Influence of persulfate ions on the removal of phenol in aqueous solution using electron beam irradiation

摘要

The removal of phenol (Co = 100 μM) during electron beam irradiation was studied in pure water and in the presence of HCO_3~- and Br~- ions. It was found that the introduction of S_2O_8~(2-) ions (1 mM), by generating S)_4~-· radicals increases the radiation yield of phenol removal. 90% removal of phenol was obtained with radiation doses 600 and 1200 Gy with and without S_2O_8~(2+) ions respectively. This system induced smaller oxygen consumption with smaller concentration of catechol and hydroquinone found in the solution. HCO_3- and Br~- have an inhibiting effect in the presence as in the absence of S_2O_8~(2-0. In most cases, the introduction of S_2O_8~(2+) ions in water radiolysis system can advantageously increase the yield of organic compounds removal by oxidation.