High yield synthesis and study of Cu substitution on characteristics and dielectric properties of MgO nanostructures

Desai, Prachi; Darji, Vaishnaviben J.; Deshpande, M. P.; Chaki, Sunil H.; Sutariya, Pinkesh G.; Soni, Heni; Solanki, P.S.; Shah, N.A.; Hirpara, Bharavi

doi:10.1016/j.matchemphys.2023.127499

Cited by 4 publications

(4 citation statements)

References 64 publications

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“…The crystallite size (D) was calculated using the Debye-Scherrer formula, and the microstrain (ε) was calculated for both samples using the Williamson-Hall equations [38,39]. The average crystallite size (D) and microstrain (ε) were determined to be 10.00 nm and 09.76×10 −3 for TiO 2 @AC-2, and 9.40 nm and 10.23×10 −3 for TiO 2 @AC-10, respectively.…”

Section: Xrd Analysismentioning

confidence: 99%

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Suchak,

Deshpande,

Mistry

et al. 2024

Phys. Scr.

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Activated carbon (AC) exhibits limited adsorption capacity for pollutants. Conversely, titanium dioxide (TiO2) demonstrates excellent photocatalytic performance, making it a popular choice for pollutant removal. This study investigates the removal of methylene blue (MB) dye from wastewater using AC, TiO2@AC-2, and TiO2@AC-10 samples via adsorption and photocatalysis. The Energy Dispersive analysis of X-rays (EDAX) has confirmed the presence of Ti, C and O in the prepared samples without any impurities. All the diffraction peaks in X-ray diffractograms indicated the presence of pure anatase TiO2 (tetragonal phase) with no evidence of any other phase. Fourier transform infrared spectroscopy (FTIR) analysis identified a peak around 545 cm⁻¹ in the TiO2@AC-2 sample, indicative of O-Ti-O stretching vibrations. This peak shifted to 602 cm⁻¹ in the TiO2@AC-10 sample. Raman spectroscopy confirmed the presence of carbon (D and G bands) at 1310-1347 cm⁻¹ and 1582-1597 cm⁻¹. Additionally, characteristic Raman active bands for anatase TiO2 were observed at 154 cm⁻¹ (Eg), 204 cm⁻¹ (Eg), 398 cm⁻¹ (B1g), 508 cm⁻¹ (A1g), and 628 cm⁻¹ (Eg). N2 adsorption-desorption isotherms revealed a mesoporous structure for all samples (AC, TiO2@AC-2, and TiO2@AC-10) with hysteresis loops, indicating pores ranging from 2 nm to 50 nm in diameter. Reflectance spectra of TiO2@AC-2 and TiO2@AC-10 displayed absorption edges at 368 nm and 385 nm, respectively, corresponding to a direct band gap of approximately 3.22 eV. Subsequently, these prepared samples were effectively employed for the removal of methylene blue (MB) dye from wastewater utilizing both adsorption and photocatalysis method. Under dark conditions, 20 mg/L doses of TiO2@AC-2 and TiO2@AC-10 resulted in 60% and 36% dye adsorption within 60 minutes respectively. In the presence of UV radiation, the degradation of dye was observed to be 74% and 95% by TiO2@AC-2 and TiO2@AC-10 respectively. This observation indicates that TiO2 nanoparticles along with AC leads to enhanced photocatalytic activity. The Langmuir-Hinshelwood model reveals lower rate constants for AC compared to the composite samples. This is likely because AC lacks inherent catalytic activity, requiring UV light to trigger adsorption. Conversely, TiO2@AC-10 exhibits the highest rate constants (K1 = 24.25 × 10-3 min⁻¹ and K2 = 82.71 × 10-3 min⁻¹), aligning with its higher TiO2 content confirmed by EDAX analysis. This suggests a significantly faster photocatalytic rate and superior degradation efficiency, even at a low sample concentration (20 mg/L).

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Section: Xrd Analysismentioning

confidence: 99%

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Suchak,

Deshpande,

Mistry

et al. 2024

Phys. Scr.

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“…This could be due to the diamagnetic character of the host Bi 2 S 3 and the exchange interaction in Fe x Bi 2-x S 3 nanostructures. When the Fe concentration is low, the small magnetic dipole moment on the surface of Bi 2 S 3 interacts with nearest neighbour particles, resulting in an exchange energy force that causes the dipoles to orient in the same direction, resulting in a high surface-to-volume ratio and enhanced magnetization [38]. This is followed till 6 wt% Fe which reflects from its saturation magnetization value of 127.50 emu gm −1 .…”

Section: Magnetic Property Measurement (Vsm Analysis)mentioning

confidence: 99%

“…2.2. Preparation of Fe x Bi 2-x S 3 (x = 0.0, 0.4, 0.6, and 0.8 wt%) nanostructure materials The reverse micelle method involves two-phase dispersion of oil and water in which water droplets are coated with the proper amount of surfactant [38]. This is achieved when two conditions are satisfied: one is [AOT] CMC of AOT and the second is the ratio of water to oil is less than 15 [36].…”

Section: Introductionmentioning

confidence: 99%

Probing the effect of lightly doped Iron in Bi₂S₃ nanostructures on Physiochemical properties and efficacy in anti-microbial activity

Darji,

Desai,

Deshpande

et al. 2023

Phys. Scr.

