Date pits extracts assisted synthesis of magnesium oxides nanoparticles and its application towards the photocatalytic degradation of methylene blue

Sackey, J.; Bashir, A.K.H.; Ameh, Alechine E.; Nkosi, M.; Kaonga, Chikumbusko Chiziwa; Mâaza, M.

doi:10.1016/j.jksus.2020.06.013

Cited by 45 publications

(9 citation statements)

References 24 publications

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“…Two strong absorbance peaks are seen at 285 and 330 nm. These prominent peaks are indicative of the presence of phenolicand flavonoids [53]. As stated in the introduction, phenolicand flavonoid are identified in Ipomoea batatas L. and thus considered as reducing agents in synthesis of Cr 2 O 3 nanoparticles.…”

Section: Optical Analysismentioning

confidence: 89%

Bio-synthesised black α-Cr2O3 nanoparticles; experimental analysis and density function theory calculations

Sackey

Morad

Bashir

et al. 2021

Journal of Alloys and Compounds

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A selective single phase black a-Cr 2 O 3 nanoparticles was bio-synthesised via simple straight-forward green synthesis approach. The process involves extraction of phytochemicals contained in peels of sweet potatoes. Extraction was done in distilled water under constant magnetic stirring at a temperature of 70e80 C resulting in a dusty yellow colour aqueous extracts. Afterwards, chromic nitrate salt was added to extracts resulting in reduction of metal salt to metal nanoparticles. Obtained precipitates were dried and annealed in the air for 2 h ready to be applied without further post synthesis modifications. SEM and EDS analysis of annealed precipitates reveal distinct shapes and high purity of nanoparticles. The effects of the annealing temperature are evident in the nanoparticle sizes. SAED and XRD patterns expose bright diffraction peaks which are harmonized to the rhombohedral structure of pure Eskolaitea-Cr 2 O 3. By quantitative analysis of XRD data, it was noted that lattice parameters and crystal sizes slightly decrease w.r.t increase annealing temperature. Raman spectra recorded peaks ascribe to vibrations in A 1g and E g mode whereas FTIR analysis show absorption bands at 641 and 632 cm À1 which evidence the presence of a-Cr 2 O 3 nanoparticles. UVeVis absorbance peak generated Cr 2 O 3 nanoparticles are observed at 402 nm yielding a band gap of 3.08eV. Magnetism results of a-Cr 2 O 3 nanoparticles shows linear increase upon field increasing, which can be elucidated by the existing of uncompensated spins at the surface of the nanoparticles that may lead to nonmagnetic or antiferromagnetic state. Zero field cooling (ZFC) results of a-Cr 2 O 3 nanoparticles were analysed based on Curie-Wien relation which yield values of magnetic moment (m eff ) of the synthesised Cr 2 O 3 nanoparticles close to the value that was assigned for Cr 2þ. The density functional theory (DFT) with the PW91, PBE, PBESOL and a Hubbard U Coulomb interactionwas utilized to study the optimum structure, electronic and magnetic properties of antiferromagnetically ordered Cr 2 O 3 . The computed results are consistent with the experimental measurements.

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Section: Optical Analysismentioning

confidence: 89%

Bio-synthesised black α-Cr2O3 nanoparticles; experimental analysis and density function theory calculations

Sackey

Morad

Bashir

et al. 2021

Journal of Alloys and Compounds

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“…Silver nanoparticles (AgNPs) possess strong surface plasmon resonance (SPR) in the visible region of an electromagnetic spectrum. 7 − 9 These advanced nanoparticles of silver have a variety of applications in the field of electronics, 10 imagining, 11 biosensing, 11 , 12 pharmaceuticals, 11 , 13 drug delivery, 11 catalyst, 14 − 16 and so on. AgNPs possess strong activity against all types of microorganisms 17 , 18 and show the highest antimicrobial activity among all noble-metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…Comparatively, silver salts are less expensive than gold salt, so preferentially, large-scale synthesis can easily be made possible with a silver salt. Silver nanoparticles (AgNPs) possess strong surface plasmon resonance (SPR) in the visible region of an electromagnetic spectrum. − These advanced nanoparticles of silver have a variety of applications in the field of electronics, imagining, biosensing, , pharmaceuticals, , drug delivery, catalyst, − and so on. AgNPs possess strong activity against all types of microorganisms , and show the highest antimicrobial activity among all noble-metal nanoparticles. , Researchers have used numerous routes to prepare these nanomaterials, viz., sol–gel method, , solvothermal method, , microemulsion, , reverse microemulsion, green synthesis, − electrochemical method, laser ablation, and chemical reduction with or without capping or stabilizing agent. − Depending upon the experimental conditions, method of preparation, adsorption or absorption process involved in stabilization and interaction of metal ions with a reducing agent, and concentration of each component present in the reaction, characteristics like size distribution in nanoscale range, morphology (spherical, rodlike, sheet, prismatic, triangular, etc.…”

Section: Introductionmentioning

confidence: 99%

Growth Kinetic Study of Tannic Acid Mediated Monodispersed Silver Nanoparticles Synthesized by Chemical Reduction Method and Its Characterization

et al. 2021

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The complex process of nanoparticle formation in an aqueous solution is governed by kinetics and thermodynamic factors. This paper describes a room-temperature growth kinetic study and evaluation of thermodynamic activation parameters of monodispersed silver nanoparticles (AgNPs) synthesized in alkaline medium by chemical reduction method using AgNO 3 as a source of Ag + ions and tannic acid (TA) as a reductant (reducing agent) as well as a capping or stabilizing agent in the absence of any other external stabilizer. A simple and conveniently handled reaction process was monitored spectrophotometrically to study the growth kinetics in an aqueous solution as a function of the concentration of silver ion, hydroxide ion, and TA, respectively. The neutral nucleophilic group donates the electron density via a lone pair of electrons to Ag + ions for the reduction process, i.e., for the nucleation of AgNPs colloid. Also, a few silver ions form a silver oxide, which also facilitates the nucleation center to enhance the growth of AgNPs colloid. The decrease and increase in rate constant on varying the TA concentration showed its adsorption onto the surface of metallic AgNPs and stabilized by polygalloyl units of TA and were the main elements to control the growth kinetics. Consequently, stabilized TA-mediated AgNPs are formed using the electron donated by quinone form of TA followed by a pseudo-first-order reaction. Apart from this, nanoparticles formed were characterized using UV–visible spectrophotometry, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and powder X-ray diffraction techniques to confirm its formation during the present kinetic study.

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“…The aggregation could be due to the interactions and Van der Waals forces between the MgONPs [29]. Researchers also reported that larger grains could be attributed to the Oswald ripening process, with limited porosity and crystallinity [30]. The SEM analysis of the surface morphology of the MgONPs calcined at 400 • C (see Figure 5) shows that the nanoparticles are agglomerated and have a spherical shape with minor variations in size and shape.…”

Section: Spectroscopic Characterizationmentioning

confidence: 97%

Section: Spectroscopic Characterizationmentioning

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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Date pits extracts assisted synthesis of magnesium oxides nanoparticles and its application towards the photocatalytic degradation of methylene blue

Cited by 45 publications

References 24 publications

Bio-synthesised black α-Cr2O3 nanoparticles; experimental analysis and density function theory calculations

Bio-synthesised black α-Cr2O3 nanoparticles; experimental analysis and density function theory calculations

Growth Kinetic Study of Tannic Acid Mediated Monodispersed Silver Nanoparticles Synthesized by Chemical Reduction Method and Its Characterization

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

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