Recovery of Pd(II) Ions from Aqueous Solutions Using Activated Carbon Obtained in a Single-Stage Synthesis from Cherry Seeds

Michałek, Jan Jakub; Wojtaszek, Konrad; Małecki, S.; Kornaus, Kamil; Wandor, Szymon; Druciarek, Julia; Fitzner, K.; Wojnicki, Marek

doi:10.3390/c9020046

Cited by 3 publications

(2 citation statements)

References 55 publications

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“…Water molecules bind around inorganic ions, making the arrangement of H 2 O molecules in solution more orderly and structured. This phenomenon is known as kosmotropic behavior . Therefore, when the content of K 2 HPO 4 increases, the spatial molecular structure of the salt-rich solution becomes more compact and structured, thereby correspondingly increasing its incompatibility with the GIL phase.…”

Section: Resultsmentioning

confidence: 99%

“…After the inorganic salt is dissolved in the GIL solution, the inorganic ions compete with the GIL to hydrate H 2 O molecules. Since inorganic ions have a higher affinity for water molecules than GIL, H 2 O molecules initially bound to GIL migrate to bind to inorganic ions, resulting in a decrease in GIL hydration, thus splitting the homogeneous aqueous phase into two aqueous phases . Therefore, the formation of the aqueous two phase is determined by the difference in the affinity of inorganic ions and GIL for water molecules.…”

Section: Resultsmentioning

confidence: 99%

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Green Aqueous Two-Phase Systems Constructed by Guanidinium Ionic Liquid for Efficient Recovery of Gold(I) from Thiosulfate Solution

Ma,

Chen,

Qiu

et al. 2024

ACS Sustainable Chem. Eng.

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Although thiosulfate leaching is a more sustainable alternative to the toxic cyanidation process for gold extraction, recovering Au(I) from pregnant thiosulfate solutions remains a significant challenge. In this study, novel aqueous two-phase systems (ATPSs) were constructed using green guanidinium ionic liquids (GILs) and inorganic salts for recycling gold thiosulfate from weak alkaline solutions. Key parameters including salt type, salt content, GIL content, extraction time, equilibrium pH, and initial Au(I) concentration were extensively explored. The extraction efficiencies of Au(I) reached 95.8% for [C 3 -Gun]Cl, 96.5% for [C 4 -Gun]Cl, and 97.7% for [C 5 -Gun]Cl system under optimal conditions. Spectral analysis and density functional theory calculations reveal that the main mechanism for Au(I) extraction is that Au(S 2 O 3 ) 2 3− anions replace Cl − anions in GILs, which then interact with guanidinium cations through electrostatic force. In addition, KSCN solution can efficiently strip gold thiosulfate with an efficiency of more than 99% and regenerate the GIL-rich phase simultaneously. The results of five extraction/stripping cycles showed that the extraction efficiency of Au(I) decreased slightly from 98.0 to 90.4%, while the stripping percentage decreased slightly from 99.7 to 92.3%, confirming that GIL-ATPS has excellent cycling performance. These results demonstrate that green ATPSs consisting of GILs provide a sustainable and efficient approach to gold recovery from thiosulfate solutions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Green Aqueous Two-Phase Systems Constructed by Guanidinium Ionic Liquid for Efficient Recovery of Gold(I) from Thiosulfate Solution

Ma,

Chen,

Qiu

et al. 2024

ACS Sustainable Chem. Eng.

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Waste for Product—Synthesis and Electrocatalytic Properties of Palladium Nanopyramid Layer Enriched with PtNPs

Luty-Błocho,

Pach,

Kutyła

et al. 2024

Materials

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The presented research is the seed of a vision for the development of a waste-for-product strategy. Following this concept, various synthetic solutions containing low concentrations of platinum group metals were used to model their recovery and to produce catalysts. This is also the first report that shows the method for synthesis of a pyramid-like structure deposited on activated carbon composed of Pd and Pt. This unique structure was obtained from a mixture of highly diluted aqueous solutions containing both metals and chloride ions. The presence of functional groups on the carbon surface and experimental conditions allowed for: the adsorption of metal complexes, their reduction to metal atoms and enabled further hierarchical growth of the metal layer on the carbon surface. During experiments, spherical palladium and platinum nanoparticles were obtained. The addition of chloride ions to the solution promoted the hierarchical growth and formation of palladium nanopyramids, which were enriched with platinum nanoparticles. The obtained materials were characterized using UV–Vis, Raman, IR spectroscopy, TGA, SEM/EDS, and XRD techniques. Moreover, Pd@ROY, Pt@ROY, and Pd-Pt@ROY were tested as possible electrocatalysts for hydrogen evolution reactions.

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Ni-Doped Activated Carbon from Invasive Plants as a Potential Catalyst

Dudek,

Wojtaszek,

Żabiński

2024

Metals

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In this study we synthesized and characterized Ni/AC (Activated Carbon) systems. AC was obtained through pyrolysis of golden rod’s dried biomass. Ni nanoparticles were deposited on AC’s surface using a wet impregnation method from a nickel nitrate solution. SEM, MP-AES and DSC-TGA techniques were used for surficial and structural characterization, while ash content was made to check mineral ingredients input. The DSC-TGA study revealed that all carbons show good thermal stability up to 900 °C, which is far above operating temperatures in the methanation process. For all three carbons the BET isotherms were made as well. They show that in most cases the carbon’s surface is well developed and can adsorb decent amounts of metal. MP-AES helped to evaluate the efficiency of the impregnation process, which reached 76 mg of Ni per 1 g of carbon. The SEM-EDS study showed good distribution of Ni nanoparticles across AC’s surface. We also made a comparison of our systems to similar materials from other works.

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Recovery of Pd(II) Ions from Aqueous Solutions Using Activated Carbon Obtained in a Single-Stage Synthesis from Cherry Seeds

Cited by 3 publications

References 55 publications

Green Aqueous Two-Phase Systems Constructed by Guanidinium Ionic Liquid for Efficient Recovery of Gold(I) from Thiosulfate Solution

Green Aqueous Two-Phase Systems Constructed by Guanidinium Ionic Liquid for Efficient Recovery of Gold(I) from Thiosulfate Solution

Waste for Product—Synthesis and Electrocatalytic Properties of Palladium Nanopyramid Layer Enriched with PtNPs

Ni-Doped Activated Carbon from Invasive Plants as a Potential Catalyst

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