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Tytuł:
Recycling of Cerium and Lanthanum from Glass Polishing Sludge
Autorzy:
Lee, Chi-En Hung
Lo, Yu-Chien
Sandagdorj, Nyamdorj
Gankhuyag, Enkhsaikhan
Popuri, Srinivasa Rao
Hung, Chi-En
Powiązania:
https://bibliotekanauki.pl/articles/779586.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Cerium
Lanthanum
Waste
Sludge
Leaching
Recycling
Opis:
To examine the efficiency of La and Ce recycling processes from the sludge, two major methods were used, namely leaching and precipitation. The findings suggest that 12% of La and 24.2% of Ce were contained in the sludge. The sludge was leached in an optimum condition of 6N HCl at a temperature of 70°C with a 3g/50 mL solid/liquid ratio for 3 h to obtain a 100% leaching recovery of La and Ce. After pH adjustment of the obtained La and Ce optimum leaching solution to 6 with NH4OH and a simultaneous addition of H2O2 in a ratio of 1:1, Ce precipitated out with 65.9% recovery. On the other hand, La was not precipitated. The results obtained in this study reveal that leaching and pH adjustment method could be used to recover the valuable REE of La and Ce from glass polishing sludge in order to reach the goals of resource recycling.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 26-30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-lanthanum catalyst precursors for ammonia synthesis: determination of calcination temperature and storage conditions
Autorzy:
Zybert, M.
Tarka, A.
Mierzwa, B.
Raróg-Pilecka, W.
Powiązania:
https://bibliotekanauki.pl/articles/778044.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ammonia synthesis
catalyst precursor
cobalt
lanthanum
thermal analysis
Opis:
A thermal decomposition of a cobalt-lanthanum catalyst precursor containing a mixture of cobalt and lanthanum compounds obtained by co-precipitation were studied using thermal analysis coupled with mass spectrometry (TG-MS). Studies revealed that the calcination in air at 500°C is sufficient to transform the obtained cobalt precipitate into Co3 O4 , but it leads to only partial decomposition of lanthanum precipitate. In order to obtain Co/La catalyst precursor containing La2 O3  the calcination in air at the temperature about 800°C is required. However, it is unfavorable from the point of view of textural properties of the catalyst precursor. A strong effect of storage conditions on the phase composition of the studied cobalt-lanthanum catalyst precursor, caused by the formation of lanthanum hydroxide and lanthanum carbonates from La2 O3  when contacting with air, was observed.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 61-66
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties and activity of the cobalt catalysts for NH3 &enspsynthesis obtained by co-precipitation – the effect of lanthanum addition
Autorzy:
Zybert, M.
Karasińska, M.
Truszkiewicz, E.
Mierzwa, B.
Raróg-Pilecka, W.
Powiązania:
https://bibliotekanauki.pl/articles/778653.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ammonia synthesis
cobalt catalyst
promoter
lanthanum
coprecipitation
Opis:
In modern research on catalysts for NH3&enspsynthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH3&enspsynthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH3&enspsynthesis.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 1; 138-143
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydroxyapatite Lanthanum Oxide Composites
Autorzy:
Bozkurt, Y.
Pazarlioglu, S.
Gokce, H.
Gurler, I.
Salman, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401437.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.jf
Opis:
In the present study a commercially synthetic hydroxyapatite powders (CSHAp) were doped with lanthanum oxide (5 and 10 wt.% La₂O₃). The composite powders were well homogenized and pelleted in an uniaxial mould at 350 MPa. Pelleted green bodies were sintered at five different temperatures. Finally, the effect of La₂O₃ amount on the microstructural and mechanical properties of CSHA was investigated. Microstructural properties were detected by X-ray diffraction patterns (XRD) and scanning electron microscope (SEM). Mechanical properties of the sintered samples were determined by the density, hardness and compression strength measurements. Experimental results show that the mechanical properties of HA can be improved by the doping of La₂O₃
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1407-1409
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lantan i cer w glebach Polski
Autorzy:
Kwecko, P.
Powiązania:
https://bibliotekanauki.pl/articles/2074972.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
lanthanum
cerium
REE
soils
Polska
lantan
cer
gleby
Polska
Opis:
The paper present basic spatial analysis lanthanum and cerium distribution in Poland soils. Attempted to determine geochemical background and range and intensity of enrichment and anomalies La and Ce content in top (0–0,2 m) and bottom (0,5–2 m) soils. These data are presented in the form two color maps of polygonal with basic statistic information. The text part describes the main areas of enrichment and attempts to indicate the source of these values.
Źródło:
Przegląd Geologiczny; 2012, 60, 9; 490--495
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Sensitivity of Autotrophic and Heterotrophic Microorganisms to the Pollution of Natural Water with Rare Earth Elements (Lanthanum and Cerium)
Autorzy:
Lozhkina, Roza A.
