Voltammetric studies of nitrobenzene reduction on Cu, glassy carbon (GC) and Pb electrodes were carried out with a viewto ascertaLi the choice of cathode material for p-aminophenol synthesis. Lead was found to give irreproducible responsesdue to some electrochemical mixed potential processes. However, on Cu and GC electrodes, the electroreduction was foundto stop at the four electron stage in the first peak potential region which indeed is the condition required for phenylhydroxylamineformation. This conclusion was drawn based on voltammetric peak current calculations as well as the comparativevoltammetric studies of nitrobenzene and p- nitrophenol which is known to follow a 6 electron path. Comparing the voltammetriccurves on Cu and GC for nitrobenzene in alcoholic Hz SO4 medium, it is noticed that the hydrogen evolution processstarts at much more positive potentials on Cu as compared to GC. Since further reduction of phenyl hydroxylamine to theaniline along with Hz evolution would also occur on Cu, it is concluded that carbon electrode would be a better choice forp-aminophenol synthesis
4-Nitrophenol (4-NP) is a very significant compound of NP group and considered as an important hazardous and toxic pollutant. Mostly they are used extensively in chemical industries for the production of different kinds of pesticides, pharmaceutical and synthetic dyes . 4-NP can damage the central nervous system, liver, kidney and blood of animals and humans. Therefore, removal of 4-NP is essential to protect the human being. The easiest way to remove 4-NP from the environment is the reduction of 4-NP to 4-aminophenol (4-Amp). On the other hand, the reduced product 4-aminophenol is very useful in a wealth of applications that include analgesic and antipyretic drugs, photographic developer, corrosion inhibitor, anticorrosion lubricant, and so on . In this context, mesoporous compounds have an important role in photochemical reactions for removal of such type of pollutants. Mesoporous titanium dioxide (TiO) has continued to be highly efficient in photocatalytic applications, because of its high surface area and porous frameworks . In the past decade, there have been few reports about mesoporous transition-metal oxides .
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