Oxygen-rich bismuth oxychloride BiOCl materials: construction, characterization, and sonocatalytic degradation performance.

In this study, a series of oxygen-rich bismuth oxychloride BiOCl samples were prepared at different calcination temperatures and characterized by X-ray diffraction patterns, UV-Vis diffuse reflectance spectra, scanning electron microscope, X-ray energy dispersion spectroscope, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy. The calcination temperature greatly affected microstructures and band structures of as-prepared samples, further influencing sonocatalytic degradation efficiencies over dye Rhodamine B. Some dependant factors such as ultrasonic power, catalyst dosage, pH value, initial concentration of Rhodamine B, and reaction temperature were systematically investigated and the robust sample BiOCl-550 with a favorable microstructure and band structure provided the best sonocatalytic removal efficiency around 90% at the optimal condition. Based upon reactive species entrapping and hydroxyl radical detection experiments, a primary sonocatalysis mechanism was eventually speculated.