(中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083)
摘 要: 為了研究銅的萃取過程，通過構(gòu)建互不相溶微孔界面電化學(xué)方法，研究Cu2+在水/1,2-二氯乙烷界面上與LIX84I的配位轉(zhuǎn)移過程，獲得Cu2+與LIX84的擴(kuò)散動力學(xué)參數(shù)和界面轉(zhuǎn)移機(jī)理。結(jié)果表明：當(dāng)LIX84配體濃度過量時(shí)，萃取過程中Cu2+從水相線性擴(kuò)散至界面的過程為控制步驟，并與LIX84I在界面發(fā)生配位反應(yīng)后，銅配合物以球形擴(kuò)散遷移至有機(jī)相中；當(dāng)Cu2+離子過量時(shí)，LIX84I從有機(jī)相球形擴(kuò)散至兩相界面與Cu2+配位后，銅配合物也以球形擴(kuò)散遷移至有機(jī)相中。Cu2+與LIX84I的萃取過程在兩相界面進(jìn)行，符合界面絡(luò)合轉(zhuǎn)移和界面離解轉(zhuǎn)移的擴(kuò)散機(jī)理。
關(guān)鍵字: 液/液界面；銅萃取；離子轉(zhuǎn)移；電化學(xué)
（School of Chemical and Chemistry Engineering, Central South University, Changsha 410083, China）
Abstract:In order to study the copper extraction process, based on the electrochemical methods for ion transfer at micro-oil/water interface, the transfer process of Cu2+ assisted by LIX84I at the water/1, 2-dichloroethane interface was investigated. The dynamics parameters of the extraction process and the transfer mechanism of copper(II) were obtained. The results indicate that, when the LIX84I is excess, Cu2+ transfers from aqueous phase to oil/water interface and complexes with LIX84I controlled by a linear diffusion, whereas, the transfer process of LIX84I from the organic phase to oil/water interface and complex with Cu2+ controlled by spherical diffusion when Cu2+ is greatly excess. In both cases, the Cu2+ complexes transfer to the organic phase with a spherical diffusion. The Cu2+ complexes form at interface with an interface complexation transfer and interface dissociative transfer mechanism.
Key words: liquid/liquid interface ; copper extraction; ion transfer; electrochemistry
