Hazardous pollutants, especially dyes and aromatic hydrocarbons constitute the effluents generated from textile Industries. Among the various technologies developed for the treatment of dyes, the heterogeneous photocatalysis is regarded as a promising technology to decompose the recalcitrant dyes into final non-toxic products. Nano TiO2 has been proved to be a very effective photocatalyst for the degradation of dyes in textile effluent because of its high stability, non-toxicity and low cost. Nano structured titanium dioxide (TiO2) has been synthesized by modified sol-gel method. The material was characterized by X-ray diffraction (XRD) and SEM micrograph. The results showed that pure nano TiO2 was composed of uniform distribution nanoparticles of ~ 15 nm and with spherical morphology. The present study aims in the photocatalytic degradation of dye reactive red 198 on the surface of nanoTiO2 in a batch reactor. Optimisation of parameters such as catalyst weight, concentration of the dye has been studied. All the experiments were performed in a photochemical batch reactor equipped with 8-W UV lamp emitting a peak wavelength around 254 nm. Under optimum conditions complete degradation of the organic dye was achieved and the photodegradation follows pseudo first order kinetics.