Efficient photocatalytic dye degradation by flowerlike MoS2/SrFe12O19 heterojunction under visible light.

[Display omitted] • SrFe 12 O 19 /MoS 2 heterojunction composite are synthesized via hydrothermal method. • The exposed interface reduce the recombination rate of the photogenerated carrier. • The composite achieved high degradation rate with magnetic recovery ability. Photocatalysis is one of the most promising technologies in wastewater treatment. Efficient degradation under visible light and the recovery capability of the photocatalyst are crucial in real-word applications. Herein, M−type SrFe 12 O 19 was integrated into the surface of flowerlike MoS 2 microsphere via the hydrothermal method. As-prepared SrFe 12 O 19 /MoS 2 composite photocatalyst has effective visible light response and magnetic recovery ability. The SrFe 12 O 19 /MoS 2 composite achieved 97% degradation rate for methylene blue under visible light. The photocatalytic reaction rate of the SrFe 12 O 19 /MoS 2 composite was nearly twice that of pure MoS 2. Transient steady-state fluorescence spectrometry and electrochemical spectrometry revealed that an appropriate amount of SrFe 12 O 19 effectively improves the charge transfer rate and accelerates photoinduced charge carrier separation. The possible photocatalytic degradation mechanism of the SrFe 12 O 19 /MoS 2 composite with the p–n heterojunction was also examined. [ABSTRACT FROM AUTHOR]