Colorimetric detection of Pb2+ ions using curcumin silver nanoparticles

Chanajaree, Rungroj and Ratanatawanate, Chalita and Ruangchaithaweesuk, Songtham and Lee, Vannajan Sanghiran and Wittayanarakul, Kitiyaporn (2021) Colorimetric detection of Pb2+ ions using curcumin silver nanoparticles. Journal of Molecular Liquids, 343. ISSN 0167-7322, DOI

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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.

Item Type: Article
Funders: Chulalongkorn University [CU-59-030-AM], Khon Kaen University [RP64-4-002]
Uncontrolled Keywords: Silver nanoparticles; Biosynthesis; Colorimetric detection; Density functional theory; Turmeric extract
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 01 Apr 2022 08:08
Last Modified: 01 Apr 2022 08:08

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