%0 Journal Article
%T Extraction of Co2+ and Cd2+ from Wastewater Using Hydrophobic Ionic Liquids as Solvents<br>疏水性离子液体为溶剂对Co2+和Cd2+废水的萃取性能
%A LI Chang-ping
%A XIN Bao-ping
%A XU Wen-guo
%A ZHU Qing-rong
%A LU Shi-xiang
%A <br>李长平
%A 辛宝平
%A 徐文国
%A 朱庆荣
%A 卢士香
%J 过程工程学报
%D 2007
%I 
%X Extraction of Co2+ and Cd2+ into hydrophobic ionic liquids of Bmim]PF6, Hmim]PF6 and Omim]PF6 is investigated for examining their removal from wastewater. The results indicate that the extraction rates of both Co2+ and Cd2+ are very low without chelator. However, the extraction rates are greatly enhanced from 2.06% to 96.37% for Co2+ and 1.82% to 93.68% for Cd2+ after the addition of chelator. The addition of different chelators also has a certain impact on the removal rates of heavy metal ions. The longer carbon bond the ionic liquids have, the better the extraction is. Similar to traditional solvent n-butanol, pH has a great impact on the removal rates of Co2+ and Cd2+. When pH<2, the extraction rates of Co2+ and Cd2+ are close to zero. While for pH>6, the extraction rates are above 90%. The pH swing effect is used to strip the heavy metal ions from ionic liquids, and the reuse of ionic liquids is realized.
%K ionic liquids
%K extraction
%K Co2+
%K Cd2+
%K wastewater<br>离子液体
%K 萃取
%K Co2
%K Cd2
%K 废水
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=559E3033CE0B1EA865E71DA8E5CA3382&yid=A732AF04DDA03BB3&vid=DF92D298D3FF1E6E&iid=E158A972A605785F&sid=8B1FE194AD66DC3D&eid=DA280A426E11FC95&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=0&reference_num=28