Abstract
At present, the regulation of photocatalyst properties and highly efficient degradation of emerging contaminants are still challenging tasks. Herein, a novel core-shell composite catalyst Bi2O4 @FeOOH was fabricated by in situ depositing amorphous FeOOH nanoparticles on the outside surface of Bi2O4. A series of characterizations were conducted for the fabricated Bi2O4 @FeOOH. The photocatalytic activity of Bi2O4 @FeOOH was assessed via the degradation of tetracycline (TC) under visible irradiation. The formation of the amorphous FeOOH shell improves the visible-light harvesting capability, enlarges the specific surface area, and accelerates the transfer of the photo-induced electron. The synergistic effect of these positive factors enables the prepared Bi2O4 @FeOOH to exhibit a considerably reinforced activity and excellent stability for TC degradation. The degradation efficiency of TC on Bi2O4 @FeOOH is up to 84.2%, which is markedly higher than that over FeOOH (20.4%) and Bi2O4 (43.5%). After five reuses, the activity of Bi2O4 @FeOOH shows no obvious decrease. The degradation rate constant of TC by Bi2O4 @FeOOH is 0.01434 min−1, which is approximately 2.4 and 5.8 times those by Bi2O4 and FeOOH. This work affords a new strategy for the design of highly efficient photocatalysts that can be applied in the photocatalytic decomposition of emerging contaminants.
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