MOF Derived Hierarchical Ternary Heterostructure Towards Micro- Pollutant Degradation and Antibacterial Inactivation

Abstract

In this study, we have reported a one step protocol for the fabrication of MOF (Metal Organic Framework) derived Sr6Bi2O9--Bi2O3 (SBO-BO) binary heterostructure which is further decorated by plasmonic silver nanoparticles to prepare a ternary composite Ag/Sr6Bi2O9-- Bi2O3 (Ag/SBO-BO). The synthesized MOF derived ternary heterostructure has been extensively characterized by using various analytical techniques such as powder XRD, XPS, UV-DRS, Raman, FTIR, FESEM, TEM, BET. The X-ray diffraction pattern and morphological investigations suggest formation of hierarchical nanocuboidal heterojunction between the Sr6Bi2O9 and -Bi2O3 phases. The UV-DRS plot and XPS studies reveals the presence of oxygen vacancy. The Ag/SBO-BO ternary composite exhibit high surface area, higher excited state lifetime of electrons and hole pairs and enhanced solar light absorption. These properties of Ag/SBO-BO are exploited for the antibiotic(Ciprofloxacin) photodegradation in aqueous sources and antibacterial activity (V. Cholera). Radical trapping experiments and ESR studies suggest the prevalence of S-scheme charge transfer mechanism which is supported by plasmonic Ag nanoparticles on the surface of SBO-BO binary heterostructure. This study accounts for the higher Ciprofloxacin drug degradation of 96% and significant antibacterial activity after 40 mins of light irradiation.