Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 377, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2023.121531
Keywords
Sulphur; Nitrogen and Oxygen donor ligand; Stabilizer; Silver Quantum Dots; Cation; Anions sensing; Nitrophenol reduction in water
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The paper presented the role of ligands in stabilizing colloidal silver-quantum dots (Ag-QDs) and their applications in colorimetric detection of metal ions/anions. The Ag-QDs were also used for reducing nitroaromatics and showed selective colorimetric sensing of Hg(II)/Cu(II) and I- ions. The results suggest that the ligands with donor atoms effectively stabilize the Ag-QDs and the pendant alkyl chain governs their dispersion, while the colorimetric change is attributed to ion-mediated aggregation of QDs.
The present paper showed the role of ligand in the effective stabilization of colloidal silver-quantum dots (Ag-QDs) and their applications for the colorimetric detection of metal ions/anions. Furthermore, the Ag-QDs have been explored to reduce nitroaromatics, industrial waste and pollutants. The donor atoms such as (N,S,O) present on ligands have been found to stabilize the Ag-QDs in the colloidal state effectively, and the pendant alkyl chain governs their uniform dispersion. The QDs (size ti 5 nm) are highly stable and can be kept in the colloidal state without aggregation for months under ambient conditions. The Ag-QDs showed naked-eye colorimetric sensing of Hg(II)/Cu(II) and I- ions selectively over other ions at very low concentrations. The colorimetric change has been attributed due to cation and anion-mediated aggregation of QDs. Furthermore, these QDs have also been found effective for reducing various nitroaro-matics into valuable amines in a very short time and showed first-order kinetics with the calculated rate of 0.1352 min -1. The Hammett plot suggests that the reaction rate depends on the groups present at the para-position to the nitro group with a negative slope of -1.291 which indicates that the reaction is pro-ceeding via the formation of a cationic intermediate. The results described in this paper will be the pio-neer in the field of designing of new ligands for the effective stabilization of metal nanoparticles in the colloidal state without altering their activity.(c) 2023 Elsevier B.V. All rights reserved.
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