Abstract
In this study, TiO2 nanosheets are employed as a template to prepare La2Ti2O7/TiO2 (TL), which is further modified by Fe3O4 to form a ternary catalyst La2Ti2O7/TiO2/Fe3O4 (TLF). The as-synthesized composite is confirmed by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV–vis DRS spectra. According to the catalytic employment of TLF for the activation of persulfate (PS) in assistance of simulated sunlight, it is shown that TLF/PS/light system is able to degrade 93.7% tetracycline hydrochloride, giving 79.8% chemical oxygen demand (COD) removal in assistance of simulated solar light, both of which are apparently greater than that of La2Ti2O7/TiO2 and Fe3O4. The highly improved degradation efficiency can be ascribed to the fact the photo-induced electrons greatly accelerate the redox cycle of Fe(III)/Fe(II) during the PS activation. Besides, the heterojunction constructed between La2Ti2O7 and TiO2 that significantly suppresses the recombination of photo-excited carriers also contributes to the ameliorated catalytic performance.
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