Nanoparticles of titanium dioxide

(TiO2) (average size ~ 5 – 579 nm) with a high

surface area (~ 192 m2 g-1) were synthesized in

the pure anatase phase, either with or without

H2O2, using isopropanol or acetic acid as a

reaction medium. TiO2 was characterized by

using XRD, BET surface area, STEM and UVVisible

techniques. TiO2 was obtained differed

according to the reaction medium used.

Bandgap energy values observed for TiO2 with

H2O2 were 3.10 for TiO2 with IP, and 2.97 for TiO2

with HAc. Values when H2O2 was not used were

3.07 for TiO2 obtained with IP and 3.40 with HAc.

The catalytic activity of TiO2 in solutions of H2O2

was studied by examining the decolorization of

methylene blue in the dark. The decolorization in

the presence of pretreated TiO2 of approximately

100% was obtained within 7h in the presence of

TiO2 obtained in HAc and presence of H2O2.