Well-designed beta-Ag2MoO4 crystals with photocatalytic and antibacterial activity

Materials & Design Volume: 115 Pages: 73-81 Published: 2017

Proposed RhB photodegradation and microbial cell inactivation mechanisms based on the semiconductor band gap structure and electron–hole pair cluster-to-cluster transference in β-Ag2MoO4.

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Writers: Cibele A. Oliveira and Diogo P. Volanti and André E. Nogueira and Camila A. Zamperini and Carlos E. Vergani and Elson Longo

Keywords: Silver molybdate; Photodegradation; Antibacterial; Multifunctional; Crystal growth

Abstract: This paper describes the beta silver molybdate (β-Ag2MoO4) samples with spinel-type cubic structures synthesized with various morphologies, including round tips coral-like, elongated coral-like and truncated cube, by the microwave-assisted solvo-/hydrothermal method. The crystal morphologies could be controlled by adjusting the solvent, surfactant, and pH of the precursor solution. X-ray diffraction, field-emission scanning electron microscopy, Fourier-transform Raman spectroscopy, and diffuse reflectance spectroscopy in the ultraviolet-visible (UV–Vis) region, were used to characterize the structures of the samples. The specific surface area was determined using the Brunauer–Emmett–Teller method. Furthermore, the photocatalytic/antibacterial properties of the particles were dependent on the β-Ag2MoO4 crystal morphogy and were evaluated by Rhodamine B dye photodegradation under UV–Vis light, and by determining their minimum inhibitory and bactericidal concentrations, using a broth microdilution assay for Escherichia coli bacteria.

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