Synthesis, characterization and anti-bacterial activities of pure and Co-doped BaSO4 nanoparticles via chemical precipitation route

Sivakumar, S.; Soundhirarajan, P.; Arul, Venkatesan; Khatiwada, Chandra Prasad

doi:10.1016/j.saa.2014.08.080

Cited by 17 publications

(3 citation statements)

References 25 publications

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“…The absorptions induced by the 365 nm external illumination for BaSO 4 under different gaseous environments are shown in Figure . A 365 nm illumination is not expected to generate any excited charge carriers in BaSO 4 due to its extremely large band gap corresponding to ∼200–300 nm; , therefore, the ideal photoinduced absorption spectrum should be a straight line at 0% under all presently introduced gases. The spectra in Figure slightly deviate from the ideal 0% line due to noise and small instrumental drifts/errors.…”

Section: Resultsmentioning

confidence: 99%

In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy

et al. 2021

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The intrinsic behavior of photogenerated charges and reactions with chemicals are key for a photocatalytic process. To observe these basic steps is of great importance. Here we present a reliable and robust system to monitor these basic steps in powder photocatalysts, and more importantly to elucidate the key issue in photocatalytic methane conversion over the benchmark catalyst TiO 2 . Under constant excitation, the absorption signal across the NIR region was demonstrated to be dominated by photoexcited electrons, the absorption of photoexcited holes increases toward shorter wavelengths in the visible region, and the overall shapes of the photoinduced absorption spectra obtained using the system demonstrated in the present work are consistent with widely accepted transient absorption results. Next, in situ measurements provide direct experimental evidence that the initial step of methane activation over TiO 2 involves oxidation by photoexcited holes. It is calculated that 90 ± 6% of photoexcited electrons are scavenged by O 2 (in dry air), 61 ± 9% of photoexcited holes are scavenged by methane (10% in argon), and a similar amount of photoexcited electrons can be scavenged by O 2 even when the O 2 concentration is reduced by a factor of 10. The present results suggest that O 2 is much more easily activated in comparison to methane over anatase TiO 2 , which rationalizes the much higher methane/O 2 ratio frequently used in practice in comparison to that required stoichiometrically for photocatalytic production of value-added chemicals via methane oxidation with oxygen. In addition, methanol (a preferable product of methane oxidation) is much more readily oxidized than methane over anatase TiO 2 .

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Section: Resultsmentioning

confidence: 99%

In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy

et al. 2021

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“…The identification of cell membrane proteins in the extracellular matrix has previously shown that most nanoparticles target the cell membrane of the bacterium [17]. Sivakumar et al [32] conducted a study in which they synthesized barium nanoparticles using the chemical precipitation method. The antibacterial activity suggests that the particles may interfere with Gram-positive and Gram-negative bacterial transporter, dehydrogenase, and periplasmic enzymatic activities.…”

Section: Antibacterial Analysismentioning

confidence: 99%

Multifunctional Spirogyra-hyalina-Mediated Barium Oxide Nanoparticles (BaONPs): Synthesis and Applications

