Facile construction of Z-scheme AgCl/Bi3TaO7 photocatalysts for effective removal of tetracycline under visible-light irradiation

Abstract

A string of AgCl/Bi 3 TaO 7 two-component composite was synthesized by hydrothermal and depositionprecipitation process initially. The photocatalytic activities of mixed-phase AgCl/Bi 3 TaO 7 were evaluated toward the decomposition of tetracycline (TC). Among these as-prepared materials, AgCl/Bi 3 TaO 7 nanocomposites when the molar ratio of baked materials between AgCl and Bi 3 TaO 7 was 1:5 presented the optimal photocatalytic quantum e ciency for TC dissociation (86.82%) with visible light exposure, which was 1.69 and 2.38 folders than that of single Bi 3 TaO 7 and AgCl, respectively. What's more, it illustrated that the photogenerated carriers were markedly isolated on account of the formation of heterojunction con rmed by EIS analysis. Meanwhile, radical trapping experiments implied that the photo-induced holes (h + ), hydroxyl radical (•OH) and superoxide radical (•O-2) were the major active species. The escalated photocatalytic activity could be ascribed to the unique construction of Z-scheme AgCl/Bi 3 TaO 7 heterojunction, which could expedite charge separation and transmission, cement light absorption capability and retain the strong redox ability of photogenerated electrons and holes. Our nding suggests that AgCl/Bi 3 TaO 7 nanocomposites possess great potential for photocatalytic oxidation of residual TC in the wastewater e uents and the reported strategy can contribute to the development of novel high-performance photocatalyst.

Construction of Z-scheme AgCl/BiOCl heterojunction with oxygen vacancies for improved pollutant degradation and bacterial inactivation

“…34,35 To solve these problems, the strategy of heterojunction construction is usually adopted. For example, Guo 36 and co-workers successfully synthesized a AgCl/Bi 3 TaO 7 heterojunction by a hydrothermal and deposition-precipitation process, which showed excellent photocatalytic efficiency toward TC. Liu 37 and coworkers successfully prepared a AgCl/Ag/MnTiO 3 construction with improved photocatalytic efficiency.…”