Abstract
In recent years, carbon dots (CDs) are promising fluorescence probes for ions detection. In this paper, the CDs which are with an average diameter of 5.5 nm were synthesized through a simple one-step hydrothermal carbonization of ethylene diamine tetraacetic acid (EDTA) salt. The CDs have strong yellow photoluminescence (PL) with a maximum emission intensity at 550 nm under an excitation wavelength of 450 nm. As the electron transfer will occur between Cr (VI) and the CDs, yellow fluorescence was quenched after adding the Cr (VI) ions. The CDs probe allows the detection of Cr (VI) ions over a concentration range from 0 to 0.1 M (R2 = 0.987) and the lower detection limit is 10−5 M. Simultaneously, the CDs show highly selectivity and stability toward the detection of Cr (VI) ions.
Highlights
In the previous several years, carbon dots (CDs) have had a wide range of applications in scientific and technological field because of their unique and novel properties (Bourlinos et al, 2012)
In order to perform the detection experiments, water-soluble CDs were prepared by hydrothermal carbonization of ethylene diamine tetraacetic acid (EDTA) (Pan et al, 2010)
The above results are consistent with X-ray diffraction (XRD), indicating that the molecular structure of EDTA exists on the surface of CDs
Summary
In the previous several years, carbon dots (CDs) have had a wide range of applications in scientific and technological field because of their unique and novel properties (Bourlinos et al, 2012). CDs are superior in many aspects such as excellent water solubility, photobleaching resistance, low cytotoxicity, high biocompatibility, good photostability, tunable excitation, and adjustable emission spectrum (Baker and Baker, 2010; Qu et al, 2013; Gao et al, 2015). Due to these excellent properties, CDs can replace toxic quantum dots to apply in many clinic and environment (Goh et al, 2012; Hola et al, 2014; Gedda et al, 2016; Gong et al, 2016). Zhang and Chen put forward an economical and green synthetic method of fluorescent CDs and they can be applied in mercuric ion (Hg2+) detection
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