Extraction of Cu(II) with dioctyldithiocarbamate and a kinetic study of the extraction using a two-phase microflow system
Extraction of Cu(II) with dioctyldithiocarbamate and a kinetic study of the extraction using a two-phase microflow system
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DOI：
10.15261/serdj.17.209
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发表时间：
2010
影响因子：
0.7
通讯作者：
Kotaro Morita;Takuo Hagiwara;N. Hirayama;H. Imura
中科院分区：
文献类型：
--
作者：
Kotaro Morita;Takuo Hagiwara;N. Hirayama;H. Imura
使用两相微流系统研究了二烷基二硫代氨基甲酸盐萃取 Cu(II) 及其萃取动力学。采用间歇法研究了二辛基二硫代氨基甲酸钾 (Kdodtc) 萃取 Cu(II) 的行为，以确定合成的 Kdodtc 的性质。在酸性条件下，dodtc 的萃取能力远大于二乙基二硫代氨基甲酸酯（dedtc）。另一方面，在 8 - 13 范围内的较高 pH 值下，用 dodtc 萃取 Cu(II) 会随着 pH 值的增加而降低。这种现象归因于胶束和/或乳液的形成，这是由 dodtc 的两亲特性引起的。使用连接至微注射泵和紫外/可见毛细管液相色谱检测器的玻璃微芯片研究了 Cu(II) 的萃取动力学。 dodtc 确定的初始速率常数 ( k app ) 大于 dedtc 确定的初始速率常数 ( k app )。根据 dodtc 浓度与 k app 之间的关系，表明萃取率受液-液界面处 dodtc 复合物的形成控制。
Extraction of Cu(II) with dialkyldithiocarbamates and the extraction kinetics have been studied using a two-phase microflow system. The extraction behavior of Cu(II) with potassium dioctyldithiocarbamate (Kdodtc) was investigated using a batch method to determine the propertes of the synthesized Kdodtc. The extraction ability of dodtc was much greater than that of diethyldithiocarbamate (dedtc) under acid conditions. On the other hand, at higher pH values in the range of 8 - 13, the extraction of Cu(II) with dodtc decreased with increasing pH. This phenomenon was ascribed to the formation of micelles and/or an emulsion, which was caused by the amphiphilic properties of dodtc. The extraction kinetics of Cu(II) was investigated using a glass microchip which was connected to microsyringe pumps and a UV/Vis capillary LC detector. The initial rate constant ( k app ) determined for dodtc was greater than that with dedtc. From the relationship between the dodtc concentration and k app , it was suggested that the extraction rate was governed by the formation of the dodtc complex at the liquid-liquid interface.