Jing Qiao, Hongbo Zhang, Siyi Li, Meng Zhang, Jun Wang,

                                                                                  College of Chemistry, Liaoning University

                                                                                      Guanshu Li, Youtao Song, Zhihui Qu,

                                                                                College of Environment, Liaoning University

Abstract

A ternary SrTiO₃/Ag₂S/CoWO₄ composite as an effective Z-scheme sonocatalyst was prepared. X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy were applied for characterization of prepared samples. Tetracycline (TTC) was used as a target pollutant for investigating performance of Z-scheme SrTiO₃/Ag₂S/CoWO₄ sonocatalyst. Some affecting factors, ultrasonic irradiation time, ultrasonic irradiation power, solution pH, recycling times, sonocatalyst dosage and initial TTC concentration, on sonocatalytic degradation were explored and trapping experiments of free radicals (% OH and h⁺) were also carried out. The sonocatalytic degradation route of TTC was confirmed based on the intermediates. The experimental results revealed that, because of existence of Ag₂S as trapezoid electronic channel and co-catalyst, Z-scheme SrTiO₃/Ag₂S/CoWO₄ composite displayed outstanding sonocatalytic performance. Therefore, it can be predicted that SrTiO₃/Ag₂S/CoWO₄ as Z-scheme sonocatalyst has potential application in environmental purification.

Read the full article here:   62-Fabrication of a novel Z-scheme SrTiO3Ag2SCoWO4 composite and its application in sonocatalytic degradation of tetracyclines.pdf