A Combined System of TiO2 Suspension and Platinum Electrodes Used for Photoelectrochemical Degradation of a Dye in NaCl Solution
Photoelectrochemical (PEC) degradation of Procion Red MX-5B was investigated in aqueous NaCl solutions. PEC degradation efficiencies showed strong dependence on the concentrations of aqueous NaCl solutions and applied potentials. 95% decolorization of the dye could be achieved in 10 minutes at applied potential of 8 V in 0.3 M NaCl solution, while the efficiency was only 35% by photocatalytic oxidation. Electrodegradation can be as powerful as PEC degradation upon dye decolorization when the potential exceeds 5 volts. However, it can not mineralize dye degradation intermediates by itself alone. PEC degradation performed very high TOC removal capacity and nearly 80% of total organic carbon was removed in the first hour of reaction, compared with 50% removal in PCO process during the same period.
Zhenyu Du and Bin Liu
W. J. Zhang et al., "A Combined System of TiO2 Suspension and Platinum Electrodes Used for Photoelectrochemical Degradation of a Dye in NaCl Solution", Applied Mechanics and Materials, Vols. 26-28, pp. 227-230, 2010