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将含有氧化还原探针的硝基苯溶液滴到边平面热解石墨(EPPG)电极上,然后将该电极插入到电解质水溶液中,从而使硝基苯、石墨表面以及水溶液形成一个三相接界线,即形成了EPPG三相电极。利用循环伏安法对EPPG三相电极法的原理进行了研究,得到了比文献报道更理想的液/液界面离子转移热力学数据。本研究还观察到铬(Ⅵ)离子在水相/硝基苯相界面上的转移反应,并测定了铬(Ⅵ)的离子转移热力学数据;同时还分别利用方波伏安法和傅里叶变换-方波伏安法结合“准可逆最大”现象对铬(Ⅵ)在水相/硝基苯相界面上的离子转移动力学进行了比较研究。
The nitrobenzene solution containing the redox probe is dropped onto the edge planar pyrolytic graphite (EPPG) electrode, which is then inserted into the aqueous electrolyte so that the nitrobenzene, the graphite surface, and the aqueous solution form a three-phase junction , That is formed EPPG three-phase electrode. The principle of EPPG three-phase electrode method was studied by cyclic voltammetry. The thermodynamic data of the ion-transfer at the liquid / liquid interface was obtained better than reported in the literature. In this study, we also observed the transfer reaction of chromium (VI) ions at the water / nitrobenzene interface and the thermodynamic data of the ion transfer of chromium (Ⅵ). At the same time, The kinetics of ion transfer kinetics of Cr (Ⅵ) at the interface of water phase and nitrobenzene phase was investigated by the transformation-square wave voltammetry combined with the phenomenon of “quasi-reversible maximum”.