Preparation Of CuWO₄-based Catalyst And Its Catalytic Ultrasonic Degradation Of Ofloxacin

CuWO4 is an important component of Metal Tungstate.The previous experimental research of this research group found that Metal Tungstates,such as Zinc Tungstate and Bismuth Tungstate,have good sonocatalytic activity,and after consulting a large number of related document,it was found that CuWO4 has good photocatalytic activity.It is similar to the sonocatalytic mechanism,and there are no reports on the field of CuWO4 catalyzed ultrasonic degradation of antibiotics wastewater.Therefore,we hope that our research group will explore the sonocatalytic activity of CuWO4 and hope to have a positive role in the treatment of antibiotics wastewater.Firstly,CuWO₄ nanoparticles were synthesized by hydrothermal method,and the products were characterized by X-ray diffraction?XRD?,scanning electron microscope?SEM?,energy dispersive spectrometer?EDS?,and Brunauer-Emmett-Teller?BET?.Then,oflofloxacin?OFL?was used as the degradation target,and the change in absorbance of the OFL solution during the degradation process was used as an indicator.The sonocatalytic activity of CuWO4was investigated under different experimental parameters.The degradation rate can reach 72.43%±3.11%.When ROS scavengers are used to detect the type of ROS during degradation,it is found that hydroxyl radicals?.OH?and holes?h⁺?play a major role in oxidation.Secondly,Fe³⁺/CuWO₄ nanoparticles were prepared using iron nitrate?Fe?NO₃?₃?as the iron ion(Fe³⁺)source,and characterized by XRD,SEM,and EDS.After that,the sonocatalytic activity of Fe³⁺/CuWO₄ was mainly investigated under different experimental parameters.The experimental results show that under the best experimental parameters,the Fe³⁺doping amount is 10%,the catalyst addition amount is 30 mg/mL,the initial solution concentration is 5 mg/L,the solution pH is7,the ultrasonic power is 450 W,and the ultrasonic time is 30 min.The OFL degradation rate can be Up to 92.21%±0.35%,Fe³⁺/CuWO₄ showed excellent sonocatalytic activity.It was proved by oxidation-extraction spectrophotometry thatFe³⁺/CuWO₄ catalyzed ultrasonic degradation of OFL was related to ROS generation.Finally,Br^-/CuWO₄ was prepared by hydrothermal method using potassium bromide?KBr?as the bromide ion?Br^-?source and characterized by XRD and SEM.Similarly,the sonocatalytic activity of Br^-/CuWO₄was investigated under different experimental parameters.The experimental results show that the Br^-/CuWO₄catalyzed ultrasonic degradation of OFL is related to the production of ROS after Br-doping CuWO4 is better than pure CuWO4.In summary,CuWO₄ has good sonocatalytic activity,and CuWO₄ can be improved in different degrees after being doped with different ions.The above three experimental results provide a basis for the research of CuWO4-based nanomaterials as acoustic catalysts for ultrasonic degradation of antibiotics wastewater.