A method to investigate the interaction of rare earth elements in aqueous solution with metal oxides

1991 ◽  
Vol 152 (2) ◽  
pp. 337-346 ◽  
Author(s):  
D. Koeppenkastrop ◽  
E. H. Decarlo ◽  
M. Roth
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Oxides

scholarly journals Extraction of Rare Earth Elements from Chloride Media with Tetrabutyl Diglycolamide in 1-Octanol Modified Carbon Dioxide

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 429 ◽  
Author(s):  
Mary Case ◽  
Robert Fox ◽  
Donna Baek ◽  
Chien Wai
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Modern World ◽  
Ndfeb Magnet ◽  
Phosphor Material ◽  
Aqueous Chloride ◽  
Hcl Concentration ◽  
Optimized Conditions

Rare earth elements (REEs) are critical to our modern world. Recycling REEs from used products could help with potential supply issues. Extracting REEs from chloride media with tetrabutyl diglycolamide (TBDGA) in carbon dioxide could help recycle REEs with less waste than traditional solvents. Carbon dioxide as a solvent is inexpensive, inert, and reusable. Conditions for extraction of Eu from aqueous chloride media were optimized by varying moles percent of 1-octanol modifier, temperature, pressure, Eu concentration, TBDGA concentration, Cl− concentration, and HCl concentration. These optimized conditions were tested on a Y, Ce, Eu, Tb simulant material, REEs containing NdFeB magnets, and lighting phosphor material. The optimized conditions were found to be 23 °C, 24.1 MPa, 0.5 mol% 1-octanol, with an excess of TBDGA. At these conditions 95 ± 2% Eu was extracted from 8 M (mol/m3) HCl. Extraction from the mixed REE simulate material resulted in separation of Y, Eu, and Tb from the Ce which remained in the aqueous solution. The extraction on NdFeB magnet dissolved into 8 M HCl resulted in extraction of Pr, Nd, Dy, and Fe >97%. This results in a separation from B, Al, and Ni. Extraction from a trichromatic lighting phosphor leachate resulted in extraction of Y and Eu >93% and no extraction of Ba, Mg, and Al.

scholarly journals Upconversion nanoparticles based on rare-earth elements

2019 ◽  
Vol 220 ◽  
pp. 03033
Author(s):  
Dmitrii Zharkov ◽  
Andrey Leontyev ◽  
Artemii Smelev ◽  
Victor Nikiforov ◽  
Vladimir Lobkov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Rare Earth ◽  
Laser Radiation ◽  
Rare Earth Elements ◽  
Hydrothermal Method ◽  
Water Soluble ◽  
Upconversion Nanoparticles ◽  
Biological Applications ◽  
Intense Luminescence

Using the hydrothermal method, we synthesized water soluble YVO4: Yb, Er nanoparticles with a size less than 10 nm. Nanoparticles exhibit intense luminescence in the green region due to Er3+ ions when excited by laser radiation at a wavelength of 980 nm as a result of the up-conversion process. Bright and stable luminescence also persists in an aqueous solution of nanoparticles. Based on experimental data, it can be argued that the objects obtained are promising in biological applications, as well as up-conversion phosphors.

scholarly journals Amine Sorbents for Selective Recovery of Heavy Rare‐Earth Elements (Dysprosium, Ytterbium) from Aqueous Solution

ChemPlusChem ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Qiuming Wang ◽  
Brian W. Kail ◽  
Walter C. Wilfong ◽  
Fan Shi ◽  
Thomas J. Tarka ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Heavy Rare Earth ◽  
Selective Recovery ◽  
Heavy Rare Earth Elements ◽  
Amine Sorbents

Uptake of rare earth elements from solution by metal oxides

1993 ◽  
Vol 27 (9) ◽  
pp. 1796-1802 ◽  
Author(s):  
Dirk Koeppenkastrop ◽  
Eric H. De Carlo
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Oxides

Structures and Optical Properties of Nanoforest-Like Carbon Nanotubes Decorated with Nanoparticles of Strontium Aluminate Doped with Rare-Earth Elements

MRS Advances ◽  
2018 ◽  
Vol 3 (1-2) ◽  
pp. 121-126
Author(s):  
Patsy Y. Arquieta Guillén ◽  
Alena Borisovna Kharissova ◽  
Beatriz Ortega García ◽  
Oxana V. Kharissova
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Oxides ◽  
Spray Pyrolysis ◽  
Metal Oxide Nanoparticles ◽  
Strontium Aluminate ◽  
Fluorescent Properties ◽  
Multi Wall Carbon Nanotubes

ABSTRACTNowadays, carbon nanotubes have a lot of applications in daily life, being applied in the fabrication of cellphones, computers, nanotransistors, among many others. Currently, their new applications in biotechnology area are in research, in particular in order to find new biosensors with fluorescent properties applying on the basis of multi-wall carbon nanotubes (MWCNTs). In this work, the obtaining of carbon nanoparticles having fluorescent properties via spray pyrolysis is presented. Synthesis, properties, structural peculiarities, and applications of nanobuds and related nanostructures are discussed. MWCNTs, decorated with strontium aluminate SrAl12O19 and doped with rare-earth elements, were synthetized from distinct organic precursors and the corresponding metal oxides. The metal oxides used were Samarium (Sm), Europium (Eu), Neodymium (Nd), Lanthanum (La), Cerium (Ce) and some their combinations.The synthesis was carried out on the surface of optical fibres to obtain a uniform growth of forest-like MWCNTs, adding to metal oxide nanoparticles to their surface. The preparation of composites was carried out by spray pyrolysis techniques in dry nitrogen atmosphere in the temperature range from 780 to 850°C. The formed products were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIR spectroscopy, Raman spectroscopy and UV/visible spectroscopies. The analysis of the obtained data shows that the deposited nanoparticles are in the range of size 20-60 nm being uniformly distributed on the surface of MWCNTs. The samples, obtained at different temperatures and with doping metal oxides added to SrAl12O19, show different fluorescence behavior. The best results were observed with lanthanum oxide as a dopant. Possible applications as persistently luminescent phosphors for the formed MWCNTs-supported luminescent materials are proposed.

Synthesis of novel GA-g-PAM/SiO2 nanocomposite for the recovery of rare earth elements (REE) ions from aqueous solution

2018 ◽  
Vol 170 ◽  
pp. 251-259 ◽  
Author(s):  
Sidra Iftekhar ◽  
Varsha Srivastava ◽  
Alba Casas ◽  
Mika Sillanpää
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Rare Earth Elements
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