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<p>Contamination of water by heavy metals poses a serious and persistent threat to both the environment and human health, thereby intensifying the demand for the development of a more precise and efficient system for detecting heavy metals. Herein, we report a facile, simple, cost-effective, and environmentally friendly method for the fabrication of ZnS quantum dots (QDs) and their application as a rapid fluorometric detection of Hg(II) in aqueous samples. The as-synthesized material is systematically characterized using different spectroscopic and microscopic techniques. XRD analysis revealed the formation of a cubic sphalerite crystal structure, whereas the FTIR spectra confirmed the presence of distinctive functional groups on the as-synthesized nanomaterial. The observed energy band gap of ~ 3.88&#xa0;eV clearly signified a pronounced blue shift compared to bulk ZnS, consistent with enhanced quantum confinement effects. The as-synthesized material exhibited excellent fluorescence sensing performance for the detection of heavy metal Hg(II) ions in aqueous media with a detection limit of 1.38&#xa0;nM, with high sensitivity and selectivity. The reported probe can be used for nanomolar-level fluorometric detection of Hg(II). Moreover, the green-synthesized ZnS QDs show promise as a low-dimensional biomaterial, exhibiting significant efficacy against selective pathogenic bacterial strains.</p> Graphical abstract <p></p>

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Marine alga-mediated facile green synthesis of highly stable antibacterial ZnS quantum dots: a selective fluorescent sensor for heavy metal ions

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Debasish Borah,
  • Puja Saikia,
  • Jayashree Rout,
  • Debika Gogoi,
  • Ankita Das,
  • Narendra Nath Ghosh,
  • Piyush Pandey,
  • Chira R. Bhattacharjee

摘要

Contamination of water by heavy metals poses a serious and persistent threat to both the environment and human health, thereby intensifying the demand for the development of a more precise and efficient system for detecting heavy metals. Herein, we report a facile, simple, cost-effective, and environmentally friendly method for the fabrication of ZnS quantum dots (QDs) and their application as a rapid fluorometric detection of Hg(II) in aqueous samples. The as-synthesized material is systematically characterized using different spectroscopic and microscopic techniques. XRD analysis revealed the formation of a cubic sphalerite crystal structure, whereas the FTIR spectra confirmed the presence of distinctive functional groups on the as-synthesized nanomaterial. The observed energy band gap of ~ 3.88 eV clearly signified a pronounced blue shift compared to bulk ZnS, consistent with enhanced quantum confinement effects. The as-synthesized material exhibited excellent fluorescence sensing performance for the detection of heavy metal Hg(II) ions in aqueous media with a detection limit of 1.38 nM, with high sensitivity and selectivity. The reported probe can be used for nanomolar-level fluorometric detection of Hg(II). Moreover, the green-synthesized ZnS QDs show promise as a low-dimensional biomaterial, exhibiting significant efficacy against selective pathogenic bacterial strains.

Graphical abstract