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This study investigated TiO2 photocatalysis disinfection efficiency on spores of B. subtilis under black light, sunlight and indoor natural daylight with the aid of H2O2. It was found that disinfection efficiency from sunlight irradiation (UVA intensity of 5.93-18.2 W/m2) was higher than that from black light irradiation (UVA intensity of 13.5 W/m2) and indoor natural daylight (UVA intensity of 0 W/m2), respectively. A 95.3% spore removal within 1 h occurred when sunlight UVA intensity reached 23.45 W/m2 with the assistance of 80 mM H2O2. Between 9 am and 4 pm (min-max UVA intensity of 8.49-23.45 W/m2), spore removal did not significantly vary (p>0.05).
Keywords: solar photocatalysis; spore removal; B. subtilis; water disinfection; TiO2.