采用水热合成法和超声机械混合法制备了不同质量比的BiO_2-x/Bi₂WO₆。对催化剂进行了结构及光电化学性能表征，并在可见光下用超声波研究了其对四环素的降解效果。结果表明，当m（BiO_2-x）∶m（Bi₂WO₆）=2∶1时，BiO_2-x/Bi₂WO₆光催化剂表现出的光催化活性最高，并且在超声和可见光联合作用下其对四环素降解的时间会大大缩短。经过6次循环试验之后，BiO_2-x/Bi₂WO₆仍然表现出较高的稳定性。催化剂活性的增加归因于超声波的机械混合作用，超声波将层状BiO_2-x分散在球形Bi₂WO₆上，加速了电子转移和分离。

BiO_2-x/Bi₂WO₆ with different mass ratio is prepared by means of hydrothermal method and ultrasonic mechanical mixing method. The structure and photoelectrochemical characterization of the catalyst is carried out, and the degradation of tetracycline over the catalyst is studied by ultrasonic wave under visible light. The results indicate that BiO_2-x/Bi₂WO₆ photocatalyst with a molar ratio of 2∶1 between BiO_2-x and Bi₂WO₆ has the highest photocatalytic activity, over which the degradation time of tetracycline can be greatly shortened when ultrasound and visible light are combined. After 6 cycles of experiments, BiO_2-x/Bi₂WO₆ still shows high stability. The increase in catalyst activity is attributed to the mechanical mixing of ultrasonic waves, which can disperse the layered BiO_2-x on the spherical Bi₂WO₆, and accelerate the transfer and separation of electron.

冯兰惠(1996-),女,硕士研究生,研究方向为光催化,1687466106@qq.com