Choline chloride – Urea deep eutectic solvent an efficient media for the preparation of metal nanoparticles

Balaji, Ramachandran; Ilangeswaran, D.

doi:10.1016/j.jics.2022.100446

Cited by 12 publications

(6 citation statements)

References 22 publications

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“…Due to the uses of gold nanoparticles in multiple fields, i.e., biological, chemical, medical, agricultural, etc. [ 34 , 35 , 36 , 37 , 38 ], it was of interest to consider gold recovery as a type of nanomaterial [ 39 ]; several methods were proposed [ 34 , 36 , 37 ], and one was the use of a reducing agent, such as sodium borohydride [ 40 ]. In the present work, under very gentle (50 min −1 ) stirring, 0.1 g of sodium borohydride was added to a thyocianate strip solution containing 5.1 × 10 −4 M gold.…”

Section: Resultsmentioning

confidence: 99%

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

Robla

2023

IJMS

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Solvent extraction of gold(III) from HCl media using pseudo-protic ionic liquids (PPILs) dissolved in toluene as the extractant phase is investigated. Three PPILs are generated from the reaction of commercially available amines and 1 M HCl solution and named as pri-NH2H+Cl- (derived from the primary amine Primene 81R), sec-NHH+Cl− (derived from the secondary amine Amberlite LA2) and ter-NH+Cl− (derived from the tertiary amine Hostarex A327). In the above structures, -NH2H+Cl−, -NHH+Cl− and -NH+Cl− represented the active groups (anion exchangers) of the respective PPIL. In the case of gold(III) extraction, the experimental variables investigated included the equilibration time (2.5–30 min), temperature (20–60 °C), HCl concentrations (1–10 M) in the aqueous phase, gold(III) concentration (0.005–0.05 g/L) in this same phase, and PPILs concentrations in the organic phase. From the experimental data, and using the Specific Interaction Theory, the interaction coefficients (ε) for the pair AuCl4−, H+ are estimated for the systems involving the three PPILs. Gold(III) is recovered from the metal-loaded organic phases using sodium thiocyanate solutions, and from these, gold is finally recovered by the precipitation of zero-valent gold (ZVG) nanoparticles.

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Section: Resultsmentioning

confidence: 99%

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

Robla

2023

IJMS

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“…Importantly, the use of a reducing agent made it possible to limit the use of high temperatures, as metal oxide nanoparticles were obtained at temperatures as low as 50 °C. However, it was necessary to extend the reaction time to 2 days [ 93 ].…”

Section: Natural Deep Eutectic Solvents Applications In Nanotechnologymentioning

confidence: 99%

Natural Deep Eutectic Solvents in the Synthesis of Inorganic Nanoparticles

Długosz

2023

Materials

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Natural deep eutectic solvents (NDESs), as a new type of green solvent, are used in many fields, including industry in extraction processes, medicine, pharmaceuticals, metallurgy, electrodeposition, separations, gas capture, biocatalysis and nanotechnology. Mainly due to their properties, such as simple preparation, environmental friendliness, biocompatibility and multifunctionality, they are being used in various fields of industry. This review aims to provide insight into the applications of natural deep eutectic solvents, specifically in nanotechnology processes. It focuses on the description of NDES and how their physicochemical properties are used to obtain functional nanomaterials, including metals, metal oxides and salts. It highlights how the use of NDESs to obtain a wide range of inorganic nanoparticles enables the elimination of disadvantages of traditional methods of obtaining them, including reducing energy consumption and functionalising nanoparticles in situ. In conclusion, recent advances and future directions in the development and applications of NDESs in nanotechnology are discussed with the aim of identifying unexplained scientific questions that can be investigated in the future.

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“…4,5 Components used in DES preparation are usually non-toxic, biodegradable, cheap and easily available, [6][7][8] while DESs are characterized by low vapour pressure, low-flammability, good electrical and thermal conductivity with great solubility potential for both organic and inorganic compounds. 9 Nowadays, DESs often replace volatile organic solvents in many processes as they have been extensively used in organic and inorganic synthesis, 7,10,11 extractions, [12][13][14] metal processing, 15 lignin fractionization, 16 pre-treatment of industrial food waste, 17,18 and medicine. 19 One of the DESs' distinguished advantages is the possibility to adjust their physical and chemical properties for different specific purposes.…”

Section: Introductionmentioning

confidence: 99%

Design, preparation and characterization of 7-hydroxy-4-methylcoumarin-based deep eutectic solvents

Kovač,

Molnar,

Jednačak

et al. 2023

New J. Chem.

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Choline chloride – Urea deep eutectic solvent an efficient media for the preparation of metal nanoparticles

Cited by 12 publications

References 22 publications

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

Natural Deep Eutectic Solvents in the Synthesis of Inorganic Nanoparticles

Design, preparation and characterization of 7-hydroxy-4-methylcoumarin-based deep eutectic solvents

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