Preparation of a novel Z-scheme KTaO3/FeVO4/Bi2O3 nanocomposite for efficient sonocatalytic degradation of ceftriaxone sodium

Jing Qiao; Mengyao Lv; Zhihui Qu; Meng Zhang; Xin Cui; Di Wang; Congcong Piao; Zhiyu Liu; Jun Wang; Youtao Song

doi:10.1016/j.scitotenv.2019.06.416

Preparation of a novel Z-scheme KTaO₃/FeVO₄/Bi₂O₃ nanocomposite for efficient sonocatalytic degradation of ceftriaxone sodium

Sci Total Environ. 2019 Nov 1:689:178-192. doi: 10.1016/j.scitotenv.2019.06.416. Epub 2019 Jun 26.

Authors

Jing Qiao¹, Mengyao Lv¹, Zhihui Qu², Meng Zhang¹, Xin Cui², Di Wang², Congcong Piao¹, Zhiyu Liu¹, Jun Wang³, Youtao Song⁴

Affiliations

¹ College of Chemistry, Liaoning University, Shenyang 110036, People's Republic of China.
² College of Environment, Liaoning University, Shenyang 110036, People's Republic of China.
³ College of Chemistry, Liaoning University, Shenyang 110036, People's Republic of China. Electronic address: wangjun888tg@126.com.
⁴ College of Environment, Liaoning University, Shenyang 110036, People's Republic of China. Electronic address: ysong_tg@126.com.

PMID: 31279185
DOI: 10.1016/j.scitotenv.2019.06.416

Abstract

In this work, a novel Z-scheme sonocatalyst, KTaO₃/FeVO₄/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/FeVO₄/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/FeVO₄/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/FeVO₄/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/FeVO₄/Bi₂O₃ composite is an excellent Z-scheme sonocatalyst which can be used to effectively degrade the organic pollutants in wastewater under ultrasonic irradiation.

Keywords: Ceftriaxone sodium; Electron transfer driving force; FeVO(4) conductive channel; Sonocatalytic degradation; Z-scheme KTaO(3)/FeVO(4)/Bi(2)O(3) sonocatalyst.