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Metal–Organic Framework-Derived Hierarchical Ag/Sr 6 Bi 2 O 9 -α-Bi 2 O 3 Ternary Photocatalyst for Micropollutant Remediation and Bacterial Photoinactivation

2024; American Chemical Society; Volume: 2; Issue: 1 Linguagem: Inglês

10.1021/acsaenm.3c00710

2771-9545

Swagat Kumar Nayak, Priyanka Dash, Ranjit Bariki, Sibun Kumar Pradhan, Saumyaranjan Panda, Bismita Nayak, Braja Gopal Mishra,

Perovskite Materials and Applications

In this work, a hierarchical Ag/Sr6Bi2O9-α-Bi2O3 (Ag/SBO-BO) ternary heterostructure photocatalyst was fabricated by an MOF-derived route and studied for aqueous-phase micropollutant remediation and inactivation of water pathogens. The as-synthesized Ag/Sr6Bi2O9-α-Bi2O3 composite inherited the cuboidal-rod shape morphology of the pristine Bi-MOF with an internal hollow structure. The Ag nanodots (3–5 nm) were preferentially decorated over the planar surface of high-aspect-ratio Sr6Bi2O9 nanosheets, which were epitaxially grown over the porous Bi2O3 (BO)-microrods. The Ag/SBO-BO composite displayed important structural attributes including anionic vacancies and formation of a tight heterojunction between Sr6Bi2O9/Bi2O3 (SBO-BO) phases, which endowed superior optical absorption, synergistic charge channelization, and higher photoexcited state lifetimes. The improved optoelectronic features of Ag/Sr6Bi2O9-α-Bi2O3 were successfully exploited for enhanced photocatalytic antibiotic degradation (ciprofloxacin, k = 0.0116 min–1), heavy-metal reduction (Cr6+, k = 0.0752 min–1), and inactivation of water pathogens (Vibrio cholerae, 96.5% in 40 min). The biocompatible nature of the ternary heterostructure was also ascertained from a hemagglutination study. An S-scheme charge transfer mechanism promoted by plasmonic hot electron injection from Ag nanodots coupled with a robust •OH radical generation ability accounted for the observed photocatalytic and photoantibacterial activity of the ternary composite.