Rosmarinic Acid-Capped Silver Nanoparticles for Colorimetric Detection of CN^- and Redox-Modulated Surface Reaction-Aided Detection of Cr(VI) in Water.

ABSTRACT: Rosmarinic acid-capped silver nanoparticles (Ro-AgNPs) were prepared and applied as a probe for selective colorimetric detection of cyanide (CN^-) and chromium(VI) [Cr(VI)] under different conditions in aqueous media. The carbon atom of CN^- interacts with the AgNPs, and the carbon atom donates electrons from the HOMO to the vacant orbitals of the coordinatively unsaturated surface atom (Ag⁰). After donating electrons, CN^- attached onto the surface of the nanoparticles becomes very reactive and interacts with dissolved oxygen and generates reactive oxygen species (ROS) such as superoxide (O₂ ^-), singlet oxygen (¹O₂), and so forth. In this process, Ag⁰ oxidizes to Ag⁺ and combines wit

SUBMITTER: Bhatt S 

PROVIDER: S-EPMC8757454 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature