Fabrication of g-C3N4 nanosheet/Bi5O7Br/NH2-MIL-88B (Fe) nanocomposites: Double S-scheme photocatalysts with impressive performance for the removal of antibiotics under visible light
IF 5.6 2区 材料科学Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Nasrin Sedaghati, Aziz Habibi-Yangjeh, Alireza Khataee
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引用次数: 3
Abstract
Novel graphitic carbon nitride (g-C3N4) nanosheet/Bi5O7Br/NH2-MIL-88B (Fe) photocatalysts (denoted as GCN-NSh/Bi5O7Br/Fe-MOF, in which MOF is metal-organic framework) with double S-scheme heterojunctions were synthesized by a facile solvothermal route. The resultant materials were examined by X-ray photoelectron spectrometer (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence spectroscopy (PL), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflection spectroscopy (UV-vis DRS), photocurrent density, electrochemical impedance spectroscopy (EIS), and Brunauer–Emmett–Teller (BET) analyses. After the integration of Fe-MOF with GCN-NSh/Bi5O7Br, the removal constant of tetracycline over the optimal GCN-NSh/Bi5O7Br/Fe-MOF (15wt%) nanocomposite was promoted 33 times compared with that of the pristine GCN. The GCN-NSh/Bi5O7Br/Fe-MOF (15wt%) nanocomposite showed superior photoactivity to azithromycin, metronidazole, and cephalexin removal that was 36.4, 20.2, and 14.6 times higher than that of pure GCN, respectively. Radical quenching tests showed that ·O−2 and h+ mainly contributed to the elimination reaction. In addition, the nanocomposite maintained excellent activity after 4 successive cycles. Based on the developed n–n heterojunctions among n-GCN-NSh, n-Bi5O7Br, and n-Fe-MOF semiconductors, the double S-scheme charge transfer mechanism was proposed for the destruction of the selected antibiotics.
期刊介绍:
International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.