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Phosphorescent Naphthalene-Doped Carbon Nitride Quantum Dots for Selective Detection of Polyamide Microplastics

Analytical Chemistry 2025 7 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 53 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Qiaocheng Feng, Xiao Hu Qiaocheng Feng, Qiaocheng Feng, Qiaocheng Feng, Qiaocheng Feng, Xiao Hu Qiaocheng Feng, Jingru Chen, Xiao Hu Xiao Hu Qiaocheng Feng, Jingru Chen, Jingru Chen, Liangqia Guo, Qiaocheng Feng, Liangqia Guo, Liangqia Guo, Liangqia Guo, Xiao Hu Liangqia Guo, Liangqia Guo, Xiao Hu

Summary

Researchers created phosphorescent quantum dots that specifically bind to polyamide microplastics through hydrogen bonding and used them to develop a selective detection method. Because phosphorescence has a longer lifetime than fluorescence, the technique avoids interference from background fluorescence in environmental samples. The method achieved 91-108% recovery rates in pond water and mud samples, enabling detection of polyamide microplastics without complex pretreatment.

Polymers

Study Type Environmental

Fluorescent dye labeling is a visual method for the detection of microplastics (MPs). However, the interference from the background fluorescence in complex environmental samples results in overestimation of the MP number, and the nonspecific fluorescent dye cannot selectively detect a single type of MPs. Herein, phosphorescent naphthalene-doped carbon nitride quantum dots (NDCNQDs) were prepared via incomplete condensation of urea with 1,5-diaminonaphthalene at 250 °C and used as a specific dye to stain polyamide (PA) MPs via hydrogen bonding. A phosphorescence imaging method for the selective detection of PA MPs was proposed. Benefitting from the long lifetime of phosphorescence, the interference from the background fluorescence in environmental samples was avoided. The recoveries for PA MPs in pond water samples and pond mud samples were 91.2-108.4%. PA MPs in environmental samples (e.g., streamwater, sediment, house dust) were analyzed without complicated pretreatment. This work provides a strategy for the specific detection of PA MPs in environmental samples.

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