Sensitive determination of uranium using ß-cyclodextrin modified graphene oxide and X-ray fluorescence techniques: EDXRF and TXRF.
Talanta
; 246: 123501, 2022 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-35525057
ABSTRACT
ß-cyclodextrin/graphene oxide (GO-ß-CD) was applied for dispersive micro-solid phase extraction (DMSPE) of uranyl ions (UO22+) from water samples and their determination by energy-dispersive (EDXRF) and total-reflection X-ray fluorescence spectrometry (TXRF). The structure of GO-ß-CD was characterized by X-ray photoelectron spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The results of batch adsorption experiment indicate that the maximum recoveries for UO22+ ions are observed at pH 4.5. The Langmuir isotherm model fits the adsorption data, which stands for the chemisorption mechanism. The obtained adsorption capacity of 87.7 mg g-1 indicates a great potential of the synthesized adsorbent in the UO22+ ions preconcentration. The GO-ß-CD exhibits high resistance to high ionic strength (up to 2 mol L-1), indicating that high salinity samples can be treated with the evaluated preconcentration procedure. The obtained limit of detection values were 0.40 µg L-1 for the EDXRF and only 0.014 µg L-1 for TXRF analysis. The accuracy of the method was verified by analyzing certified reference material (spring water NIST-SRM 1640a) and spiked water samples (mineral, lake, river, and artificial sea water).
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Urânio
/
Beta-Ciclodextrinas
/
Grafite
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Talanta
Ano de publicação:
2022
Tipo de documento:
Article
País de publicação:
HOLANDA
/
HOLLAND
/
NETHERLANDS
/
NL
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PAISES BAJOS
/
THE NETHERLANDS