Degradation of oxytetracycline hydrochloride using photocatalysis in the presence of Fe3O4/rGO/Co-doped ZnO/g-C3N4 nanocomposite particles: Experiment, modeling, optimization and mechanistic evaluation. (December 2022)

• Record Type: Journal Article
• Authors: Shan, Junyue; Wu, Xianliang; Li, Caifang; Hu, Jiwei; Zhang, Zhenming; Liu, Huijuan; Xia, Pinhua; Huang, Xianfei
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Carbon nitride matrix composites -- Photocatalytic degradation -- Oxytetracycline hydrochloride -- Artificial neural network -- Magnetic separation; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104941
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: In recent years, semiconductor materials have shown excellent potential in the field of photocatalytic degradation of antibiotics. To prepare a photocatalyst with excellent performance, an Fe3 O4 /rGO/Co-doped ZnO/g-C3 N4 tetrameric hybrid photocatalyst was successfully prepared for the first time by means of chemical precipitation using graphene oxide as the precursor. The developed quaternary photocatalyst was used for the degradation of oxytetracycline hydrochloride (OTC), and its photocatalytic activity was investigated. The structure and morphology of the composites were characterized by XRD, SEM, HR-TEM, ESR, N2 adsorption, PL spectroscopy and UV-Vis DRS. The effects of different parameters on the degradation process were studied by the response surface method and artificial intelligence. The results showed that Fe3 O4 /rGO/Co-doped ZnO/g-C3 N4 was successfully synthesized. Under optimal conditions, the degradation rate of OTC was approximately 82% (the Fe3 O4 /rGO/Co-doped ZnO/g-C3 N4 dose was 0.16 g, the pH was 7.0, the initial concentration of OTC was 30 mg/L, and the visible light irradiation time was 70 min). pH is the most influential variable for OTC removal. At the same time, the degradation rate of OTC remained above 50% after 5 times of recycling, indicating that Fe3 O4 /rGO/Co-doped ZnO/g-C3 N4 photocatalyst had good stability and recoverability. In addition, the results of ESR and radical trapping experiments showed that·O2 - and·OH were the main active species in the OTC removal process. Graphical Abstract: ga1 Highlights: The prepared tetrameric hybrid photocatalyst effectively degrades oxytetracycline hydrochloride. Fe3 O4 /rGO/Co-doped ZnO/g-C3 N4 nanomaterials are rapidly separated after the degradation process. Artificial intelligence is used to model and optimize the degradation process. ∙OH and ∙O2 - are the main oxidizing species.