Microwave-assisted green synthesis of multi-functional carbon quantum dots as efficient fluorescence sensor for ultra-trace level monitoring of ammonia in environmental water.

Autor: Ganesan S; Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan., Kalimuthu R; Department of Polymer Science, University of Madras, Chennai City, Tamil Nadu, India., Kanagaraj T; Department of Analytical Chemistry, University of Madras, Chennai City, Tamil Nadu, India., Kulandaivelu R; Department of Analytical Chemistry, University of Madras, Chennai City, Tamil Nadu, India., Nagappan R; Department of Polymer Science, University of Madras, Chennai City, Tamil Nadu, India., Pragasan LA; Department of Environmental Sciences, Bharathiar University, Coimbatore City, Tamil Nadu, India., Ponnusamy VK; Department of Medicinal and Applied Chemistry, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Medical Research, Kaohsiung Medical University Hospital (KMUH), Kaohsiung City, 807, Taiwan; Department of Chemistry, National Sun Yat-sen University (NSYSU), Kaohsiung City, 804, Taiwan; PhD Program of Aquatic Science and Technology, College of Hydrosphere Science, National Kaohsiung University of Science and Technology (NKUST), Kaohsiung, Taiwan. Electronic address: kumar@kmu.edu.tw.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2022 Apr 15; Vol. 206, pp. 112589. Date of Electronic Publication: 2021 Dec 17.
DOI: 10.1016/j.envres.2021.112589
Abstrakt: This study reports a facile green preparation of self-assembled multi-functional carbon quantum dots (CQDs) via direct pyrolysis technique coupled with microwave-assisted synthesis using Ziziphus Mauritiana stone biomass (as a bio-resource precursor). The synthesized multi-functional CQDs was characterized using FT-IR, XRD, XPS, TEM, and fluorescence spectroscopy techniques. The results exhibit that the prepared CQDs are spherical-shaped with an average diameter of 2-4 nm and showed bright bluish-green emissions property with stable dispersion and high photostability in the aqueous medium. Furthermore, the emission properties of CQDs were examined by quenched with ammonia (NH 3 ) and other molecules in aqueous media. Results indicated that the developed CQDs showed effective fluorescent for the selective and sensitive detection (sensor) of NH 3 with a detection limit of 10 nM. Thus, the presented procedure is a simple, low-cost, efficient, chemical-free synthesis of CQDs and can be applied as selective and sensitive (sensor) monitoring of NH 3 concentration in aquatic environmental samples.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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