Author(s): Myun-Joo Lee; Jinho Jung; Jeong-Hyo Yoon; Hung-Ho Chung
Linked Author(s):
Keywords: EPR; Gamma-ray; Ozone; PCE; TCE; Titanium oxide
Abstract: Radiation treatment showed efficient removal of TCE and PCE. Almost all TCE and PCE were removed at an irradiation dose of 300 Gy in the presence of O_3 and TiO_2, where TiO_2 showed explicit enhancement of decomposition. The catalytic activity of TiO_2 was characterized by EPR spectroscopy and spin-trapping method. The EPR signal of TiO_2 was increased up to 15 % after gamma-irradiation, and this results in the increase of hydroxyl radical production by 5 %. Except for Cu`2+, TCE and PCE decomposition in the presence of metal ions was lineally dependent on the standard reduction potential of the metal ions. The extraordinary inhibition of Cu`2+ was caused by the action of Cu`2+ as a strong hydroxyl radical scavenger that was directly confirmed by EPR spectroscopy.
Year: 2001