Reversible Hydrophobic Deep Eutectic Solvent-Based Uranyl-Sensing Optode Film in Aqueous Streams: Color Transformation and Reusability
Abstract
A hydrophobic deep eutectic solvent (HDES)-based optode was designed for the preconcentration and determination of the UO 2 2+ ion in aqueous media using spectroscopic techniques [energy-dispersive X-ray fluorescence (EDXRF) and solid-state absorption]. The optode was developed by incorporation of HDES (tri- n -octyl phosphine oxide and decanoic acid in an equimolar ratio), tri-(2-ethylhexyl) phosphate, and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol into a cellulose triacetate matrix. Characterization studies were carried out using different techniques to understand the roles of HDES as a plasticizer, UO 2 2+ extractant, and Br-PADAP immobilizer. Uptake studies revealed that the optimal pH was 3 and sorption followed the type II adsorption isotherm. Uranium in the U-sorbed optode can be directly analyzed over a large concentration range of 0.021 × 10 –3 –2.1 × 10 –3 Mol L –1 using EDXRF. The optode film exhibited a linear dynamic range of 0.84 × 10 –6 –84 × 10 –6 Mol L –1 for uranium, with a lowest limit of detection of 0.084 × 10 –6 Mol L –1 by colorimetric analysis. This optode-based method was employed for seawater analysis for its UO 2 2+ concentration without any matrix separation, and the concentration was found to be 1.30 ± 0.06 × 10 –8 Mol L –1 . The optode exhibited better selectivity for UO 2 2+ in the presence of various cations including Sr 2+ and Cs + in an aqueous medium. Compared to other prevailing optical sensors, this optode performed better in terms of key factors like pH, equilibration time, reusability, and detection limit.
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Electromembrane extraction integrates DES-based systems with electrically driven analyte transport, providing improved selectivity and more effective preconcentration of ionic species compared with many traditional liquid-phase extraction techniques.
“Electromembrane extraction integrates DES-based systems with electrically driven analyte transport, providing improved selectivity and more effective preconcentration of ionic species compared with many traditional liquid-phase extraction techniques [52,78].”
From Eco-Friendly Deep Eutectic Solvent-Based Extraction Technologies: A Comprehensive Review of Principles, Applications, and Comparative Insights (2026) · cites this paper as [78]
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Alahmadi, S. M., & Abu-Dief, A. M. (2026) · Sustainable Chemistry · doi:10.3390/suschem7030033 · Cited by 1 · see citing works
“Electromembrane extraction integrates DES-based systems with electrically driven analyte transport, providing improved selectivity and more effective pre-concentration of ionic species compared with many traditional liquid-phase extraction techniques [52,78].”
- Authors
- Shrivastava, K. C., Kumar, K. S. A., Sengupta, A., Ali, S. M., & Ramkumar, J.
- Affiliations
- Bhabha Atomic Research Centre (IN)
- Chemical Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
- Corresponding author
- Shrivastava, Komal C.
- Venue
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2024-07-23
- Volume
- 96
- Issue
- 31
- Pages
- 12658-12666
- ISSN
- 0003-2700 (ISSN-L)
- 1520-6882
- OpenAlex
- W4400932678
- Cited by
- 9
- References
- 69
- Citations by year
- 2026: 5 · 2025: 3 · 2024: 1
- FWCI
- 0.99
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Analytical Chemistry (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Radioactive element chemistry and processing
- Physical Sciences › Chemistry › Analytical Chemistry › Analytical chemistry methods development
- Physical Sciences › Chemical Engineering › Bioengineering › Analytical Chemistry and Sensors
- Keywords
- optode, hydrophobic deep eutectic solvents, uranyl ion, colorimetric sensor, cellulose triacetate films, trioctylphosphine oxide, capric acid, 5-Br-PADAP, sorption, adsorption isotherms, seawater analysis, preconcentration, plasticizers
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