Abstract
Mercury ion(Hg2+),as one of the most toxic heavy metal ions,accumulates easily in the environment,which can generate potential hazards to the ecosystem and human health.To effectively detect and re-move Hg2+,we fabricated four types of carbon dots(CDs)using carboxymethyl nanocellulose as a carbon source doped with different elements using a hydrothermal method.All the CDs exhibited a strong fluo-rescence emission,excitation-dependent emission and possessed good water dispersibility.Moreover,the four fluorescent CDs were used for Hg2+recognition in aqueous solution,where the CDs-N exhibited better sensitivity and selectivity for Hg2+detection,with a low limit of detection of 8.29×10-6 mol/L.It was determined that the fluorescence quenching could be ascribed to a photoinduced charge-transfer processes between Hg2+and the CDs.In addition,the CDs-N were used as a smart invisible ink for anti-counterfeiting,information encryption and decryption.Furthermore,the CDs-N were immersed into a cellulose(CMC)-based hydrogel network to prepare fluorescent hydrogels capable of simultaneously de-tecting and adsorbing Hg2+.We anticipate that this research will open possibilities for a green method to synthesize fluorescent CDs for metal ion detection and fluorescent ink production.
基金项目
National Natural Science Foundation of China(52370110)
National Natural Science Foundation of China(21607044)
Fundamental Research Funds for the Central Universities(2023MS146)
Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University for support(2020ZD01)
Open Research Fund of the School of Chemistry and Chemical Engineering,Henan Normal University for support(2021YB07)
Royal Society for a Wolfson Research Merit Award()
维普
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