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  • Title: Solar Photocatalytic and Self-Cleaning Performances of HoVO₄ Doped ZnO.
    Author: Thirumalai K, Shanthi M, Swaminathan M.
    Journal: J Nanosci Nanotechnol; 2018 Jan 01; 18(1):178-187. PubMed ID: 29768829.
    Abstract:
    In this article we report preparation of 5 wt% HoVO4 doped ZnO via template-free hydrothermal process and investigated its photocatalytic activity against azo dyes Rhodamine-B (Rh-B), Trypan Blue (TB) and Acid Black 1 (AB 1) in solar light irradiation. The as prepared HoVO4 doped ZnO was characterised by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Field emission Transmission electron microscopy (FE-TEM), Brunauer-Emmett-Teller (BET) surface area measurements, X-ray photoelectron spectroscopy (XPS), Diffused reflectance (DRS) and Photoluminescence (PL) spectroscopy. The SEM images clearly indicate the formation of nanoparticles in the range of 20-50 nm. BET surface area of the HoVO4-ZnO is 2 times that of ZnO. Higher activity of HoVO4-ZnO in natural sunlight may be due to higher visible light absorption of HoVO4- ZnO when compared to undoped ZnO. The results suggested that HoVO4 doping on ZnO has great influence on the photocatalytic activity. The prepared photocatalyst HoVO4-ZnO possesses high stability and reusability without appreciable loss of catalytic activity up to four runs. Significant hydrophobicity of HoVO4-ZnO reveals its self cleaning property.
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