INTERFACIAL ACTIVITY OF HDEHP AND KINETICS OF NICKEL EXTRACTION IN VARIOUS DILUENTS |
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| Authors: | Sun Guo-Xin Cui Yu Sun Si-Xiu Yang Yong-Hui Yang Yan-Zhao |
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| Affiliation: | 1. Department of Applied Chemistry , Shandong Institute of Building Material , Jinan, 250022, P.R.China;2. Department of Chemistry , Shandong University , Jinan, 250100, P.R.China |
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| Abstract: | ABSTRACT The interfacial behavior of HDEHP at various diluents/0.05M (H2,Na2)SO4 interfaces was examined using the Drop Volume Method. Different adsorption isotherms such as the Gibbs and Szyszkowski were found as fits well to the experimental interfacial tension isotherms. The values of surface excess at saturated interface,calculated according to them by using the concentration of individual species (e.g. organic monomeric species),increase in the order: MIBK4 The interfacial activity data were used to discuss the mechanism and kinetics of nickel extraction. It was shown that the interfacial mechanism is very probable and the extraction limiting step is the reaction between HDEHP molecules present near the interface and the intermediate 1:2 complex just as following Ni(H2O) 4A2(int,0) +2H2A2(int,0) =Ni(H2O) 2A2˙2H2A2(int,0) +2H2O(int,0) The investigation of the influence of diluent on the extraction rate supports the mechanism suggested. |
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