Abstract
With excellent structural characteristics of layered double hydroxides (LDHs), the high photocatalytic properties of Sn-contained LDHs were synthesized by introducing Sn with photocatalytic activity into the brucite type layers. The obtained LDHs solids were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS) and Brunauer Emmett Teller (BET) surface area analysis, confirming the crystalline phase, molecular structure, photoresponsive properties and specific surface area. Their photocatalytic activities were evaluated by degradation of 4-chlorophenol (4-CP) under visible light. The results showed that ZnSn-LDHs with skeleton structure containing Sn displayed the best decomposition efficiency of 4-CP (about 92.4% removal efficiency, 34.6 mg/g removal amount) under visible light irradiation. In addition, based on the results from gas chromatography (GC) and periodic density functional theory (DFT) analysis, the photocatalytic degradation mechanism and reaction pathway of 4-CP were investigated in detail. The data presented in this study implied that the main decomposition intermediates of 4-CP were hydro- chinone and 4-chloropyrocatechol.
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