二—(2—乙基己基)二硫代磷酸和二—(2—乙基己基)磷酸萃取镉的性能和成键情况的研究

The Study of Cd (Ⅱ) Extraction with Di-2-EthylhExylphosphorIc Acid (D_2 EHPA) and Di-2-Ethylhexyldithiophoric Acid (D_2 EDTPA)

本文报告了二—(2—乙基己基)二硫代磷酸(D_2EHDTPA)在硫酸和盐酸体系中萃取镉的性能,探讨了反萃条件,实验确定了萃合物的组成。以红外光谱和核磁共振谱讨论了苯合物的成键情况。对比D_2EHDTPA和D_2EHPA(二—(2—乙基己基)磷酸)对镉的萃取性能,通过EHM O计算二者与镉形成萃合物的成键参数,说明了两种萃取剂对镉萃取能力异同的原因,得到了与SHAB原理一致的结果。D_2EHPA和D_2EHDTPA是两种结构相似的含磷萃取剂,本文从理论和实验相结合两个方面来比较这两种萃取剂萃取Cd^(2+)的性能的差别,该二种萃取剂对许多金属离子的一般苯取性能曾有过报告,但国内尚未见D_2EHDTPA对镉的萃取性能的研究报告。该萃取剂与镉的成键情况及理论计算研究未见过报告。本文以萃取实验和量化计算相配合的研究方法,说明了两种萃取剂与镉形成萃合物的能力。同时结合SHAB规则进一步讨论了两种萃取剂与Cd(Ⅱ)的键合能力。

The extraction and strip of Cd (Ⅱ)from sulfuric and hydrochloric acid solution with Di-2-ethylhexylphosphoric acid (D_2EHPA ) and Di-2-ethylhexyldithiophosphoric acid (D_2EHDTPA) has been studied.The composition of extracted complex has been determined by methods of saturation and molecular ratio. The bounding of extracted species has been discussed on the basis of its IR and NMR.It has been explained satisfactorily that the extraction capacities of Cd (Ⅱ) ion in the two extractants are different by quantum chemical EHMO Method.