Colorimetric detection of Pb2+ ions using curcumin silver nanoparticles
Document Type
Article
Publication Date
12-1-2021
Abstract
The silver nanoparticles (AgNPs) complexed with curcumin (CUR) extracted from turmeric (TMR) were synthesized and applied for a simple and rapid colorimetric technique for Pb2+ detection. The results reveal that our low-cost and rapid AgNPs-CUR sensor is highly selective for Pb2+ ions with the detection limit of 13.6 mu M (2.8 mg.L-1) and can be applied for real water samples. Not only the observed absorption spectrum and the solution color can reveal the contamination of Pb2+ in the sample, but also an orange floccules precipitate can be clearly observed by naked-eye within 20 min. In addition, the results obtained from DFT calculation agree well with the experiments. Density functional theory (DFT), at the M06 level with mixed basis set of 6-31G(d) and def2-tzvp, was applied to propose the binding mechanism of AgNPs with CUR and AgNPs-CUR with Pb2+. Calculated binding energies of the compound of AgNPs with CUR and the AgNPs-CUR with Pb2+ are -145.8 and -361.4 kcal mol(-1), respectively, indicating that the AgNPs-CUR is strongly interact with Pb2+ ions through formation of highly stable Pb(2+)AgNPs-CUR complexes indicating the stable aggregative phenomena which agrees well with FTIR spectrum. (C) 2021 Elsevier B.V. All rights reserved.
Keywords
Silver nanoparticles, Biosynthesis, Colorimetric detection, Density functional theory, Turmeric extract
Divisions
Science
Funders
Chulalongkorn University [CU-59-030-AM],Khon Kaen University [RP64-4-002]
Publication Title
Journal of Molecular Liquids
Volume
343
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS