Green synthesis of boron-doped carbon dots from Chinese herbal residues for Fe3+sensing, anti-counterfeiting, and photodegradation applications
JOURNAL OF CLEANER PRODUCTION(2023)
摘要
Carbon dots (CDs), especially from biomass doped with heteroatoms, have drawn increasing attention owing to their versatility in potential applications. In this work, boron-doped CDs derived from Chinese herbal residues (B@HRCDs) were fabricated through a simple, green, one-step solvothermal method, resulting in B@HRCDs with a uniform size of 2.8 nm. The synthesized B@HRCDs were characterized using Fourier transform infrared spectroscopy, UV-visible spectroscopy, Transmission electron microscopy, X-ray photoelectron spectroscopy, and Fluorescence techniques. As prepared, the B@HRCDs demonstrated a bright fluorescence with a quantum yield of 4.0% and displayed exceptional selectivity towards Fe3+. In vitro experiments, they did not exhibit cytotoxicity against BV2 cells. The synthesized B@HRCDs were used as a sensitive nanoprobe for the detection of free Fe3+ in the range of 0-80 & mu;M with a minimum limit of detection (LOD) of 1.08 & mu;M. Based on their biocompatibility and negligible cytotoxicity, B@HRCDs were also shown to be useful for intracellular Fe3+ detection applications. When fluorescent ink was applied to bond paper, the patterns were clearly visible under UV light, indicating that B@HRCDs can be used for message encryption. Finally, it was further shown that the degradation rate of indigo carmine after 5 h of sunlight irradiation was 91% in the presence of B@HRCDs and decreased to 61% after 5 cycles, which indicates that the B@HRCDs have favorable photocatalytic activity and photostability. It is thus believed that this strategy achieves the reuse of herbal residues and proposes a low-cost, green method for the synthesis of CDs with Fe3+ sensing, anti-counterfeiting, and photodegradation functions.
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关键词
Anti-counterfeiting,Boron-doped carbon dots,Fe3+ sensing,Herbal residues reusability,Indigo carmine photodegradation
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