Facile fabrication of Sc-BiOBr photocatalyst immobilized on palm bark with enhanced visible light photocatalytic performance for estradiol degradation

摘要

A novel Sc-BiOBr photocatalyst was innovatively prepared via the dispersion of Sc-BiOBr onto the surface of palm bark with the utilization of 1-methyl imidazoliurn chloride ionic liquid as the solvent. The crystalline phase, morphology, chemical composition and optical property of the photocatalyst were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) attached with energy dispersive spectrometer (EDS), transmittance electron microscopy (TEM), Fourier transform infrared (FT-IR) spectrometry, Brunauer-Emmett-Teller (BET) surface area, photoluminescence (PL) spectra and UV-vis diffuse reflectance spectroscopy (DRS). Photocatalytic activity was evaluated by the photodegradation of estradiol. The photodegradation rate of estradiol over Sc-BiOBr/palm bark photocatalyst was 99.9% under visible light irradiation, which exhibited excellent photocatalytic efficiency than pure BiOBr. The kinetics of estradiol photodegradation catalyzed by Sc-BiOBr/palm bark photocatalyst was investigated by fitting the data with the data with pseudo-first-order model. The apparent rate constant of Sc-BiOBr/palm bark photocatalyst was 1.88 and 1.27 times higher than that of pure BiOBr and Sc-BiOBr. Meanwhile, the effect of photocatalyst loading and initial estradiol concentration was also investigated. The recycling experiments revealed that the Sc-BiOBr/palm bark photocatalyst still exhibited excellent photocatalytic activity after five recycling runs. The radical quenching experiments verified that center dot O-2(-) and h(+) were the dominant reactive species.