摘要
为实现从废汽车尾气净化催化剂的浸出液中高效分离钯,合成一种新化合物N-甲基-N-异丙基硫代辛酰胺(TA-813)。通过FT-IR、1H NMR、ESI-MS和元素分析进行表征,研究TA-813对钯的萃取和反萃行为。通过萃取−反萃循环试验评估TA-813的循环使用性能,并用TA-813从废汽车尾气净化催化剂的模拟浸出液中选择性萃取分离钯。结果表明:TA-813对钯萃取速度快、效率高、选择性好;2个TA-813分子萃取1个Pd;有机相中负载的钯可被中性和酸性硫脲高效反萃;TA-813循环使用性能好,经过8次萃取−反萃循环,钯的萃取率没有降低。在废汽车尾气净化催化剂的模拟浸出液中,Pd的浓度远低于杂质离子La、Ce、Mg和Al等,即便如此,TA-813仍能实现钯的选择性高效分离。
To seek more efficient extractant for Pd recovery from leaching solution of spent automotive catalysts,a new compound N-methyl-N-isopropyl octanthioamide(TA-813)was synthesized and characterized through FT-IR,1H NMR,ESI-MS and elemental analysis.Its extraction and stripping behaviors for Pd were studied.To evaluate its reusability performance,extraction−stripping cycles were carried out.Finally,TA-813 was applied to separating Pd from simulated leaching solution of spent automotive catalysts.TA-813 shows fast extraction kinetics,high extraction efficiency and specific selectivity for Pd.During extraction two TA-813 molecules coordinate with one Pd.The loaded Pd in the organic phase is efficiently stripped by neutral and acidic thiourea solutions.TA-813 shows no loss in activity after eight extraction−stripping cycles.Even from simulated leaching solution of spent automotive catalysts,in which the concentrations of some purities(La,Ce,Mg,Al)are much higher than that of Pd,Pd is still selectively extracted.
作者
王俊莲
刘璐
徐国栋
王培龙
黄国勇
郁丰善
Jun-lian WANG;Lu LIU;Guo-dong XU;Pei-long WANG;Guo-yong HUANG;Feng-shan YU(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory for High Efficient Mining and Safety of Metal Mines,Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China;Jiangxi Province Han’s Precious Metals Co.,Ltd.,Shangrao 335500,China;State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum-Beijing,Beijing 102249,China)
基金
the National Key Research and Development Program for Young Scientists,China(No.2021YFC2901100).
