溶媒抽出系における界面析出現象とその反射分光法による解析に関する研究(博士論文要録)

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Interfacial adsorption-precipitation phenomena in the solvent extraction systems were investigated for developing a no-precipitation process in hydrometallurgy, and a direct spectroscopic approach for interfacial adsorbates. This paper first addresses the metal-carboxylate extraction system, which typically shows these phenomena. A selection guide for a no-precipitation process was proposed based on the interfacial reaction mechanism. Next, the utility of partial reflection spectrometry was investigated using a J-aggregate of protonated tetraphenylporphyrin adsorbed at the inert organic solvent-aqueous sulfuric acid interface and some home-made optical devices. External reflection (ER) spectrometry was effective to distinguish interfacial Gibbs adsorbates from lipophilic solutes in the organic phase, and to discriminate the adsorption-state change from monolayer to multilayer. The saturated interfacial density of protonated species in the dodecane-4 M H_2SO_4 system was 1.2×10^<-10> mol cm^<-2>, which yielded a tilt angle of 47° of the pyrrole ring plane from the interface normal. Positive and negative bands were observed in the p-polarized spectra of ER (p-ER) and partial internal reflection (p-PIR) with the same band location, but with reversed sign to each other. These results suggest that the surface selection rule of p-PIR spectrometry has a reversal rule of p-ER, and PIR can also be used to analyze the molecular orientation.
社団法人日本分析化学会の論文
2005-05-05

溶媒抽出系における界面析出現象とその反射分光法による解析に関する研究(博士論文要録)

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