous and has an average crystallite size of 41.26 nm which has a triclinic structure. The photocatalytic activity of the sample was evaluated by the degradation of textile dye indigo carmine in aqueous solutions under ultraviolet radiation. The photocatalytic decolourization of the dye follows first-order kinetics. High efficiency was achieved at a very low concentration of 0.003 g of SeS 2 nanoparticle. Easy separation from suspension by spontaneous sedimentation and reusability of the catalyst make these photocatalysts suitable for waste water treatment. Evidently, the anti-bacterial activity of SeS 2 is considerable compared with the standard drug. cathode Se 4+ Se 4+ anode STEP:1 Electrochemical deposition of Se STEP:2 170 0 C 2M Na 2 S solution nanoparticles cathode SeS 2

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