Olkova, Anna S.
Koval, Ekaterina V.
Tomilina, Irina I.
Sysolyatina, Maria A.
Powiązania:
https://bibliotekanauki.pl/articles/2086379.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
rare earth elements
lanthanum
cerium
bioassay
Nostoc linckia
Chlorella vulgaris
Paramecium caudatum
Escherichia coli
Opis:
The purpose of the work was to compare the sensitivity of autotrophic and heterotrophic organisms used in bioassay to lanthanum and cerium under the conditions of a model experiment with aqueous media. Using bioassay methods, the pre-lethal effects of La and Ce in heterotrophic Paramecium caudatum and Escherichia coli, as well as autotrophic Chlorella vulgaris and Nostoc linckia were determined. Model solutions of La2 (SO4)3∙8H2O and Ce2 (SO4)3∙8H2O were tested in the concentration range of 0.1–200 mg/l. As a result, it was shown that heterotrophic organisms are more sensitive to water pollution with La and Ce than autotrophic ones. According to the totality of experiments, cerium turned out to be more toxic than lanthanum. When planning the environmental studies of wastewater or reservoirs polluted with REE, it is recommended to focus on comparative sensitivity of bioassay methods, taking into account the test-functions used: bioassay for chemotaxis of P. caudatum > bioassay for changes in bioluminescence of E. coli (strain M-17) > bioassay for the content of chlorophyll а and intensity of lipid peroxidation in N. linckia > bioassay on the increase in the number of Cl. vulgaris.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 58--63
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioisotope tracer study in an indirectly heated rotary dryer
Autorzy:
Pant, H.
Powiązania:
https://bibliotekanauki.pl/articles/147094.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
holdup
lanthanum-140
mean residence time
radioisotope tracer
residence time distribution
rotary dryer
variance
Opis:
A radioisotope tracer study was carried-out in a pilot scale indirectly heated rotary dryer to measure residence time distribution (RTD) of sand particles. Lanthanum-140 labeled sand was used as a tracer. Mean residence time (MRT) and variance of the tracer distribution curves were calculated from the measured RTD curves. From the calculated MRTs, solid holdup in the dryer was estimated. The qualitative comparison of the dimensionless variance with the data published in the literature led to the conclusion that the rotary dryer behaves as a plug flow system. The results of the study were used to design a full-scale industrial rotary dryer.
Źródło:
Nukleonika; 2002, 47, 4; 173-176
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materiały dla jednowarstwowych ogniw paliwowych
Materials for single layer fuel cells
Autorzy:
Winiarz, P.
Powiązania:
https://bibliotekanauki.pl/articles/134696.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
fuel cell
composite material
proton conductor
lanthanum niobate
scanning electron microscopy
x-ray diffraction
Opis:
A composite material, which may be further applied as a single layer fuel cell, was synthesized using solid state synthesis method. Composite consisted of two components. The first was a nanoceramic proton conductor – calcium doped lanthanum niobate. The second one was a nanoceramic semiconductor oxide composed of lithium, nickel and zinc oxides respectively. Structural and electrical investigations were performed on the received material. Scanning electron microscope images showed that the microstructure on the surface of this material is homogeneous. Energy dispersive X-Ray diffraction confirms that the components of the investigated composite are mixed together in a volume of material allowing to current flow through the percolation threshold. Open circuit voltage was changing during measurement from 0.8V to 0.6V. Moreover, the material did not change its structural properties during the current flow, hence it could be a good candidate to the production of single layer fuel cells.
Źródło:
Technical Issues; 2016, 4; 104-109
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a new scintillation crystal (LaBr3) in PET scanners using Monte Carlo method
Autorzy:
Karimian, A. E.
Thompson, Ch. J.
Powiązania:
https://bibliotekanauki.pl/articles/146815.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
PET
scintillation crystals
Monte Carlo
lanthanum bromide
Opis:
The main aim of this work is to investigate the use of new lanthanum bromide (LaBr3) in whole body PET (WB-PET) scanners and to compare the obtained results with those for BGO and LSO crystals which are currently used in conventional and dedicated PET systems. Our results show that there is a gain in noise effective count rate (NECR) arising from the reduced scatter and random fractions in a LaBr3 scanner. The spatial resolution of the WB-PET with LaBr3 is slightly worse than the LSO and BGO crystals because of its low density and effective atomic number. But our study showed the increased NECR, excellent energy resolution and low decay time of LaBr3 which promise a significant improvement in WB-PET performances especially for narrow coincidence windows.
