Photocatalytic Studies of MgO Nano Powder; Synthesized by Green Mediated Route (original) (raw)
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Photoluminescence and photocatalytic activity of MgO powders
Materials Chemistry and Physics, 1988
Nanocrystalline ZnO particles doped with Mn(II) ions were prepared by a forced hydrolysis method of zinc acetate dihydrate and manganese acetate tetrahydrate, under reflux, in buthanol. The precipitate obtained was separated by centrifugation at 9.000 rpm and purified by refluxing in water. The dopant percentage was 1, 2.5 and 5%. The qualitative composition of the nanopowder has been evidenced in the elemental EDS maps. Optical investigation shows that the Mn doping in ZnO lattice leads to a decrease in the near band edge position due to the introduction of new unoccupied states by Mn 3d electrons. The luminescence of ZnO is quenched by increasing the dopant ions percentage. At doping rate of 1% Mn in the ZnO lattice a tenfold decrease in intensity of luminescence was observed, along with modification of the luminescence pattern. Further increases of dopant percent from 1% to 5% had as result a decrease of only 30% in the luminescence intensity. The photocatalytic activity was investigated against methylene blue. The increase of Mn percentage leads to a better photocatalytic activity.
Microstructure, optical and photocatalytic properties of MgO nanoparticles
Results in Physics, 2020
The present work is focused on the synthesize of MgO nanoparticles using combustion method. The magnesium nitrate is used as a precursor with urea as a fuel. The precursor material is dissolved in 50 ml DI water along with the fuel and the solution is heated at 80°C for 2 h. Then, the solution is transferred to crucible and kept it in the temperature of 500°C. The as-synthesized MgO nanopowders are analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), photo-luminescence (PL) and photocatalytic studies. The XRD results of MgO nanoparticles indicated the cubic structure with the crystallite size of 27 nm. The FESEM studies indicated the formation of MgO crystallites in spherical shape. In addition, MgO nanoparticles are porous and agglomerated. PL spectrum of MgO materials exhibit emission peaks, which indicates the occurrence of band to band transition with the bandgap of 2.9 eV. The photocatalytic degradation of methylene blue dye is evaluated using the as-prepared MgO nanoparticles under UV light. The photocatalytic studies indicate the 75% degradation efficiency of the catalyst after 120 min irradiation. Hence, the MgO Nanoparticles (NPs) can be used for the treatment of effluents from the dye industries .
Physica B: Condensed Matter, 2020
In the current study, pure MgO nanostructures in the presence of Oleic acid (OA) with 0.2 cc , 0.4 cc , 0.6 cc , 0.8 cc and 1 cc as a capping agent were successfully prepared using the ultrasound-assisted method. The effect of the OA concentration on the structural, morphological, optical and porosity properties of prepared nanocomposite materials were studied by Thermogravimetric-differential thermal analysis (TGA-DTA), Field Emission Scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), Energy Dispersive X-ray spectroscopy (EDX), UV-Vis spectra and BET (Brunauer, Emmett and Teller). Photocatalytic activity of MgO and OA-doped MgO nanostructures were checked by the degradation of methylene blue (MB) under visible light at optimum pH value. Obtained results show that between samples with different concentrations of OA, the MgO-0.6 cc OA nanostructures showed the highest degradation performance and decompose 99% of MB at 25 min.
Enhanced Photocatalytic Decomposition Efficacy of Novel MgO NPs: Impact of Annealing Temperatures
Journal of Inorganic and Organometallic Polymers and Materials, 2021
The magnesium oxide (MgO) nanoparticles (NPs) were prepared using the sol-gel method and the prepared nanoparticles were annealed at different temperatures (500, 600, and 700 °C). The prepared nanoparticles were characterized using X-ray diffraction (XRD) for the structural analysis (Rietveld refinement), SEM for surface morphological analysis, and the energy dispersive X-ray analysis for elemental compositional analysis. The detailed structural analyses proved the expansion of the unit cell by increasing the annealing temperature. The detailed electronic bonding behavior and the expansion of the unit cell of the prepared nanoparticles were analyzed and reported using the maximum entropy method (MEM). The light absorption behavior of the MgO was probed using UV-Vis-NIR spectroscopic analysis. The photocatalytic decomposition capabilities of the synthesized MgO nanoparticles were studied against a model pollutant such as methylene blue dye. The maximum photocatalytic efficiency of 92% in 150 min was observed for MgO nanoparticles annealed at 700 °C.
Present work focus onsynthesis of ZnO and MgO nanoparticles (NPs) by curry leaves through Green approach. This method is non-toxic and eco-friendly. The curry leaves extract acting as a reducing agent in thereaction. The biosynthesized NPs were characterized by different analytical techniques. X-Ray Diffractometer (XRD) for to calculate the average crystalline size, Particle Size Analyser for average particle size, Scanning Electron Microscope (SEM) for morphological studies, UV-Visible spectroscopy (UV-Vis)for to analyze the absorption patterns.The NPs exhibit potential photocatalytic activity towards the degradation of methylene blue (MB) and Methyl red(MR)dye upon exposure to UV light. The study successfully shows a simple and eco-friendly method forthe synthesis of efficient multifunctional ZnO/MgONPs using green synthetic approach. Photocatalytic property of the ZnO/MgO NPs wereexamined by photo degradation of MB and MR under UV illumination. The biosynthesized nanoparticles showed photocatalytic activity under the UV light enhancing the degradation rate of methylene blue (MB) and Methyl red(MR), which is one of the main water-pollutant released by textile industries. The study successfully demonstrates synthesis of ZnO/MgO NPs by simple ecofriendly route usingCurry leaves as fuel that exhibit superior photo catalytic activity.
