采用水热法将PVP粘合剂负载于Bi₂WO₆上，制备出一种新型分层型的高比表面积催化剂，利用X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外-可见光漫反射（UV-Vis/DRS）及N₂吸附对其晶体结构、微观形貌、光学特性进行了表征。以亚甲基蓝（MB）为模型污染物来评价Bi₂WO₆的超声催化活性。研究了吸附、超声和Bi₂WO₆辅助超声催化3种情况下降解MB的降解效率的大小为：吸附<超声2WO₆声催化，表明Bi₂WO₆微球具有良好的超声催化活性。此外，还研究了超声功率、超声占空比、催化剂质量浓度对超声催化效率的影响。在超声功率为500 W、占空比为9∶1、催化剂质量浓度为1.5 g/L的最佳条件下，80 min后降解率达93.5%。Bi₂WO₆声催化降解MB过程与活性氧（ROS）的生成有关，其中过氧化氢（H₂O₂）和羟基自由基（·OH）在MB的声化学降解中起重要作用。

A kind of hierarchical structural Bi₂WO₆ microsphere catalyst with high specific surface area is prepared in the presence of polyvinylpyrrolidone (PVP) via an optimized hydrothermal method.The crystal structure,morphology and optical property of the prepared Bi₂WO₆ catalyst are characterized by X-ray diffraction (XRD),scanning electron microscope (SEM),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and N₂-adsorption.Its sonocatalytic performance is evaluated by using methylene blue (MB) as a model pollutant under the ultrasonic irradiation.The degradation efficiency is studied in three cases such as adsorptions only,ultrasound only and Bi₂WO₆ assisted sonocatalytic,which is found to be in the following order:adsorptions < ultrasounds < sonocatalysis.In addition,the degradation efficiency can achieve about 93.5% after 80 min under the optimum conditions that ultrasonic power is 500 W,ultrasonic pulse mode is 9:1 and the concentration of catalyst 1.5 g·L^-1.The degradation of MB in the presence of Bi₂WO₆ under ultrasonic irradiation is related to the generation of reactive oxygen species,in which both hydrogen peroxide (H₂O₂) and hydroxyl radical (·OH) play important roles in the sonochemical degradation of MB.

孙啊朋(1993-),男,硕士研究生,研究方向为超声空化与声化学,15829003933@163.com