Et-Ph-BCTABipy的合成及其对Pd2+的萃取性能

合成了N，N′-二乙基-N，N′-二苯基-［2，2′-联吡啶］-6，6′-二硫代酰胺(Et-Ph-BCTABipy)萃取剂，并利用¹³C NMR和¹H NMR对其进行了表征；研究了相接触时间、萃取剂浓度、水相初始酸度和Pd²⁺浓度等因素对Et-Ph-BCTABipy萃取Pd²⁺性能的影响，利用摩尔比法确定了Et-Ph-BCTABipy与Pd²⁺所形成的配合物组成；同时，在Ln(Ⅲ)与Pd²⁺共存体系中研究了Et-Ph-BCTABipy对Pd²⁺的萃取选择性。结果表明：Et-Ph-BCTABipy在HNO₃体系中对Pd²⁺具有较强的萃取性能和较高的萃取选择性；萃取过程中Et-Ph-BCTABipy与Pd²⁺以1∶2的比例结合，其萃取平衡常数K_ex=3.42×10⁶。

Synthesis of Et-Ph-BCTABipy and Its Extraction Properties for Pd2+

In this work, a phenanthroline based tetradentate neutral sulfur-containing ligand,N,N′-diethyl-N,N′-diphenyl-［2,2′-bipyridine］-6,6′-bis(carbothioamide)(Et-Ph-BCTABipy) was synthesized and characterized by ¹³C NMR and ¹H NMR. The effects of phase contact time, concentration of extractant, and initial concentration of HNO₃ and Pd²⁺ in aqueous phase on the extraction performance of Et-Ph-BCTABipy were studied, and the complex composition of Et-Ph-BCTABipy with Pd²⁺ was determined by molar ratio method. At the same time, the extraction selectivity of Et-Ph-BCTABipy to Pd²⁺ was also studied in the coexistence system of Ln(Ⅲ) and Pd²⁺. The results show that Et-Ph-BCTABipy has strong extraction performance and high extraction selectivity for Pd²⁺ in HNO₃ system. During the extraction process, Et-Ph-BCTABipy combines with Pd²⁺ in a ratio of 1∶2, and its extraction equilibrium coefficient is K_ex=3.42×10⁶.