3 resultados para cell location
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
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Resumo:
(Dicranopteris dichotoma Bernh.)(Cucumis sativus Linn) 10.5 mmolL-1 LaCl3PS II12 mmolL-1 LaCl3LaCl3PS II 2>>>>>>> 3510PS II 4 534.9PS II252.9PS I16.8PS IIPS IIPS II67.0 646.3PS II23.8PS I60.4PS IPS I60.0
Resumo:
The yttrium(III) extraction kinetics and mechanism with bis-(2,4,4-trimethyl-pentyl) phosphinic acid (Cyanex 272, HA) dissolved in heptane have been investigated by constant interfacial cell with laminar flow. The data has been analyzed in terms of pseudo-first order constants. Studies on the effects of stirring rate, temperature, acidity in aqueous phase, and extractant concentration on the extraction rate show that the extraction regime is dependent on the extraction conditions. The plot of interfacial area on the rate has shown a linear relationship. This fact together with the strong surface activity of Cyanex 272 at heptane-water interfaces has made the interface the most probable location for the chemical reactions. The forward, reverse rate equations and extraction rate constant for the yttrium extraction with Cyanex 272 have been obtained under the experimental conditions. The rate-determining step has been also predicted from interfacial reaction models. The predictions have been found to be in good agreement with the rate equations obtained from experimental data, confirming the basic assumption that the chemical reaction is located at the liquid-liquid interface.