N,N-bis-(2-benzimidazolylmethyl)L-methionine: An efficient Ag(I) extractant

Saha, Raja; Guha, Subarna; Sahana, Animesh

doi:10.1134/s1061934813050146

Cited by 2 publications

(2 citation statements)

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“…18,19 Extractants containing at least one of P-, N-, or S-donors have been reported to be selective for the extraction of Ag + from aqueous solutions. 16,[20][21][22] The selectivity of these donors towards Ag + is consistent with the hard soft acid base (HSAB) principle. 23 Similar selectivity has been reported by other authors, for example, Bray and coworkers 14 observed that the ligand -1,3,5-tris((pyridin-4ylthio)methyl)benzene bearing S-and N-donors was the most efficient and selective for Ag + of all three tripodal ligands prepared.…”

Section: Introductionsupporting

confidence: 75%

“…Common techniques employed for silver extraction include chemical precipitation, 6,7 membrane filtration, 8 ion exchange, 9 electrochemical treatment, 10,11 solid phase extraction/adsorption, 12,13 and liquid-liquid extraction. [14][15][16][17] Liquid-liquid extraction has found wide application due to the ability of the extractants to form stable complexes with the silver ion, 18 resulting in efficient extraction and ease of operation. 18,19 Extractants containing at least one of P-, N-, or S-donors have been reported to be selective for the extraction of Ag + from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Binding Studies of a Novel Highly Selective Ag(I) Ligand

Aderibigbe¹,

Clark²

2020

Preprint

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Ligands bearing S-and N-donors are an important class of extractants with demonstrated efficiency and selectivity for Ag + extraction over metals with similar chemistries. However, the synthesis of some of these ligands can be complicated and low yielding. Here, we report the synthesis of a novel ligand -N-(2-((4vinylbenzyl)thio)ethyl)acetamide, over two simple steps and in a good yield. The extractant was observed to demonstrate excellent selectivity for Ag + , extracting only Ag + from an aqueous solution also containing Cu 2+ and Pb 2+ .Moderate extraction efficiencies of 36 % for Ag + and 0% each for Cu 2+ and Pb 2+ were observed. From mass spectrometry and proton NMR titration data, the extractant was found to form both the 1:1 and 1:2 (Ag + :ligand) complexes with Ag + indicating that ligand forms bent linear and tetrahedral coordination complexes with Ag + . Overall, the results indicate that the novel amide-based ligand is highly selective for Ag + removal from aqueous solutions containing Cu 2+ and Pb 2+ . These results indicate the ligand could be easily synthesized and applied for selective silver recovery from low grade ores.

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