Investigation of photoluminescent, photocatalytic and bactericide properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4

• Grant number: 12/18597-0
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: April 01, 2013
• End date: September 30, 2013
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: José Arana Varela
• Grantee: Marcio Aurélio Pinheiro Almeida
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated research grant: 98/14324-0 - Multidisciplinary Center for Development of Ceramic Materials, AP.CEPID

Abstract

In this project, we propose to investigate photoluminescence, photocatalytic and bactericidal properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4 (x = 0, 1, 2, and 3 %). These compounds will are synthesized from aqueous solutions of their salts (Na2WO4.2H2O, CaNO3.4H2O, ZnNO3, and AgNO3) which will be processed in a hydrothermal system assisted by microwave radiation. The crystals will be obtained and characterized by X-ray diffraction, Raman spectroscopy, infrared vibrational spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and electron paramagnetic resonance spectroscopy (EPR). This post-doctoral project aims to synthesis, characterization and investigation of photoluminescent, photocatalytic and bactericidal properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4, percentage (0, 1, 2 and 3% ) as function of Ag1+ and Zn2+ added in the matrix CaWO4. The optical properties will are investigated by electronic spectroscopy in the ultraviolet-visible and photoluminescence measurements. The photocatalytic activity of the crystals will be evaluated by degradation of the dye rhodamine B and methyl orange in aqueous solutions. The bactericidal activity of Escherichia coli and Salmonella typhi will be investigated at infected accumulated water by conventional method of total count of dead bacteria on glass plates.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ALMEIDA, M. A. P.; LIMA, J. R. O.; MORILA-SANTOS, C.; LISBOA FILHO, P. N.; SIU LI, M.; LONGO, E.; CAVALCANTE, L. S.. Effect of Zn2+ ions on the structure, morphology and optical properties of CaWO4 microcrystals. Journal of Sol-Gel Science and Technology, v. 72, n. 3, p. 648-654, DEC 2014. (09/50303-4, 12/18597-0, 13/07296-2)

BATISTA, F. M. C.; LA PORTA, F. A.; GRACIA, L.; CERDEIRAS, E.; MESTRES, L.; LI, M. SIU; BATISTA, N. C.; ANDRES, J.; LONGO, E.; CAVALCANTE, L. S.. A joint experimental and theoretical study on the electronic structure and photoluminescence properties of Al-2(WO4)(3) powders. Journal of Molecular Structure, v. 1081, p. 381-388, FEB 5 2015. (09/50303-4, 12/18597-0)