Influence of zeolite carriers on the dyes degradation for framework Fe-doped zeolite catalysts

Fe-doped zeolites with Mobil Five (MFI) structure have been widely used as heterogeneous Fenton catalysts to eliminate dyes from wastewater. However, the influence of carriers on degradation efficiency has not been reported yet. In this work, we have prepared three Fe-doped zeolite catalysts, FeS-1, FeZSM-5, and FeTS-1, with silicalite-1 (S-1), zeolite socony mobil-5 (ZSM-5), and titanium silicalite-1 (TS-1) as carriers, respectively. Characterizations, such as X-ray diffraction (XRD), scanning electron microscopy, energy-disperse X-ray spectroscopy, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflection spectroscopy (UV–Vis DRS), X-ray fluorescence spectrometer, zeta potential, and N 2 adsorption/desorption isotherms, were used to investigate the morphologies and physicochemical properties of the synthesized materials. The catalytic performances of all zeolite catalysts were evaluated in the degradation experiments. The results depicted that the degradation efficiency of FeZSM-5 was higher than that of FeS-1 and FeTS-1 owing to its higher hydrophilic property, larger external specific surface area, and more negative zeta potential value. Therefore, the ZSM-5 could be a more suitable solid matrix for heterogeneous Fenton reactions than S-1 and TS-1.