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Your search keyword '"Valeria Nicorescu"' showing total 3 results
Start Over Author "Valeria Nicorescu" Topic electrochemical detection
3 results on '"Valeria Nicorescu"'

1. Graphene Oxide Electroreduced onto Boron-Doped Diamond and Electrodecorated with Silver (Ag/GO/BDD) Electrode for Tetracycline Detection in Aqueous Solution

Author

Sorina Negrea, Lidia Ani Diaconu, Valeria Nicorescu, Sorina Motoc (m. Ilies), Corina Orha, and Florica Manea

Subjects
silver electrocatalyst, tetracycline, electrochemical detection, silver-graphene oxide-boron-doped diamond, Chemistry, QD1-999
Abstract

A new electrochemical sensor designed by modifying the commercial boron-doped diamond (BDD) electrode with graphene oxide (GO) reduced electrochemically and further electrodecorated with silver (Ag), named the Ag/GO/BDD electrode, was selected among a series of the BDD, GOelectroreduced onto BDD (GO/BDD) and silver electrodeposited onto BDD (Ag/BDD) electrodes for the detection of tetracycline (TC) in aqueous solution. The best results regarding the sensitivity of 46.6 µA·µM−1·cm−2 and the lowest limit of detection of 5 nM was achieved using square-wave voltammetry (SWV) operated at the step potential of 5 mV, modulation amplitude of 200 mV and the frequency of 10 Hz in alkaline medium. The application of the alkaline supporting electrolyte-based procedure is limited for water monitoring due to the presence of chloride that interferes with TC detection; however, it can be applied for quantitative determination of pharmaceutical formulations. 0.1 M Na2SO4 supporting electrolyte eliminated chloride interference and can be used for the application of Ag/GO/BDD in practical detection of TC in water.

Published
2021
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2. Comparative testing of Ag/Au/Pt graphene electromodified electrodes in electrochemical detection of tetracycline-emerging pollutant

Author

Dorian Gabriel Neidoni, Anamaria Baciu, Claudia Licurici, Sorina Claudia Negrea, Lidia Ani Diaconu, Florica Manea, and Valeria Nicorescu

Subjects
Pollutant, Materials science, Tetracycline, Graphene, law, Electrode, General Engineering, medicine, Ocean Engineering, Nanotechnology, Electrochemical detection, medicine.drug, law.invention
Abstract

This study aimed to obtain new electrochemically modified electrodes with graphene and Au, Pt, Ag particles considering graphite (GP) and glassy carbon (GC) substrate by applying the chronoamperometry technique to develop the detection protocol of tetracycline (TC) considered as an emerging pollutant in water, using cyclic voltammetry (CV) technique. The graphite-based substrate used for Ag/ Au/ Pt electrodeposition led to the electrode compositions on which TC oxidation process was not diffusion-controlled and as consequence, TC detection failed. TC detection protocols were developed for all Ag/Au /Pt electrodeposited GC and GCGP electrodes. Better limits of TC detection was achieved for Ag electrodeposited on GC-GP at the cathodic potential of 0.460 V/SCE.

Published
2020

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