MIL-101(Fe)/g-C3N4 for enhanced visible-light-driven photocatalysis toward simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media
[Display omitted] •MIL-101(Fe)/g-C3N4 heterojunction hybrids were prepared by an in-situ technique.•The hybrid exhibits higher visible light driven photocatalysis.•Photocatalytic Cr(VI) reduction and bisphenol degradation are achieved simultaneously.•Better light absorption and photo-carrier separat...
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Veröffentlicht in: | Applied catalysis. B, Environmental Environmental, 2020-09, Vol.272, p.119033, Article 119033 |
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Sprache: | eng |
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•MIL-101(Fe)/g-C3N4 heterojunction hybrids were prepared by an in-situ technique.•The hybrid exhibits higher visible light driven photocatalysis.•Photocatalytic Cr(VI) reduction and bisphenol degradation are achieved simultaneously.•Better light absorption and photo-carrier separation are the keys to higher activity.
Heterostructured composites with an excellent photocatalytic activity have attracted increasing attention because of their great application in environmental remediation. Herein, a MIL-101(Fe)/g-C3N4 heterojunction was synthesized via in-situ growth of MIL-101(Fe) onto g-C3N4 surface. The heterojunctions were applied as a bifunctional photocatalyst for simultaneous reduction of Cr(VI) and degradation of bisphenol-A (BPA) under visible light and exhibited an obvious enhancement in photocatalytic performance compared with MIL-101(Fe) or g-C3N4. The improved activity could be attributed to the enhanced light absorption and efficient charge carrier separation by forming a direct Z-scheme heterojunction with appropriate band alignment between MIL-101(Fe) and g-C3N4. The radical trapping and electron spin resonance showed that photo-generated electrons are responsible for the reduction of Cr(VI) and BPA degradation, following an oxygen-induced pathway. This work provides new insight into the construction of metal-free semiconductor/MOFs heterojunctions as a bifunctional visible-light-driven photocatalyst for efficient and simultaneous treatment of multiple toxic pollutants in water. |
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ISSN: | 0926-3373 1873-3883 |
DOI: | 10.1016/j.apcatb.2020.119033 |