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In this study, Bi2S3 nanostructures doped with Iron (Fe) at various concentrations i.e., FexBi2-xS3 (x = 0.0, 0.4, 0.6, 0.8 wt%) were synthesized using the reverse micelle method. EDAX (Energy Dispersive Analysis of x-rays) has shown that the prepared samples are in stoichiometry without any kind of impurities. Rietveld refinement XRD (x-ray diffraction) pattern confirmed the orthorhombic crystal structure and showed good crystallinity of all the samples with increase in Fe content. The unit cell volume is found to be varied from 12.34 nm to 19.39 nm. HRTEM (High Resolution Transmission Electron Microscopy) has shown that the prepared nanostructures are nanorods and nanocylinders with high crystallinity and corroborates with our XRD results. Diffuse reflectance spectroscopy analysis indicated that the band gap has increased from 1.550 eV for pure Bi2S3 to 1.592 eV for Fe0.08Bi1.92S3 nanostructures reflecting the blue shift compared to bulk sample. The photoluminescence spectra (PL) recorded with 250 nm excitation wavelength for powder samples has shown that with increase in Iron concentration the intensity of 440 nm peak increases whereas the peaks at 470 nm and 510 nm decreases. The PL spectra is also recorded for nanostructures dispersed in liquid media and has shown that the peaks at 501 nm is observed while rest of the two peaks are quenched. Raman spectra dependent on temperature is obtained for FexBi2-xS3 (x = 0.0, 0.4, 0.6, 0.8 wt%) samples in pellet form in the range of 80 K to 280 K. All samples have shown B1g and Ag phonon modes with higher intensity. The Gruneisen parameter determined for B1g mode varies from 1.21 to 14.13 whereas for Ag mode it varies from 0.60 to 7.91 with the exception of a negative value of −3.10 for Fe0.06Bi1.94S3 sample. VSM (vibrating sample magnetometer) showed the diamagnetic behavior of Bi2S3 and ferromagnetic behaviour of FexBi2-xS3 (x = 0.0, 0.4, 0.6, 0.8 wt%) samples. The saturation magnetization is found to be reaching to a value of 127.5 emu gm−1 for 0.6 wt% of Fe doping in Bi2S3 and then decreases drastically to 40.34 emu gm−1 for 0.8 wt% Fe doping. The antibacterial efficacy showed that as Fe concentration increases, the MIC (minimal inhibitory concentration) fluctuates between 60 to 70 μg ml−1 and is found to be maximum for Fe0.08Bi1.92S3 sample. It is also found that Fe0.04Bi1.96S3 nanostructures show the lowest MIC value for Gram +ve and Gram –ve bacteria in comparison to Bi2S3 nanostructures.

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“…The spectral features below 300 cm −1 are attributed to the lattice modes.According to Ishikawa et. al, the weak band at about 280 cm −1 is due to a transverse acoustic (TA) phonon (Brillouin scattering) at the zone boundary of the nanostructure[49]. The Raman mode of transverse acoustic (TA) and transverse optical (TO) for MgO particles appears at 742 cm −1[50].…”

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confidence: 99%

Plant-Assisted Green Synthesis of MgO Nanoparticles as a Sustainable Material for Bone Regeneration: Spectroscopic Properties

Proniewicz,

Vijayan,

Surma

et al. 2024

IJMS

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This work is devoted to magnesium oxide (MgO) nanoparticles (NPs) for their use as additives for bone implants. Extracts from four different widely used plants, including Aloe vera, Echeveria elegans, Sansevieria trifasciata, and Sedum morganianum, were evaluated for their ability to facilitate the “green synthesis” of MgO nanoparticles. The thermal stability and decomposition behavior of the MgONPs were analyzed by thermogravimetric analysis (TGA). Structure characterization was performed by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS), and Raman scattering spectroscopy (RS). Morphology was studied by scanning electron microscopy (SEM). The photocatalytic activity of MgO nanoparticles was investigated based on the degradation of methyl orange (MeO) using UV-Vis spectroscopy. Surface-enhanced Raman scattering spectroscopy (SERS) was used to monitor the adsorption of L-phenylalanine (L-Phe) on the surface of MgONPs. The calculated enhancement factor (EF) is up to 102 orders of magnitude for MgO. This is the first work showing the SERS spectra of a chemical compound immobilized on the surface of MgO nanoparticles.

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High yield synthesis and study of Cu substitution on characteristics and dielectric properties of MgO nanostructures

Cited by 4 publications

References 64 publications

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Probing the effect of lightly doped Iron in Bi₂S₃ nanostructures on Physiochemical properties and efficacy in anti-microbial activity

Plant-Assisted Green Synthesis of MgO Nanoparticles as a Sustainable Material for Bone Regeneration: Spectroscopic Properties

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High yield synthesis and study of Cu substitution on characteristics and dielectric properties of MgO nanostructures

Cited by 4 publications

References 64 publications

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO2 nanoparticles with activated carbon

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO2 nanoparticles with activated carbon

Probing the effect of lightly doped Iron in Bi2S3 nanostructures on Physiochemical properties and efficacy in anti-microbial activity

Plant-Assisted Green Synthesis of MgO Nanoparticles as a Sustainable Material for Bone Regeneration: Spectroscopic Properties

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Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Kinetic study of adsorption and photocatalytic degradation of methylene blue dye using TiO₂ nanoparticles with activated carbon

Probing the effect of lightly doped Iron in Bi₂S₃ nanostructures on Physiochemical properties and efficacy in anti-microbial activity