In the decomposition of perchloroethylene (PCE) by gamma-rays, clay from tidal flat sediments showed an efficient catalytic activity. Moreover, the clay thermally treated at 700 °C in air enhanced the PCE removal efficiency better than that of the well known catalyst Degussa P-25 TiO2. The change of the clay by the thermal treatment was identified by electron paramagnetic resonance (EPR) spectroscopy. The intensity of the signal that arises from the natural radiation defect was decreased with increasing thermal treatment temperature, and inversely dependent on the PCE removal efficiency.
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