In this study, Bi2O3 with band gap energy of 2.6 eV was coated on a Ti disk and used in a rotating disk reactor to treat 10 mg L-1 Rhodamine B (RB) solution under UV and visible light irradiation. The effects of different inorganic anions (including CO32-, S2-, SO42-, F- and Cl-) were investigated and the results shown that the color removal efficiency could be greatly improved in the presence of Cl-. RB adsorption capacity could be enhanced when Cl- was added and RB could further be degraded due to indirect dye self-photosensitization under visible light irradiation. The radicals generated during the reaction were detected by adding radical trapping agents and other experimental conditions like Cl- concentration, rotating speed and pH of the process were investigated and optimized. (C) 2012 Elsevier B.V. All rights reserved.