Abstract:
To study the efficiency of photocatalytic air purifier sheet to remove bacteria in the indoor air. The experiment used 1 m³ chamber (1,000 Liter), temperature was controlled at 25 ± 2°C and relative humidity was at 60 ± 5%. The experiment employed two strains of bacterial, which were Bacillus subtilis and Staphylococcus epidermidis. The area of air purifier sheet was 0.23 m². The reaction time was 120 minutes. The experiment used UV light from two light sources, which were Fluorescent lamp at intensity of 1.0, 3.0, and 3.7 µW/cm² and Blacklight lamp at intensity of 70, 220, and 270 µW/cm². The results showed that Blacklight lamp at 270 µW/cm² of UV intensity had the best removal of both bacteria as well as the maximum removal rate constant. The removal efficiency for Bacillus subtilis and Staphylococcus epidermidis was 45.93 and 81.92%, respectively, while the removal rate constant was 0.0053 min⁻¹ and 0.0258 min⁻¹, respectively. The statistical analysis of removal efficiency of different UV light intensity from two light sources showed significant difference at 95% confidence limit (p=0.000). The removal efficiency of Staphylococcus epidermidis was higher than Bacillus subtilis having significant difference at 95% confidence limit (p=0.000-0.004).