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Pereira PFDS, De Foggi CC, Gouveia AF, Pinatti IM, Cabral LA, Guillamon E, Sorribes I, San-Miguel MA, Vergani CE, Simões AZ, da Silva EZ, Cavalcante LS, Llusar R, Longo E, Andrés J. Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions. Int J Mol Sci 2022; 23:ijms231810589. [PMID: 36142511 PMCID: PMC9504239 DOI: 10.3390/ijms231810589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 08/31/2022] [Accepted: 09/06/2022] [Indexed: 02/02/2023] Open
Abstract
In this work, α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) solid solutions with enhanced antibacterial (against methicillin-resistant Staphylococcus aureus) and antifungal (against Candida albicans) activities are reported. A plethora of techniques (X-ray diffraction with Rietveld refinements, inductively coupled plasma atomic emission spectrometry, micro-Raman spectroscopy, attenuated total reflectance–Fourier transform infrared spectroscopy, field emission scanning electron microscopy, ultraviolet–visible spectroscopy, photoluminescence emissions, and X-ray photoelectron spectroscopy) were employed to characterize the as-synthetized samples and determine the local coordination geometry of Cu2+ cations at the orthorhombic lattice. To find a correlation between morphology and biocide activity, the experimental results were sustained by first-principles calculations at the density functional theory level to decipher the cluster coordinations and electronic properties of the exposed surfaces. Based on the analysis of the under-coordinated Ag and Cu clusters at the (010) and (101) exposed surfaces, we propose a mechanism to explain the biocide activity of these solid solutions.
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Affiliation(s)
- Paula Fabiana dos Santos Pereira
- CDMF, LIEC, Department of Chemistry, Federal University of São Carlos (UFSCar), P.O. Box 676, São Carlos 13565-905, SP, Brazil
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Camila Cristina De Foggi
- Department of Conservative Dentistry, Faculty of Dental Sciences, Federal University of Rio Grande do Sul, Rio Grande do Sul 90035-004, RS, Brazil
| | - Amanda Fernandes Gouveia
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
- Institute of Chemistry, State University of Campinas (Unicamp), Campinas 13083-859, SP, Brazil
| | - Ivo Mateus Pinatti
- Department of Chemistry, Federal University of Maranhao, Avenida dos Portugueses, 1966, São Luís 65080-805, MA, Brazil
| | - Luís Antônio Cabral
- Institute of Physics, “Gleb Wataghin” (IFGW), State University of Campinas, Campinas 13083-859, SP, Brazil
| | - Eva Guillamon
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Iván Sorribes
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Miguel A. San-Miguel
- Institute of Chemistry, State University of Campinas (Unicamp), Campinas 13083-859, SP, Brazil
| | - Carlos Eduardo Vergani
- Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araraquara, São Paulo State University (UNESP), P.O. Box 1680, Araraquara 14801-903, SP, Brazil
| | - Alexandre Zirpoli Simões
- Faculty of Engineering of Guaratinguetá, São Paulo State University (UNESP), Guaratinguetá 12516-410, SP, Brazil
| | - Edison Z. da Silva
- Institute of Physics, “Gleb Wataghin” (IFGW), State University of Campinas, Campinas 13083-859, SP, Brazil
| | - Laécio Santos Cavalcante
- PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina 64002-150, PI, Brazil
| | - Rosa Llusar
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Elson Longo
- CDMF, LIEC, Department of Chemistry, Federal University of São Carlos (UFSCar), P.O. Box 676, São Carlos 13565-905, SP, Brazil
| | - Juan Andrés
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
- Correspondence:
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Joseita Dos Santos Costa M, Dos Santos Costa G, Estefany Brandão Lima A, Eduardo da Luz Júnior G, Longo E, Santos Cavalcante L, da Silva Santos R. Photocurrent Response and Progesterone Degradation by Employing WO 3 Films Modified with Platinum and Silver Nanoparticles. Chempluschem 2020; 83:1153-1161. [PMID: 31950714 DOI: 10.1002/cplu.201800534] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Indexed: 11/08/2022]
Abstract
The effect of silver (Ag0 ) and platinum (Pt0 ) metallic nanoparticles (NPs) on WO3 film was investigated by studying the photocurrent response under polychromatic irradiation. The structural phase revealed by X-ray diffraction analysis indicates a monoclinic crystal nanostructure. WO3, Ag0 /WO3, and Pt0 /WO3 electrodes were used to degrade 0.35 mg L-1 progesterone hormone in aqueous solution under polychromatic irradiation for 3h. The studies on degradation were investigated under electrochemically assisted heterogeneous photocatalysis (EHP) conditions. For photodegradation of progesterone, higher performance was achieved when WO3 was functionalized and when the EHP configuration was adopted with bias at +0.7 V vs Ag/AgCl. This study reveals that incorporation of metallic NPs onto a semiconductor increases its efficiency, thereby preventing electron-hole recombination in the photocatalyst and photoelectrochemical limitations of WO3 due to surface plasmon resonance and the trapping state. Therefore, efficient advances in the degradation of organic contaminants during water treatment can be realized.
