环境地球化学国家重点实验室知识库

High-efficient conversion of the waste biomass into eco-friendly novel bifunctional materials for selective monitoring and effective removal of mercury ions (Hg²⁺) is of great significance to achieve the environment sustainable development, but has not attracted enough attention. Herein, we exploited glutathione (GSH) assisting waste tobacco leaf as the biomass-related precursors to successfully yield a novel red fluorescence emission biomass-based carbon nanodots (CDs) with a remarkably large Stokes shift of ∼ 232 nm through one-pot hydrothermal method. Owing to the synergistic Hg-S bond and the coordination effects of the Hg²⁺ to the abundant –COOH, –NH₂ and –OH groups on the surface of CDs, this proposed biomass-based CDs showed a red fluorescence decrease response for Hg²⁺ with a high selectivity and a lower detection limit of 0.45 μM in environmental water samples. Furthermore, this binding endowed this proposed biomass-based CDs possessed a high removal efficiency of above 99.4% for Hg²⁺ as well. This work showed a novel insight into recycling the waste tobacco leaf into novel, economic, efficient, reliable, and eco-friendly biomass-based CDs for simultaneously precise traceability and high-efficient removal of Hg²⁺ pollution in environmental matrices.