A 2D/2D S-scheme photo-Fenton catalyst based on ultrathin Bi 2 MoO 6 and Fe 2 O 3 hexagonal nanosheets for efficient tetracycline degradation

• Published in: Catalysis science & technology 2021-04, Vol.11 (8), p.2948-2956
• Main Authors: Wang, Wenliang, Zhao, Wenli, Huang, Huimin, Chen, Ruyao, Shi, Haifeng
• Format: Article
• Language: English
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/D1CY00051A

In order to solve the increasingly serious environmental pollution and energy crisis as soon as possible, engineering of two-dimensional/two-dimensional (2D/2D) S-scheme heterojunctions is in the spotlight. Herein, two-dimensional/two-dimensional (2D/2D) S-scheme Fe 2 O 3 /Bi 2 MoO 6 was designed and fabricated through a facile hydrothermal strategy, which constructed an advanced photocatalytic-Fenton coupling system. With the assistance of a low concentration of H 2 O 2 , the 2D/2D Fe 2 O 3 /Bi 2 MoO 6 with an Fe 2 O 3 weight ratio of 0.5% displayed significantly enhanced photo-Fenton catalytic activity toward tetracycline, which was 3.2 and 2.0 times that of Fe 2 O 3 and Bi 2 MoO 6 , respectively. The markedly enhanced photo-Fenton catalytic activity was attributed to the large surface area and efficient charge transfer of 2D/2D S-scheme Fe 2 O 3 /Bi 2 MoO 6 , as well as the photo-Fenton system constructed by H 2 O 2 and continuous Fe 3+ /Fe 2+ conversion under visible light irradiation. According to the active species trapping experiments and photoluminescence spectra, a novel 2D/2D S-scheme charge transfer mechanism of Fe 2 O 3 /Bi 2 MoO 6 was reasonably proposed. Fe 2 O 3 /Bi 2 MoO 6 composites displayed a broad application prospect due to their recyclability demonstrated by the cycling experiments. This work provides strong evidence that 2D/2D S-scheme Fe 2 O 3 /Bi 2 MoO 6 heterostructures are promising candidates for the photo-Fenton treatment of antibiotics.