Facile synthesis of Z-scheme composite of TiO2 nanorod/g-C3N4 nanosheet efficient for photocatalytic degradation of ciprofloxacin. (20th April 2020)

• Record Type: Journal Article
• Authors: Hu, Kang; Li, Ruiqi; Ye, Chenlu; Wang, Anqi; Wei, Weiqi; Hu, Di; Qiu, Rongliang; Yan, Kai
• Is Part Of: Journal of cleaner production. Volume 253(2020)
• Publication Date: 2020-04-20
• Subjects: photocatalytic degradation -- Ciprofloxacin -- TiO2 nanorod/g-C3N4 nanosheet -- Kinetics -- Mechanisms; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.120055
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Developing efficient and robust photocatalyst is crucial for antibiotic degradation in water treatment. In this study, the Z-scheme nanocomposite of 1D/2D TiO2 nanorod/g-C3 N4 nanosheet was successfully fabricated for the efficient photocatalytic degradation of ciprofloxacin (CIP). 93.4% degradation of CIP was achieved in 60 min under the conditions of the nanocomposite containing 30 wt% g-C3 N4, 15 μmol L −1 CIP and pH of 6.3. The effect of catalysts, CIP concentrations and pH on degradation were systemically studied. It was found that the photodegradation process fitted the pseudo-first-order kinetic model well when CIP concentration was higher than 10 μmol L −1 . Under simulated sunlight irradiation, the nanocomposite exhibited 2.3 and 7.5-times CIP photodegradation rate than those of commercial TiO2 powder and g-C3 N4 nanosheet, respectively. Besides, degradation kinetics and mechanisms were further investigated. Scavenging experiments and electron spin resonance (ESR) technique confirmed that h + and ·OH played a major role in the CIP degradation process. Three CIP degradation pathways were subsequently proposed. This work may provide an effective strategy to remove various antibiotics in water treatment. Highlights: Z-scheme nanocomposite of 1D/2D TiO2 nanorod/g-C3 N4 nanosheet was fabricated. The nanocomposite was efficient for photocatalytic degradation of ciprofloxacin. h + and ·OH played a major role in the CIP degradation process. The photocatalytic degradation mechanisms for ciprofloxacin were discussed.