Źródło:
Nukleonika; 2008, 53, 1; 5-6
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PZT-Type Ceramics Doped with Manganese, Antimony, Lanthanum and Tungsten - Technology and Physical Properties
Autorzy:
Bochenek, D.
Niemiec, P.
Ćwikiel, E.
Goryczka, T.
Powiązania:
https://bibliotekanauki.pl/articles/353398.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PZT type ceramics
perovskite type materials
ferroelectrics
doped
Opis:
The work three ceramic compositions based on PbZr0.49 Ti0.51O3 doped with manganese (Mn), antimony (Sb), lanthanum (La) and tungsten (W) were obtained. The introduction of a set of admixtures was aimed at improving the sinterability of ceramic materials and optimizing its electrophysical parameters. Multi-component materials of the PZT-type with a general formula: Pb(PbZr0.49 Ti0.51)0.94 Mn0.021 Sb0.016 LayWz O3 (where y from 0.008 to 0.012 and z from 0.012 to 0.014) were prepared by the conventional mixed oxide method. After mixing and drying the powder mixtures were calcined in air at 850°C for 4 h, while densification of the powders was carried out by the free sintering method at 1150°C for 2 h. The final steps of technology were grinding, polishing, annealing and putting silver paste electrodes onto both surfaces of the samples for electrical testing. XRD, SEM, EDS, dielectric, ferroelectric, piezoelectric properties and DC electrical conductivity of the obtained ceramic compositions were carried out. X-ray tests of the crystal structure conducted at room temperature have shown that all obtained the PZT-type materials were a single phase (perovskite type) without the presence of a foreign phase. Symmetry of the crystal lattice was identified as space group P4mm. Temperature dielectric studies have shown high values of dielectric permittivity and low dielectric loss. The presented physical properties of ceramic samples based on PZT confirm their predisposition for application in modern microelectronic and micromechatronic applications.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 827-837
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of lanthanum(III) and yttrium(III) on kaolinite: kinetics and adsorption isotherms
Autorzy:
Zhou, Fang
Feng, Jian
Xie, Xiong
Wu, Baihong
Liu, Qi
Wu, Xiaoyan
Chi, Ruan
Powiązania:
https://bibliotekanauki.pl/articles/109951.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
kaolinite
rare earth
kinetics
Opis:
Experimental investigations were carried out using kaolinite to adsorb two rare earth ions, lanthanum ion (La3+) and yttrium ion (Y3+), which will provide some useful information and new insights on the mineralization process and fractionation phenomenon of weathered crust elution-deposited rare earth ores. The results showed that the equilibrium adsorption capacity of Y3+ is greater than La3+ under the same experimental conditions. The adsorption of rare earth ions presents strongly temperature dependent indicating an endothermic adsorption process. The pseudo-first-order kinetic model and the pseudo-second-order kinetic model were applied to discuss the adsorption kinetics. It was found that the adsorption rate of rare earth follows the pseudo-second-order kinetic model among the adsorption temperature range. Furthermore, the adsorption process of rare earth ions on kaolinite followed the Langmuir isotherm model confirmed by the correlation of experimental equilibrium data to standard isotherm model, Langmuir and Freundlich isotherms. The activation energies for the adsorption of La3+ and Y3+ on kaolinite are 28.1903 kJ/mol and 25.4190 kJ/mol, respectively. All kaolinite before and after adsorption were characterized by XRD and SEM-EDX to understand the adsorption mechanism. The obtained results suggested that the adsorption of La3+ and Y3+ on kaolinite is an endothermic and chemisorption process.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 4; 928-939
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potencjometryczny sensor chloru
Potentiometric chlorine sensor
Autorzy:
Dziubaniuk, M.
Janora, S.
Pasierb, P.
Rękas, M.
Powiązania:
https://bibliotekanauki.pl/articles/155648.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sensory potencjometryczne
ogniwa stałe
sensor chloru
tlenochlorek lantanu
potentiometric gas sensors
solid cells
chlorine gas sensor
lanthanum oxy-chloride
Opis:
Do konstrukcji sensora chloru wybrano tlenochlorek lantanu, LaOCl, jako elektrolit stały. Jego warunki preparatyki określono metodą analizy termicznej oraz dyfrakcji promieniowania rentgenowskiego. Mikrostrukturę spieku elektrolitu określono przy użyciu mikroskopii elektronowej. Charakterystykę sensora wyznaczono dla koncentracji chloru w powietrzu w zakresie 0-100 ppm. Skonstruowany sensor pracuje poprawnie i jest stabilny w zakresie temperatur 500 - 800°C. Wyznaczona zależność napięcia źródłowego ogniwa od koncentracji chloru jest zgodna z prawem Nernsta dla n=2.
