NaGdF₄:Yb,Er@ZIF-8/MnO₂ for photocatalytic removal of organic pollutants and pathogenic bacteria

Abstract

In the field of environmental science, efficient removal of organic pollutants and pathogenic bacteria from wastewater using a photocatalytic process that responds to the full spectrum of sunlight is crucial. In this study, a highly effective nanoheterojunction called NaGdF₄:Yb,Er@zeolitic imidazolate framework-8/manganese dioxide (NaGdF₄:Yb,Er@ZIF-8/MnO₂, UCZM) was synthesized. This nanoheterojunction exhibits a remarkable ability to respond to the entire range of ultraviolet, visible, and infrared light. Under simulated sunlight, UCZM demonstrated outstanding performance in degrading malachite green dye, with a degradation efficiency of 92.6% within 90 min. Moreover, UCZM completely inactivated both Staphylococcus aureus and Escherichia coli within 20 min under simulated sunlight. Mechanistic studies revealed that NaGdF₄:Yb,Er played a crucial role in activating ZIF-8 and MnO₂ through Förster resonance energy transfer, facilitating the photocatalytic process. The formation of a Z-type heterojunction in UCZM promoted the efficient separation of photogenerated carriers. Furthermore, UCZM exhibited excellent biosafety properties. This study represents the first exploration of a composite material composed of UCNPs, ZIF-8, and MnO₂ for photocatalytic applications. The findings highlight the potential of this novel nanoheterojunction design, which exhibits a full spectral response, for tackling water pollution through efficient photocatalytic degradation of organic pollutants and inactivation of pathogenic bacteria.

Keywords

antibacterial / NaGdF ₄:Yb,Er@ZIF-8/MnO ₂ / nanoheterojunction / organic pollutants / photocatalysis

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