Redox fusion of metal particles using deep eutectic solvents

Abbott, Andrew P.; Cihangir, Salih; Ryder, Karl S.

doi:10.1039/c8cc00360b

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…DES is a fluid, usually composed of two or three inexpensive and safe components formed by hydrogen bonding of eutectic mixtures with melting points lower than that of each individual component . The physical and chemical properties of DES are very similar to those of ionic liquids, , which have a simple preparation, low cost, low toxicity, good solubility, and non-volatility. − Recently, researchers have found that DES has excellent solubility for metal oxides even without a reducing agent or an extractant, which makes the research of DES in the field of spent LIB recycling more and more enthusiastic. − Peeters et al prepared a DES that consisted of choline chloride (ChCl) and citric acid containing 35 wt % of water as an extraction agent, 98% Co and 93% Li could be extracted from lithium cobalt oxide (LiCoO 2 ) using Cu as the reducing agent . The use of reductants and post-treatment will make the metal extraction process more complex, while DES can optimize the process and be more environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Sustainable and Convenient Recovery of Valuable Metals from Spent Li-Ion Batteries by a One-Pot Extraction Process

Chen

et al. 2021

ACS Sustainable Chem. Eng.

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Spent Li-ion battery (LIB) recovery has become the hot research area due to its surge in quantity and release of heavy metals and toxic substances harmful to the environment. Green and efficient recovery methods are of great significance for the recovery of valuable metals. Herein, an oxalic acid-based deep eutectic solvent (DES) with the weak acidic character and reducibility of oxalic acid was designed for the recovery of valuable metals from spent LIBs via a sustainable and convenient process. Nearly 96.1% of Li and 96.3% of Co can be extracted from lithium cobalt oxide at 120 °C. The DES can extract valuable metals from cathode materials and separate metal ions by itself after extraction without destroying its own structure in a one-pot extraction process. The composition and the structure of DES have been maximum retained and could be intact recycled for another recovery process. After five cycles, the Li and Co extraction efficiencies were maintained above 92.9 and 74.5%, respectively. This work provides a sustainable one-pot recovery process with inexpensive and simple operations for valuable metal recovery from spent LIBs.

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Section: Introductionmentioning

confidence: 99%

Sustainable and Convenient Recovery of Valuable Metals from Spent Li-Ion Batteries by a One-Pot Extraction Process

Chen

et al. 2021

ACS Sustainable Chem. Eng.

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“…Zein Nanofibers were prepared separately in conventional and deep eutectic solvent using (Har-100*12, Matsusada Co., Tokyo, Japan) Electrospinning machine. Zein 25% (w/v) in 80% of Aq-EtOH was stirred for 2 h at 80 °C 21 . The DES was prepared by mixing Choline chloride and Furfuryl alcohol with molar ratio 2:1 and stirred well until a clear transparent solution was obtained.…”

Section: Methodsmentioning

confidence: 99%

Zein nanofibers via deep eutectic solvent electrospinning: tunable morphology with super hydrophilic properties

Khatri

El-Ghazali

et al. 2020

Sci Rep

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The use of organic solvents for the preparation of nanofibers are challenged due to their volatile and hazardous behavior. Recently deep eutectic solvents (DES) are widely recognized as non-volatile and non-hazardous solvents which never been utilized directly for nanofabrication via electrospinning. Here, we present the preparation of Zein nanofibers using deep eutectic solvents (DES-Zein). The DES-Zein nanofibers were produced at an optimized polymer concentration of 45% (w/w) with pH 7.3 and electroconductivity 233 mS cm−1. DES-Zein nanofibers showed aligned to tweed like cedar leaf morphology tuned by varying the spreading angle from 0° to 90°. In contrast to hydrophobic conventional Zein nanofibers, DES-Zein nanofibers showed super hydrophilic character and about 200 nm finer average diameter. The proposed method of preparing Zein nanofibers using DES opens a new door to continuous electrospinning with tunable morphology, having potential to be used for environmental and biomedical applications.

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“…DESs are ion composite solutions formed from a hydrogen key receptor and hydrogen key supplier; they have many advantages, such as low price, easy access, easy synthesis, green and environmentally friendly degradability, non-toxicity, and low volatility [ 16 , 17 ]. DESs have been used in organic synthesis and (biological) catalysis [ 18 ], biochemistry [ 19 ], analytical chemistry [ 20 ], nanomaterials [ 21 ], and extraction processes [ 22 ]. However, there is no report on DESs for extracting polysaccharides from Bletilla striata .…”

Section: Introductionmentioning

confidence: 99%

Study on Process Optimization and Antioxidant Activity of Polysaccharide from Bletilla striata Extracted via Deep Eutectic Solvents

et al. 2023

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Taking the extraction yield of Bletilla striata polysaccharide (BSP) as the index and taking the type of deep eutectic solvents (DESs), extraction time, extraction temperature, DES water content, and solid–liquid ratio as the investigation factors, single-factor and Box–Behnken response surface tests were carried out to optimize the extraction process of BSP. Thus, the antioxidant activity of BSP on DPPH radicals, ABTS radicals and ferric reducing antioxidant power were determined. The results showed that the most suitable deep eutectic solvent was DES-2, namely choline chloride-urea. The optimal extraction conditions for BSP were an extraction time of 47 min, extraction temperature of 78 °C, water content of 35%, and solid–liquid ratio of 1:25. Under this optimized condition, the extraction yield of BSP was able to reach (558.90 ± 8.83) mg/g, and recycling studies indicated the good cycle stability of the DES. Antioxidant results showed that BSP had superior antioxidant activity and had a dose–response relationship with drug concentration. Compared with Bletilla striata polysaccharide obtained via conventional hot water extraction (BSP-W), the extraction yield of BSP obtained through this method (BSP-2) increased by 36.77%, the scavenging activity of DPPH radicals increased by 24.99%, the scavenging activity of ABTS radicals increased by 41.16%, and the ferric reducing antioxidant power increased by 49.19%. Therefore, DESs as new green reagents and BSP extracted with DESs not only had a high yield but also had strong antioxidant activity.

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Redox fusion of metal particles using deep eutectic solvents

Cited by 9 publications

References 17 publications

Sustainable and Convenient Recovery of Valuable Metals from Spent Li-Ion Batteries by a One-Pot Extraction Process

Sustainable and Convenient Recovery of Valuable Metals from Spent Li-Ion Batteries by a One-Pot Extraction Process

Zein nanofibers via deep eutectic solvent electrospinning: tunable morphology with super hydrophilic properties

Study on Process Optimization and Antioxidant Activity of Polysaccharide from Bletilla striata Extracted via Deep Eutectic Solvents

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