Fabrication of Modified Metal Organic Framework Photocatalysts and Water Treatment Efficiency

Abstract:

A simple multistage stirring methods was utilized to modifications of Metal organic framework （MOF） catalyst （MIL-100（Fe）） （incorporation of AgCl）. Characterization techniques such as X-ray diffraction （XRD） and Fourier-transform infrared spectroscopy （FT-IR） were employed to confirm the successful preparation of the novel heterojunction material （AgCl/MIL-100（Fe））. Sulfamethazine （SMZ） was chosen as the targeted contaminant. The removal efficiency of SMZ by the photocatalyst was investigated， considering factors such as catalyst dosage， pollutant concentration， and pH. Furthermore， an initial exploration of the degradation mechanism and pathway of SMZ was conducted. The results demonstrated that the rational construction of the heterojunction effectively harnesses photo-electrons （e^-） and holes （h⁺）， accelerating the transfer of charge carriers at the interface， thereby enhancing the photocatalytic performance of the material. When pH = 7， catalyst dosage was 0.5 g·L^-1， reaction time was 1.5 h， the removal rate of 99.9% for an initial SMZ concentration of 1.0 mg·L^-1. During the photocatalytic degradation of SMZ， superoxide radicals （?O₂^-）， hydroxyl radicals （?OH）， and h⁺ play dominant roles， involving three main ways： oxidation， hydroxylation， and denitrification.

Key words:water treatment;photocatalytic oxidation;Metal organic framework;degradation