Synthesis of MIL-101(Cr) metal-organic framework material and research photocatalytic capability of material for nitrate removal in water

This paper presents the research results on some characteristics of the metal-organic framework material MIL-101(Cr) and its ability to remove nitrate from aqueous environments based on photocatalytic reactions. This material was synthesized using the hydrothermal method in the laboratory. Techniques such as FE-SEM, XRD, FT-IR, and BET were employed, demonstrating that the porous structure of the material is highly developed, with a specific surface area of up to 3017 m²/g and characteristic octahedral crystal size ranging from approximately 100 to 300 nm. Experimental results show that under UV light conditions at a wavelength of 365 nm and a power of 250 W, the MOF MIL-101(Cr) can catalyze nitrate removal under UV light, achieving a maximum removal efficiency of up to 99% after 180 minutes of reaction. The nitrate removal efficiency of MIL-101 is significantly improved, and reaches nearly 100% within a reaction time of 40 minutes when formic acid (HCOOH 46 mM) is used as a hole scavenger.