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Beilstein Arch. 2024, 202459. https://doi.org/10.3762/bxiv.2024.59.v1
Published 11 Sep 2024
Raw smectite clay (SM) sourced from the Guarapuava region, Brazil, underwent modification with niobium oxide (SMOx) and niobium phosphate (SMPh) to act as adsorbent and photocatalyst in the remediation of wastewater containing methylene blue (MB) dye. Additionally, these materials were evaluated for their potential as antibacterial hybrid pigments. The characterization of the SM, SMOx, and SMPh samples was conducted using various analytical techniques to assess the modifications induced by the incorporation of niobium compounds into the clay matrix and to evaluate the colorimetric properties and dye removal efficiency. Notably, X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), and laser-induced breakdown spectroscopy (LIBS) were used to detail characterization. The results indicate successful modification of SM through the intercalation of niobium oxide and niobium phosphate within the interlayer spaces of the clay structure. Following characterization, the SMOx and SMPh samples were used for the treatment of solutions containing methylene blue at 25 oC. The initial concentration was 400 mg L-1. Subsequently, the efficacy of the dye removal was assessed using the minimum inhibitory concentration (MIC) assay against two bacteria strains: Bacillus cereus (ATCC 10876) and Proteus mirabilis (ATCC 35649). The analysis revealed remarkable antibacterial activity against Proteus mirabilis, suggesting a preferential selectivity for Gram-negative bacteria.
Keywords: Smectite; niobium; adsorption; photocatalysis; hybrid pigment
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Jaerger, S.; Appelt, P.; da Cunha, M. A. A.; Ayma, F. C.; Schneider, R.; Bittencourt, C.; Anaissi, F. J. Beilstein Arch. 2024, 202459. doi:10.3762/bxiv.2024.59.v1
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