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.

Study of the Radiation Resistance of Endohedral Fullerenes of Rare-Earth Elements and Their Water-Soluble Derivatives

2018 ◽  
Vol 63 (1) ◽  
pp. 132-138
Author(s):  
I. M. Dubovskii ◽  
V. T. Lebedev ◽  
V. A. Shilin ◽  
A. A. Szhogina ◽  
M. V. Suyasova ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Radiation Resistance ◽  
Water Soluble ◽  
Endohedral Fullerenes

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 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

Rare Earth Ion from Aqueous Solution Removed by Polymer Enhanced Ultrafiltration Process

2011 ◽  
Vol 233-235 ◽  
pp. 959-964 ◽  
Author(s):  
Gui E Chen ◽  
De Sun ◽  
Zhen Liang Xu
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Low Ph ◽  
Water Soluble ◽  
Rare Earth Ion ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Ion Rejection ◽  
Ultrafiltration Process ◽  
Added Salt

An efficiency of rare earth (europium, Eu) removal from aqueous solutions by polymer enhanced ultrafiltration (PEUF) process was investigated using two water-soluble polymers polyacrylic acid (PAA) and polyethylenimine (PEI). The effects of loading ratios of Eu to PAA or PEI, pH of solution and the added salt on Eu removal were evaluated. It was shown that the binding capacities for PAA and PEI to Eu ions were 0.8g Eu/g PAA and 0.5g Eu/g PEI, respectively. Eu ion rejection R decreased significantly at a low pH compared to the results at high pH, regardless of using PAA or PEI. Compared to the PAA case, PEI enhanced UF was more sensitive with changing pH. The effect of the added salt was slightly weak at pH 4-5.At the decomplexation stage, when permeate volume was equal to three times than that of the retentate, Eu removal efficiency (X) of Eu-PAA enhanced UF was 79.5% while that of Eu-PEI enhanced UF was 76.1%, and the polymer PAA and PEI could be recovered more than 97% and 93%, respectively. Eu in the retentate could be extracted effectively and the purified PAA and PEI solution were obtained. The recovered PAA and PEI solution was same as the fresh PAA and PEI solution in PEUF processes carried out by using the recovery recovered PAA and PEI as complex agents.

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