Synthesis of acetic acid-modulated NH2-MIL-101(Fe) for advanced oxidation of rhodamine B from aqueous solution

A novel composite of acetic acid-modulated AC-NH2-MIL-101(Fe) was prepared by mild chemistry. The catalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), Brunaure-Emmett-Teller (BET) and X-ray photoelectron spectroscopy (XPS). Acetic acid can control the crystal size, so that the catalyst had a large specific surface area (99.35 m2·g−1) and pore size (0.13 cm3·g−1), the adsorption amount of Rhodamine B (RhB) up to 446.965 mg·g−1, after the addition of peroxydisulfate (PDS), the catalytic degradation efficiency of RhB was as high as 99.7%. Electronic paramagnetic resonance spectrometer (EPR) and quenching experiments showed that the catalytic process may involve radical (·OH, SO4-· and O2·-) and non-radical (1O2) processes, in which the contribution of 1O2 to degradation reached 63.55% and played a major role.