摘要
在无任何添加剂的情况下,以2-甲基-8-羟基喹啉为螯合剂,考察了时间(10～90 min),温度(313～343K),压力(10～25 MPa),螯合物与金属的摩尔比(50︰1～200︰1)等因素对8种金属离子(Cu2+,CO2+,Ni2+,Fe3+,Pb2+,Cd2+,Mn2+,Zn2+)萃取效率的影响.结果表明,螯合物对Cu2+萃取效率最高,在最佳条件下(323 K,30 min,25 MPa,螯合物与金属离子的摩尔比为200︰1)达88.23%.而在同一萃取体系中,8种金属离子的萃取常数(Kex)随着萃取效率的增加而增加.
Abstract This paper studied the extraction efficiencies of 8 metal ions （ Cu^2＋ , CO^2＋ , Ni^2 ＋, Fe^3＋ , Pb^2＋ , Cd^2＋ , Mn^2＋ and Zn^2 ＋ ） with 2-Methyl-8-hydroxy-quinoline as chelating ligand in supercritical carbon dioxide （ sc-CO2 ） without any other additives. The effects of time （10 - 90 min）,temperature （313- 343 K）,pressure （10 -25 MPa）,and molar ratio of ligand to metal （50 ： 1 - 200 ： 1 ） on the extraction efficiency of metal ions were systematically investigated. The results showed that the best extraction efficiency was 88.23% for Cu^2＋ , obtained in the optimized condition of 30 min, 323 K,25 MPa, ligand to metal ratio of 200：1. And the extraction constants （Kox） of the 8 metal ions increased with the increase of the extraction efficiency in the same extraction system.
出处
《中南民族大学学报（自然科学版）》
CAS
2012年第4期19-22,共4页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
National Science Natural Foundation of China(No.20607031)
the Beijing National Laboratory for Molecular Sciences(BNLMS)for the financial support~~
