Live synthesis of selective carbon dots as fluorescent probes for cobalt determination in water with an automatic microanalyzer

Alex Pascual-Esco, Pere Lleonart, Antonio Calvo-López, Julián Alonso-Chamarro, Mar Puyol

Producció científica: Contribució a revistaArticleRecercaAvaluat per experts

2 Cites (Scopus)
1 Descàrregues (Pure)

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 average hydrodynamic 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
Idioma originalAnglès
Número d’article400
Nombre de pàgines11
RevistaMicrochimica Acta
Volum190
Número10
Data online anticipada19 de set. 2023
DOIs
Estat de la publicacióPublicada - d’oct. 2023

Fingerprint

Navegar pels temes de recerca de 'Live synthesis of selective carbon dots as fluorescent probes for cobalt determination in water with an automatic microanalyzer'. Junts formen un fingerprint únic.

Com citar-ho