Usage of titanium nanomaterial for the decolorization of Methylene blue and Reactive Red 198 dyes by sonocatalysis
Emine Baştürk, Mustafa Işık, Mustafa Karataş
Abstract
ABSTRACT The aim of this study was to use non-modified nano titanium dioxide (TiO 2 ) material to develop the sonocatalytic decolorization of Methylene blue (MB) and Reactive Red 198 (RR198) in aqueous solutions. The study is highlighted by the pH pzc value of nano TiO 2 . Electrostatic attraction or repulsion can occur due to anionic (RR198) and cationic (MB) dyes. The maximum sonocatalytic decolorization efficiency (%) of 95% for MB and 81% for RR198 were achieved with an initial dye concentration of 100 mg L –1 , a sonocatalyst dosage 0.25 g L –1 (MB) and 0.1 g L –1 (RR198), an initial pH of 6.55, ultrasonic power of 90 W and ultrasonic frequency of 53 kHz. The thermodynamic parameters showed that the process was feasible and exothermic. In addition, the usage of non-modified TiO 2 particles was found to be a feasible choice and give satisfactory results for the removal of aniline (cationic) and azo (anionic) dyes without the requirement of highly expensive modified methods.