2015
Mg2+ doped hexagonal ZnO nanoparticles with different Mg2+contents (0%, 1%, 2%, 3%,4%, 5%, 10%, 15%, 20% and 25%) were prepared from oxalate precursors synthesized by direct reaction in the solid state between oxalic acid dihydrate (H2C2O4.2H2O), nitrate salts of zinc (Zn(NO3)2.6H2O) and magnesium (Mg(NO3)2.6H2O) at 150 °C. The resulting precursors were subsequently calcined at 500 °C to produce the corresponding oxides. In addition, the oxalates of the single metals were also prepared by heating at 180 °C to dehydrate the complexes, before using TGA thermal gravimetric analysis to determine the temperature range of the decomposition. The obtained oxides were characterized using X-ray Diffraction (XRD), Brunauer–Emmett–Teller technique (BET), transmission electron microscopy (TEM) and tested as photocatalysts in the degradation of methylene blue (MB) under UV irradiation. The results show a segregation of phases starting at an Mg2+ content of 10%. The crystallites' sizes, calcul...
MgO nanomaterials with different morphologies and their sorption capacity for removal of toxic dyes
MgO nanorods, hierarchical nanostructures and nanoflakes were synthesized by precipitation, reflux and hydrothermal methods, respectively. The SEM and FESEM images suggested the formation of nanorods with diameter around 400-500 nm, hierarchical nanostructures containing plates with thickness around 100-200 nm and nanoflakes with diameter around 300-500 nm. XRD and FTIR confirmed the formation of single phase MgO with well crystalline nature. The hierarchical MgO nanostructures possessed higher specific surface area (147.5 m 2 /g) than MgO nanorods (48.45 m 2 /g) and nanoflakes (110.9 m 2 /g). The prepared nanomaterials were used as adsorbents to remove organic dyes such as Malachite green and Congo red from aqueous media. The percentage of removal of Malachite green by MgO nanorods, hierarchical nanostructures and nanoflakes are 95.1, 99.98 and 97.42%, respectively, and percentage of removal of Congo red by MgO nanorods, hierarchical nanostructures and nanoflakes are 86.28, 99.94 and 92.68%, respectively. The hierarchical MgO nanostructure exhibited excellent adsorption performance for removal of Malachite green and Congo red with maximum sorption capacities of 1205.23 and 1050.81 mg/g, respectively.
Applied Catalysis A: General, 2015
ZnO nanomaterials of different morphologies are synthesized by different methodologies. These semiconductor photocatalysts are potentially explored for self-sensitized photodegradation of malachite green (MG) dye in water in a batch reactor. The effects of various parameters like initial dye concentration, catalyst loading, solution pH, light source on degradation efficiency was also investigated. The experimental results showed substantial reduction of COD, besides removal of colour. The photodegradation of MG dye followed the pseudo first order kinetics of Langmuir-Hinshelwood model. The hydrothermally synthesized flower shaped homocentric pencil like ZnO nanorod bundles exhibit excellent photocatalytic activity under solar light. A comparative study of photodegradation efficiency among ZnO nanoparticles, ZnO nanoparticles (hydrothermal) and flower shaped homocentric pencil like ZnO nanorod bundles were also performed. Semiconductor photocatalysis often leads to partial or complete mineralization of organic pollutants. The CO 2 gas evolved due to mineralization of MG was determined using Warburg manometric method under solar light. The possible mechanism of photodegradation under both solar and UV light were also proposed.
Synthesis, Analysis, and Photocatalysis of Mg-Doped ZnO Nanoparticles
Russian Journal of Inorganic Chemistry, 2019
Mg-doped ZnO nanoparticles with different contents of Mg dopant have been synthesized by tartaric acid complex method with subsequent calcination at 600°C for 2 h. The products have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The analytical results have revealed the presence of wurtzite ZnO with hexagonal structure for undoped and Mg-doped samples with particle sizes of 100-200 nm for ZnO and 30-70 nm for 5 wt % Mg-doped ZnO. Visible light driven photocatalytic properties of ZnO and Mg-doped ZnO have been monitored through photodegradation of methylene blue (MB) identified by liquid chromatography-mass spectrometry (LC-MS). In this research, 5 wt % Mg-doped ZnO have shown the highest photocatalytic activity of 99% within 60 min.
Synthesis of Mg- TiO 3 Nanoparticles for Photocatalytic Applications
Magnesium titanate (MgTiO 3) has been successfully synthesized via the sonochemical method by using TiO 2 (P25) and Magnesium nitrate (MgNO 3) 2 .6H 2 O as precursors without any additional phases such as MgTi 2 O 5 and Mg 2 TiO 4. The synthesized nanoparticles were well characterized by optical methods using UV-Vis diffuse reflectance spectroscopy (DRS) and Photo-luminescence spectroscopy (PL). The morphology of MgTiO 3 nanoparticles is irregular in shape with serious agglomerations were confirmed through SEM analysis. XRD confirms crystal structure and phase purity of MgTiO 3 nanoparticles calcined at 700°C for 2 hours. The calculated band gap energy of MgTiO 3 nanoparticles has been found to be 3.05 eV. Using the prepared MgTiO 3 nanoparticles, the photocatalytic activities were evaluated by following the degradation of Congo red dye under visible light. Moreover, the influence of various scavengers on the photocatalytic reaction were studied.