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A triamide ligand (NTAamide, n-oct) was successfully synthesized through the amidation reaction of 2,2′,2′′-nitrilotriacetic acid (NTA) and n-octylamine, validated by comparing 1H NMR with those calculated using DFT. Various experiments were conducted under varying concentrations of Ru, HNO3, or NaNO3, with n-dodecane as the modifier, to evaluate the behavior and capacity of NTAamide(n-oct) in extracting Ru. It turned out that NTAamide(n-oct) exhibits a significant dependence on acidity for its extraction potential, with the highest extraction ratio observed at [HNO3] = 1.0 M. Moreover, kinetic experiments revealed that 48 h are required for the extraction reaction to reach equilibrium. The addition of NaNO3 serves as a supplier of NO3− legend and enhances the extraction distribution coefficient by adjusting the value of x in complex [Ru(NO)(NO3)x(H2O)y(OH)z]3−x−z, which is a primary form of Ru(III) in nitric acid solutions. Furthermore, extraction experiments at different concentrations of NTAamide(n-oct) were carried out to illustrate its Ru-extracting behavior. Results acquired from the loading test indicate that the extraction capacities of this ligand are approximately 6.24 ± 0.27 g/mol, 8.25 ± 0.23 g/mol, and 6.36 ± 0.22 g/mol under 0.5 M, 1.0 M, and 3.0 M HNO3, respectively.

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Study on Extraction of Ruthenium(III) from Nitric Acid Using a Triamide Ligand: NTAamide(n-oct)

  • 会议论文

  • 发表日期：

    2026年

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  • Jianing Xing,
  • Luyu Zhang,
  • Hanyue Ma,
  • Hao Wu,
  • Yan Wu

摘要

A triamide ligand (NTAamide, n-oct) was successfully synthesized through the amidation reaction of 2,2′,2′′-nitrilotriacetic acid (NTA) and n-octylamine, validated by comparing 1H NMR with those calculated using DFT. Various experiments were conducted under varying concentrations of Ru, HNO3, or NaNO3, with n-dodecane as the modifier, to evaluate the behavior and capacity of NTAamide(n-oct) in extracting Ru. It turned out that NTAamide(n-oct) exhibits a significant dependence on acidity for its extraction potential, with the highest extraction ratio observed at [HNO3] = 1.0 M. Moreover, kinetic experiments revealed that 48 h are required for the extraction reaction to reach equilibrium. The addition of NaNO3 serves as a supplier of NO3− legend and enhances the extraction distribution coefficient by adjusting the value of x in complex [Ru(NO)(NO3)x(H2O)y(OH)z]3−x−z, which is a primary form of Ru(III) in nitric acid solutions. Furthermore, extraction experiments at different concentrations of NTAamide(n-oct) were carried out to illustrate its Ru-extracting behavior. Results acquired from the loading test indicate that the extraction capacities of this ligand are approximately 6.24 ± 0.27 g/mol, 8.25 ± 0.23 g/mol, and 6.36 ± 0.22 g/mol under 0.5 M, 1.0 M, and 3.0 M HNO3, respectively.