Abstract
Inspired by the high sustainability, energy saving, cleanliness of photocatalysis (PC) with respect to antibiotics decomposition, we developed a stable, highly efficient Bi2Ti2O7@Bi2S3/polyurethane (BTO@Bi2S3/PU) photocatalytic system. It exhibited the best degradation performance with the removal of 82.08 % oxytetracycline (OTC) within 180 min under the optimal reaction parameters. Systematic characterization of BTO@Bi2S3/PU revealed its wider light-harvest capacity, higher electron–hole (e−–h+) separation efficiency, lower interface resistance, and better redox potential in heterojunction. Based on electrochemical characterization and density functional theory calculation, the construction of Z-scheme BTO@Bi2S3 photocatalyst substantially optimized the band structure. Moreover, the redox cycles of Bi3+/Bi5+ and Ti4+/Ti3+ further enhanced the charge transfer rate during the photoactivation process. For the OTC photodegradation pathways, ·OH, h+, ·O2−, and 1O2 dominated the pollutant decomposition and the toxicity of intermediates were decreased. Overall, the BTO@Bi2S3/PU photocatalytic system may provide a universal and stable technique for advanced photoheterojunction applications and wastewater purification.
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