scholarly journals Magneto-sensitive Carbon-inorganic Composites Based on Particleboard and Plywood Wastes

2021 ◽  
Author(s):  
Mariia Galaburda ◽  
Viktor Bogatyrov ◽  
Dariusz Sternik ◽  
Olena Oranska ◽  
Mykola Borysenko ◽  
...  
Keyword(s):  
Morphological Characteristics ◽  
Nitrogen Adsorption ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
External Magnet ◽  
X Ray ◽  
Inorganic Composites ◽  
Good Magnetic Property ◽  
Porous Composites ◽  
Scanning Electron

The conversion of metal-modified (Fe, Co) sawdust into magneto-sensitive porous composites using thermal carbonization process in an inert atmosphere was successfully achieved. The as-prepared samples were characterized using nitrogen adsorption, X-ray diffraction, scanning electron microscopy and thermal analysis methods. The obtained results show that the structural and morphological characteristics of the obtained composites depend strongly on the metal precursor’s types. All samples exhibited a good magnetic property and can be easily separated from liquids by an external magnet.

scholarly journals Obtention and Characterization of Ferrous Chloride FeCl2·4H2O from Water Pickling Liquors

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4840
Author(s):  
Lorena Alcaraz ◽  
Belén Sotillo ◽  
José F. Marco ◽  
Francisco J. Alguacil ◽  
Paloma Fernández ◽  
...  
Keyword(s):  
Waste Water ◽  
Structural Characteristics ◽  
Morphological Characteristics ◽  
Aged Sample ◽  
X Ray Diffraction ◽  
Ferrous Chloride ◽  
Photoluminescence Study ◽  
X Ray ◽  
Scanning Electron

As a hazardous waste, water pickling liquors must be properly treated. An alternative consists of promoting the formation of ferrous salts from this residue due to their higher ferrous content. Since FeCl2·4H2O is widely used in several applications, obtaining pure crystals of this material appears to be an interesting prospect. However, this compound has scarcely been investigated. In the present work, FeCl2·4H2O crystals were obtained from water pickling liquors. Their structural and morphological characteristics were investigated by X-ray diffraction, scanning electron microscopy as well as Mössbauer spectroscopy. In addition, the photoluminescence study of the obtained samples was also assessed. It was observed that after some aging time, the obtained crystals changed in colour from green to more yellowish. As such, the aged sample was also evaluated, and their structural characteristics were compared with the original crystals. Despite this, the obtained crystals exhibit a FeCl2·4H2O structure, which is not modified with the aging of the sample.

Effect of Microwave Power in Obtaining Ferrite Nanopowders Synthesized by Combustion

2014 ◽  
Vol 775-776 ◽  
pp. 450-454
Author(s):  
Mirele Costa da Silva ◽  
A.T.C. Silva ◽  
Ana Cristina F. Melo Costa ◽  
Normanda Lino de Freitas
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Crystallite Size ◽  
Microwave Power ◽  
Morphological Characteristics ◽  
Ferrite Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Scanning Electron

The search of variations in the methodology for obtaining nanoferrites has attracted the interest of researchers in search of better results with regard to the structure and morphology of these materials. This study evaluates the effect of microwave power (50 and 70 W) in the structural and morphological characteristics of NiZn ferrite, using aniline as a fuel for combustion reaction. The aluminas were characterized by X-ray diffraction and scanning electron microscopy. The results showed that only the variation in microwave power is sufficient to change the structure of nanoferrites. The sample synthesized in power of 50 W was presented monophasic, illustrating the ferrite phase with crystallite size of 50.04 nm; and for 70 W, it was appeared, besides the ferrite phase, hematite and zinc oxide with a crystallite size of 17.07 nm. The morphology did not change significantly, the nanoferrites showed particles with similar geometry.

Microstructure of Nanocrystalline Ceramics

1988 ◽  
Vol 132 ◽  
Author(s):  
H. Hahn ◽  
J. Logas ◽  
H. J. Höfler ◽  
Th. Bier ◽  
R. S. Averback
Keyword(s):  
Grain Growth ◽  
Sintering Temperature ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Green Body ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
X Ray ◽  
Nanocrystalline Ceramics ◽  
Scanning Electron

ABSTRACTThe microstructure of nanocrystalline (n-) TiO2 was studied as a function of sintering temperature up to 1273 K. Grain growth was monitored using x-ray diffraction and scanning electron microscopy. Measurements of density and permeability of He and Ar were also conducted. The specific surface area and the total pore volume were determined quantitatively using the nitrogen adsorption method. These measurements revealed that highly compacted n-TiO2 had green body densities as high as 75 % of bulk density and that sintering occurred at much lower temperatures than in conventional powder. Densification proceeded by loss of the small pores first. The possibilities of achieving high densities with limited grain growth will be discussed.

