Fluorometric determination of mercury(II) based on dual-emission metal-organic frameworks incorporating carbon dots and
- PDF / 3,681,534 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 97 Downloads / 300 Views
ORIGINAL PAPER
Fluorometric determination of mercury(II) based on dual-emission metal-organic frameworks incorporating carbon dots and gold nanoclusters Manli Guo 1 & Jingtian Chi 1 & Yijing Li 2 & Geoffrey I. N. Waterhouse 2,3 & Shiyun Ai 2 & Juying Hou 2
&
Xiangyang Li 1
Received: 21 November 2019 / Accepted: 18 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Carbon dots and gold nanoclusters co-encapsulated by zeolitic imidazolate framework-8 (CDs/AuNCs@ZIF-8) have been obtained at room temperature. The composite has been applied to the ratiometric fluorescence determination of mercury(II). The composite shows fluorescence emission maxima at 440 and 640 nm under 360 nm excitation, due to the CDs and AuNCs, respectively (associated quantum yields were 18% and 17%, respectively). In the presence of Hg2+, the fluorescence at about 640 nm is quenched, while the fluorescence at about 440 nm is unaffected. The CDs/AuNCs@ZIF-8 composite allows the sensitive detection of Hg2+, with the fluorescence intensity ratio (I640/I440) decreasing linearly with Hg2+ concentration over the range 3–30 nM. The fluorescence emission of the composite changes color from red to blue with increasing Hg2+ under UV excitation, which can easily be discerned visually. This visual detection of Hg2+ is due to the high fluorescence quantum yields of the CDs and AuNCs and the ~ 200 nm separation between the two emission maxima. Keywords Zeolitic imidazolate framework-8 . Carbon quantum dots . Fluorescent metal nanoclusters . Ratiometric fluorescence nanoprobe . Hg(II) ions . Dual-emission nanocomposites . Visual determination . Fluorescence quenching . Water samples . Quantum yields
Introduction Mercury(II) ions are toxic to humans and many other living organisms. Accordingly, the monitoring of Hg2+ in waterways and foods is vital in environmental protection, food safety, and
Manli Guo and Jingtian Chi are co-first authors. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04508-z) contains supplementary material, which is available to authorized users. * Juying Hou [email protected] * Xiangyang Li [email protected] 1
College of Food Science and Engineering, Shandong Agricultural University, Taian 271018, Shandong, People’s Republic of China
2
College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, Shandong, People’s Republic of China
3
School of Chemical Sciences, The University of Auckland, Auckland 1142, New Zealand
human health. Many traditional methods used for Hg2+ detection and quantification, such as inductively coupled plasma mass spectrometry (ICP-MS) or spectrophotometric assay, suffer from limitations such as sophisticated instrumentation or complicated sample preparation, respectively [1–4]. Fluorescence-based assays for Hg2+ offer numerous advantages for Hg2+ quantification owing to their low limits of detection, fast analysis times, and low equipment capital costs. Particularly promising are
Data Loading...
