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

IF 6.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Analytical Chemistry Pub Date : 2025-05-17 DOI:10.1021/acs.analchem.5c00290

Qiaocheng Feng, Xiaoyan Hu, Jingru Chen, Liangqia Guo

引用次数: 0

Abstract

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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磷光萘掺杂氮化碳量子点选择性检测聚酰胺微塑料

荧光染料标记是一种检测微塑料（MPs）的直观方法。然而，在复杂的环境样品中，背景荧光的干扰导致对MP数量的高估，非特异性荧光染料不能选择性地检测单一类型的MP。本文通过尿素与1,5-二氨基萘在250℃下不完全冷凝制备了磷光萘掺杂氮化碳量子点（NDCNQDs），并通过氢键作为特异性染料对聚酰胺（PA） MPs进行染色。提出了一种选择性检测PA MPs的磷光成像方法。得益于磷光的长寿命，避免了环境样品中背景荧光的干扰。在池塘水样和池塘泥样中，PA MPs的回收率为91.2 ~ 108.4%。环境样品（如水流、沉积物、室内灰尘）中的PA MPs无需复杂的预处理即可进行分析。这项工作为环境样品中PA MPs的特异性检测提供了一种策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Analytical Chemistry 化学-分析化学

CiteScore

12.10

自引率

12.20%

发文量

1949

审稿时长

1.4 months

期刊介绍： Analytical Chemistry, a peer-reviewed research journal, focuses on disseminating new and original knowledge across all branches of analytical chemistry. Fundamental articles may explore general principles of chemical measurement science and need not directly address existing or potential analytical methodology. They can be entirely theoretical or report experimental results. Contributions may cover various phases of analytical operations, including sampling, bioanalysis, electrochemistry, mass spectrometry, microscale and nanoscale systems, environmental analysis, separations, spectroscopy, chemical reactions and selectivity, instrumentation, imaging, surface analysis, and data processing. Papers discussing known analytical methods should present a significant, original application of the method, a notable improvement, or results on an important analyte.