Khataee, AlirezaKayan, BerkantGholami, PeymanKalderis, DimitriosAkay, SemaDinpazhoh, Laleh13.07.20192019-07-2913.07.20192019-07-2920171350-41771873-2828https://doi.org/10.1016/j.ultsonch.2017.05.023https://hdl.handle.net/20.500.12451/5707ZrO2-biochar (ZrO2-BC) nanocomposite was prepared by a modified sonochemical/sol-gel method. The physicochemical properties of the prepared nanocomposite were evaluated using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence, Fourier transform infrared spectroscopy and Brtmauer-Emmett-Teller model. The sonocatalytic performance of ZrO2-BC was investigated in sonochemical degradation of Reactive Yellow 39 (RY39). The high observed sonocatalytic activity of the ZrO2-BC sample could be interpreted by the mechanisms of sonoluminescence and hot spots. Parameters including ZrO2-BC dosage, solution pH, initial RY39 concentration and ultrasonic power were selected as the main operational parameters and their influence on RY39 degradation efficiency was examined. A 96.8% degradation efficiency was achieved with a ZrO2-BC dosage of 1.5 g/L, pH of 6, initial RY39 concentration of 20 mg/L and ultrasonic power of 300 W. In the presence of (OH)-O-center dot radical scavengers, RY39 degradation was significantly inhibited, providing evidence for the key role of hydroxyl radicals in the process. The sonodegradation intermediates were identified using gas chromatography-mass spectroscopy and the possible decomposition route was proposed.eninfo:eu-repo/semantics/embargoedAccessZrO2 NanoparticlesZrO2-biochar NanocompositeBiocharSonocatalystNanocatalystSonocatalysisArticle3954054910.1016/j.ultsonch.2017.05.02328732979Q1WOS:000407185600061N/A