Photoelectrocatalytic Oxidation of Methyl Orange on a TiO2 Nanotubular Anode Using a Flow Cell

This is consistent with the results shown in Figure 5, and indicates mass transport control

María José Martín de Vidales; Laura Mais; Cristina Sáez; Pablo Cañizares; Frank C. Walsh; Manuel A. Rodrigo; Christiane de Arruda Rodrigues; Carlos Ponce de León


Scholarcy highlights

  • Stricter legislation for environmental protection continue to be implemented worldwide and methods to control the occurrence of pollutants in wastewaters are considered strategically important
  • Methyl orange from water was removed by photocatalytic anodic oxidation method using a titanium dioxide array surface
  • The results indicate that an applied potential of 1.5 V and a flow rate of 100 L h-1 seem to be appropriate values of these parameters for an efficient oxidation of methyl orange by photoelectrocatalytic oxidation in this study
  • The values of rate constant are similar to those obtained by Martín de Vidales et al, for the removal of persistent organic pollutants in wastewaters by conductive diamond electrochemical oxidation and electro-irradiated processes
  • An increase in the flow rate improves the efficiency of the process which suggests that, at the electrode potential used, the process is mass transport controlled
  • When the electrode potential increases the process efficiency does not improve might be because the oxidant agents generated are not sufficient to degrade the organic molecule or the structure and conductivity of titanium dioxide nanotubes might be degraded at the high positive potential of 1.75 V vs. Ag/AgCl, 4
  • The processes can be fitted to pseudo-first order kinetics and the apparent rate constants are calculated, indicating that the oxidation rate increases with the flow rate and decreases at more positive applied potentials

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