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Cathodic Voltammetry of Nitrobenzene at Titanium in Micellar Solution

机译:胶束溶液中钛上硝基苯的阴极伏安法

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The present study relates to electro-reduction of nitrobenzene in the presence of miceller aqueous solution of sodium dodecyl sulphate at titanium cathode, using cyclic voltammetric and titanium etching methods in a three-electrode system. Nitrobenzene gives single reduction peak (Ia) corresponding to the irreversible electrochemical reduction. However, at higher concentrations and lower sweep rates single peak splits into two cathodic peaks. These peaks correspond to reaction mechanisms, involving four-electron over-all change; first step, with one-electron transfer to form anion radical (peak I) similar to electron transfer observed in aqueous micellar media. While the second step involves protonation of anion radical followed by a three electron-addition (peak II) leading to the formation of phenylhydroxylamine. In the presence of SDS nitrobenzene solubilizes and reduces efficiently even at lower concentration; while in the absence of SDS reduction peak appears at relatively higher concentrations of nitrobenzene. This work targets the utility of titanium as cathode.
机译:本研究涉及在三电极系统中使用循环伏安法和钛蚀刻方法,在钛阴极上存在十二烷基硫酸钠胶束水溶液的情况下,对硝基苯进行电还原。硝基苯给出一个单一的还原峰(Ia),对应于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,单个峰会分裂为两个阴极峰。这些峰对应于反应机​​理,涉及四电子整体变化。第一步,通过单电子转移形成阴离子自由基(峰I),类似于在水性胶束介质中观察到的电子转移。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。在存在SDS的情况下,硝基苯即使在较低的浓度下也能溶解并有效地还原。而在没有SDS的情况下,在相对较高的硝基苯浓度下出现还原峰。这项工作的目标是将钛用作阴极。

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