PREPARATION AND PHOTOCATAILTIC PROPERTIES OF MOFS-DERIVED POROUS TiO2/C AND N-DOPED Fe2O3 COMPOSITES
TiO2 was added to NH2-MIL-101(Fe)precursor,and TiO2/NH2-MIL-101(Fe)was prepared by solvothermal method.TiO2/C、N-doped Fe2O3 composites(TiO2/C、N-Fe2O3)were further obtained by high-temperature heat treatment.The crystal structure,morphology,composition and spectral characteristics of the obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),photoelectron spectroscopy(XPS),UV-Vis diffuse reflection(UV-vis DRS)and fluorescence spectroscopy(PL).The photocatalytic activity of Rhodamine B(RhB)was evaluated by degradation of RhB solution under simulated sunlight irradiation.The results show that the band gap width of TiO2 doped with C and N in Fe2O3 decreases after TiO2 mixed with C and N doped with Fe2O3.After 2.5 h of simulated sunlight irradiation,the removal rate of 10 mg/L RhB reaches 95%under the photocatalytic action of 0.1 g/LTiO2/C、N-Fe2O3 composite.The rate is 0.0192 min-1,and the effect is significantly higher than that of TiO2 and C,N-Fe2O3.The composite material has good stability and can be used repeatedly.The band gap is shortened mainly through the composite of porous C and N-doped Fe2O3 and TiO2 derived from MOFs,and the separation of holes and electrons is strengthened,thus the visible light catalytic activity is improved.
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