Direct in situ supercritical fluid extraction of neodymium ion from its oxide using thenoyl tri fluoro acetone–tri butyl phosphate–methanol in carbon dioxide

Vincent, Tessy; Mukhopadhyay, Mausumi; Wattal, P.K.

doi:10.1016/j.supflu.2008.10.022

Cited by 24 publications

(19 citation statements)

References 8 publications

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“…Supercritical CO 2 could find applications in the field of nonaqueous solvent extraction and solvent leaching [75][76][77][78]. Of particular interest are the promising combinations of supercritical CO 2 with TBP-HNO 3 and supercritical CO 2 with fluorinated b-diketones as solvents for direct solid leaching [79][80][81][82][83]. CO 2 becomes a supercritical fluid at its critical temperature (31.10°C) and critical pressure (72.8 atm) [84].…”

Section: Organic Solvents For Solvometallurgy Green Solventsmentioning

confidence: 99%

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Binnemans

Jones

2017

J. Sustain. Metall.

234

187

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This position paper introduces the reader to the concept of solvometallurgy, the term used to describe the extraction of metals from ores, industrial process residues, production scrap, and urban waste using non-aqueous solutions. Here, non-aqueous is not used to imply anhydrous, but rather a low water content. The unit operations are as follows: solvent leaching; separation of the residue; purification of the leach solution by non-aqueous solvent extraction or non-aqueous ion exchange; and metal recovery by precipitation or electrolysis in non-aqueous electrolytes. Solvometallurgy is similar to hydrometallurgy in that both the branches of extractive metallurgy use lowtemperature processes, but with solvometallurgy, there is no discrete water phase. Both branches use organic or inorganic solvents (excluding water in the case of solvometallurgy). However, for solvometallurgical processes to be sustainable, they must be based on green solvents, which means that all toxic or environmentally harmful solvents must be avoided. Solvometallurgy is complementary to pyrometallurgy and hydrometallurgy, but this new approach offers several advantages. First, the consumption of water is very limited, and so the generation of wastewater can be avoided. Second, the leaching and solvent extraction can be combined to form a single step, resulting in more simplified process flow sheets. Third, solvent leaching is often more selective than leaching with acidic aqueous solutions, leading to reduced acid consumption and fewer purification steps. Fourth, solvometallurgy is useful for the treatment of ores rich in soluble silica (e.g., eudialyte) because no silica gel is formed. In short, solvometallurgy is in a position to help develop the near-zero-waste metallurgical processes, and with levels of energy consumption that are much lower than those with the high-temperature processes. The Technology Readiness Level (TRL) of this emerging branch of extractive metallurgy is still low (TRL = 3-4), which is a disadvantage for short-term implementation, but offers a great opportunity for further research, development, and innovation.

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Section: Organic Solvents For Solvometallurgy Green Solventsmentioning

confidence: 99%

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Binnemans

Jones

2017

J. Sustain. Metall.

234

187

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“…The lanthanide β-diketonate complexes are prepared by precipitation method as described in the literature [6,11]. The solution is then subjected to centrifugation and washing with water.…”

Section: Synthesis Of Lanthanide(iii) Complexesmentioning

confidence: 99%

“…Here 'y' represents the number of hydrated water molecules. The reaction of the enolic TTA to form the chelate with the metal ion is accompanied by the deprotonation of the ligand [11]. The common bases that are used for the deprotonation of β-diketones are ammonia, sodium hydroxide, piperidine or pyridine.…”

Section: 3a Principle For the Preparation Of Lanthanide Complexesmentioning

confidence: 99%

Structural and optical properties of synthesized poly(methyl methacrylate) (PMMA) and lanthanide $$\upbeta $$-diketonate complexes incorporated electrospun PMMA nanofibres for optical devices

Philip

Thomas²,

Jose

et al. 2019

Bull Mater Sci

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Fabrication of electrospun nanofibres is the glittering area of research because of their flexible characteristics and numerous applications in almost all walks of life and technology. Poly(methyl methacrylate) (PMMA) is one of the significant and interested synthetic polymers in the recent research because of their characteristic properties like higher environmental stability, resistance to attack by moulds and enzymes, commercial availability, easiness to handle, etc. In the present study, pristine PMMA nanofibres with diameters of 60-150 nm with 109 nm as the most distributed one are prepared by an electrospinning method using a binary solvent mixture. An enhancement in the intensity of visible photoluminescence emission is observed in PMMA nanofibres embedded with samarium and neodymium β-diketonate complexes. The morphological incorporation of samarium and neodymium β-diketonate complexes in PMMA nanofibres and material composition of the samples are examined by high resolution electron microscopy analyses. The amorphous nature and molecular bonding of pure PMMA nanofibres and incorporated fibre complexes are elucidated through structural and molecular analyses. The supreme optical absorptions and reemissions of samarium and neodymium β-diketonate complexes embedded in the pure PMMA fibre sample in the visible region indicate not only their application in lighting or display devices, but also as active materials in organic light emitting diodes for new era curved/rolled display devices.

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“…Carbon dioxide is a non-polar gas and is suitable for solubility of nonpolar substances. In order to increase the solubility of polar species in SC-CO 2 , the polarity of supercritical fluid must be increased via utilization of co-solvents such as methanol, ethanol (Niehaus et al, 1997;Tessy et al, 2009;Ghoreishi et al, 2009). Extraction of metal ions from an aqueous phase into CO 2 is influenced by the presence of carbonic acid which lowers the pH of the aqueous phase to approximately 3.…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO<sub>2</sub> Extraction of Heavy Metals Cu, Zn and Cd from Aqueous Solution using D ithizone as Chelating Agent

Halili

Mele

Arbneshi

et al. 2015

American Journal of Applied Sciences

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Metal ions in liquid samples can be extracted by supercritical CO 2 , containing a suitable ligand. This paper presents the first experimental data for the extraction of three heavy metals Cu, Zn and Cd from aqueous samples in the presence of Dithizone as chelating agent. Extractions by supercritical CO 2 have been performed at 120 bars with 50°C used dynamic technique. After adding the CO 2 on the aqueous metal solution, the pressure and temperature were set and extraction was performed in three periodical times; 30, 60 and 120 min at constant temperature and pressure with a flow rate of CO 2 2 mL min −1 . After the extraction, the CO 2 was released slowly through a restrictor. Methanol was used as a modifier (v/v) 10% and the pH value was set (10). After the extraction process, the remaining aqueous solution in the extractor was analyzed for its metal content by Atomic Absorption Spectrophotometer (AAS), determining the recovery of the metal by CO 2 . During dynamic extraction noticed increased of extraction in function of time for all three metals; Cu (61.12-73.52%, RSD = 2.694, n = 3); Zn (78.33-87.00%, RSD = 1.243, n = 3) and Cd (70.60-82.40%, RSD = 2.227, n = 3).

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Direct in situ supercritical fluid extraction of neodymium ion from its oxide using thenoyl tri fluoro acetone–tri butyl phosphate–methanol in carbon dioxide

Cited by 24 publications

References 8 publications

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Solvometallurgy: An Emerging Branch of Extractive Metallurgy

Structural and optical properties of synthesized poly(methyl methacrylate) (PMMA) and lanthanide $$\upbeta $$-diketonate complexes incorporated electrospun PMMA nanofibres for optical devices

Supercritical CO<sub>2</sub> Extraction of Heavy Metals Cu, Zn and Cd from Aqueous Solution using D ithizone as Chelating Agent

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