Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine
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Precipitator concentration‑dependent opto‑structural properties of MgO nanoparticles fabricated using natural brine Sadegh Yousefi1 · Behrooz Ghasemi1 Received: 5 January 2020 / Accepted: 30 March 2020 © Springer Nature Switzerland AG 2020
Abstract In this paper, MgO nanoparticles (MNPs) were synthesized using simple wet chemical precipitation technique from evaporative brine as Mg ions precursor. The effect of NaOH concentration on morpho-structural and optical properties of as-synthesized nanoparticles was studied. The obtained nanoparticles were characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDS), fourier transform infrared spectroscopy and UV–Vis absorption spectroscopy. The obtained structural properties (from XRD analysis) indicated that MNPs had pure cubic phase, high crystallinity, and average crystallite size and were in good agreement with TEM and FESEM characteristics. Also, increasing the concentration of the precipitator resulted in reduced crystallites size (from 37.09 to 17.61 nm), nanoparticles size (from 35–88 nm to 22–75 nm), and strain value (from 1.23 × 10–3 to 0.57 × 10–3). The optical properties of MNPs including absorption (A), transmittance (T), absorption coefficient (α), optical band gap energy (Eg), Extinction coefficient (k), and refractive index (n) were investigated using UV–Vis spectroscopy and examined in details. Keywords Brine · MgO nanoparticles · Optical properties · UV–Vis spectroscopy · Band gap energy
1 Introduction Among the various nanoparticles, magnesium oxide (MgO) has attracted a large interest due to its unique applications in the catalyst, remove of toxic species from wastewater, refractory products, paint, antibacterial materials, superconductor materials, plasma display panels (PDP) and other optical fields [1–3]. Different physicochemical methods have been developed such as sol–gel, chemical gas phase deposition, laser vaporization, hydrothermal, microwave enhanced precipitation, aqueous wet chemical and surfactant method, and polyol-mediated thermolysis are widely used for the synthesis of MNPs with special morpho-structural, optical properties [4]. Performed studies indicated that the morphology and characteristics (including optical, thermal, and etc.) of MNPs can be affected by the synthesis method and the process conditions such as,
the reaction’s temperature, precipitator agent’s concentration, magnesium’s concentration, type and concentration of the dispersing agent, suspension aging temperature and calcination’s time and temperature [5]. In recent years, the optical properties of magnesium oxide nanostructures have found a special place among researchers and papers have been published in this field. Al-Ghamdi et al. [6] synthesized ultrafine MgO cubic facecentered nanowires with a mean diameter of 10 nm and a mean length of 18–20 μm. The UV–Vis characterization of these nanoparticles indicated a raised absorption peak in the low wavelength
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