Efficient degradation of multi-pollutants by Zr-BiOCl/Ti3C2/Bi2Sn2O7 photocatalysts based on the synergistic impact of oxygen vacancies and Z-type heterojunction

摘要

Designing photocatalysts that efficiently degrade organic pollution in water is challenging. In this study, ZrBiOCl/Ti3C2/Bi2Sn2O7 (ZBTB) photocatalysts based on the synergistic interaction of Z -type heterojunction and oxygen vacancies (OVs) were synthesized for the first time using a hydrothermal technique. O2 chemical adsorption is facilitated by OVs, and charge transfer may be further enhanced by Ti3C2. Under visible light irradiation, ZBTB can degrade tetracycline hydrochloride (TC-HCl) by 95.5 % in 100 min, levofloxacin by 95.8 % in 100 min, and Rhodamine B by 100 % in 20 min. Finally, possible photocatalytic mechanisms were investigated experimentally and by theoretical calculations. The intermediates and possible degradation pathways were also analyzed. These results provide a rational design approach for efficient heterojunction photocatalytic removal of difficult-to-degrade pollutants from wastewater.

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