ORCID Profile
0000-0001-8062-7791
Current Organisation
Universidade Federal de São Carlos
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Publisher: Elsevier BV
Date: 11-2012
Publisher: Springer Science and Business Media LLC
Date: 05-04-2011
Publisher: Springer Science and Business Media LLC
Date: 30-10-2014
Publisher: Springer Science and Business Media LLC
Date: 15-03-2013
Publisher: Elsevier BV
Date: 02-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA20266B
Publisher: Elsevier BV
Date: 2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CE05977G
Publisher: American Chemical Society (ACS)
Date: 27-04-2020
Publisher: Wiley
Date: 30-03-2018
DOI: 10.1002/JRS.5377
Publisher: FapUNIFESP (SciELO)
Date: 12-2017
DOI: 10.1590/0366-69132017633682190
Abstract: Abstract Pure forms of alkaline-earth stannates with perovskite structure (ASnO3, A= Ca2+, Sr2+, Ba2+) have been used as photocatalysts. In this work, CaSnO3 perovskite s le was synthesized by a modified Pechini method at 800 ºC and characterized by X-ray diffraction (XRD), UV-visible spectroscopy, infrared spectroscopy and Raman spectroscopy. The photocatalytic degradation of remazol golden yellow (RNL) dye under UV radiation was evaluated. The XRD pattern showed that the synthesis method favored the orthorhombic CaSnO3 crystallization. According to the Raman spectrum, a material with high short-range order was obtained despite of the relatively low synthesis temperature, compared to the solid-state reaction one. The highest photocatalytic activity was attained at pH 3, which presented 51% discoloration and improved activity of 35% compared to discoloration solely due to adsorption (absence of radiation). The point of zero charge (PZC) and the photocatalytic results indicated that a direct mechanism prevailed at pH 3, whereas an indirect mechanism prevailed at pH 6.
Publisher: American Chemical Society (ACS)
Date: 21-09-2012
DOI: 10.1021/IC300948N
Abstract: In this paper, we report our initial research to obtain hexagonal rod-like elongated silver tungstate (α-Ag(2)WO(4)) microcrystals by different methods [sonochemistry (SC), coprecipitation (CP), and conventional hydrothermal (CH)] and to study their cluster coordination and optical properties. These microcrystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinements, Fourier transform infrared (FT-IR), X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) spectroscopies. The shape and average size of these α-Ag(2)WO(4) microcrystals were observed by field-emission scanning electron microscopy (FE-SEM). The optical properties of these microcrystals were investigated by ultraviolet-visible (UV-vis) spectroscopy and photoluminescence (PL) measurements. XRD patterns and Rietveld refinement data confirmed that α-Ag(2)WO(4) microcrystals have an orthorhombic structure. FT-IR spectra exhibited four IR-active modes in a range from 250 to 1000 cm(-1). XANES spectra at the W L(3)-edge showed distorted octahedral [WO(6)] clusters in the lattice, while EXAFS analyses confirmed that W atoms are coordinated by six O atoms. FE-SEM images suggest that the α-Ag(2)WO(4) microcrystals grow by aggregation and the Ostwald ripening process. PL properties of α-Ag(2)WO(4) microcrystals decrease with an increase in the optical band-gap values (3.19-3.23 eV). Finally, we observed that large hexagonal rod-like α-Ag(2)WO(4) microcrystals prepared by the SC method exhibited a major PL emission intensity relative to α-Ag(2)WO(4) microcrystals prepared by the CP and CH methods.
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 09-2017
DOI: 10.1016/J.ULTSONCH.2017.03.007
Abstract: Copper tungstate (CuWO
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CE25771H
Publisher: American Chemical Society (ACS)
Date: 03-01-2014
DOI: 10.1021/JP408167V
Publisher: Springer Science and Business Media LLC
Date: 07-2009
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 2008
Publisher: Springer Science and Business Media LLC
Date: 30-07-2011
Publisher: Elsevier BV
Date: 06-2019
Publisher: Springer Science and Business Media LLC
Date: 24-06-2009
Publisher: Springer Science and Business Media LLC
Date: 07-2009
Location: Brazil
No related grants have been discovered for Elson Longo.