科研之友
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摘要
Developing a water-soluble supramolecular system for the detection and removal of Hg2+ is extremely needed but remains challenging. Herein, we reported the facile construction of a fluorescent supramolecular system (H superset of G) in 100% water through the self-assembly of carboxylatopillar[5]arene sodium salts (H) and diketopyrrolopyrrole-bridged bis(quaternary ammonium) guest (G) by host-guest interaction. With the addition of Hg2+, the fluorescence of H superset of G could be efficiently quenched. Since Hg2+ showed synergistic interactions (coordination and Hg2+- cavity interactions with G and H, respectively), crosslinked networks of H superset of G@Hg2+ were formed. A sensitive response to Hg2+ with excellent selectivity and a low limit of detection (LOD) of 7.17 x 10(-7) M was obtained. Significantly, the quenching fluorescence of H superset of G@Hg2+ can be recovered after a simple treatment with Na2S. The reusability of H superset of G for the detection of Hg2+ ions was retained for four cycles, indicating the H superset of G could be efficiently used in a reversible manner. In addition, the H superset of G could efficiently detect Hg2+ concentration in real samples (tap water and lake water). The developed supramolecular system in 100% water provides great potential in the treatment of Hg2+ detection and removal for environmental sustainability.
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单位广东省农业科学院
