论文部分内容阅读
用上升液滴法测定二(2-乙基已基)磷酸(HDEHP)从硫酸盐介质中萃取Co~(2+) 的速率.研究体系中加入不同表面活性剂所引起萃取速率的不同改变:三辛基氧化膦(TOPO)因与HDEHP形成可萃取的Co~(2+)活性分子缔合物,降低了萃取过程活化能而使反应加速;十二烷基磺酸钠(SDS)和十六烷基三甲基溴化按(CTMAB)因占据发生萃取反应的界面区,减小了HDEHP与Co~(2+)反应的机会而使反应减速;SDS还因其在界面形成较强的负电场(层),造成 Co~(2+)的附加势能而使萃取速率有更大幅度的降低.
The rate of extraction of Co ~ (2+) from the sulfate medium was determined by the ascending drop method, and the different extraction rates of different surfactants were investigated: Trioctylphosphine oxide (TOPO) accelerates the reaction due to the formation of an extractable Co 2+ -containing complex with HDEHP, which reduces the activation energy of the extraction process. Sodium dodecyl sulfate (SDS) Hexadecyltrimethylphosphonium bromide (CTMAB) reduces the chance of reaction between HDEHP and Co ~ (2+) by occupying the interfacial region where extraction reaction takes place. SDS also forms a stronger Negative electric field (layer), resulting in Co ~ (2+) additional potential energy extraction rate has a more significant decrease.