Abstract:
The TiO2 nanoparticles were successfully synthesized through simple the combination of the sol-gel method and heat treatment. Nano-solid particles were verified by energy dispersive X-ray spectroscopy (EDS), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The degradation efficiency of rhodamine B was investigated by the combination of nano-solid particles and agitation under ultrasonic radiation. Then, the effects of different factors on the degradation efficiency of rhodamine B were studied in this reaction system. Moreover, the added air bubbles into the solution and physical adsorption of nano-solid particles which can affect the degradation efficiency were investigated. The results show that both nanoparticles and ultrasonic-mechanical stirring have significant effects on the degradation efficiency. Nano-solid particles provide more nucleation sites of cavitation bubbles for the reaction, agitation makes the degradation process more intense. The optimum reaction conditions were as follows: speed of 500 r/min, frequency of 40 kHz, power of 300 W, pH value of 7, initial concentration of rhodamine B of 20 mg/L and addition of titanium dioxide of 500 mg/L. Under optimum conditions, the most degradation rate of rhodamine B was 98.6%.
