scholarly journals Adsorption performance of functionalized chitosan–silica hybrid materials toward rare earths

2014 ◽  
Vol 2 (45) ◽  
pp. 19415-19426 ◽  
Author(s):  
Joris Roosen ◽  
Jeroen Spooren ◽  
Koen Binnemans
Keyword(s):  
Rare Earth ◽  
Hybrid Materials ◽  
Rare Earths ◽  
Rare Earth Ions ◽  
Adsorption Performance ◽  
Separation Of Mixtures ◽  
Silica Hybrid

Functionalized chitosan–silica hybrid materials were synthesized, characterized and used for adsorption of rare-earth ions. These adsorbents can be used for the separation of mixtures of rare-earths.

Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone

2011 ◽  
Vol 335-336 ◽  
pp. 1428-1432 ◽  
Author(s):  
Zhong Wei Pan ◽  
Chang Ma ◽  
Ying Wu Zhang ◽  
Yu Xia Huang ◽  
Xing Lin Chen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Rare Earths ◽  
Liquid Extraction ◽  
Rare Earth Ions ◽  
Extraction System ◽  
Tetraacetic Acid ◽  
Extraction Percentage ◽  
Extraction Solvent ◽  
Extraction Behavior

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.

The optical spectrum of UVLED excitation using NTC nanometer particles to replace rare earth doping

MRS Advances ◽  
2019 ◽  
Vol 4 (33-34) ◽  
pp. 1895-1904
Author(s):  
Lihong Su ◽  
Kan Chen ◽  
Yongqiang Liu ◽  
ZiAo Zou ◽  
Lihua Su
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Optical Spectrum ◽  
Low Cost ◽  
Rare Earth Ions ◽  
Rare Earth Doping ◽  
Phosphor Material ◽  
Light Emitting ◽  
Luminescence Efficiency ◽  
Nickel Copper

Abstract:Ultraviolet light-emitting diodes (UVLEDs) with phosphor materials have considerable advantages over traditional illumination devices. Doping with rare earth ions can modify the optical spectrum of phosphor materials, but rare earths are very expensive. Thus, replacing rare earths with a common material would provide a great potential for the wide application in the future. In this study, we discovered that a novel type of semiconductor nanometre powder, namely manganese cobalt nickel copper oxide (MCNC), is able to emit blue-green wavelength spectrum when exited by 365-400nmUVLED. In addition, MCNC shows less attenuation of luminescence efficiency than other UVLED phosphor materials doped with rare earths with temperature increase. It is thus concluded that MCNC is a promising low-cost material to replace rare earths to adjust the optical spectrum wavelength of UVLED. This is the first time that nano-scale MCNC is reported to possess the property to change the optical spectrum wavelength of UVLED. This provides a new mechanical and nanometer phosphor material without rare earth doping to shift the wavelength spectrum.

scholarly journals Separation of rare-earth ions from ethylene glycol (+LiCl) solutions by non-aqueous solvent extraction with Cyanex 923

RSC Advances ◽  
2017 ◽  
Vol 7 (72) ◽  
pp. 45351-45362 ◽  
Author(s):  
Nagaphani Kumar Batchu ◽  
Tom Vander Hoogerstraete ◽  
Dipanjan Banerjee ◽  
Koen Binnemans
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Ethylene Glycol ◽  
Rare Earths ◽  
Rare Earth Ions ◽  
Aqueous Solvent ◽  
Cyanex 923

Mixtures of rare earths are separation by non-aqueous solvent extraction with two immiscible organic phases.

Zn2−aGeO4:aRE and Zn2Ge1−aO4:aRE (RE = Ce3+, Eu3+, Tb3+, Dy3+): 4f–4f and 5d–4f transition luminescence of rare earth ions under different substitution

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102183-102192 ◽  
Author(s):  
Qiongyu Bai ◽  
Zhijun Wang ◽  
Panlai Li ◽  
Shuchao Xu ◽  
Ting Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Different Characteristics

Generally, luminescent properties of rare earth ions doped host can be tuned by controlling the host composition, that is, when substituted for different cations of host, the rare earths ions can present different characteristics.

