Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Melnyk, Inna V.; Václavíková, Miroslava; Ivaničová, Lucia; Kaňuchová, Mária; Seisenbaeva, Gulaim A.; Kessler, Vadim G.

doi:10.1016/j.apsusc.2022.155253

Cited by 8 publications

(3 citation statements)

References 54 publications

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“…The amount of adsorbed RE 3+ was plotted versus the residual equilibrium concentration to yield a five‐point isotherm. Langmuir and Freundlich isotherm models were tested using the following Equations (5) and (6), respectively, in Table 2 34 …”

Section: Methodsmentioning

confidence: 99%

“…Langmuir and Freundlich isotherm models were tested using the following Equations ( 5) and ( 6), respectively, in Table 2. 34 In Equation ( 5), qe is the equilibrium adsorption capacity of RE 3+ ion on the hydrogel (mg/g), qm is the maximum adsorption capacity of adsorbate (mg/g), Ce represents the equilibrium concentration (mg/L), and K l is the Langmuir isotherm constant (L/mg). In Equation ( 6), K f is the Freundlich isotherm constant (mg/g).…”

Section: Study Of Adsorption Isothermsmentioning

confidence: 99%

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Shungite/poly(vinyl alcohol) hybrid hydrogels: An efficient adsorption material for rare earth metals in aqueous media

Kyshkarova,

Behunova,

Melnyk

et al. 2023

J of Applied Polymer Sci

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Rare earth elements play a pivotal role in modern technologies, thereby driving an escalating demand for their procurement. To effectively extract these elements from aqueous solutions, it is imperative to explore innovative sorbent materials. In this context, a hydrogel sorbent material was developed by employing poly(vinyl alcohol) (PVA) and shungite—an economical, naturally occurring, easily processable, and sustainable material. This was achieved through the freezing–thawing method, employing sodium borate as a crosslinking agent. The physicochemical characteristics of the hydrogels were determined through scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier‐transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) analysis, Zetasizer analysis, and elemental analysis. The shungite‐incorporated PVA hydrogels displayed notable characteristics, including a substantial swelling capacity of 61% and a specific surface area of 32.8 m2/g. Most significantly, these hydrogels exhibited a remarkable affinity for La3+ ions, with an uptake ratio of 134 mg/g. This was followed by Nd3+, Dy3+, and Er3+ ions, which displayed uptake ratios of 79, 74, and 73 mg/g, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Study Of Adsorption Isothermsmentioning

confidence: 99%

Shungite/poly(vinyl alcohol) hybrid hydrogels: An efficient adsorption material for rare earth metals in aqueous media

Kyshkarova,

Behunova,

Melnyk

et al. 2023

J of Applied Polymer Sci

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“…Considering these various separation technologies, recent published applications of these on gold(III) processing included solvent extraction [ 7 , 8 , 9 , 10 , 11 ], precipitation [ 12 , 13 ], ion exchange [ 14 , 15 , 16 ], adsorption [ 17 , 18 , 19 , 20 , 21 ] and even polymer inclusion membranes [ 22 ].…”

Section: Introductionmentioning

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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Open/Closed Cage Silsesquioxane-based Thioamide-bridged Hybrid Networks with Unexpected Adsorption Abilities and Selectivity for Au (III)

Liu

2023

Chemical Engineering Journal

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Features of the surface layer structure of the magnetosensitive materials functionalized by silica with thiourea groups and their applying for selective Cu(II) and Au(III) ions removal

Cited by 8 publications

References 54 publications

Shungite/poly(vinyl alcohol) hybrid hydrogels: An efficient adsorption material for rare earth metals in aqueous media

Shungite/poly(vinyl alcohol) hybrid hydrogels: An efficient adsorption material for rare earth metals in aqueous media

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

Open/Closed Cage Silsesquioxane-based Thioamide-bridged Hybrid Networks with Unexpected Adsorption Abilities and Selectivity for Au (III)

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