Abstract
A simple and green route to synthesize hausmannite nanocrystals using tannic acid was presented in this work. Formation mechanism of Mn3O4 nanoparticles (NP’s) was illustrated. The Mn3O4 NP’s were characterized by X-ray powder diffraction studies (XRPD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transformed infrared spectroscopy (FT-IR), and high-resolution transmission electron microscopy. XRPD confirms the formation of Mn3O4 NP’s and the observation of peak at 632.81 cm−1 in Raman spectroscopy confirms the same. Mixed valency of Mn3O4 was evidenced from XPS. Also surface functionalization was evidenced by FT-IR and XPS measurements. The obtained NP’s are effective in degradation of tested organic pollutants methyl orange and bromophenol blue. About 90 % degradation in methyl orange and 80 % degradation in bromophenol blue were observed within 10 min using Mn3O4 NP’s. These NP’s show good antimicrobial activity against both tested gram-positive (Bacillus subtilis 168) and gram-negative (Escherichia coli K12) bacterias. The antibacterial activity of obtained Mn3O4 Np’s was found high in E. coli K12 than in B. subtilis 168.
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Acknowledgments
K. Mohan Kumar, S. Godavarthi, and M. Mahendhiran are thankful to the postdoctoral scholarship from Direccion General de Asuntos del Personal Academico—Universidad Nacional Autonoma de Mexico (DGAPA-UNAM). We are thankful to Dr. Ramón Peña Sierra from Cinvestav-IPN, for his support in Raman spectral analysis.
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Mohan Kumar, K., Godavarthi, S., Vázquez Vélez, E. et al. Green synthesis of hausmannite nanocrystals and their photocatalytic dye degradation and antimicrobial studies. J Sol-Gel Sci Technol 80, 396–401 (2016). https://doi.org/10.1007/s10971-016-4136-7
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DOI: https://doi.org/10.1007/s10971-016-4136-7