Photocatalytic decontamination of tetracycline and Cr(VI) by a novel α-FeOOH/FeS2 photocatalyst: One-pot hydrothermal synthesis and Z-scheme reaction mechanism insight
[Display omitted] •3D Z-scheme α-FeOOH/FeS2 photocatalysts were fabricated by one-pot hydrothermal method.•The photocatalysts exhibits efficient Cr(VI) reduction and Tetracycline degradation performance.•The heterogeneous nanostructures was formed by O in FeOFe group be replaced by S in FeSFe group....
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Veröffentlicht in: | Journal of hazardous materials 2020-10, Vol.397, p.122580, Article 122580 |
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Sprache: | eng |
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•3D Z-scheme α-FeOOH/FeS2 photocatalysts were fabricated by one-pot hydrothermal method.•The photocatalysts exhibits efficient Cr(VI) reduction and Tetracycline degradation performance.•The heterogeneous nanostructures was formed by O in FeOFe group be replaced by S in FeSFe group.•The photo-absorption properties of α-FeOOH/FeS2 photocatalyst enhanced the redox ability.•A highly effective separation of photo-induced charge carriers system operated by a Z-scheme mechanism.
Tetracycline and Cr(VI) as non-biodegradable environmental contaminants have attracted increasing attention because of their chronic toxicity. In this regard, the environmentally friendly Z-scheme photocatalytic decontamination system has been widely used for contaminant treatment. Herein, a novel 3D Z-scheme α-FeOOH/FeS2 composite photocatalyst was successfully synthesized for the first time via a simple one-pot hydrothermal method. X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) analyses and high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) demonstrated that the O component of the heterogeneous nanostructures formed by the FeOFe linkages in α-FeOOH was replaced by S to generate FeSFe linkages in the resulting FeS2. As expected, the novel 3D Z-scheme α-FeOOH/FeS2 composites exhibited remarkable photocatalytic activity for Cr(VI) reduction and tetracycline degradation compared to pure α-FeOOH. Photoluminesence (PL) measurement and electrochemical impedance spectroscopy (EIS), as well as density functional theory (DFT) calculations, suggested that the enhanced photocatalytic activity of the Z-scheme α-FeOOH/FeS2 composite can be attributed to the improved photo-absorption properties and the effective separation of photo-induced charge carriers caused by the Z-scheme system of the as-prepared 3D α-FeOOH/FeS2 composites. Thus, this work may facilitate the effective design of α-FeOOH-based photocatalysts. |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2020.122580 |