Surface activity measurements and quantum molecular modeling – The way to extraction behavior knowledge?

Staszak, Katarzyna; Wojciechowska, Irmina; Staszak, Maciej; Wieszczycka, Karolina

doi:10.1016/j.molliq.2020.114513

Cited by 3 publications

(4 citation statements)

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“…Differences in the structure of compounds have a significant impact on the course of extraction. Staszak et al [ 23 ] have examined the interfacial behavior of hydrophobic carboximidamide derivative extractants for Cu(II) extraction. The investigation confirmed that the structural variation of the extractants could not only create a substantial difference in interfacial behavior but could also have a significant effect on the extraction efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…The authors evidenced that the branched-chain carboximidamides in position 3 have the smallest steric hindrance, and thus have easier access to the water/organic interface in the model extraction system that results in better Cu(II) extraction efficiency (a surface extraction mechanism). Although the quaternary salts used as extractants in the present study are derived from some of the compounds studied in [ 23 ], their extraction behavior shows that decyl compounds are more efficient, suggesting that these compounds easier access the interface and are likely to be present there in higher concentration. It is opposite to the observations made by Staszak et al [ 23 ], and may result from the ionic nature of the presently studied extractants.…”

Section: Resultsmentioning

confidence: 99%

“…Although the quaternary salts used as extractants in the present study are derived from some of the compounds studied in [ 23 ], their extraction behavior shows that decyl compounds are more efficient, suggesting that these compounds easier access the interface and are likely to be present there in higher concentration. It is opposite to the observations made by Staszak et al [ 23 ], and may result from the ionic nature of the presently studied extractants. Their interfacial properties should be investigated in the future.…”

Section: Resultsmentioning

confidence: 99%

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Recovery of Palladium(II) and Platinum(IV) in Novel Extraction Systems

Wiecka¹,

Rzelewska-Piekut²,

Wojciechowska³

et al. 2021

Materials

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Recovery of platinum group metals (PGM) from complex aqueous solutions generated as a result of leaching of various spent materials (e.g., spent automotive converters) is a vital issue in the context of the circular economy. In this study pyridinium derivatives containing an imidoamide or imine moiety (i.e., 3-[1-(2-ethylhexyloxyimine)methane]-1-propylpyridinium chloride, 3-[1-(decyloxyimine)methane]-1-propylpyridinium chloride, 3-[1-(decyloxyimine)ethane]-1-propylpyridinium chloride and 4-[1-amine(2-ethylhexyloxyimine)]-1-propylpyridinium chloride) are proposed as novel extractants for recovery of palladium(II) and platinum(IV) from model chloride aqueous solutions. The results of liquid-liquid extraction from one-component solutions of palladium(II) or platinum(IV) showed that quaternary pyridinium salts can be used as effective extractants for platinum metal ions. Moreover, PGM extraction from a two-component mixture proved no evident selectivity in the transfer of one of the metal ions to the organic phase. As the best extractant among the investigated ones, D3EI-PrCl (with straight alkyl chain at substituent) can be pointed out, however, problems with effective stripping or phase disengagement after stripping should be indicated as a drawback of the organic phases used. Further investigation should focus on the improvement of the organic phase properties (e.g., increase in hydrophobicity of the extractants and addition of an organic phase modifier) towards stripping efficiency.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Recovery of Palladium(II) and Platinum(IV) in Novel Extraction Systems

Wiecka¹,

Rzelewska-Piekut²,

Wojciechowska³

et al. 2021

Materials

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“…2. The position of the N atom in the pyridine ring has a great influence on the selectivity of the extractant, 30 and when the N atom in the pyridine ring is in the ortho position, the steric hindrance of the extractant is greater than that when the N atom in the pyridine ring is in the para position. 31 Therefore, compared with 4PC, MSL211 may have a greater steric hindrance, thereby improving the selectivity toward Ni(II).…”

Section: Mechanism Analysis Of the High Selectivity Of Msl211 Toward ...mentioning

confidence: 99%

Direct Extraction of Ni(II) from Acidic Polymetallic Sulfate Media with a Novel Synergistic Extraction System of DNNSA-MSL211

Zheng

Cao

et al. 2023

ACS Sustainable Chem. Eng.

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Direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) is a bottleneck issue in the hydrometallurgy processes of laterite-nickel ore, spent batteries, and other secondary sources. One of the biggest challenges in achieving direct extraction of Ni(II) is the lack of stable and efficient extractants. Hence, a novel bipyridine extractant MSL211 was designed and synthesized in this paper. With its strong steric resistance and electrostatic interaction, MSL211 can form a stable eight-membered chelating ring with Ni(II), thereby having a high bonding ability toward Ni(II). Therefore, based on the high bonding ability of MSL211 toward Ni(II) and the low extraction capacity of DNNSA for Fe(III), an efficient synergistic extraction system of DNNSA-MSL211 was proposed. The synergistic extraction system of DNNSA-MSL211 realizes direct extraction of Ni(II) from Fe(III), Al(III), Ca(II), Mg(II), and Mn(II) without neutralization, precipitation, and solid/liquid separation processes, which are inevitable but problematic processes in the current hydrometallurgy processes for removing Fe(III), Al(III), and Mn(II). The effects of the molar ratios of DNNSA:MSL211, shaking time, temperature, O/A ratios, and equilibrium pH on the extraction behavior of Ni(II) were investigated. Under optimum conditions, the extraction efficiency of Ni(II) was as high as 97.62%, and the separation coefficient of Ni(II) over all impurities was greater than 400. To elucidate the mechanism of the high selectivity of DNNSA-MSL211 toward Ni(II), DFT calculations were carried out to calculate the binding energy (ΔE) and Gibbs free energy (ΔG(ext)) of the extraction process. Furthermore, this paper investigated the entire ″extraction-stripping″ process, demonstrating that the synergistic extraction system of DNNSA-MSL211 avoids neutralization, precipitation, and solid/liquid separation processes, minimizes hazardous waste generation, and shortens process flow while meeting the objectives of sustainable and clean production.

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