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Affiliation(s)
- Maria Joseita Dos Santos Costa
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Gilson Dos Santos Costa
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Aline Estefany Brandão Lima
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Geraldo Eduardo da Luz Júnior
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Elson Longo
- Department of Chemistry of Materials, CDMF-Universidade Estadual Paulista, P.O. Box 355, Araraquara, SP 14801-907, Brazil
| | - Laécio Santos Cavalcante
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
| | - Reginaldo da Silva Santos
- Department of Chemistry PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina, PI 64002-150, Brazil
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Sousa GDS, Nobre FX, Araújo Júnior EA, Sambrano JR, Albuquerque ADR, Bindá RDS, Couceiro PRDC, Brito WR, Cavalcante LS, Santos MRDMC, de Matos JME. Hydrothermal synthesis, structural characterization and photocatalytic properties of β-Ag2MoO4 microcrystals: Correlation between experimental and theoretical data. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.07.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Souza ELS, Sczancoski JC, Nogueira IC, Almeida MAP, Orlandi MO, Li MS, Luz RAS, Filho MGR, Longo E, Cavalcante LS. Structural evolution, growth mechanism and photoluminescence properties of CuWO 4 nanocrystals. Ultrason Sonochem 2017; 38:256-270. [PMID: 28633825 DOI: 10.1016/j.ultsonch.2017.03.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 03/06/2017] [Accepted: 03/06/2017] [Indexed: 05/27/2023]
Abstract
Copper tungstate (CuWO4) crystals were synthesized by the sonochemistry (SC) method, and then, heat treated in a conventional furnace at different temperatures for 1h. The structural evolution, growth mechanism and photoluminescence (PL) properties of these crystals were thoroughly investigated. X-ray diffraction patterns, micro-Raman spectra and Fourier transformed infrared spectra indicated that crystals heat treated and 100°C and 200°C have water molecules in their lattice (copper tungstate dihydrate (CuWO4·2H2O) with monoclinic structure), when the crystals are calcinated at 300°C have the presence of two phase (CuWO4·2H2O and CuWO4), while the others heat treated at 400°C and 500°C have a single CuWO4 triclinic structure. Field emission scanning electron microscopy revealed a change in the morphological features of these crystals with the increase of the heat treatment temperature. Transmission electron microscopy (TEM), high resolution-TEM images and selected area electron diffraction were employed to examine the shape, size and structure of these crystals. Ultraviolet-Visible spectra evidenced a decrease of band gap values with the increase of the temperature, which were correlated with the reduction of intermediary energy levels within the band gap. The intense photoluminescence (PL) emission was detected for the sample heat treat at 300°C for 1h, which have a mixture of CuWO4·2H2O and CuWO4 phases. Therefore, there is a synergic effect between the intermediary energy levels arising from these two phases during the electronic transitions responsible for PL emissions.
