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Electro-reduction of Nitrobenzene at Titanium Cathode in SDS Aqueous Micellar Solution

机译：SDS胶束水溶液中钛阴极上硝基苯的电还原

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Electro-catalytic reduction of nitrobenzene has been studied from a number of perspective.~(1-23)However, there are very few known studies so far in literature related to reduction of nitrobenzene at titanium electrode in aqueous media. Previously we have studied the electrochemical reduction of nitrate at titanium electrode.~(24)This work relates to electro-reduction of nitrobenzene at titanium cathode, 0.05 cm~2, in the presence of miceller aqueous solution of sodium dodecyl sulphate, using titanium etching and cyclic voltammetric methods in a three-electrode system. Nitrobenzene gives single reduction peak corresponding to the irreversible electrochemical reduction shown in Fig. 1. However at higher concentrations and lower sweep rates single peak splits into two cathodic peaks at more negative potentials. These peaks correspond to reaction mechanisms as per literature for neutral, acidic and alkaline solutions~(1-16) involving four-electron over-all reduction; consisting of a first step, with one-electron transfer to form anion radical (peak I) same electron transfer observed in aqueous micellar media17'20. While the second step involves protonation of anion radical followed by a three electron-addition (peak II) leading to the formation of phenylhydroxylamine. Furthermore the linear relationship of graph, plotted as square root of sweep rate versus cathodic peak current demonstrates that the process is diffusion controlled.
机译：从多个角度研究了硝基苯的电催化还原。〜（1-23）然而，迄今为止，关于在水性介质中钛电极上硝基苯的还原的文献很少。以前我们已经研究了钛电极上硝酸盐的电化学还原。〜（24）该工作涉及在十二烷基硫酸钠的胶束水溶液存在下，通过钛蚀刻在0.05 cm〜2的钛阴极上对硝基苯进行电还原。三电极系统中的循环伏安法。硝基苯给出一个单一的还原峰，对应于图1所示的不可逆的电化学还原。但是，在较高的浓度和较低的扫描速率下，单个峰在较高的负电势下会分成两个阴极峰。这些峰对应于文献中关于中性，酸性和碱性溶液〜（1-16）的反应机理，涉及四电子整体还原；第一步，由单电子转移形成阴离子自由基（峰I），在胶束介质中观察到相同的电子转移17'20。尽管第二步涉及阴离子自由基的质子化，然后进行三个电子加成反应（峰II），导致形成苯羟胺。此外，图的线性关系绘制为扫描速率与阴极峰值电流的平方根，表明该过程受扩散控制。

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