title: Facile synthesis of PbWO4: applications in photoluminescence and photocatalytic degradation of organic dyes under visible light.
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.
authors.affiliation: Centre for Converging Technologies, University of Rajasthan, Jaipur 302 005, India.
authors.forename: Rohit
authors.initials: R
authors.lastname: Saraf
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India. Electronic address: shiva@sscu.iisc.ernet.in.
authors.forename: C
authors.initials: C
authors.lastname: Shivakumara
authors.affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: Sukanti
authors.initials: S
authors.lastname: Behera
authors.affiliation: C. N. R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.affiliation: Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India.
authors.forename: N
authors.initials: N
authors.lastname: Dhananjaya
mesh_terms: D000327:Adsorption; D002384:Catalysis / Q000528:radiation effects; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D007700:Kinetics; D008027:Light; D049449:Luminescence; D008751:Methylene Blue / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis / Q000528:radiation effects; D011208:Powders; D059027:Recycling; D012235:Rhodamines / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D017973:Tungsten Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D009930:Organic Chemicals; D011208:Powders; D012235:Rhodamines; D017973:Tungsten Compounds; C481386:lead tungstate; C029773:rhodamine B; D008751:Methylene Blue
keywords: PbWO(4); Phosphor; Photocatalytic degradation; Rietveld refinement; Scheelite structure