Anionic Vacancy Rich Bi-MOF Derived Ternary Biocompatible Nanocomposite For Enhanced Photocatalytic Application

Abstract

In this study, a one-step method was developed for construction of MOF derived Ag/Sr6Bi2O9- -Bi2O3 ternary photocatalyst for comprehensive water remediation applications. The synthesized ternary heterostructure exhibited a high surface area oxygen defect rich hierarchical nanostructure consisting of plasmonic Ag quantum dots (3-5 nm) embedded in ultrathinSr6Bi2O9 nanosheets that are epitaxially grafted over porous BO nanorods. The oxygen vacancies, tight heterojunction between SBO/BO and plasmonic Ag nanoparticles resulted improved optical absorption, synergic charge migration and higher lifetime of photo induced e - /h+ pairs. The enhanced opto-electronic and distinct morphological features were effectively utilized for ciprofloxacin antibiotic remediation (91%, kapp =0.0116 min-1 ) and photoinactivation of Vibrio Cholerae bacteria (96.5%). Scavenger experiments and radical trapping studies suggest S-scheme electron transfer mechanism supported by hot energetic electron injection from plasmonic Ag quantum dots which accounts for superior photocatalytic activity. This study provides a rational approach for creation of oxygen vacancy rich biocompatible hierarchical photocatalytic materials for comprehensive water remediation.