Synthesis of magnetic Z-scheme MoS2/CdFe2O4 composite for visible light induced photocatalytic degradation of tetracycline. (December 2022)

• Record Type: Journal Article
• Authors: Wang, Honggui; Ji, Ping; Zhang, Yongcai; Zhang, Ya
• Is Part Of: Materials science in semiconductor processing. Volume 152(2023)
• Publication Date: 2022-12
• Subjects: Antibiotics -- MoS2 -- Photocatalysis -- Spinel ferrites -- Tetracycline; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2022.107075
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: The overuse and dissemination of antibiotics caused serious threats to the environment and public health. In this work, a molybdenum disulfide-magnetic spinel ferrite composite (MoS2 /CdFe2 O4 ) with a low bandgap was designed and prepared by a two-step hydrothermal method. Compared with MoS2, CdFe2 O4 and other MoS2 /CdFe2 O4 composites, the 60% MoS2 /CdFe2 O4 composite showed best visible light induced photocatalytic activity towards tetracycline (TC) degradation reaction. More than 87% of TC (25 ppm) can be degraded under visible light till 120 min. The degradation of TC over the MoS2 /CdFe2 O4 composites followed the pseudo-first-order kinetics. The 60% MoS2 /CdFe2 O4 composite had largest apparent reaction rate constant of 11.36 × 10 −3 min −1 . Due to its magnetic property, the MoS2 /CdFe2 O4 composite with saturation magnetization value of 7.0 emu g −1 can be separated easily from water and reused. Based on the band structure and active species analysis, a Z-scheme structure was formed in the MoS2 /CdFe2 O4 composite, which accelerated photocatalytic oxidation. The hydroxyl radicals (˙OH) were detected under visible light irradiation and provided strong photocatalytic oxidation performance. This work may provide new ideas for designing visible light responsive and magnetic CdFe2 O4 photocatalysts. Graphical abstract: Image 1 Highlights: A Z-scheme molybdenum disulfide-spinel ferrite composite (MoS2 /CdFe2 O4 ) was prepared. The MoS2 /CdFe2 O4 showed visible light induced photocatalytic activity to tetracycline. The magnetic MoS2 /CdFe2 O4 could be removed easily from water and reused. The hydroxyl radical and holes were the major active species in TC degradation.