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Affiliation(s)
- E L S Souza
- PPGQ-CCN-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, 64002-150 Teresina, PI, Brazil
| | - J C Sczancoski
- DQ-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, São Carlos, SP 13565-905, Brazil
| | - I C Nogueira
- ICE-Universidade Federal do Amazonas, Av. Rodrigo Otávio Japiim, P.O. Box 670, 69077-000 Manaus, AM, Brazil
| | - M A P Almeida
- CCT-Universidade Federal do Maranhão, P.O. Box 322, 65080-805 São Luís, MA, Brazil
| | - M O Orlandi
- Departamento de Físico-Química, Universidade Estadual Paulista, 14800-060 Araraquara, SP, Brazil
| | - M S Li
- IFSC-Universidade de São Paulo, P.O. Box 369, 13560-970 São Carlos, SP, Brazil
| | - R A S Luz
- PPGQ-CCN-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, 64002-150 Teresina, PI, Brazil
| | - M G R Filho
- PPGQ-CCN-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, 64002-150 Teresina, PI, Brazil
| | - E Longo
- Departamento de Físico-Química, Universidade Estadual Paulista, 14800-060 Araraquara, SP, Brazil
| | - L S Cavalcante
- PPGQ-CCN-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, 64002-150 Teresina, PI, Brazil.
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Araújo Júnior EA, Nobre FX, Sousa GDS, Cavalcante LS, Rita de Morais Chaves Santos M, Souza FL, Elias de Matos JM. Synthesis, growth mechanism, optical properties and catalytic activity of ZnO microcrystals obtained via hydrothermal processing. RSC Adv 2017. [DOI: 10.1039/c7ra03277c] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Herein we describe ZnO microcrystals obtainedviahydrothermal processing at 120, 150 and 180 °C, assisted by CTAB.
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Affiliation(s)
- Edgar Alves Araújo Júnior
- Interdisciplinary Laboratory of Advanced Materials
- LIMAV
- Natural Sciences Centre
- CCN
- Department of Chemistry
| | - Francisco Xavier Nobre
- Laboratory of Research in Biology and Chemistry
- LPBQ
- Campus Coari
- Federal Institute of Amazonas
- IFAM
| | - Giancarlo da Silva Sousa
- Interdisciplinary Laboratory of Advanced Materials
- LIMAV
- Natural Sciences Centre
- CCN
- Department of Chemistry
| | - Laécio Santos Cavalcante
- GERATEC
- Natural Sciences Centre (Centro de Ciências da Natureza)
- University of State of Piauí (Universidade Estadual do Piauí)
- Teresina
- Brazil
| | | | - Flavio Leandro Souza
- Natural and Human Sciences Centre (Centro de Ciências Naturais e Humanas – CCNH)
- Federal University of ABC (Universidade Federal do ABC)
- 09210-170 Santo André
- Brazil
| | - José Milton Elias de Matos
- Interdisciplinary Laboratory of Advanced Materials
- LIMAV
- Natural Sciences Centre
- CCN
- Department of Chemistry
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Gouveia AF, Sczancoski JC, Ferrer MM, Lima AS, Santos MRMC, Li MS, Santos RS, Longo E, Cavalcante LS. Experimental and theoretical investigations of electronic structure and photoluminescence properties of β-Ag2MoO4 microcrystals. Inorg Chem 2014; 53:5589-99. [PMID: 24840935 DOI: 10.1021/ic500335x] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this paper, we investigate a correlation between theoretical calculations and experimental data to explain the electronic structure and optical properties of silver molybdate (β-Ag2MoO4) microcrystals synthesized by the microwave-assisted hydrothermal method. X-ray diffraction, Rietveld refinement, and micro-Raman spectroscopy confirmed that these microcrystals crystallize in a spinel-type cubic structure. Field-emission scanning electron microscopy images revealed that the processing temperatures influence in the final shape of microcrystals. Optical properties were analyzed by ultraviolet-visible diffuse reflectance spectroscopy; the increase in the optical band gap energy (Egap) (from 3.24 to 3.31 eV) with processing temperature is associated with the reduction of intermediary energy levels. First-principles quantum mechanical calculations based on the density functional theory at the B3LYP level were conducted. The calculated band structure revealed an indirect Egap of approximately 4.00 and 3.34 eV for the β-Ag2MoO4 without and with the formation of defects, respectively. Theoretical calculations based on density of states and electron density maps were employed to understand the polarization phenomenon induced by structural defects in the β-Ag2MoO4 crystals. Finally, photoluminescence properties at room temperature of β-Ag2MoO4 microcrystals were explained by the charge-transfer mechanism involving tetrahedral [MoO4] clusters.
