| Abstract: | Decolourization and COD removal from synthetic wastewater containing Reactive Brilliant Orange K‐R (RBOKR) dye using sonophotocatalytic technology was investigated. Experimental results showed that this hybrid technology could efficiently remove the colour and reduce COD from the synthetic dye‐containing wastewater, and that both processes followed pseudo first‐order kinetics. At the condition of 0.1 m3 h?1 airflow, 0.75 g dm?3 titanium dioxide and 0.5 mmol dm?3 RBOKR solution, the rate constants of decolourization and COD removal were 0.0750 and 0.0143 min?1 respectively for the sonophotocatalytic process; 0.0197 and 0.0046 min?1 respectively for the photocatalytic process and 0.0005 and 0.0001 min?1 respectively for the sonochemical process. The rate constants of sonophotocatalysis were greater than that of both the photocatalytic and sonochemical processes either in isolation or as a sum of the individual process, indicating an apparent synergetic effect between the photo‐ and sono‐processes. Copyright © 2003 Society of Chemical Industry |
