摘要:
To improve the efficiency of TiO<sub>2</sub> as a photocatalyst for contaminant degradation, a novel nanocomposite catalyst of (N, Fe) modified TiO<sub>2</sub> nanoparticles loaded on bentonite (B-N/Fe-TiO<sub>2</sub>) was successfully prepared for the first time by sol-gel method. The synthesized B-N/Fe-TiO<sub>2</sub> catalyst composites were characterized by multiple techniques, including scanning electron microscope (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), X-ray fluorescence (XRF), nitrogen adsorption/desorption, UV-Vis diffuse reflectance spectra (DRS), and electron paramagnetic resonance (EPR). The results showed that bentonite significantly enhanced the dispersion of TiO<sub>2</sub> nanoparticles and increased the specific surface area of the catalysts. Compared with nondoped TiO<sub>2</sub>, single element doped TiO<sub>2</sub>, or unloaded TiO<sub>2</sub> nanoparticles, B-N/Fe-TiO<sub>2</sub> had the highest absorption in UV-visible region. The photocatalytic activity of B-N/Fe-TiO<sub>2</sub> was also the highest, based on the degradation of methyl blue (MB) at room temperature under UV and visible light irradiation. In particular, the synthesized B-N/Fe-TiO<sub>2</sub> showed much greater photocatalytic efficiency than N/Fe-TiO<sub>2</sub> under visible light, the newly synthesized B-N/Fe-TiO<sub>2</sub> is going to significantly increase the photocatalytic efficiency of the catalyst using sun light.
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