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| Pàgina inicial > Articles > Articles publicats > Live synthesis of selective carbon dots as fluorescent probes for cobalt determination in water with an automatic microanalyzer |
(Universitat Autònoma de Barcelona. Departament de Química) (Universitat Autònoma de Barcelona. Departament de Química) (Universitat Autònoma de Barcelona. Departament de Química)| Data: | 2023 |
| Resum: | A new strategy integrating the straight synthesis of carbon dots (CDs) and their direct use for the determination of heavy metals by means of fuorescence quenching is presented. The proposal consists of a modular analyzer, which includes a low temperature co-fred ceramics (LTCC) microreactor for the synthesis of CDs and a cyclic olefn copolymer (COC) microfuidic platform, which automatically performs a reverse fow injection analysis (rFIA) protocol for the determination of heavy metal ions in water by CD fuorescence quenching. As a proof of concept, nitrogen-doped CDs were synthesized from acrylic acid and ethylenediamine (ED) with quantum yields (QYs) of up to 44%, which are selective to cobalt. With the described system, we synthesized homogeneous CDs without the need for further purifcation and with the minimum consumption of reagents, and optimized fuorescence measurements can be performed with freshly obtained luminescent nanomaterials that have not undergone decomposition processes. They have an averagehydrodynamic diameter of 4. 2±0. 9 nm and maximum excitation and emission wavelengths at 358 nm and 452 nm, respectively. The system allows the automatic dilution and bufering of the synthesized CDs and the sample prior to the determination of cobalt. The concentration of cobalt was determined with good sensitivity and a limit of detection of 7 μg·L−1 with a linear range of 0. 02-1 mg·L−1 of Co2+. Spiked tap water and river water samples were analyzed, obtaining recovery from 98 to 104%. This demonstrates the potential of the equipment as an efcient on-site control system for heavy metal monitoring in water. |
| Ajuts: | Agencia Estatal de Investigación PRE2018-084834 Agencia Estatal de Investigación CTQ2017-85011-R Agencia Estatal de Investigación PID2020-117216RB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00124 |
| Nota: | Altres ajuts: acords transformatius de la UAB |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Matèria: | Carbon dots ; Cobalt determination ; Fluorescence quenching ; Microfluidics ; Microreactor |
| Publicat a: | Mikrochimica acta, Vol. 190, Issue 10 (September 2023) , art. 400, ISSN 1436-5073 |
