Anatase-phase titania: preparation by embedding silica and photocatalytic activity for the decomposition of trichloroethylene

摘要: Abstract Nanophase titania particles were prepared by the sol–gel process using two different precursors; titanium isopropoxide(TTIP) and ethoxide (TEOT). Silica-embedded was also from TEOT tera-ethyl-ortho-silicate (TEOS). In case of nanophase TTIP, rutile/anatase mixed phase had higher photoactivity than pure anatase in decomposition TCE. However, TEOT, increased with heat treatment temperature until rutile began to be formed. The surface area decreased temperature. that Degussa P25 anatase/rutile TTIP. Therefore, we concluded that, order achieve high photocatalytic activity, it important prepare at temperature, preferably without forming but not necessarily. This conclusion confirmed experimental result silica-embedded particle TEOT. embedding small amount silica into matrix enhanced thermal stability titaina resulting suppression transformation phase. enables us calcine accompanying reduce bulk defects, which are responsible for low activity.