scholarly journals Recovery Of Electrodic Powder From Spent Lithium Ion Batteries (LIBs)

2015 ◽  
Vol 60 (2) ◽  
pp. 1145-1149 ◽  
Author(s):  
S.M. Shin ◽  
G.J. Jung ◽  
Woo-Jin Lee ◽  
C.Y. Kang ◽  
J.P. Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Recycling Process ◽  
X Ray ◽  
New Process ◽  
Scanning Electron

Abstract This study was focused on recycling process newly proposed to recover electrodic powder enriched in cobalt (Co) and lithium (Li) from spent lithium ion battery. In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent lithium ion batteries (LIBs) were heated over the range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and atomic absorption spectroscopy (AA) and furthermore image of the powder was taken by scanning electron microscopy (SEM). It was finally found that cobalt and lithium were mainly recovered to about 49 wt.% and 4 wt.% in electrodic powder, respectively.

scholarly journals The ultrasound effect on the morphological properties of hydroxyapatite

2018 ◽  
Vol 243 ◽  
pp. 00012 ◽  
Author(s):  
Konstantin Chuprunov ◽  
Eugenii Kolesnikov ◽  
Igor Ilinykh ◽  
Andrey Yudin ◽  
Denis Leybo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Ultrasonic Treatment ◽  
Nitrogen Adsorption ◽  
Morphological Properties ◽  
Pressure Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ultrasound Assisted ◽  
Ultrasound Effect ◽  
Scanning Electron

The present study considers the morphological and dispersity characteristics of hydroxyapatite (HAp) samples synthesised through the ultrasound-assisted hydrothermal method with additional pressure treatment. The samples were analyzed by the X – Ray diffraction, scanning electron microscopy, low-temperature nitrogen adsorption. The ultrasound effect on the HAp morphologiy and dispersity was studied. The pressure assisted ultrasonic treatment made possible obtaining HAp samples with different morphology from rods and flakes to particles with irregular shape close to spherical. Also pressure assisted ultrasonic treatment able to increase the porosity of HAp materials.

Bimetallic Ni-Mo Nitride as the Carbon Dioxide Hydrogenation Catalyst

2013 ◽  
Vol 872 ◽  
pp. 3-9 ◽  
Author(s):  
Denis V. Leybo ◽  
Natalia I. Kosova ◽  
Konstantin O. Chuprunov ◽  
Denis V. Kuznetsov ◽  
Irina A. Kurzina
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Scanning Electron Microscopy ◽  
Contact Time ◽  
Nitrogen Adsorption ◽  
Hydrogenation Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Dioxide Hydrogenation ◽  
Scanning Electron

The possibility of bimetallic Ni-Mo nitrides usage as the catalysts in carbon dioxide hydrogenation reaction was examined in this work. Powders were synthesized through thermo-programmed reduction of precursor, which was produced by evaporation of the metal-containing solution. Specimens were investigated by x-ray diffraction, thermogravimetry, low-temperature nitrogen adsorption and scanning electron microscopy. It is shown that final powders provide CO2 conversion of 29 % for contact time of 0.26 s.

scholarly journals Some Environmentally Relevant Reactions of Cerium Oxide

2014 ◽  
Vol 13 (2) ◽  
pp. 148-161 ◽  
Author(s):  
Pavel Janoš ◽  
Jakub Ederer ◽  
Marek Došek
Keyword(s):  
Cerium Oxide ◽  
Flame Retardants ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cerium Oxides ◽  
Surface Areas ◽  
Bet Method ◽  
Phosphorus Containing ◽  
Scanning Electron

Abstract Reactive forms of cerium oxide were prepared by a thermal decomposition of various precursors, namely carbonates, oxalates and citrates, commercially available nanocrystalline cerium oxide (nanoceria) was involved in the study for comparison. Scanning electron microscopy (SEM) and x-ray diffraction analysis (XRD) were used to examine the morphology and crystallinity of the samples, respectively, whereas the Brunauer-Emmett-Teller (BET) method of nitrogen adsorption was used to determine surface areas. Interactions of cerium oxide with some phosphorus-containing compounds were investigated. Some of the examined samples, especially those prepared by annealing from carbonate precursors, exhibited an outstanding ability to destroy highly toxic organophosphates, such as pesticides (parathion methyl), or nerve agents (soman, VX). There were identified some relations between the degradation efficiency of cerium oxides and their crystallinity. It was also shown that cerium oxide is able to destroy one of widely used flame retardants - triphenyl phosphate. A phosphatase-mimetic activity of various cerium oxides was examined with the aid of a standardized phosphatase test.

