水溶性煤基发光碳点的室温快速合成及其在Fe3+离子检测中的应用

A highly efficient, rapid, room temperature synthesis method for coal-based water-soluble fluorescent carbon dots and its use in Fe3+ ion detection

    摘要
  • 摘要: 碳量子点具有优异的光学性质，良好的水溶性、低毒性、原料来源广、成本低、生物相容性好等诸多优点，广泛应用于发光器件、生物检测、能源存储与转换领域，但在实际应用中还存在合成过程复杂、产率低等挑战。本文以煤为原料，以甲酸和双氧水为氧化剂，在室温下可大量合成煤基发光碳点，考查了氧化剂的添加量、反应时间对煤基发光碳点的产率及反光性质的影响，结果表明煤基发光碳点产率高达54%，且具有良好的水溶性、光稳定性、耐盐性和较高的发光量子效率。制备的煤基发光碳点可用于Fe3+离子的特异性检测，检测限低于600 n mol L−1。该合成方法为煤的高附加值利用和设计开发煤基新材料提供了新途径。

     

    Abstract: We report a method for the of coal-based fluorescent carbon dots (CDs) at room temperature using a mixture of hydrogen peroxide (H2O2) and formic acid (HCOOH) as the oxidant instead of concentrated HNO3 or H2SO4. The CDs have an excitation dependent behavior with a high quantum yield (QY) of approximately 7.2%. The CDs are water soluble and have excellent photo-stability, good resistance to salt solutions, and are insensitive to pH in a range of 2.0-12.0. The CDs were used as a very sensitive probe for the turn-off sensing of Fe3+ ion with a detection limit as low as 600 nmol/L and a detection range from 2 to 100 μmol/L. This work provides a way for the high value-added utilization of coal.

     

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