Adsorption of arsenic (III) by a novel adsorbent prepared from Ocimum sanctum

An economic novel alternative choice for chemical and physical methods for nanoparticles synthesis is green method. Green nano zinc adsorbent (ZnO-NPs-AS-Os) embedded with activated silica is synthesized from the aqueous leaf extract of Ocimum sanctum using Zinc acetate dihydrate and sodium hydroxide. The phytoconstituents present in the leaf extract is responsible for the formation, capping and stabilization of adsorbent (ZnO-NPs-AS-Os). The adsorbent is characterized by SEM for its morphology, XRD for its crystallinity, EDAX for its elemental constitution and FT- IR for phytocostituents present. The results confirmed the formed nano needle shaped adsorbent of 200nm is effective in removing As(III) ions from aqueous solution

A Facile Method of Synthesis and Characterization of Sr Doped CeO2 Nanocrystalline Materials

Strontium doped Cerium oxide (Ce1-0.25Sr0.25O2 and Ce1-0.5Sr0.5O2) nanocrystals were synthesized by combustion technique. The synthesized (Ce1-xSrxO2, x = 0.25, 0.5) nanocrystals were annealed at 500° C for 2hr. The phase formation, surface morphology and elemental composition analysis have been studied using XRD, HRSEM and EDXS. XRD and HRSEM measurements revealed that the synthesized nanocrystals were in single phase with face-centered cubic (fcc) structure and that the nano-grains had different sizes. Chemical composition was confirmed using EDXS. The UV-Vis spectroscopic studies revealed that as the Sr doping level increases, the band gap width increases from Eg = 2.9 eV to 2.95 eV. At the same time, the wavelength of maximum absorbance shifts from λabs = 285 to 300 nm. Further, PL studies were performed with excitation wavelength λ = 350 nm and two main emission peaks were observed at 415 and 437 nm respectively. TGA, DTA and DSC measurements were carried out to check the weight loss and the occurrence of endothermic/exothermic reaction

Electrochemical performance of plant trace element incorporated silver nanoparticles synthesis from Datura metel L.

In our report, silver nanoparticles (AgNPs) were prepared from the leaf extract of Datura metel L. via the green synthesis method. Datura metel L. is a herbal medicinal plant from the Solanaceae family. The as‐prepared AgNPs were characterized using UV‐Vis spectrometer, X‐ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) with Energy Dispersive X‐ray (EDAX) analysis. The peak appearance of a Surface Plasmon Resonance (SPR) at 415 nm suggested the creation of AgNPs in the UV‐Vis spectrum. The XRD pattern showed the face‐centered cubic crystal structure of AgNPs with organometallic complex phase. Based on the FTIR spectrum, the peaks revealed the existence of biomolecules. SEM images showed the shape of the clastic rocks and the EDAX profile authenticated the presence of Ag and plant trace element. The cyclic voltammetry, Chronopotentiometry, and electrochemical impedance spectroscopy analysis were performed on an as‐prepared Ag electrode. A specific capacitance of 267.59 F/g at 0.5 A/g and a cyclic retention of 83.7% after 5000 charge‐discharge cycles were obtained. Hence, this material could be utilized in supercapacitor energy storage devices

Interacting Bose gas confined by an external potential

Interacting Bose gas confined by an external potential is studied using Green functions in spectral representation. The calculation is presented transparently using the equation of motion method. With this, the interplay between the condensed and the non-condensed atoms is inevitably seen. An expression for the condensate number at finite temperature is obtained in the lowest and first orders, from which depletion of bosons from the ground state is qualitatively analyzed. Finally, we discuss the behaviour of the specific heat of a trapped interacting Bose gas in the quasi-continuum limit

Collective Modes of Trapped Interacting Bosons

The derivation for collective modes of an interacting Bose gas trapped by an isotropic harmonic oscillator potential is presented using field-theoretic method. The presence of the two-body scattering term beyond the mean-field is seen to appear inevitably in the calculations, even in the simplest approximation. As a result we see the occurrence of a small number of non-condensate atoms in the ground state density fluctuations

Depletion of Harmonically Confined, Interacting Bose Atoms from the Ground State

The macroscopic occupation of atoms in the ground state of an interacting Bose gas confined by an external harmonic potential is calculated as a function of the interaction strength. The effect of the inter-atomic interaction to the ground state distribution is discussed

A Facile Method of Synthesis and Characterization of Sr Doped CeO₂Nanocrystalline Materials

700-705Strontium doped Cerium oxide (Ce1-0.25Sr0.25O2 and Ce1-0.5Sr0.5O2) nanocrystals were synthesized by combustion technique. The synthesized (Ce1-xSrxO2, x = 0.25, 0.5) nanocrystals were annealed at 500° C for 2hr. The phase formation, surface morphology and elemental composition analysis have been studied using XRD, HRSEM and EDXS. XRD and HRSEM measurements revealed that the synthesized nanocrystals were in single phase with face-centered cubic (fcc) structure and that the nano-grains had different sizes. Chemical composition was confirmed using EDXS. The UV-Vis spectroscopic studies revealed that as the Sr doping level increases, the band gap width increases from Eg = 2.9 eV to 2.95 eV. At the same time, the wavelength of maximum absorbance shifts from λabs = 285 to 300 nm. Further, PL studies were performed with excitation wavelength λ = 350 nm and two main emission peaks were observed at 415 and 437 nm respectively. TGA, DTA and DSC measurements were carried out to check the weight loss and the occurrence of endothermic/exothermic reactions

Y3+ and Sm3+ co-doped mixed metal oxide nanocomposite: Structural, electrochemical, photocatalytic, and antibacterial properties

Nanocomposite materials (rare-earth doped) are famous and tend to demonstrate good features in all the fields like photocatalysis, electrochemical, and antibacterial. A Wet-chemical route was used to prepare NiO-CYO-CSO [NiO-Ce0.9Y0.1O2-δ–Ce0.9Sm0.1O2-δ] nanocomposite successfully for different uses. The growth of fluorite cubic structure and absence of secondary phase was detected by X-ray diffraction. Metal-oxygen bond at 410.7 cm−1 was unveiled by Fourier transform infrared spectroscopy. The morphology and element composition of the material was characterized using Scanning electron microscopy and Energy dispersive absorption X-ray spectroscopy. The optical bandgap of the sample was deliberated using UV-Vis spectroscopy and the projected bandgap of NiO-CYO-CSO composite was found to be 3.54 eV. Impedance studies were done at conditions such as the frequency range (40  to 6 kHz) and voltage-1.3 V. The photocatalytic and antibacterial activities of NiO-CYO-CSO nanocomposite was also examined. Furthermore, the synthesized NiO-CYO-CSO will apply to wastewater treatment and pharmaceutical applications