Functionalization of cellulose carbon dots with different elements (N, B and S) for mercury ion detection and anti-counterfeit applications

Xiaoning Li, Quanyu Shi, Meng Li, Ningxin Song, Yumeng Xiao, Huining Xiao, Tony D. James, Lei Feng

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)

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 remove 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 fluorescence 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 detecting 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.

Original languageEnglish
Article number109021
JournalChinese Chemical Letters
Volume35
Issue number7
Early online date2 Sept 2023
DOIs
Publication statusE-pub ahead of print - 2 Sept 2023

Keywords

  • Anti-counterfeiting
  • Carbon dots
  • Functional groups
  • Hg detection
  • Mechanism

ASJC Scopus subject areas

  • Chemistry(all)

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