Preparation and Metal Extraction Behavior of Macrocyclic Complexing Agent Bearing Trifluoromethanesulfonamide Deprotonating Groups

1993 ◽  
Vol 66 (2) ◽  
pp. 432-436 ◽  
Author(s):  
Hirotsugu Kido ◽  
Mizuo Maeda ◽  
Makoto Takagi
Keyword(s):  
Metal Extraction ◽  
Complexing Agent ◽  
Extraction Behavior

Synthesis and metal extraction behavior of pyridine and 1,2,4-triazole substituted calix[4]arenes

2010 ◽  
Vol 68 (3-4) ◽  
pp. 369-379 ◽  
Author(s):  
Ashok Kumar ◽  
Pratibha Sharma ◽  
Bhagwan Lal Kalal ◽  
Lal Kumar Chandel
Keyword(s):  
Metal Extraction ◽  
Extraction Behavior

COMPARATIVE EXTRACTION OF Mn AND Pb USING EDTA AND CITRATE TO ASSESS THEIR MOBILITY FROM TWO DUMPSITES IN ZARIA METROPOLIS

2021 ◽  
Vol 5 (1) ◽  
pp. 558-565
Author(s):  
Comfort Samuel-Okey ◽  
V. O. Ajibola
Keyword(s):  
Soil Washing ◽  
Metal Extraction ◽  
Complexing Agents ◽  
Complexing Agent ◽  
High Permeability ◽  
Time Intervals ◽  
Extraction Capacity ◽  
Physiochemical Parameters ◽  
Low Levels ◽  
Target Metal

An estimate of the labile fractions of different trace metals (Mn and Pb) in soil from two dumpsites with complexing agents (EDTA and Citrate) was carried out. The dump sites used for this study receives both commercial and domestic wastes. Physiochemical parameters and the total metal concentrations of the soil was determined, extraction with EDTA and Citrate were used to study the potential metal extraction capacity at different time intervals and the extraction rates of  metal released as a function of time (between 0 to 24 hr). The relatively low levels of silt, clay, organic matter and CEC indicates high permeability, hence leachability of heavy metals in the soil and suggest that it might be amenable to remediation by soil washing. The removal efficiency showed that complete solubilization of metals did not occur, as not all the complexing agents added to the soil, was bound to the target metal. This might be due to the presence of other ions such as Ca and Fe which form relatively high stable complexes. EDTA yielded much more than citrate for both metals under consideration. Lead was extracted more than Manganese, which suggest Lead has been more labile in solution than Manganese and EDTA as a stronger complexing agent than citrate. The level of extraction was constant for the period of 60 min to 720 min after which it increased considerably

scholarly journals Electron Densities & Cyclo-Voltammetry Studies of Mg, Al and Ca Calix-Aren Complexes

2020 ◽  
Vol 9 (3) ◽  
pp. 1320-1332
Keyword(s):  
Functional Groups ◽  
Metal Ion ◽  
Electrical Potential ◽  
Metal Extraction ◽  
Cavity Size ◽  
Electron Densities ◽  
Extraction Behavior ◽  
The Impact

Calixarenes are preferable for metal extraction because of the easy synthesis of a great number of derivatives, which allows comparing the impact of cavity size, conformation, functional groups, and other factors on the extraction behavior, and the flexibility to design a proper ligand to recognize a metal ion selectively. In this work, theoretically, it has been discussed on the specific Calix[n] and related cation in point of density and electrical potential via electron densities & cycle-voltammetry studies.

scholarly journals Comparison of Extraction Ability between a Mixture of Alamine 336/Aliquat 336 and D2EHPA and Ionic Liquid ALi-D2 from Weak Hydrochloric Acid Solution

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1678
Author(s):  
Viet Nhan Hoa Nguyen ◽  
Minh Nhan Le ◽  
Man Seung Lee
Keyword(s):  
Ionic Liquid ◽  
Metal Ion ◽  
Extraction Efficiency ◽  
Ph Control ◽  
Metal Extraction ◽  
Aliquat 336 ◽  
Solution Ph ◽  
Remarkable Effect ◽  
Extraction Behavior ◽  
Alamine 336

The development of extraction systems to improve the extraction efficiency of metals using commercial extractants and ionic liquids is of importance. The extraction behavior of Co(II) between mixture of Alamine 336/Aliquat 336 and D2EHPA and synthesized ionic liquid ALi-D2 was compared in this work. Some factors, such as equilibrium pH, properties of the extractants, and concentration of components in the mixture had a remarkable effect on the extraction of Co(II). The interactions occurring in the mixtures as well as the change in solution pH were analyzed. Co(II) was completely extracted by ionic liquid when equilibrium pH was higher than 6.5, while it was difficult to extract Co(II) by employing the mixture of D2EHPA and Alamine 336/Aliquat 336. The formation of ionic liquid in the mixture of D2EHPA and Aliquat 336 was verified through FT-IR spectra. In addition, the competition extraction of hydrogen ion and Co(II) by ionic liquid ALi-D2 was explained. Among the three kinds of extractants, the ionic liquid showed the best extraction efficiency for Co(II) and pH control from weak acidic solutions. The present study provides valuable information on the extraction behavior of metal ion by the mixtures of commercial extractants, and thus can give some light on the development of metal extraction systems.

scholarly journals Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1345
Author(s):  
Sun-Woo Nam ◽  
Sang-Min Park ◽  
Mohammad Zarar Rasheed ◽  
Myung-Suk Song ◽  
Do-Hyang Kim ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Grain Boundaries ◽  
Microstructural Analysis ◽  
Metal Extraction ◽  
Phase Decomposition ◽  
Extraction Percentage ◽  
Extraction Behavior ◽  
Extraction Reaction ◽  
The Matrix ◽  
Phase Proceeds

During the liquid metal extraction reaction between a Nd-Dy-Fe-B magnet and liquid Mg, Nd rapidly diffuses out of the magnet, whereas Dy is not extracted due to the reaction with the matrix and the formation of Dy2Fe17 phase. In addition, theDy2O3 phase exists at the grain boundaries. Until now, only the effect of the Dy2O3 phase on the extraction of Dy has been reported. In this study, the effect of the Dy2Fe17 phase on the extraction of Dy from the Nd-Dy-Fe-B magnet was investigated in liquid Mg. The formation of the Dy2Fe17 phase during the reaction between Mg and matrix (RE2Fe14B) was first examined using a thermodynamical approach and confirmed by microstructural analysis. It was observed that Dy extraction was dominated by Dy2Fe17 phase decomposition from 3 h to 24 h, followed by Dy2O3 phase dominant reaction with Mg. Comparing the activities of the Dy2Fe17 phase and the Dy2O3 phase, the reaction of Dy2Fe17 is dominant, as compared to the Dy2O3 phase. Finally, at 48 h, the high Dy extraction percentage of 93% was achieved. As a result, in was concluded that the Dy2Fe17 phase acts as an obstacle in the extraction of Dy. In the future, if research to control the Dy2Fe17 phase proceeds, it will be of great importance to advance the recycling of Dy.

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