Investigation on inorganic oxidant assisted sonocatalytic degradation of acid red B in the presence of nano‐sized TiO 2 powder

In this work, the effective degradation of Acid Red B dyes in aqueous solution was realized in various ultrasound (US)/TiO 2 /oxidant (KIO 4 , KIO 3 and K 2 S 2 O 8 ) systems. In addition, the degradation efficiencies of Acid Red B in US/TiO 2 /oxidant systems for a variety of oxidants were compared. The results revealed the obvious synergistic effects of sonocatalytic technology (ultrasonic irradiation combined with TiO 2 ) and oxidants (KIO 4 , KIO 3 , and K 2 S 2 O 8 ). Simultaneously, the effects of some operational parameters such as oxidant kind, ultrasonic irradiation time, solution acidity, oxidant concentration, and system temperature on the sonocatalytic degradation of Acid Red B have also been examined in this article. Under the same conditions, the degradation efficiency of Acid Red B dye was found to retain the order of US/TiO 2 /KIO 4 > US/TiO 2 /K 2 S 2 O 8 > US/TiO 2 /KIO 3 > US/TiO 2 > US. Particularly, by using US/TiO 2 /KIO 4 system this method can remarkably shorten the degradation reaction time and completely degraded the Acid Red B. The method of sonocatalytic degradation assisted with oxidants exhibits a widely applied foreground, therefore, should be a feasible choice for treating various organic wastewaters, especially, non‐ or low‐transparent dye wastewaters. © 2010 American Institute of Chemical Engineers Environ Prog, 2010