The Synergistic Effect of Organophosphorus and Dithiocarbamate Ligands on Metal Extraction in Supercritical CO2

Bulletin of the Korean chemical society

Hakwon Kim¹  Hongdoo Kim¹  Doohyun Yang¹  Kwangheon Park¹  Moonsung Koh¹ 

关键词: Supercritical;    Carbon dioxide;    Metal extraction;    Synergistic effect;    Amine;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex-272) and sodium diethyl- dithiocarbamate (NaDDC) ligands were used to extract of metal ions (Cd2+, Co2+, Cu2+, Pb2+, Zn2+) in supercritical CO2. Experiments showed a strong synergistic effect and better extraction efficiency if the two ligands were used together. In-situ UV-visible observation indicates that NaDDC in the water/supercritical CO2 started to decompose slowly. The synergistic effect seems to come from the deprotonation of the organophosphorus ligand by amines from the decomposed NaDDC. The enhancing role of amines was confirmed using the mixture of Cyanex-272 and diethylamine(DEA) in the metal extraction.

【 授权许可】

Unknown