A chlorine gas sensor was fabricated with the Cl- ion conducting lanthanum oxy-chloride, LaOCl, a solid electrolyte. Preparation conditions, especially the optimal calcination temperature, were determined by means of the differential thermal analysis (DTA), thermogravimetry (TG) as well as mass spectrometry (MS). According to the x-ray diffraction (XRD) analysis, the product was homogenous and crystallized in tetragonal P4/nmm structure. Scanning electron microscopy (SEM) revealed that it is composed of uniform grains of the 210-260 nm dimension. The sensor manu-facture consisted of several steps. Firstly, the powder of LaOCl was pressed in pellet die (100 MPa) and calcined at 700°C for 2 hours. Then, both sides of polished pellet were covered with Pt paste. It was fired at 1100°C for 2 hours after cooling down the pellet was attached to Al2O3 tube using the ceramic binder to allow the separation of both electrode compartments during the sensor operation. The device was dried and heated at 370°C. The electromotive force (EMF) of the constructed cell was measured asa function of temperature (400- 800°C), Cl2 concentration in air (0-100 ppm) at sensing electrode and time. Air with constant concen-tration of chlorine (100 ppm) gas atmosphere was kept at reference electrode. The sensor exhibited reliable, stable and reproducible signal at operation temperature between 500 - 800°C. The deter-mined EMF vs. logp(Cl2) dependence may be described by the Nernst law for n= 2.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 6, 6; 525-528
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nickel/Zinc ratio and lanthanum substitution effect on structural and magnetic properties of nickel zinc ferrites
Autorzy:
Jančárik, V.
Šoka, M.
Ušáková, M.
Harťanský, R.
Powiązania:
https://bibliotekanauki.pl/articles/1053078.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Gg
75.30.Cr
61.05.C-
Opis:
Improvement of NiZn ferrites properties by means on Ni/Zn content ratio modification and by partial substitution of Fe³⁺ ions by La³⁺ ions is presented. Ni_{x}Zn_{1-x}Fe₂O₄ and Ni_{x}Zn_{1-x}La_{0.02}Fe_{1.98}O₄ samples of small particles were prepared by self-propagated combustion method. X-ray spectroscopy was used for structural analysis, temperature dependence of magnetic susceptibility was used for evaluation of chemical and phase composition. Analysis showed that pure spinel structure without secondary phase caused by La ions for all values of Ni/Zn content was present. Noticeable growth of the magnetic susceptibility at room temperature was observed with rising of Zn²⁺ ions content.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 693-695
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Spectral Characterization and Biological Studies of Lanthanum(III) Complexes with 3-Substituted-4-Amino-5-Mercapo-1,4-Triazoles Schiff Bases
Autorzy:
Yadawe, M. S.
Unki, S. N.
Patil, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/411978.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Schiff
antibacterial
antifungal
Opis:
Some lanthanum(III) complexes have been synthesized by reacting lanthanum(III) metal salt with Schiff bases derived from 3-substituted-4-amino-5-mercapto-1,2,4-triazole and glyoxal/ biacetyl/ benzyl. All these complexes are not soluble in common organic solvents. However sparingly soluble in DMF and DMSO. The chemical analysis of the complexes confirmed to the stoichiometry of the type La(III)LNO3•H2O. La(III)LCl•H2O and La(III)LNCS•H2O respectively. The chelation of the complexes has been proposed in the light of analytical, spectral studies. The measured molar conductance values indicate that, the complexes are non-electrolytes. The Schiff bases and their complexes have been screened for their antibacterial and antifungal activities. The results of these studies show the metal complexes to be more antibacterial and antifungal as compared to the uncomplexed coumarins. lanthanum(III) complexes.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 12; 94-104
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of lanthanum(III) and europium(III) – lactate interaction constants by capillary electrophoresis for environmental applications
Autorzy:
Bortolus, S.
Varenne, A.
Draye, M.
Gareil, P.
Czerwiński, K.
Cote, G.
Powiązania:
https://bibliotekanauki.pl/articles/347001.pdf
Data publikacji:
2003
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
lanthanides(III)
lactate
separation
interaction constants
capillary electrophoresis
Opis:
In the present work, we investigated the ability of electrophoresis to determine the stability constant of the complex formed between lactate ions (a simple model of natural organic matter), and lanthanum (III) and europium (III), two model metal cations of actinides. The effect of lactate on lanthanide’s effective mobility is studied, and conditional metal ion-ligand interaction constants are determined on the basis of the variation in the effective mobilities (log βn = 2.23 for lanthanum (III) and 2.39 for europium (III), at 25°C and I=0.015 M). The originality of this contribution lies in the fact that we have chosen to detect the metal ion instead of the ligand by an indirect UV-visible detection and using a chromophoric compound (creatinine).
Źródło:
Ars Separatoria Acta; 2003, 2; 29-35
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
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