Tannin-grafted aminated silicon adsorbents: adsorption performance of rare earth ions coexistence

2016 ◽  
Vol 57 (56) ◽  
pp. 27386-27395 ◽  
Author(s):  
Rui-lin Yang ◽  
Ya-chun Liu ◽  
Qian Liu ◽  
Tian-tian Xu ◽  
Ke Zhu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Adsorption Performance

SYSTHESIS AND OPTICAL PROPERTIES OF RARE EARTHS DOPED NANO-SEMICONDUCTORS AND THEIR APPLICATIONS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4294-4301 ◽  
Author(s):  
XINWEI ZHAO ◽  
SUSUMU HARAKO ◽  
SHINRI NOGUCHI ◽  
SHUJI KOMURO
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Optical Transition ◽  
Rare Earth Ions ◽  
Electron Hole ◽  
Transition Dynamics ◽  
Time Resolved ◽  
Co Doping ◽  
Nanocrystalline Si ◽  
The Rare Earth

Er and Yb have been doped into nanocrystalline Si and ZnO thin films. Sharp and intense photoluminescence (PL) lines related to intra-4f transitions in the rare earth ions were observed. The optical transition dynamics of the rare earth ions were investigated by time-resolved PL measurements. It was demonstrated that a nano-meter sizing of Si widened the energy bandgap and led to an increase of doping densities of the rare earths. It was also shown that the Er-related PL gave rise to different features under direct and indirect excitations indicating a strong interaction of electron-hole pairs in the host with 4f electrons in the rare earth ions. A co-doping effect of Yb and Er into nanocrystalline Si was presented also. Our results suggested a rare earth-rare earth coupling between the Yb 3+ ions and the Er 3+ ions, which transferred the energy from Yb to Er and enhanced the 1.54 μm PL of Er.

Efficient separation of transition metals from rare earths by an undiluted phosphonium thiocyanate ionic liquid

2016 ◽  
Vol 18 (23) ◽  
pp. 16039-16045 ◽  
Author(s):  
Alok Rout ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Rare Earth ◽  
Transition Metal ◽  
Transition Metals ◽  
Metal Ions ◽  
Rare Earths ◽  
Transition Metal Ions ◽  
Rare Earth Ions ◽  
Efficient Separation

Efficient separation of transition metal ions from their mixture with rare-earth ions was achieved by extraction with a phosphonium thiocyanate ionic liquid.

Sensibilisierte IR-Emission der dreiwertigen Seltenen Erden in Sr3La2W2O12 / Sensitized IR Emission of the Trivalent Rare Earths in Sr3La2W2O12

1984 ◽  
Vol 39 (11) ◽  
pp. 1115-1119
Author(s):  
R. Braun ◽  
S. Kemmler-Sack
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Rare Earths ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Trivalent Rare Earth ◽  
Ir Emission

By activation of the host lattice Sr3La2W2O12 with the trivalent rare earth ions Nd, Ho. Er. Tm and Yb an intense IR emission is observed, which can be sensitized by energy transfer from Nd3+ to Yb3+, from Er3+ to Ho3+ or Tm3+, from Tm3+ to Ho3+, and from Yb3+ to Ho3+ or Tm3+. For all other couples of trivalent rare earth ions no significant energy transfer is detected.

scholarly journals Simultaneously Remove and Visually Detect Ce4+ Based on Nanocomposite of UiO-66-NH2/CPA-MA

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Xiaoqiu Tang ◽  
Guanghui Wu ◽  
Tao Wang ◽  
Pinghua Chen ◽  
Jiezeng Chen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
High Capacity ◽  
High Adsorption ◽  
Kinetics Of Adsorption ◽  
Effective Strategies ◽  
Adsorption Performance ◽  
Kinetics Of

Effective strategies to deal with rare earth pollution are urgently needed due to the overexploitation of rare earths resource. In this study, a novel nanocomposite of UiO-66-NH2/CPA-MA denoted as UA was successfully synthesized, which can simultaneously remove and detect Ce4+ in water. The hybrid consists of UiO-66-NH2 and CPA-MA. Based on the high adsorption performance of UiO-66-NH2, it can remove Ce4+ with high capacity by adsorption. Moreover, it can change its color from olive drab to light cyan depending on the adsorbed Ce4+ concentration, and the chroma is linearly related to the Ce4+ concentration. So, UA can be used to qualitatively and quantitatively detect Ce4+ by its color changing. The kinetics of adsorption course was investigated in details. The anti-inference ability of the nanocomposite in coexisting systems was carefully evaluated. The results indicate that UiO-66-NH2/CPA-MA is highly potential to deal with Ce4+ pollutions due to its bifunctionality.

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