Pure anatase-TiO
2
nanoparticles with 8 nm average crystallite size was synthesized hydrothermally at 200°C in 2 h. The structural and physicochemical properties of nano-TiO
2
were determined by powder XRD, FT-IR, BET and SEM analyses. The behavior of anatase nano-TiO
2
in catalytic degradation of Rhodamine B (RB) dye in transparent nano-TiO
2
sol under UV-light was examined as a function of irradiation power of UV-Iight, irradiation time, amount of nano-TiO
2
and initial RB concentration in the sol. Rhodamine B was fully degraded with the catalysis of the nano-TiO
2
in a short time as low as 60 min. Photocatalytic activity of the nano-TiO
2
for degradation of RB was compared with Degussa P-25 at optimum catalysis conditions determined for the nano-TiO
2
. It was found that, when compared to Degussa P-25, the nano-TiO
2
could be repeatedly used with increasing photocatalytic activity. It was found that the photodegradation obeys the pseudo first-order reaction kinetics with the rate constant of 0.0658 min
-1
, and the half period t
1/2
was 10.53 min.