期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 248, 期 -, 页码 450-458出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.02.046
关键词
Tetracycline (TC); Photo-degradation; AgxO/FeOx/ZnO magnetic nanotubes; Interfacial charge transfer (IFCT); XRD; XPS; ZnO-FeOx intra-gap states
( )Evidence is presented for the enhanced photodegradation of tetracycline (TC) by AgxO/FeOx/ZnO nanotubes (NTs) compared to AgxO/ZnO nanotubes under low-intensity solar light irradiation. A higher amount of the local magnetic domains with random orientation in the AgxO/FeOx,/ZnO NTs lead to a faster TC-degradation. Fe introduces intra-gap states in the ZnO NTs facilitating the e-transport under light. The AgxO/FeOx/ZnO nanotubes were observed to present predominantly semiconductor behavior during the light induced TC-degradation. The nature of the interaction between non-polarized photos with the local domains due the addition of Fe is discussed. By X-ray photoelectron spectroscopy (XPS) redox reactions were observed on the nanotube surface NTs leading to the reactive oxygen radical species (ROS). The ROS-intermediates were identified by appropriate scavengers. Fast TC-degradation kinetics was attained by a catalyst with a composition AgOx(5.8%)FeOx(21.9%) ZnO (72.3%) as determined by X-ray fluorescence (XRF). A scheme for the interfacial charge transfer (IFCT) between the oxides on the nanotube surface is presented. Magnetized nanotubes present a practical potential in environmental cleaning avoiding the high cost separation of the catalyst from the reaction media at the end of the process
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