Abstract
A novel Bi0–Bi4Ti3O12/Ag2CO3 composite photocatalyst with Z-type heterojunction was successfully synthesized. The best degradation rate of Bi0–Bi4Ti3O12/Ag2CO3 for tetracycline hydrochloride (TC) can reach 89.03% under the optimized reaction conditions and its reaction rate constant was 0.01517 min−1, 2.89 times that of pure Bi4Ti3O12. In addition, the catalyst showed a good universality to the other three antibiotics. The results of catalyst characterization showed that the enhanced photocatalytic activity of Bi0–Bi4Ti3O12/Ag2CO3 was mainly due to the surface plasmon resonance (SPR) effect of reduction of Bi3+ and the formation of heterojunction between Bi0–Bi4Ti3O12 and Ag2CO3. Active species capture experiments and electron paramagnetic resonance (EPR) results showed that •O2‾ and h+ played a major role in the reaction process. The degradation pathway of TC by Bi0–Bi4Ti3O12/Ag2CO3 was analyzed by Liquid Chromatography-Mass Spectrometry (LC-MS). Moreover, a possible electron transfer mechanism of Z-type heterojunction was deduced.
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