Solvent extraction mechanism of pertechnetate with tetraphenylarsonium chloride

1994 ◽  
Vol 178 (2) ◽  
pp. 237-243 ◽  
Author(s):  
T. Omori ◽  
Y. Muraoka ◽  
H. Suganuma
Keyword(s):  
Solvent Extraction ◽  
Extraction Mechanism ◽  
Tetraphenylarsonium Chloride

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

scholarly journals Solvent extraction mechanism of 2-(2-pyridylazo)-1-naphthol-4-sulfonate and its divalent metal complex anions with tetrabutylammonium cation using 1-nonanol/octane mixed solvents

2003 ◽  
Vol 52 (9) ◽  
pp. 731-739 ◽  
Author(s):  
Takahiro UCHIDA ◽  
Takashi YASUI ◽  
Tetsuyoshi NAITO ◽  
Hiromichi YAMADA
Keyword(s):  
Solvent Extraction ◽  
Metal Complex ◽  
Mixed Solvents ◽  
Divalent Metal ◽  
Extraction Mechanism ◽  
Complex Anions

Lithium recovery from Li3PO4 leaching liquor: Solvent extraction mechanism of saponified D2EHPA system

2020 ◽  
Vol 249 ◽  
pp. 117161 ◽  
Author(s):  
Yunfeng Song ◽  
Zhongwei Zhao ◽  
Lihua He
Keyword(s):  
Solvent Extraction ◽  
Extraction Mechanism

Mechanism of phase transfer of uranyl ions: a vibrational sum frequency generation spectroscopy study on solvent extraction in nuclear reprocessing

2018 ◽  
Vol 20 (47) ◽  
pp. 29588-29590 ◽  
Author(s):  
Ryoji Kusaka ◽  
Masayuki Watanabe
Keyword(s):  
Solvent Extraction ◽  
Aqueous Solutions ◽  
Phase Transfer ◽  
Sum Frequency Generation ◽  
Uranyl Ions ◽  
Spectroscopy Study ◽  
Extraction Mechanism ◽  
Sum Frequency ◽  
Sum Frequency Generation Spectroscopy ◽  
Nuclear Reprocessing

VSFG study on interfaces of TBP/uranyl aqueous solutions shows that uranyl ion does not form complexes with TBP at the interface, and proposes a new extraction mechanism.

Solvent extraction mechanism and precipitation stripping of bismuth (III) in hydrochloric acid medium by tributyl phosphate

2016 ◽  
Vol 23 (12) ◽  
pp. 3085-3091 ◽  
Author(s):  
Zhi-jian Wang ◽  
Feng-hua Ding ◽  
Jing Zhan ◽  
Chuan-fu Zhang
Keyword(s):  
Solvent Extraction ◽  
Hydrochloric Acid ◽  
Acid Medium ◽  
Tributyl Phosphate ◽  
Extraction Mechanism ◽  
Hydrochloric Acid Medium ◽  
Precipitation Stripping

Solvent Extraction Process and Extraction Mechanism for Lithium Recovery from High Mg/Li-Ratio Brine

2019 ◽  
Vol 52 (6) ◽  
pp. 508-513 ◽  
Author(s):  
Shangqing Chen ◽  
Xuejiao Nan ◽  
Nan Zhang ◽  
Long Li ◽  
Xiaoping Yu ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Extraction Mechanism

Solvent Extraction of Zinc from Acidic Calcium Chloride Solutions by Cyanex 923

2000 ◽  
Vol 2000 (4) ◽  
pp. 188-189 ◽  
Author(s):  
Susana Martínez ◽  
Francisco José Alguacil
Keyword(s):  
Experimental Data ◽  
Solvent Extraction ◽  
Calcium Chloride ◽  
Phosphine Oxide ◽  
Zinc Chloride ◽  
Chloride Ions ◽  
Extraction Mechanism ◽  
Chloride Solutions ◽  
Slope Analysis ◽  
Cyanex 923

The reaction of zinc chloride with Cyanex 923 (phosphine oxide) in Solvesso 100 has been studied from acidic calcium chloride solutions. The distribution coeffient of zinc is independent of equilibrium pH, thus, suggesting a solvation extraction mechanism. Experimental data indicate that the reaction is exothermic (Δ H° = −55.2 kJmol−1). Slope analysis for the system at various Cyanex 923 concentrations reveals the formation in the loaded organic phases of species which probable 1:2 (Zn: Cyanex 923) stoichiometries. The stoichiometric factor of water in the extraction reaction was found to be 0, 1 or 2, whereas experimental data indicated that two chloride ions are involved for each metal extracted.

Insight into the Deep Eutectic Solvent Extraction Mechanism of Flavonoids from Natural Plant

2020 ◽  
Vol 8 (51) ◽  
pp. 19169-19177
Author(s):  
Dan Cao ◽  
Qian Liu ◽  
Wenqiang Jing ◽  
Haiyuan Tian ◽  
Hongyuan Yan ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Deep Eutectic Solvent ◽  
Extraction Mechanism ◽  
Natural Plant ◽  
Insight Into
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