Effect of metal–ligand ratio on the rhodamine B photodegradation activity of metal-organic framework materials based on bismuth and trimesic acid

Trinh Nguyen Duy, Vinh Nguyen Huu, Le Pham Hoang Ai, Trang Pham Quynh, Huy Tran Huu, Quang Tran Huu, Tuyen Nguyen Van

Abstract


In this study, the photocatalytic degradation of rhodamine b (RhB) is investigated over metal-organic framework materials based on bismuth and trimesic acid (Bi-BTC) with different metal-to-ligand molar ratios. All obtained products are characterized by using powder X-ray diffraction, scanning electron microscopy, and UV–vis diffuse reflectance spectroscopy. It is found that decreasing the metal-to-ligand ratio below 1:1 produces high crystallinity and long rod-like crystals of Bi-BTC. For the metal-to-ligand molar ratios 5:1 and 1:1, we obtain low crystallinity of Bi-BTC. Additionally, a lower metal-to-ligand ratio in the Bi-BTC photocatalyst leads to the higher efficiency compared to other Bi-BTC photocatalysts. The metal-to-ligand ratio of 1:20 (Bi-BTC-0.05) favors the highest efficiency, in which 97.81% rhodamine B (RhB) is removed after 150 min of irradiation. The results should open a new approach to optimize the desired Bi-BTC structure for a target application.


Keywords


Metal-organic framework; Metal–ligand ratio; Rhodamine b photodegradation

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DOI: https://doi.org/10.51316/jca.2022.033

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