Ionic Liquid (IL) Cation and Anion Structural Effects on Metal Ion Extraction into Quaternary Ammonium-based ILs

Wankowski, James L.; Dietz, Mark L.

doi:10.1080/07366299.2015.1110410

Cited by 18 publications

(5 citation statements)

References 39 publications

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“…The EMIMNTf2 proved to be a good extractant as it showed good performance in removing Ni-EP as it recorded the percentage of removal more than 20% in any reaction times and temperature compared to EMIMOS. Wankowski and Dietz stated that the metal ion exchange favor the hydrophobic anion [18]. Increasing anion hydrophobicity reduced the possibility of ILs dissolved in aqueous solvent thus enhancing the removal of Ni-EP.…”

Section: Effect Of Anions Towards Removal In Model Oilmentioning

confidence: 99%

Fundamental Studies on Etioporphyrin Removal from Model Oil Using Toluene Assisted Ionic Liquids

et al. 2021

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The surging demand for unconventional oil has driven the research initiative to extract heavy metals from heavy crude oil to ease the upgrading processes and produce lighter-ends hydrocarbon to be supplied in the field of transportation and petrochemical industry. Despite multiple methods have been discovered for metal removal, the low efficiency removal had enlightened the need of using ionic liquids. Three ionic liquids are studied in this project which are 1-butyl-3-methylimidazolium octylsulfate (BMIMOS), 1-ethyl-3-methylimidazolium octylsulfate (EMIMOS) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMNTf2) on extraction of two complex heavy metals; nickel etioporphyrin and vanadium oxide etioporphyrin. The experiments were tested at temperature ranging from 30 °C to 90 °C and 30 minutes to 90 minutes of mixing time. In addition, samples were analysed through UV-Visible Spectroscopy (UV-Vis) and Fourier Transform Infrared (FTIR) to determine the effectiveness of the extraction and study the functional group presence in the samples accordingly. Results revealed the overall maximum extraction efficiency of 22% of Ni-EP was recorded by EMIMNTf2. The changing in reaction temperature and time did not affect the percentage of Ni-EP removal by EMIMNTf2.

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Section: Effect Of Anions Towards Removal In Model Oilmentioning

confidence: 99%

Fundamental Studies on Etioporphyrin Removal from Model Oil Using Toluene Assisted Ionic Liquids

et al. 2021

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“…It is possible for multiple extraction mechanisms to co-exist within similar solvent extraction systems. The factors determining the relative importance of an extraction scheme include hydrophobicity of the IL cation (Jensen et al, 2002;Dietz et al, 2003) and anion (Jensen et al, 2003;Luo et al, 2006) and the hydration energy of the aqueous metal complex (Garvey et al, 2012;Wankowski & Dietz, 2016). The composition of the aqueous phase can also influence the extraction efficiency for a particular solvent extraction.…”

Section: Macroscopic Solvation and Extraction Mechanismsmentioning

confidence: 99%

“…Systematic studies on the extraction of alkaline and alkali earth cation with DCH18C6 crown ether NTf2] show that the predominant extraction mechanisms, ion-exchange or neutral complex extraction, depend on the hydrophobicity of the IL cation, the Lewis acidity of the metal ion and the aqueous phase nitrate anion concentration (Hawkins et al, 2012;Wankowski & Dietz, 2016). Jensen et al (2002) reported that for such systems, the cation exchange extraction mechanism is not driven by the strength of metal-extractant complexation but by the energetically favourable solvation energy obtained from the release of the IL cation to the aqueous phase.…”

Section: Neutral Extractantsmentioning

confidence: 99%

Recovery of metals from waste electrical and electronic equipment (WEEE) using unconventional solvents based on ionic liquids

Schaeffer

Passos

Billard

et al. 2018

Critical Reviews in Environmental Science and Technology

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Waste electrical and electronic equipment (WEEE) is the fastest growing type of waste globally and is an important challenge due to its heterogeneity, intrinsic toxicity and potential environmental impact. However, WEEE also represents an important secondary source of critical and valuable elements and must be viewed as a resource within the context of a circular economy. The use of ionic liquids (ILs) to recover metals from WEEE is reviewed with a special emphasis on the use of ILs in leaching and solvent extraction processes. The advantages of ILs as a reaction medium compared to existing conventional solvents lies in their tuneability and potential environmental benefits. Many studies have used ILs for the selective extraction and purification of metals from WEEE, particularly from waste fluorescent lamp phosphor and batteries containing rare-earth elements with promising results. However, significant barriers remain to the commercial use of ILs for treating WEEE and key barriers to progress are identified. In particular more focus is required to improve upstream collection and separation of WEEE, as this would greatly increase the potential to use selective, more efficient, ILs for metal recovery.

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“…In the following study, the extraction mechanism of cation exchange was proposed by Dietz through investigating the ILs extraction systems aimed at the separation of Sr 2+ . 25 Monoaza-substituted crown ethers in ILs were investigated for the separation of Sr 2+ and Cs + from the aqueous phase. 26 Visser et al studied the extraction of Sr 2+ , Cs + and Na + using DCH18C6 and Dtb18C6 dissolved in the room temperature ILs C n mimPF 6 (n = 4, 6, 8).…”

Section: Introductionmentioning

confidence: 99%

The extraction of SR2+ with dicyclohexano-18-crown-6 in conventional organic solvent and ionic liquid diluents

et al. 2020

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90 Sr (t 1/2 = 28.8 a), one of the most significant fission products in high-level radioactive liquid waste (HLLW), contributes to a large part of the heat load and radiation. Removal of 90 Sr from the HLLW is beneficial for the final treatment of nuclear waste. In this paper, the extraction of Sr 2+ was carried out using dicyclohexano-18-crown-6 (DCH18C6) in a variety of diluents including conventional organic solvents and novel ionic liquid solvents. The effect of several factors, such as nitric acid concentration, crown ether concentration and initial strontium concentration on the extraction of Sr 2+ have been studied comprehensively. The higher distribution ratio and the stripping efficiency of Sr 2+ were obtained with the binary diluents consisted of n-octanol and acetylene tetrachloride, which were compared with that using pure n-octanol as diluent. As for the C n mimNTf 2 (n = 2, 4, 6) ionic liquid solvent systems, the distribution ratio of Sr 2+ was much higher in the nitric acid medium with low concentration than in the traditional solvent systems. The results showed that D C2mimNTf2 > D C4mimNTf2 > D C6mimNTf2 , which indicated that shorter carbon chain benefits the extraction of Sr 2+ .

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Ionic Liquid (IL) Cation and Anion Structural Effects on Metal Ion Extraction into Quaternary Ammonium-based ILs

Cited by 18 publications

References 39 publications

Fundamental Studies on Etioporphyrin Removal from Model Oil Using Toluene Assisted Ionic Liquids

Fundamental Studies on Etioporphyrin Removal from Model Oil Using Toluene Assisted Ionic Liquids

Recovery of metals from waste electrical and electronic equipment (WEEE) using unconventional solvents based on ionic liquids

The extraction of SR2+ with dicyclohexano-18-crown-6 in conventional organic solvent and ionic liquid diluents

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