Fabrication of a Porous TiO2-Coated Silica Glass Tube and Its Application for a Handy Water Purification Unit. (14th May 2014) - Ochiai, Tsuyoshi
Abstract : A simple, handy, reusable, and inexpensive water purification unit including a one-end sealed porous amorphous-silica (a-silica) tube coated with 2 μ m of porous TiO2 photocatalyst layers has been developed. Both TiO2 and a-silica layers were formed through outside vapor deposition (OVD). Raman spectrum of the porous TiO2 -coated a-silica glass tube indicated that the anatase content of the TiO2 layers of the tube was estimated to be approximately 60 wt%. Developed porous TiO2 -coated a-silica glass tube has been assayed for the tube filtering feature against Escherichia coli ( E. coli ) solution used as one of the typical bacteria size species or Qβ phage also used as typical virus size species and compared with the feature of porous a-silica tubes alone. The tubes removed E. coli completely from the aqueous suspension which contained 10 6 CFU/mL of E. coli without UV irradiation. The porous TiO2 -coated a-silica glass tube with UV-C lamps successfully reduced the Qβ phage amount in the suspension from 10 9 to 10 3 PFU/mL.