Jing Qiao, Mengyao Lv, Meng Zhang, Congcong Piao, Zhiyu Liu, Jun Wang

College of Chemistry, Liaoning University

Zhihui Qu, Xin Cui, Di Wang, Youtao Song

College of Environment, Liaoning University

Graphical Abstract

Abstract

In this work, a novel Z-scheme sonocatalyst, KTaO₃/FeVO_4/Bi₂O₃, is prepared via ultrasonic-assisted isoelectric point method. The prepared samples are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectroscopy. The catalytic activity of Z-scheme KTaO₃/FeVO_4/Bi₂O₃ sonocatalyst is studied in degradation of ceftriaxone sodium under ultrasonic irradiation. In addition, the influences of ultrasonic irradiation time, scavengers and sonocatalyst used times on sonocatalytic degradation of ceftriaxone sodium are examined. Under the experimental conditions of 150 min ultrasonic irradiation time, 1.00 g/L KTaO₃/FeVO_4/Bi₂O₃ addition amount and 10.00 mg/L ceftriaxone sodium concentration, the sonocatalytic degradation ratio of ceftriaxone sodium achieves 81.30%. Finally, the possible sonocatalytic degradation mechanism of ceftriaxone sodium caused by Z-scheme KTaO₃/FeVO_4/Bi₂O₃ sonocatalyst is proposed. The enhanced sonocatalytic activity may be attributed to the fact that the FeVO₄ as a special conductive channel provides a strong driving force to transfer electrons through valence state changes of iron and vanadium, which accelerates electron transfer from conduction band (CB) of _/Bi₂O₃ to valence band (VB) of KTaO₃. Perhaps, the KTaO₃/FeVO_4/Bi₂O₃ composite is an excellent Z-scheme sonocatalyst which can be used to effectively degrade the organic pollutants in wastewater under ultra-sonic irradiation.

Read the full article here:   96-Preparation of a novel Z-scheme KTaO3FeVO4Bi2O3 nanocomposite for efficient sonocatalytic degradation of ceftriaxone sodium.pdf