Abstract
In this report, we focus on the modification of iron terephthalate metal–organic framework (MIL-53(Fe)) by soaking in H2O2 solution and its mechanism. The structure of MIL-53(Fe) before and after the modification were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and N2 adsorption–desorption isotherms. The XRD results showed that the material structure changed to amorphous phases and the photocatalytic efficiency was improved after modified by H2O2. The MIL-53 (Fe, H2O2) nanoparticles about 100–300 nm in size was successfully prepared and confirmed by SEM images. In term of UV–Vis DRS results, the absorption spectrum of modified MIL-53(Fe) shifted to higher wavelength and its band gap energy is estimated about 2.2 eV, which is significantly lower than the bandgap value of the conventional material. The impact of the modification on the photocatalytic efficiency was investigated by methylene blue (MB) degradation experiments and photoluminescence (PL) spectroscopy. MB was completely decomposed within 30 min by modified MIL-53(Fe) under optimal conditions. The reaction parameters that affect MB degradation by the as-prepared catalyst were also investigated, including the pH solution, catalyst and H2O2 dosage.
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