Greatly boosting sunlight-driven photocatalytic performance of metal-organic-framework by coupling with Ag2S nanoparticles
Metal organic frameworks (MOFs), a novel type of porous crystal materials, display unique structure and features, such as versatile and modular frameworks, the ligand-to-metal charge transfer transitions, and unusual adsorptive capability for target molecules. MOFs materials have been demonstrated potential for various applications, particularly photocatalysis in recent years. Nevertheless, their photocatalytic performances are still unsatisfied due to their rapid recombination of charge carriers. In this work, a facile method was successfully developed to tremendously boost sunlight-driven photocatalytic performance of a MOFs material (MIL-53(Fe)) by coupling with silver sulfide (Ag2S) nanoparticles for the first time. The prepared catalysts were characterized in detail. Their photocatalytic and photo-Fenton catalytic performances were assessed via degradation of tetracycline (TC) and rhodamine B (RhB). The results indicates that the fabricated Ag2S/MIL-53(Fe) heterojunction composites exhibit much enhanced photocatalytic activities compared with bare MIL-53(Fe) and Ag2S. The greatly enhanced catalytic activity can be ascribed to the formation heterojunction with intimate interface contact which promote the transfer and separation for charge carriers, decrease band gap, increase light absorption, and increase the specific surface area. Moreover, the addition of H2O2 can further enhance the degradation efficiency due to the synergistic effects of photo and Fenton catalysis. This work provides a new insight into development of facile method to highly improve photocatalytic performance of MOFs materials for environmental remediation.