TiO2 thin films were coated on 100 meshes stainless steel 304 (SS304) sieves by using the sol-gel method followed by 200 °C thermal treatment in this study. The SEM-EDS analysis of the TiO2 coatings showed the thin films were composed mainly of TiO2
and SS304 substrate, no significant levels of impurities were found using our coating process. The prepared TiO2-coated sieves were then employed to set up a modified version of out self-designed photocatalytic reactor to evaluate their bactericidal abilities. Little information
about the ability of TiO2 thin films to kill bioaerosols has been reported before. The results show that the bactericidal efficiency rate improved from 42.2 to 70.6% when the relative humidity values of the air decreased from 99 to 57% with a 20 l/min gas feed flow rate. Most bacteria
(>94%) can be removed after they have been treated by the designed photocatalytic reactor under a high fed flow rate (12.5 l/min). Compared to control experiments (UV OFF test) and to a high humidity test, the photokilling abilities of the developed TiO2 coated sieves, at low
humidity, were demonstrated. It was also obvious that the removal efficiency was consistent when the reactor operated continuously for 3 hours. With the advantages of a large contact area with the target bioaerosol, low headloss, durable substrate, and easy maintenance, the TiO2-coated
sieves possess high potential for application in the photocatalytic deactivation of airborne pathogens.
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