2-甲基-8-羟基喹啉在超临界CO_2中萃取金属离子研究(英文)  

Metal Ions Extraction with 2-Methyl-8-Hydroxy-Quinoline as Chelating Ligand in Supercritical Carbon Dioxide

作　　者：杨海健[1] 蔡卓福[1] 李欢欢[1] 赵璐[1] 田佳[1] 

机构地区：[1]中南民族大学化学与材料科学学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》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~~

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.

关 键 词：2-甲基-8-羟基喹啉 金属离子 萃取 萃取常数 超临界二氧化碳 

分 类 号：O513[理学—低温物理]