Synergistic photosensitized removal of Cr(VI) and Rhodamine B dye on amorphous TiO2 under visible light irradiation

► Am-TiO2 was prepared at room temperature. ► Am-TiO2 exhibited more significant synergistic effect than commercial P25-TiO2. ► Heat pretreatment of Am-TiO2 led to decreased synergistic activity. ► Specific surface area dominates the synergistic degradation dynamics. ► Am-TiO2 can be simply reused with negligible loss of activity.