Nghiên cứu khả năng quang xúc tác phân hủy Rhodamine B của vật liệu Zeolitic imidazolate frameworks-8 (ZIF-8)

The persistent environmental pollution caused by organic dyes, such as Rhodamine B originating from industries like textiles, necessitates the development of effective and sustainable remediation strategies. These recalcitrant pollutants pose severe threats to aquatic ecosystems and human health, highlighting the urgent need for advanced treatment technologies. Photocatalysis, recognized for its high efficiency, cost-effectiveness, and environmentally benign nature, offers a compelling solution for the degradation of organic pollutants. Metal Organic Frameworks (MOFs), particularly Zeolitic imidazolate frameworks-8 (ZIF-8) with their remarkable porosity, structural flexibility, and thermal stability, emerge as highly promising candidates for photocatalytic applications. This research focuses on exploring the potential of ZIF-8 as a photocatalyst for the efficient degradation of Rhodamine B under UV light, aiming to address critical challenges in industrial wastewater treatment.

Researchers, engineers, and scientists specializing in material chemistry, environmental engineering, wastewater treatment, and photocatalysis, particularly those interested in Metal Organic Frameworks and their applications.

This study successfully synthesized Zeolitic imidazolate frameworks-8 (ZIF-8) nanocrystals using a straightforward hydrothermal method and investigated their efficacy as a photocatalyst for the degradation of Rhodamine B (RhB) dye. Characterization techniques, including X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET) analysis, confirmed the formation of highly crystalline, uniform rhombic dodecahedron ZIF-8 nanocrystals with a significant surface area of 1036 m² g⁻¹. The photocatalytic degradation experiments demonstrated that ZIF-8 achieved an impressive 92.2% removal of RhB within just 30 minutes under UV irradiation. This performance was nearly three times higher than that of commercial TiO2 (30.9% degradation), highlighting the superior catalytic activity of ZIF-8. Furthermore, the material exhibited exceptional photostability and reusability, maintaining its high degradation efficiency over five consecutive cycles, as evidenced by consistent XRD patterns and SEM images before and after photocatalysis. The photocatalytic mechanism involves the generation of reactive species, such as hydroxyl radicals, which effectively break down the dye molecules. These findings underscore ZIF-8's potential as a highly promising, stable, and reusable photocatalyst, offering an effective and environmentally friendly approach for treating persistent organic dye pollutants in industrial wastewater, particularly within the textile industry.