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  • Title: Facile synthesis of PbWO4: applications in photoluminescence and photocatalytic degradation of organic dyes under visible light.
    Author: Saraf R, Shivakumara C, Behera S, Nagabhushana H, Dhananjaya N.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2015 Feb 05; 136 Pt B():348-55. PubMed ID: 25448939.
    Abstract:
    Stolzite polymorph of PbWO4 catalyst was prepared by the facile room temperature precipitation method. Structural parameters were refined by the Rietveld analysis using powder X-ray data. PbWO4 was crystallized in the scheelite-type tetragonal structure with space group I41/a (No. 88). Field emission scanning electron microscopy revealed leaf like morphology. Photoluminescence spectra exhibit broad blue emission (425 nm) under the excitation of 356 nm. The photocatalytic degradation of Methylene blue, Rhodamine B and Methyl orange dyes were measured under visible illumination. The 100% dye degradation was observed for MB and RhB dyes within 60 and 105 min. The rate constant was found to be in the decreasing order of MB>RhB>MO which followed the 1st order kinetic mechanism. Therefore, PbWO4 can be a potential candidate for blue component in white LEDs and also acts as a catalyst for the treatment of toxic and non-biodegradable organic pollutants in water.
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