scholarly journals Obtention and Characterization of Ferrous Chloride FeCl2·4H2O from Pickling Waste Liquors

2021 ◽  
Author(s):  
Lorena Alcaraz ◽  
Belén Sotillo ◽  
José F. Marco ◽  
Francisco J. Alguacil ◽  
Paloma Fernández ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Structural Characteristics ◽  
Morphological Characteristics ◽  
Aged Sample ◽  
X Ray Diffraction ◽  
Ferrous Chloride ◽  
Photoluminescence Study ◽  
X Ray ◽  
Scanning Electron

As a hazardous waste, pickling waste liquor must be properly treated. An alternative consists in promoting the formation of ferrous salts from this residue, due to its higher ferrous content. Since FeCl2·4H2O is widely used in several applications, obtaining pure crystals of this material appears to be an interesting prospect. However, this compound has scarcely been investigated. In the present work, FeCl2·4H2O crystals have been obtained from pickling waste liquors. Their structural and morphological characteristics have been investigated by X-ray diffraction, scanning electron microscopy as well as Mössbauer spectroscopy. In addition, the photoluminescence study of the obtained samples was also assessed. It was observed that after some aging time, the obtained crystals change in colour from green to more yellowish. So, the aged sample has also been evaluated, and their structural characteristics are compared with the original crystals. Despite this, the obtained crystals exhibit a FeCl2·4H2O structure, which is not modified with the aging of the sample.

scholarly journals Mesoporous Ni–Fe Alloys

2008 ◽  
Vol 26 (8) ◽  
pp. 581-588
Author(s):  
Yu Okuno ◽  
Yoshiyuki Hattori ◽  
Tomonori Ohba ◽  
Katsumi Kaneko ◽  
Hirofumi Kanoh
Keyword(s):  
Crystal Structure ◽  
Photoelectron Spectroscopy ◽  
Nitrogen Adsorption ◽  
Inert Atmosphere ◽  
Poly Vinyl Alcohol ◽  
Polymer Precursor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fe Alloys ◽  
Original Crystal

A nano-structured alloy of Ni and Fe was prepared using poly(vinyl alcohol) (PVA) as a polymer precursor, followed by the reduction of Ni2+ and Fe3+ ions to the corresponding metals by heat treatment of the PVA film containing the metal ions under an inert atmosphere. The alloy obtained was characterized by nitrogen adsorption studies, X-ray diffraction and electron microscopy measurements, and by X-ray photoelectron spectroscopy. The nano-structured alloy had the same crystal structure as that of metallic Ni although metallic Fe formed a different structure. The introduction of Fe atoms caused disorder and less crystallinity in the crystal structure of the alloy, whereas Ni atoms tended to maintain the original crystal structure. Nitrogen adsorption measurements at 77 K showed that the nano-structured Ni–Fe alloy contained mesopores of 4–10 nm in diameter.

Hydrogenation of Citral Over Ni on Monolith

2005 ◽  
Vol 3 (1) ◽  
Author(s):  
Jeannette Aumo ◽  
Jyri-Pekka Mikkola ◽  
Jose Bernechea ◽  
Tapio Salmi ◽  
Dmitry Murzin
Keyword(s):  
Electron Microscopy ◽  
Reaction Rate ◽  
Batch Reactor ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Reactor Configuration ◽  
X Ray ◽  
Monolith Reactor ◽  
Different Temperatures ◽  
Scanning Electron

Citral was hydrogenated over Ni on alumina wash-coated cordierite monoliths in a screw impeller batch reactor. The prepared catalyst was characterized by means of nitrogen adsorption (BET), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The performance of the monolith reactor configuration at different temperatures and pressures was compared. Reasonable reaction rate was obtained even after 18 consecutive experiments without regeneration of the catalyst. At temperatures up to 80°C and 5 bar pressure the selectivity to citronellal was ca. 93 %. Increasing the temperature to 100°C decreased the selectivity of citronellal to 65 %. At 100°C and 40 bar pressure the selectivity of citronellal was diminished to 1.4 % due to the formation of the fully hydrogenated product 3,7-dimethyloctanol with a selectivity of 93 %.

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