A Study of Physicochemical Properties of Stockpile and Ponded Coal Ash

Šulc, Rostislav; Šídlová, Martina; Formáček, Petr; Snop, Roman; Škvára, František; Polonská, Adéla

doi:10.3390/ma15103653

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The XRD analysis coupled with Rietveld refinement was employed to qualitatively and quantitatively determine the mineral phases present within the obtained samples ( Figure 1 ; Table 1 ). The diffractograms reveal the formation of magnetite in the Fd-3m cubic crystal system as the single mineral phase within samples Fe 3 O 4 , Zn 0.1 Fe 2.9 O 4 , and Ce 0.1 Fe 2.9 O 4 , (according to JCPDS 01-084-2782 [ 33 , 34 ]). By contrast, the increase in the substitution degree to 16.66% leads to the occurrence of secondary mineral phases, namely ZnO and Ce 2 O 3 in the hexagonal crystal system (according to JCPDS 00-005-0664 [ 35 ] and JCPDS 00-023-1048 [ 36 ], respectively).…”

Section: Resultsmentioning

confidence: 99%

Zinc/Cerium-Substituted Magnetite Nanoparticles for Biomedical Applications

Chircov

Mincă

Şerban

et al. 2023

IJMS

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Numerous studies have reported the possibility of enhancing the properties of materials by incorporating foreign elements within their crystal lattice. In this context, while magnetite has widely known properties that have been used for various biomedical applications, the introduction of other metals within its structure could prospectively enhance its effectiveness. Specifically, zinc and cerium have demonstrated their biomedical potential through significant antioxidant, anticancer, and antimicrobial features. Therefore, the aim of the present study was to develop a series of zinc and/or cerium-substituted magnetite nanoparticles that could further be used in the medical sector. The nanostructures were synthesized through the co-precipitation method and their morpho-structural characteristics were evaluated through X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), dynamic light scattering (DLS), zeta potential, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) analyses. Furthermore, the nanostructures were subjected to a ROS-Glo H2O2 assay for assessing their antioxidant potential, MTT assay for determining their anticancer effects, and antimicrobial testing against S. aureus, P. aeruginosa, and C. albicans strains. Results have proven promising for future biomedical applications, as the nanostructures inhibit oxidative stress in normal cells, with between two- and three-fold reduction and cell proliferation in tumor cells; a two-fold decrease in cell viability and microbial growth; an inhibition zone diameter of 4–6 mm and minimum inhibitory concentration (MIC) of 1–2 mg/mL.

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Section: Resultsmentioning

confidence: 99%

Zinc/Cerium-Substituted Magnetite Nanoparticles for Biomedical Applications

Chircov

Mincă

Şerban

et al. 2023

IJMS

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“…The XRD analysis was employed for assessing the mineralogical phases present within the samples, while the Rietveld refinement allowed for the determination of the unit cell parameters and the average crystallite size. As the diffractograms show ( Figure 1 ), magnetite in the Fd–3m cubic crystal system is the unique crystalline phase within all samples (according to JCPDS 01-084-2782 [ 17 , 18 ]). Therefore, it can be concluded that despite the high pressure and temperature conditions for the reaction, microwave-assisted hydrothermal synthesis does not lead to the formation of secondary phases.…”

Section: Resultsmentioning

confidence: 99%

Usnic Acid-Loaded Magnetite Nanoparticles—A Comparative Study between Synthesis Methods

Chircov,

Bîrcă,

Dănciulescu

et al. 2023

Molecules

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Since cancer is a continuously increasing concern for the general population, more efficient treatment alternatives ought to be developed. In this regard, a promising direction is represented by the use of magnetite nanoparticles (MNPs) to act both as a nanocarrier for the targeted release of antitumoral drugs and as hyperthermia agents. Thus, the present study focused on improving the control upon the outcome properties of MNPs by using two synthesis methods, namely the co-precipitation and microwave-assisted hydrothermal method, for the incorporation of usnic acid (UA), a natural lichen-derived metabolite with proven anticancer activity. The obtained UA-loaded MNPs were thoroughly characterized regarding their morpho-structural and physicochemical properties through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS) and zeta potential, scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM). Results demonstrated the formation of magnetite as the unique mineralogical phase through both types of synthesis, with increased uniformity regarding the drug loading efficiency, size, stability, and magnetic properties obtained through the microwave-assisted hydrothermal method. Furthermore, the cytotoxicity of the nanostructures against the HEK 293T cell line was investigated through the XTT assay, which further proved their potential for anticancer treatment applications.

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“…Šulc et al [8] contributed an article entitled "A Study of Physicochemical Properties of Stockpile and Ponded Coal Ash". The article describes chemical and also selected physical properties of ponded high-temperature fly ash (FA) and bottom ash (BA) from a Mělník lignite power plant located in the Czech Republic.…”

Section: Contributionsmentioning

confidence: 99%