Hollow flower-like polyhedral α-Fe2O3/Defective MoS2/Ag Z-scheme heterojunctions with enhanced photocatalytic-Fenton performance via surface plasmon resonance and photothermal effects

• Published in: Applied catalysis. B, Environmental Vol. 272; p. 118978
• Main Authors: Guo, Meijun, Xing, Zipeng, Zhao, Tianyu, Qiu, Yalu, Tao, Bing, Li, Zhenzi, Zhou, Wei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 05.09.2020; Elsevier BV
• Subjects: 2,4-Dichlorophenol; Catalytic activity; Design defects; Electromagnetic absorption; Ferric oxide; Heterojunctions; Hollow structure; Molybdenum disulfide; Nanoparticles; Photocatalysis; Photocatalytic-Fenton; Photodegradation; Photothermal effects; Plasma resonance; Polyhedra; Resonance; Salicylic acid; Silver; Superstructures; Surface plasmon resonance; Z-scheme; Hollow structure; Photothermal effects; Photocatalytic-Fenton; Surface plasmon resonance; Z-scheme
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2020.118978

•Novel ternary α-Fe2O3/defective MoS2/Ag Z-scheme heterojunction fabricated for the first time.•Photo-response range extended from UV–vis to infrared light region.•Excellent photo-Fenton catalytic performance in degrading organic pollutants.•Synergistic effect of Z-scheme structure, surface defects and surface plasmon resonance. Hollow Polyhedral superstructures can capture light effectively and have adjustable composite composition, which is useful for constructing Z-scheme systems. Here, rational design of hollow flower-like polyhedral α-Fe2O3/defective MoS2/Ag Z-Scheme heterojunctions is described, using polyhedral α-Fe2O3 as the template and via a one-pot hydrothermal and postdeposition strategy. The hollow flower-like polyhedral heterojunctions utilize multiple reflections of light in the hollow structure to achieve enhanced photocatalytic activity. Defective MoS2 acts as a link between α-Fe2O3 and Ag nanoparticles, providing a great deal of active sites and broadening the photoresponse region. Because of the enhancement of light absorption and surface plasma resonance of Ag, α-Fe2O3/defective MoS2/Ag has significant photothermal effect. The photogenerated carriers can be effectively separated by the construction of a Z-scheme system. Importantly, photocatalytic-Fenton degradation of 2,4-dichlorophenol and salicylic acid over hollow flower-like polyhedral α-Fe2O3/defective MoS2/Ag is higher than that of α-Fe2O3 and α-Fe2O3/defective MoS2.