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Affiliation(s)
- A F Gouveia
- LIEC- Universidade Federal de São Carlos , P.O. Box 676, 13565-905, São Carlos-SP, Brazil
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Marques VS, Cavalcante LS, Sczancoski JC, Paris EC, Teixeira JMC, Varela JA, De Vicente FS, Joya MR, Pizani PS, Li MS, Santos MRMC, Longo E. Synthesis of (Ca,Nd)TiO3 powders by complex polymerization, Rietveld refinement and optical properties. Spectrochim Acta A Mol Biomol Spectrosc 2009; 74:1050-1059. [PMID: 19819182 DOI: 10.1016/j.saa.2009.08.049] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2009] [Revised: 08/25/2009] [Accepted: 08/26/2009] [Indexed: 05/28/2023]
Abstract
Neodymium calcium titanate, (Ca(0.99)Nd(0.01))TiO(3) powders were synthesized by the complex polymerization method and heat treated at different temperatures for 2 h under air atmosphere. The structural evolution of these powders as a function of heat treatment temperature was analyzed by X-ray diffraction (XRD) and micro-Raman (MR) spectroscopy. The optical properties were investigated by Ultraviolet-visible (UV-vis) absorption spectroscopy and Photoluminescence (PL) measurements. XRD patterns, Rietveld refinement and MR spectra indicated that the powders heated treated at 750 degrees C for 2 h present an orthorhombic structure without secondary phases. UV-vis measurements suggested the presence of intermediary energy in disordered (Ca(0.99)Nd(0.01))TiO(3) powders. Broad and narrow bands were observed in the PL spectra of these powders when excited with 350 nm wavelength. The broad bands were associated to the structural defects and/or p-d electronic transitions while, the narrow bands were ascribed to f-f transitions arising from Nd(3+) ions.
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Affiliation(s)
- V S Marques
- CCN-Química, Universidade Federal do Piauí, 64049-550, Teresina, PI, Brazil
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Eliziário SA, Cavalcante LS, Sczancoski JC, Pizani PS, Varela JA, Espinosa JWM, Longo E. Morphology and Photoluminescence of HfO(2) Obtained by Microwave-Hydrothermal. Nanoscale Res Lett 2009; 4:1371-1379. [PMID: 20628455 PMCID: PMC2893942 DOI: 10.1007/s11671-009-9407-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Accepted: 07/22/2009] [Indexed: 05/11/2023]
Abstract
In this letter, we report on the obtention of hafnium oxide (HfO(2)) nanostructures by the microwave-hydrothermal method. These nanostructures were analyzed by X-ray diffraction (XRD), field-emission gum scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDXS), ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence (PL) measurements. XRD patterns confirmed that this material crystallizes in a monoclinic structure. FEG-SEM and TEM micrographs indicated that the rice-like morphologies were formed due to an increase in the effective collisions between the nanoparticles during the MH processing. The EDXS spectrum was used to verify the chemical compositional of this oxide. UV-vis spectrum revealed that this material have an indirect optical band gap. When excited with 488 nm wavelength at room temperature, the HfO(2) nanostructures exhibited only one broad PL band with a maximum at around 548 nm (green emission).
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Affiliation(s)
- SA Eliziário
- IQ-LIEC,
Universidade Estadual Paulista,
P.O. Box 355, 14801-907 Araraquara, SP
Brazil
| | - LS Cavalcante
- LIEC, Departamento de
Química e Física,
Universidade Federal de São Carlos,
P.O. Box 676, 13565-905 São Carlos,
SP Brazil
| | - JC Sczancoski
- LIEC, Departamento de
Química e Física,
Universidade Federal de São Carlos,
P.O. Box 676, 13565-905 São Carlos,
SP Brazil
| | - PS Pizani
- LIEC, Departamento de
Química e Física,
Universidade Federal de São Carlos,
P.O. Box 676, 13565-905 São Carlos,
SP Brazil
| | - JA Varela
- IQ-LIEC,
Universidade Estadual Paulista,
P.O. Box 355, 14801-907 Araraquara, SP
Brazil
| | - JWM Espinosa
- IQ-LIEC,
Universidade Estadual Paulista,
P.O. Box 355, 14801-907 Araraquara, SP
Brazil
| | - E Longo
- IQ-LIEC,
Universidade Estadual Paulista,
P.O. Box 355, 14801-907 Araraquara, SP
Brazil
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