fig18

Figure 18. (A) The synthesis pathway of the multifunctional adsorbent DFCA; (b) DFCA’s fluorescence sensing capability for mercury ions in an aqueous environment, with insets showing the fluorescence quenching effect upon the introduction of mercury ions; (C) The proposed mechanism of interaction between DFCA and mercury ions; (D) The fluorescence response exhibited by DFCA in the presence of various metal ions in water; and (E) the fluorescence quenching ratio observed in the adsorbent material when exposed to different metal ions in water, accompanied by photographs of the DFCA sample in natural light and under 365 nm UV illumination, as well as images showing metal ion-treated DFCA in water under 365 nm UV light^[109]. Copyright 2023, Elsevier B.V. UV: Ultraviolet.