Abdullah,

Rahman,

Faisal

et al. 2023

Molecules

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This research aims to biosynthesize Barium oxide nanoparticles (BaONPs) for biomedical applications, using Spirogyra hyalina as a stabilizing and reducing agent. UV–visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to physiochemically characterize the barium oxide nanoparticles, while antibacterial, minimum inhibitory concentration, antifungal, free radicle scavenging, and anti-inflammatory assay were performed to assess the therapeutic potential of the synthesized BaONPs. Fourier transform infrared spectroscopy revealed bands at 615 and 692 cm−1 that corresponded to the formation of BaONPs. Scanning electron microscopy revealed the spherical and flower-shaped morphology of BaONPs having an average diameter of 64.01 ± 2.0 nm. Both Gram-positive and Gram-negative bacterial growth was halted by the barium nanoparticles, demonstrating their efficacy up to 19.12 ± 0.31 mm against E. coli, 18.83 ± 0.44 mm against Klebsiella pneumoniae, 17.31 ± 0.59 mm against P. aeruginosa, 16.56 ± 0.37 mm against S. aureus, and 15.75 ± 0.38 mm against S. epidermidis, respectively. The minimum inhibitory concentration was 9.0, 6.3, 5.5, 4.5, and 2.0 µg/mL for S. aureus, Klebsiella pneumoniae, S. epidermidis, P. aeruginosa, and E. coli, respectively. BaONPs were not that effective against fungal strains such as Rhizoctonia solani, Fusarium solani, and Fusarium proliferatum. The BaONPs exhibited potent anti-inflammatory and antioxidant activity through inhibiting cyclooxygenases type 1 (43.12 ± 1.21%) and 2 (41.23 ± 1.56%), and DPPH free radicles up to 43.52 ± 0.29% at 400 µg/mL. In conclusion, the biomolecules derived from Spirogyra hyalina have demonstrated remarkable ability to generate stable nanoparticles, offering promising prospects for their utilization as therapeutic agents and coating materials in various biomedical applications.

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“…The BaSO 4 show quickly processed and similar protective ability to lead due to a high photon attenuation coefficient (linear and mass attenuation coefficient), effective atomic number, and good electron density. Based on these specifications, BaSO 4 would be an excellent choice to protect against radiation 35 – 37 . As for Fe 3 O 4 , it is good to increase the attenuation of electromagnetic waves, both electrical and magnetic properties 38 .…”

Section: Introductionmentioning

confidence: 99%

Composites cement/BaSO4/Fe3O4/CuO for improving X-ray absorption characteristics and structural properties

Gharissah

Ardiansyah

Pauziah

et al. 2022

Sci Rep

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Composite cement/BaSO4/Fe3O4/CuO with a thickness of 0.6 cm for various amounts of CuO: 2 wt%, 4 wt%, 6 wt%, and 8 wt% were successfully synthesized for the X-ray radiation shield. The bonding characteristics of composite and structural properties were determined using Fourier transform infrared spectra for the wavelength range of 4000–400 cm−1 and X-ray diffraction with the range of 2θ from 25° to 50°, respectively. The shielding ability was measured using a mobile X-ray with an energy of 55, 66, and 77 keV for determining the mass and linear attenuation coefficient, electronic and atomic cross-section. These shield characteristics best agreement with theoretical calculation from the XCOM database for energy < 77 keV with half value layer (HVL) < 0.3 cm. The best shielding in this study indicated by the lowest HVL and MFP is composite for CuO 8 wt%. The HVL and MFP shows better values compared to the previous reported using composite rubber-based, indicated high potentials composite in this study for design new and efficient radiology rooms as an alternative concrete, especially for X-ray radiation, in the future.

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Synthesis, characterization and anti-bacterial activities of pure and Co-doped BaSO4 nanoparticles via chemical precipitation route

Cited by 17 publications

References 25 publications

In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy

In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy

Multifunctional Spirogyra-hyalina-Mediated Barium Oxide Nanoparticles (BaONPs): Synthesis and Applications

Composites cement/BaSO4/Fe3O4/CuO for improving X-ray absorption characteristics and structural properties

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Synthesis, characterization and anti-bacterial activities of pure and Co-doped BaSO4 nanoparticles via chemical precipitation route

Cited by 17 publications

References 25 publications

In Situ Investigation of Charge Performance in Anatase TiO2 Powder for Methane Conversion by Vis–NIR Spectroscopy

In Situ Investigation of Charge Performance in Anatase TiO2 Powder for Methane Conversion by Vis–NIR Spectroscopy

Multifunctional Spirogyra-hyalina-Mediated Barium Oxide Nanoparticles (BaONPs): Synthesis and Applications

Composites cement/BaSO4/Fe3O4/CuO for improving X-ray absorption characteristics and structural properties

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Product

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In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy

In Situ Investigation of Charge Performance in Anatase TiO₂ Powder for Methane Conversion by Vis–NIR Spectroscopy