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Nobre FX, Bastos IS, Dos Santos Fontenelle RO, Júnior EAA, Takeno ML, Manzato L, de Matos JME, Orlandi PP, de Fátima Souza Mendes J, Brito WR, da Costa Couceiro PR. Antimicrobial properties of α-Ag 2WO 4 rod-like microcrystals synthesized by sonochemistry and sonochemistry followed by hydrothermal conventional method. Ultrason Sonochem 2019; 58:104620. [PMID: 31450327 DOI: 10.1016/j.ultsonch.2019.104620] [Citation(s) in RCA: 13] [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: 11/29/2018] [Revised: 05/24/2019] [Accepted: 05/28/2019] [Indexed: 05/29/2023]
Abstract
In this study we report the synthesis of silver tungstate microcrystals (α-Ag2WO4) by sonochemistry method (SC) at 65 °C and sonochemistry followed by conventional hydrothermal (SC + HC) for 1, 6 and 12 h, at 140 °C. The structural characterization by XRD confirms the alpha phase of the orthorhombic structure and the space group Pn2n, for all synthesized microcrystals. All the actives modes identified at the Raman spectroscopy were characteristic of alpha phase. The optical band gap by UV-Vis spectroscopy using the diffuse reflectance were 2.98, 3.0, 2.99 and 2.96 eV, for the microcrystals SC, SC + HC-1 h, SC + HC-6 h and SC + HC-12 h, respectively. FE-SEM images show the rod-like microcrystals, however, exhibiting the plane surface (1 0 1) only for the synthesized microcrystals with the assistance of the hydrothermal method (SC + HC-1 h, SC + HC- 6 h and SC + HC-12 h). The antimicrobial potential was confirmed for all α-Ag2WO4 microcrystals synthesized. However, the SC + HC-12 h microcrystals were more susceptible in the bacterial and fungal inhibition, with MIC values for microorganisms C. albicans, T. rubrum, MRSA e EHEC, 0.2-0.5, 4-9, 250 and 31.25 μg mL-1, respectively.
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Affiliation(s)
| | | | | | - Edgar Alves Araújo Júnior
- Laboratório Interdisciplinar de Materiais Avançados, Universidade Federal do Piauí, Teresina 64049-550, Amazonas, Brazil
| | - Mitsuo Lopes Takeno
- Instituto Federal do Amazonas, Campus Manaus Distrito Industrial, 69075-000 Amazonas, Brazil
| | - Lizandro Manzato
- Instituto Federal do Amazonas, Campus Manaus Distrito Industrial, 69075-000 Amazonas, Brazil
| | - José Milton Elias de Matos
- Laboratório Interdisciplinar de Materiais Avançados, Universidade Federal do Piauí, Teresina 64049-550, Amazonas, Brazil
| | | | | | - Walter Ricardo Brito
- Laboratório de Fisico-Química, Universidade Federal do Amazonas, Manaus 69077-000, Amazonas, Brazil
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