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Sensitive detection of 2,4,6-trinitrotoluene utilizing fluorescent sensor from carbon dots and reusable magnetic core-shell nanomaterial.
- Source :
-
Talanta . Oct2021, Vol. 233, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Carbon dots have been a promising nano-carbon material with many advantages, and attracted many more attentions. This study designed a new chemosensor integrating the strong fluorescent property of carbon dots and the magnetism of amino-functionalized magnetic core-shell nanomaterial, Fe@SiO 2 –NH 2 for determination of 2,4,6-trinitrotoluene (TNT). In this system, fluorescent carbon dots interacted with amino groups on the surface of amino-functionalized magnetic core-shell nanomaterial leading to fluorescence quenching of carbon dots, appearance of TNT competitively replaced of carbon dots on the surface of the magnetic material through forming a Meisenheimer complex. This sensor exhibits excellent selectivity and sensitivity for TNT, and which provided a good dynamic linear range for TNT from 10 to 2000 ng mL−1. The experiments demonstrate a low detection limit of 2.15 ng mL−1. The intra-day precisions for 25, 100 and 500 ng mL−1 were 4.6, 2.3 and 0.5% (RSD, n = 6), inter-day precisions for 25, 100 and 500 ng mL−1 were 4.2, 2.5 and 0.9% (RSD, n = 6), respectively. The developed sensor was validated with river water, dust, and soil samples, and the achieved spiked recoveries were immensely satisfied from 98.1% to 102.0%. The Fe@SiO 2 –NH 2 possessed excellent reusability. This sensor exhibits that it is simple, sensitive and selective, and will be a vital analytical tool for TNT in many fields. [Display omitted] • Carbon dots were facilely synthesized with sodium citrate and polyacrylamide. • Sensitive chemosensor was developed with Fe@SiO 2 –NH 2 and the prepared carbon dots. • Chemosensor exhibits good sensitivity and selectivity for TNT. • The sensor provided remarkable merits and had promising application prospect. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00399140
- Volume :
- 233
- Database :
- Academic Search Index
- Journal :
- Talanta
- Publication Type :
- Academic Journal
- Accession number :
- 151125479
- Full Text :
- https://doi.org/10.1016/j.talanta.2021.122498