Synthesis of a Novel Dibenzylamide Derivative of p-tert-Octylcalix[4]arene and its Extraction Properties Towards Noble Metal Ions

2017 ◽  
Vol 70 (5) ◽  
pp. 450 ◽  
Author(s):  
Jee Young Kim ◽  
Yoga Priastomo ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Metal Ions ◽  
Contact Time ◽  
Nitric Acid Concentration ◽  
Precious Metals ◽  
Extractant Concentration ◽  
Acid Media ◽  
Slope Analysis ◽  
Extraction Properties

A N,N-dibenzylacetoamide derivative of p-tert-octylcalix[4]arene was synthesised and its solvent extraction of precious metals in nitric acid media was investigated for determining the effects of extractant concentration and contact time as well as nitric acid concentration in comparison with a N,N-diethylacetoamide derivative. The extraction properties with both derivatives exhibited a slight difference. The extraction reaction of divalent palladium with both derivatives is discussed by slope analysis. The stripping behaviour of the extractant loaded with silver and palladium is also described using various stripping solutions.

Effects of temperature on the extraction of U(VI) and Pu(IV) by tris(2-methylbutyl) phosphate from nitric acid media

2018 ◽  
Vol 106 (4) ◽  
pp. 281-289 ◽  
Author(s):  
A. Suresh ◽  
S. Jayalakshmi ◽  
Subramee Sarkar ◽  
N. Sivaraman
Keyword(s):  
Nitric Acid ◽  
Temperature Effects ◽  
Nitric Acid Concentration ◽  
Second Law ◽  
Extractant Concentration ◽  
Acid Media ◽  
Extraction Behavior ◽  
Ratio Data ◽  
Effects Of Temperature ◽  
Equilibrium Aqueous Phase

AbstractExtraction behavior of tris(2-methylbutyl) phosphate (T2MBP), a higher homologue of tri-n-butyl phosphate (TBP), in the extraction of U(VI) and Pu(IV) from nitric acid media has been evaluated in the present study. Distribution ratios for the extraction of these metal ions by T2MBP were measured as a function of equilibrium aqueous phase nitric acid concentration, extractant concentration and temperature to understand the temperature effects on extraction. Enthalpies of extraction of T2MBP/n-dodecane-U(VI)-HNO3and T2MBP/n-dodecane-Pu(IV)-HNO3systems were calculated from the distribution ratio data using “second law” method. The data reveal that the extraction of U(VI) by T2MBP is exothermic in nature, whereas that of Pu(IV) is endothermic.

scholarly journals Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant

2010 ◽  
Vol 75 (11) ◽  
pp. 1549-1557 ◽  
Author(s):  
Snehal Ghag ◽  
Suresh Pawar
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Hydrobromic Acid ◽  
Analysis Method ◽  
Acid Media ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2?2Cyanex-923 and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.

scholarly journals Evaluation of polybenzimidazole-based polymers for the removal of uranium, thorium and palladium from aqueous medium

2018 ◽  
Vol 5 (6) ◽  
pp. 171701 ◽  
Author(s):  
V. Vijaya Kumar ◽  
C. Ramesh Kumar ◽  
A. Suresh ◽  
S. Jayalakshmi ◽  
U. Kamachi Mudali ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Nitric Acid Concentration ◽  
The Other ◽  
Potential Candidate ◽  
Acid Media ◽  
Extraction Behaviour ◽  
Polymeric Resins ◽  
Dilute Nitric Acid

Four types of polybenzimidazole (PBI)-based polymers ( m -PBI, p -PBI, pyridine-based m -PBI and alkylated m -PBI) have been prepared and characterized. Extraction behaviour of heavy metal ions, viz. U(VI), Th(IV) and Pd(II), with these polymers was investigated. Distribution ratios for the extraction of these metal ions were measured as a function of nitric acid concentration. Extraction data reveal that, in general, p -PBI exhibits a higher distribution ratio for U(VI), Th(IV) and Pd(II) compared with the other polymeric resins evaluated in the present study. Column chromatography experiments were carried out with a solution of U(VI), Th(IV) and Pd(II) in dilute nitric acid media using columns packed with m - and p -PBI polymeric material for understanding the sorption and elution behaviour. The p -PBI-based resin has shown higher palladium sorption capacity (1.8 mmol g −1 ). The studies also established that p -PBI resin is a potential candidate material for the recovery of U(VI) and Th(IV) (capacity 0.22 mmol g −1 and 0.13 mmol g −1 ) from an aqueous stream, e.g. mine water samples.

scholarly journals Comparative Extraction of Aluminum Group Metals Using Acetic Acid Derivatives with Three Different-Sized Frameworks for Coordination

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 211
Author(s):  
Keisuke Ohto ◽  
Nako Fuchiwaki ◽  
Hiroaki Furugou ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Metal Ions ◽  
Spectroscopic Data ◽  
Equilibrium Constants ◽  
Structural Effects ◽  
Extraction Equilibrium ◽  
Ph Values ◽  
Slope Analysis ◽  
Coordination Sites ◽  
Extraction Properties

We prepared acetic acid derivatives using three different frameworks, calix[4]arene, alkenyltrimethylol, and trihydroxytriphenylmethane, which differ in the number and size of their coordination sites. We further investigated the extraction properties for aluminum group metal ions. All three extraction reagents exhibited increased extraction compared with the corresponding monomeric compounds, owing to structural effects. The extraction reaction and extraction equilibrium constants were determined using a slope analysis. Their extraction abilities, separation efficiencies, and potential coordination modes are discussed using the extraction equilibrium constants, half-pH values, and spectroscopic data. The calix[4]arene and trihydroxytriphenylmethane derivatives demonstrated allosteric co-extraction of indium ions (In3+) with an unexpected stoichiometry of 1:2.

scholarly journals Molten solvent extraction behavior of palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone at 60 °C

2007 ◽  
Vol 5 (3) ◽  
pp. 912-921 ◽  
Author(s):  
Bo Peng ◽  
Xiaojun Guo ◽  
Xuefen Mao ◽  
Jinzhang Gao
Keyword(s):  
Solvent Extraction ◽  
Precious Metal ◽  
Extraction Efficiency ◽  
Equilibrium Temperature ◽  
Paraffin Wax ◽  
Analysis Method ◽  
Extractant Concentration ◽  
Slope Analysis ◽  
Extraction Behavior ◽  
Ph Range

AbstractThe solvent extraction behavior of precious metal palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazone (PMBP) into molten paraffin wax has been studied in the temperature range from 55 to 75 °C. The complex consisting of PMBP and palladium was extracted into molten wax phase in the pH range from 1.0 to 3.5 at 60 °C. The extraction efficiency was up to 97% at the experimental pH. The stoichiometry of the extracted species of palladium was determined on the basis of slope analysis method. The effects of time to achieve equilibrium, temperature, and extractant concentration on the extraction were discussed. The thermodynamic data indicate that the extraction is an endothermic reaction and the increase of temperature promotes the extraction of palladium into molten paraffin wax and the extraction of palladium with PMBP is entropy controlled at high temperatures.

Extraction Properties of P(O)-Modified N-Aryl-Carbamoylmethylphosphine Oxides in Nitric Acid Media

2014 ◽  
Vol 32 (4) ◽  
pp. 408-423 ◽  
Author(s):  
A. N. Turanov ◽  
V. K. Karandashev ◽  
N. M. Vinogradova ◽  
E. V. Sharova ◽  
O. I. Artyushin
Keyword(s):  
Nitric Acid ◽  
Acid Media ◽  
Carbamoylmethylphosphine Oxides ◽  
Extraction Properties
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