This paper presents the decolorization of p-Dimethylaminobenzalrhodanine using titanium dioxide nano-particles under
photocatalytic process at various buffer media under air atmosphere. Several effective agents including nano-photocatalyst
loading, illumination time, pH of medium and initial dye concentrations have been subjected to be estimated. Furthermore,
kinetic investigations of photocatalytic process fitted the pseudo-first-order kinetic for dye decolorization at all considered buffer
media. Then Langmuir-Hinshelwood model was applied for evaluation of photodecolorization rate constant (kr) and adsorption
constant KA for all media. Spectrophotometric monitoring showed that the titled dye is nearly decolorized completely after 9-15 h
and 3.5 h at buffer pHs of 9-12 and pH of 13 under high pressure irradiation respectively.