posted on 2024-01-19, 13:08authored byYao-Xiao Zhao, Yu-Long Li, Wei-Xing Chen, Xi-Lang Jin
The
development of efficient fluorescent probes and adsorbents
for detecting and removing Cu2+, which pose potential environmental
and health risks, is a highly active area of research. However, achieving
simultaneously improved fluorescence detection efficiency and enhanced
adsorption capacity in a single porous probe remains a significant
challenge. In this study, we successfully synthesized a two-dimensional
imine-based TAP-COF using 2,4,6-triformylphloroglucinol and tri(4-aminophenyl)amine
as raw materials. TAP-COF exhibited excellent properties, including
a large specific surface area of 685.65 m2·g–1, exceptional thermal stability (>440 °C), chemical stability,
temporal stability, and recyclability. Fluorescence testing revealed
that TAP-COF exhibited remarkable specificity and high sensitivity
for detecting Cu2+. The fluorescence mechanism, in which
the excited state intramolecular proton transfer was impeded by the
interaction of Cu2+ with CO and C–N bonds
on TAP-COF upon the addition of Cu2+, was further elucidated
through experimental and theoretical methods. Furthermore, the adsorption
capacity of TAP-COF toward Cu2+ was investigated, confirming
the excellence of TAP-COF as a fluorescent probe and adsorbent for
the specific detection and removal of Cu2+. This work holds
significant implications for improving environmental and human health
concerns associated with Cu2+ contamination.