Comments on the published article 'Effects of hydroxyl radicals and oxygen species on the 4-chlorophenol degradation by photoeletrocatalytic reactions with TiO2-film electrodes by J. Yang, J. Dai, Ch. Chen, J. Zhao; J. Photochem. Photobiol. A: Chem. 208 (2009) 66-77'

摘要

On the basis of isotopic tracer experiments with ~(18)OH2, Yang et al. [1] have claimed recently that OH radicals appearing in the primary hydroxylated intermediates of the photoeletrocatalytic oxidation of 4-chlorophenol on TiO2-thin film electrodes, are mainly generated via oxidation of water species adsorbed on the semiconductor surface with photogenerated valence band (VB) free holes, ht, according to reaction (1) h_f~+ + (OH2)_(ads)→OH_(ads)~·+H~+ (1).