Ionic liquids and deep eutectic solvents in wastewater treatment: recent endeavours

Sarkar, Abhra; Pandey, Siddharth

doi:10.1007/s13762-023-04865-1

Cited by 4 publications

(2 citation statements)

References 203 publications

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“…Apart from the numerous advantages of DESs, which include cost-effectiveness, low toxicity, high thermal stability, low volatility, and ease of preparation from commodity chemicals, a subclass of DESs displays hydrophobicity, facilitating the efficient separation of high-value targets, contaminants, or other undesirables from water . Indeed, hydrophobic deep eutectic solvents (HDESs) have gained considerable traction as functional solvents sparingly soluble or immiscible with aqueous phases, − allowing for the extraction of fatty acids, , transition-metal ions, pesticides, per- and polyfluoroalkyl substances (PFASs), and radioisotopes (such as 99 m TcO 4 – ) from water . Recent studies have also showcased the efficacy of HDESs as viable extractants for eliminating nanoplastics from water.…”

Section: Introductionmentioning

confidence: 99%

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Nanoplastics Extraction from Water by Hydrophobic Deep Eutectic Solvents

Ishtaweera,

Ray,

Filley

et al. 2024

ACS Appl. Eng. Mater.

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Nanoplastics pollution, a growing environmental threat, adversely affects ecosystems and human health. The challenge in extracting and detecting nanoplastics from environmental matrices lies in their minuscule sizes, varied shapes, and low concentration. We demonstrate an efficient approach employing hydrophobic deep eutectic solvents (HDESs) for the liquid/liquid extraction of polystyrene (PS) beads (nominally sized 0.1, 0.2, 0.3, 0.5, and 1.0 μm), a stand-in for nanoplastics, from both fresh and saline water. Of ten different HDES systems evaluated, those described by 1:2 molar ratios of tetrabutylammonium bromide ([N 4444 ]-Br):decanoic acid or tetraoctylammonium bromide ([N 8888 ]Br):decanoic acid as well as 1:1 thymol:menthol showed exceptional efficiency, achieving nearly complete removal (a mean extraction efficiency of 98.4%) of nanoplastics in a single pass across a range of nanoplastic sizes from 100 to 1000 nm. The HDES comprising 1:2 [N 4444 ]Br:decanoic acid exhibits a high extraction capacity, effectively capturing at least 17.2 wt % of PS. Crucially, the extractive fluids comprise benign components, and the hydrophobicity of these HDESs helps to prevent water phase contamination, showcasing their potential as a sustainable solution to the nanoplastics problem.

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Section: Introductionmentioning

confidence: 99%

“…) 22 from water. 23 Recent studies have also showcased the efficacy of HDESs as viable extractants for eliminating nanoplastics from water. However, a comprehensive exploration into the influence of HDES chemistry and nanoplastic size remains lacking, alongside a dearth of investigation into microplastic (≥1 μm) extraction.…”

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confidence: 99%