Fe–In2O3 Induced Catalytic Degrading Congo Red under Ultrasonic Irradiation

In this work, the azo dye Congo red (CR) was degraded by a Fe–In 2 O 3 catalyst under the irradiation of ultrasonic. The Fe–In 2 O 3 catalyst was prepared by a fast and moderate solvothermal method followed by the characterization of X-ray diffraction and scanning electron microscope. The effects of operating parameters, such as catalyst composition, catalyst dosage, initial dye concentration, ultrasonic power and ultrasonic frequency on degradation process were discussed. In the experiment, the optimum CR removal of 97.75% in 60[Formula: see text]min was achieved under the conditions, i.e., catalyst dosage of 0.06[Formula: see text][Formula: see text], CR concentration of 10[Formula: see text][Formula: see text], ultrasonic frequency of 45[Formula: see text]kHz and ultrasonic power of 100[Formula: see text]W. Besides, the CR degradation behavior by the catalyst with ultrasonic is well in accordance with the first-order kinetic model.