Dongxu Li

Date of Award


Degree Type


Degree Name

Master of Engineering Science


Chemical and Biochemical Engineering


Dr. Madhumita B. Ray

Second Advisor

Dr. Jesse Zhu


E. coli bioaerosol was disinfected using an indoor air purification device that is composed of an annular photocatalytic reactor with a baffle system inside and a gas buffer tank. Activated carbon supported photocatalyst 10%Ti02-10%Si02/AC prepared by dip coating method, using 10 wt% colloidal silica and 10 %(w/v) TiCb, has the highest photocatalytic oxidation activity and was used for the E. coli bioaerosol disinfection tests in terms of air flow rate, UV intensity, TiC>2 loading, and photocatalyst preparation methods. The results showed that it took longer time to completely disinfect E. coli if the flow rate is higher. Higher UV intensity significantly reduced the E. coli disinfection time. E. coli disinfection rate increased when the TiC>2 loading going up from

1 to 10 %(w/v). E. coli disinfection efficiency can also be improved by adding colloidal silica into the impregnation suspension when the activated carbon supported photocatalysts were prepared.



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