Pentachlorophenol.

This study focuses on the decomposition of pentachlorophenol(PCP) by an electron beam (E-beam) process. To attain this objective, we investigated the reactive species generated from E-beam process during irradiation (reaction time 0.6 s) and G-values of PCP decomposition and effects of pH and H2O2 as an additive. The effect of pH values was independent on the decomposition of PCP. However, during E-beam irradiation a scavenging effect of added H₂O₂ (＞ 1mM) for the decomposition of PCP was shown, which was supported by the decreased amounts of Cl? produced by the decomposition of PCP. Meanwhile, oxalic acid and unidentified organic chlorine compounds as by-products were increased by the addition of H₂O₂. Thus, in order to enhance the efficiency of PCP decomposition, the E-beam process has to consider a proper concentration of H₂O₂ as a well-known source of strong oxidant hydroxyl radical.