Experimental and modelling study of CWPO over P-doped carbon black catalysts
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abstract
The catalytic wet peroxide oxidation (CWPO) of 4-nitrophenol (4-NP) with phosphorous doped carbon
black catalysts (P-CB) was studied in the present work. The effect of reaction time (0-8 h), temperature
(50-80 ºC) and initial pH (2-4) on 4-NP removal and hydrogen peroxide consumption was investigated.
Results exhibited the presence of an induction period showing an inverse dependence with the operating
temperature and initial pH (pH0). The power law model described well the reaction rates of 4-NP removal
and hydrogen peroxide consumption. The slow initial rates were reproduced by taking into account the
evolution of pH, expressed in terms of proton concentration in the model. Fitted kinetic equations and
estimated parameter values are summarized in Table 1. As can be seen in Figure 1, the kinetic model
properly describes the oxidation process.
