Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (3): 623-628.doi: 10.1007/s40242-021-1028-3

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Carbon Dots Derived from Coffee Residue for Sensitive and Selective Detection of Picric Acid and Iron(III) Ions

ZONG Siyu, WANG Bolun, MA Wenyan, YAN Yan, LI Jiyang   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2021-01-20 Revised:2021-03-10 Online:2021-06-01 Published:2021-05-31
  • Contact: YAN Yan, LI Jiyang E-mail:yanyan@jlu.edu.cn;lijiyang@jlu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(No. 21671075).

Abstract: Afacile method was developed to prepare carbon dots(CDs) by pyrolysis and etching of coffee residue. The as-prepared CDs show uniform spherical nanoparticles with an average size of 2.3 nm and exhibit excitation-dependent fluorescence emissions. Moreover, CDs also exhibit strong fluorescence quenching to nitro compounds and metal ions in both water and ethanol solutions, which could act as a platform for dual detection of PA(picric acid) and Fe3+ ions with low detection limits of 0.26 and 0.83 μmol/L, respectively. This work provides a novel method for preparation of environmental-friendly fluorescent CDs and shows their potential applications in photoluminescence sensors.

Key words: Carbon dot, Coffee residue, Luminescence, Detection