• 关键词：中空纤维  膜萃取  铈  二(2-乙基己基)磷酸

• 基金项目：

• 夏晔
• 复旦大学环境科学与工程系,上海 200433

• 杜慧芳
• 复旦大学环境科学与工程系,上海 200433

• 许丽红
• 复旦大学环境科学与工程系,上海 200433

• 杨竹仙
• 复旦大学环境科学与工程系,上海 200433

• 周祖铭
• 复旦大学环境科学与工程系,上海 200433

• 摘要：研究了在中空纤维膜萃取器中二(2-乙基己基)磷酸(HDEHP)萃取铈(Ⅲ)的动力学,通过测定水相和有机相流速,水相铈(Ⅲ)浓度、酸度和有机相HDEHP浓度,得出了萃取速率的规律.实验结果表明,在本实验条件下,萃取速率为界面化学反应控制,Ce³⁺与第一个HDEHP二聚体离子HA₂^-的配位反应是萃取速率的控制步骤.

• Abstract：The kinetics of solvent extraction of Ce(Ⅲ) with di (2-ethylhexyl) phosphoric acid (HDEHP) using a microporous hydrophobic hollow fiber membrane extractor has been investigated. By examining the effects of flow velocities of aqueous and organic phase, Ce(Ⅲ)and hydrogen ion concentrations in aqueous phase, HDEHP concentration in organic phase and temperature on extraction rate of Ce(Ⅲ), the regularity of extraction rate was obtained. The experimental results indicated that the extraction rate is controlled by chemical reaction on interface under the experimental conditions and the reaction between Ce(Ⅲ) ion and the first dimeric polymer ion of HDEHP HA₂^- might be the rate-controlling step.

• Key words：hollow fiber  membrane extraction  cerium  HDEHP

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