Insights into the effect of citric acid on the carbon dot-mediated transport of Cd²⁺ through saturated porous media

Abstract

Carbon dots (CDs) are likely to encounter heavy metal ions (i.e., Cd2+) because of their widespread application and inevitable release into the environment, where the ubiquitous low-molecular-weight organic acids (LMWOAs)...

Fluorescent Nanocarbons: From Synthesis and Structure to Cancer Imaging and Therapy

“…[ 439 ] Given the critical importance of detecting toxic heavy‐metal ions with high selectivity and sensitivity in environmental and biological samples, the reliability and feasibility of applying CDs as a fluorescent probe have been extensively explored. [ 440 ] The notable advances in this area are reflected in the vast number of papers that developed CD‐based fluorescent chemo‐sensors for highly selective and sensitive sensing of a series of metal ions, including Fe 3+ , [ 441,442 ] Hg 2+ , [ 443 ] Ca 2+ , [ 444 ] Cd 2+ , [ 445 ] Cu 2+ , [ 446 ] Au 3+ , [ 447 ] Pb 2+ , [ 448 ] Be 2+ , [ 449 ] and Cr 6+ . [ 450 ] The major driving forces that induce the fluorescence‐quenching mechanisms of CDs after conjugation with metal ions remain debated.…”