New optimized method for low-temperature hydrothermal production of porous ceramics using diatomaceous earth

Reka, Arianit A.; Pavlovski, Blagoj; Makreski, Petre

doi:10.1016/j.ceramint.2017.06.132

Cited by 37 publications

(17 citation statements)

References 19 publications

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“…The Republic of Macedonia is rich in inorganic materials with a wide range of potential use and application, including diatomaceous earth (REKA, et al, 2014;REKA et al, 2017), trepel (a biogenetic rock) (PAVLOVSKI et al, 2011;CEKOVA et al, 2013), pumicite (CEKOVA et al, 2013), dolomite (MAKRESKI et al, 2003;JOVANOVSKI et al, 2012), quartzite (JOVANOVSKI et al, 2012), bentonite (ŠONTEVSKA et al, 2007) and granite (JO-VANOVSKI et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Reka

Pavlovski²,

Lisichkov

et al. 2019

Geol Cro

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The physico-mechanical, chemical and mineralogical characteristics of volcanic glass (perlite) from the Mariovo region (Macedonia) as well as the mineralogical changes that occur during its thermal treatment were investigated to demonstrate its utilization for industrial use. The native perlite was characterized by chemical analysis, X-ray powder diffraction (XRPD), infrared (IR) spectroscopy, thermal analysis (TGA/DTA), scanning electron microscopy (SEM-EDX), transmission electron microscopy (TEM), and solid-state NMR. The chemical examination suggests that the perlite represents an acidic volcanic rock with a high percentage of SiO 2 (72.45%), high in alkali metal oxides (4.21 wt.% K 2 O, 3.56 wt.% Na 2 O), with a loss of ignition 3.54 wt.%. Results from the XRPD indicated major amorphous behaviour, with low amounts of feldspars, quartz, and cristobalite. SEM examinations revealed glassy structure with presence of certain pores (dimensions ranging from 50-100 μm). The determined expansion coefficient was 20 times its original volume. XRPD of expanded perlite compared to the native perlite depicted new intensive peaks of cristobalite. SEM and TEM revealed irregular morphology with broken or ragged edges. On the basis of the chemical and mineralogical composition, the studied perlite is classified as an appropriate material suitable as ceramic flux to lower the sintering temperature.

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Section: Introductionmentioning

confidence: 99%

Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Reka

Pavlovski²,

Lisichkov

et al. 2019

Geol Cro

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“…The endothermic peak at 90 °C in the DTA curve is mainly attributed to the dehydration of D 800 °C+HCl . A broad exothermic peak in the DTA curve was observed from 250–650 °C, which could result from the dehydroxylation of the silanol groups in D 800 °C+HCl [33] . The mass loss (∼3.89 wt%) in the 50–350 °C range is attributed to physically adsorbed water and dehydroxylation of D HCl+800 .…”

Section: Resultsmentioning

confidence: 96%

Effect of Chemical and Thermal Treatment Priority on Physicochemical Properties and Removal of Crystal Violet Dye from Aqueous Solution

Söğüt

2022

ChemistrySelect

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The release of pollutants, especially dyes, has been a significant concern as it affects the stability of ecosystems due to poor implementation of waste protocols. In this study, the diatomite samples were characterized by pHpzc, ICP, pore size distribution, XRD, TG‐DTA, BET, SEM and FTIR (before‐after). The adsorption properties of a cationically charged dye, crystal violet (CV), on the diatomite samples were investigated by varying the adsorption parameters with the aim of evaluating the adsorption mechanism. Nonlinear Langmuir, Freundlich, Dubinin‐Radushkevich and Redlich‐Peterson isotherm models, pseudo‐first and pseudo‐second order kinetic models, intraparticle diffusion and Boyd models were evaluated. The adsorption mechanism was explained by the Langmuir isotherm model and the maximum adsorption capacities for CV (at pH 7.0) of DHCl, D800 °C+HCl and DHCl+800 °C were 5.07 mg g−1 and 4.93 mg g−1 and 65.78. mg g−1 at 298 K, respectively. It was also shown that the CV adsorption was reasonable according to the second‐order kinetic model (R2=1). Adsorption occurred via two mechanisms: hydrophobic interactions and the combination of surface hydrogen bonding between the hydroxyl groups on the diatomite surface and the nitrogen atoms of the CV. The results indicated that using DHCl+800 °C would provide a simple, energy‐saving, and cost‐effective approach to removing cationic dyes from an aqueous solution.

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“…The XRPD analysis (Figure 1a) shows the presence of amorphous phase present in the sample, manifested with a wide bump in the region 15-30°2θ. This bump is due to the amorphous silica [18,19]. Evident is the presence of crystalline phases: quartz in the following 2θ Table 2 shows the results of the CA for the three tested samples (zirconium, alloy and composite).…”

Section: Xrpd Analysis Of the Starting Materialsmentioning

confidence: 99%

A study on the bacterial adhesion of Streptococcus mutans in various dental ceramics: In vitro study

et al. 2020

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Streptococcus mutans (S. mutans) has been identified as a major etiologic agent of human dental caries and forms a significant proportion of oral streptococci in carious lesions. This study investigates the correlation of surface properties (effect of contact angle [CA] and free surface energy) on three restorative materials (zirconia, nickel–chromium–molybdenum alloy and composites) used in dental prosthetics with bacterial adhesion to S. mutans. Ten samples of each material (zirconia, nickel–chromium–molybdenum alloy and composites) of 8 mm diameter and 2.5 mm thickness were used. Aqueous CA measurements, free surface energy and bacterial adhesion to the sample surfaces were performed. Bacterial adhesion is determined by planting samples in the blood agar cultures and using an electron microscope (scanning electron microscopy [SEM]). The highest values of bacterial adhesion are found in composites, followed by the metal alloy, while the lowest values are observed in zirconia. Measurements show that zirconia has 17 bacteria; Ni–Cr–Mo alloy has 65, while the composite has 80 bacteria. The composites showed the highest degree of bacterial adhesion, compared to the other investigated materials, which correlates with the free surface energy of the samples (24.31 mJ/m2 for zirconia, 31.78 mJ/m2 for Ni–Cr–Mo alloy and 48.82 mJ/m2 for the composite).

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New optimized method for low-temperature hydrothermal production of porous ceramics using diatomaceous earth

Cited by 37 publications

References 19 publications

Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Effect of Chemical and Thermal Treatment Priority on Physicochemical Properties and Removal of Crystal Violet Dye from Aqueous Solution

A study on the bacterial adhesion of Streptococcus mutans in various dental ceramics: In vitro study

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