Determination of uranium in environmental sample by nanosensor graphene quantum dots

Dewangan, Pradeep Kumar; Khan, Fahmida; Shrivas, Kamlesh; Sahu, Vinayak

doi:10.1007/s10967-019-06512-x

Cited by 15 publications

(7 citation statements)

References 42 publications

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“…Then, UV–vis spectra were used to further confirm the interaction between GQDs and COS (Figure C). The peak at 295 nm was assigned as typical absorption of CC groups in the absorption spectra of GQDs because of the n−π* transition obtained . In the UV–vis spectrum of the GQDs-COS, the broad absorption band at about 350 nm (red arrow) might be ascribed to the CO group of COS .…”

Section: Resultsmentioning

confidence: 91%

Augmented Graphene Quantum Dot-Light Irradiation Therapy for Bacteria-Infected Wounds

Mei

Gao

Shi

et al. 2020

ACS Appl. Mater. Interfaces

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This paper proposes a highly efficient antibacterial system based on a synergistic combination of photodynamic therapy, photothermal therapy, and chemotherapy. Chitosan oligosaccharide functionalized graphene quantum dots (GQDs-COS) with short-term exposure to 450 nm visible light are used to promote rapid healing in bacteria-infected wounds. The GQDs undergo strong photochemical transformation to rapidly produce radical oxygen species and heat under light illumination, while the COS has an innate antimicrobial ability. Moreover, the positively charged GQDs-COS can easily capture bacteria via electrostatic interactions and kill Gram-positive and Gram-negative bacteria by multivalent interactions and synergistic effects. The antibacterial action of this nanocomposite causes irreversible damage to outer and inner bacterial membranes, resulting in cytoplasm leakage and death. The system has good hemocompatibility and low cytotoxicity and can improve the healing of infected wounds, as demonstrated by the examination of pathological tissue sections and inflammatory markers. These results suggest that GQDs anchored with bioactive molecules are a potential photo-activated antimicrobial strategy for anti-infective therapy.

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Section: Resultsmentioning

confidence: 91%

Augmented Graphene Quantum Dot-Light Irradiation Therapy for Bacteria-Infected Wounds

Mei

Gao

Shi

et al. 2020

ACS Appl. Mater. Interfaces

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“…[19][20][21][22] In the last two decades, creating selective and sensitive fluorescent sensors for essential radioactive elements has piqued some attention in the metal-sensing sectors. [23,24] As a result, many researchers have begun to focus on the field of uranium sensing, which produces signals in response to physical or chemical interactions. A system or design capable of responding to uranium ions is referred to as a U VI reagent.…”

Section: Introductionmentioning

confidence: 99%

“…A system or design capable of responding to uranium ions is referred to as a U VI reagent. [ 24 ] Even though many fluorescent sensors for radioactive metals have been developed and fabricated, only a few sensors have been designed to detect and identify U(VI) ions in aqueous solutions. Therefore, our goal was to create a new reagent with sensitivity and selectivity for detecting and monitoring U(VI) ions.…”

Section: Introductionmentioning

confidence: 99%

A novel spectrofluorimetric method based on a reaction with an azoisoxazoles–benzenesulfonamide derivative for determination of uranium (VI) ions in water samples

et al. 2022

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Selective fluorometric detection and determination of uranium ions is provided here using a novel fluorescent reagent, namely (E)-4-([4-hydroxynaphthalen-1-yl]diazenyl)-N-(5-methyleisoxazol-3-yl) benzenesulfonamide (U VI reagent). The U VI reagent offers a selective fluorescence enhancement behaviour at emission wavelength = 557 nm. The parameters affecting fluorometric detection of uranium ions, such as the pH, solvent type, ligand concentration, interaction time, and interfering ions, were investigated and adjusted. The proposed U VI reagent can detect and determine uranium ions even at low concentrations, for which the obtained limit of detection was 0.1 ppm. Additionally, this proposed determination protocol was successfully used to detect, monitor, and determine uranium ions in actual water samples.

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“…Comparatively, electroanalytical techniques [13] are relatively effective because they are simple to operate, low in cost, and can reach extremely low detection limits. Commonly used electrochemical analysis techniques are adsorptive stripping voltammetry (AdSV) [14][15][16], differential pulse voltammetry (DPV) [17] and cyclic voltammetry (CV) [18]. Due to its portability and low power requirements, voltammetry technology is particularly suitable for on-site monitoring of uranium [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Novel Electrochemical Sensor Modified with a Computer-Simulative Magnetic Ion-Imprinted Membrane for Identification of Uranyl Ion

Wang

et al. 2022

Sensors

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In this paper, a novel ion-imprinted electrochemical sensor modified with magnetic nanomaterial Fe3O4@SiO2 was established for the high sensitivity and selectivity determination of UO22+ in the environment. Density functional theory (DFT) was employed to investigate the interaction between templates and binding ligands to screen out suitable functional binding ligand for the reasonable design of the ion imprinted sensors. The MIIP/MCPE (magnetic ion imprinted membrane/magnetic carbon paste electrode) modified with Fe3O4@SiO2 exhibited a strong response current and high sensitivity toward uranyl ion comparison with the bare carbon paste electrodes. Meanwhile, the MCPE was fabricated simultaneously under the action of strong magnetic adsorption, and the ion imprinted membrane can be adsorbed stably on the electrode surface, handling the problem that the imprinted membrane was easy to fall off during the process of experimental determination and elution. Based on the uranyl ion imprinting network, differential pulse voltammetry (DPV) was adopted for the detection technology to realize the electrochemical reduction of uranyl ions, which improved the selectivity of the sensor. Thereafter, uranyl ions were detected in the linear concentration range of 1.0 × 10−9 mol L−1 to 2.0 × 10−7 mol L−1, with the detection and quantification limit of 1.08 × 10−9 and 3.23 × 10−10 mol L−1, respectively. In addition, the sensor was successfully demonstrated for the determination of uranyl ions in uranium tailings soil samples and water samples with a recovery of 95% to 104%.

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Determination of uranium in environmental sample by nanosensor graphene quantum dots

Cited by 15 publications

References 42 publications

Augmented Graphene Quantum Dot-Light Irradiation Therapy for Bacteria-Infected Wounds

Augmented Graphene Quantum Dot-Light Irradiation Therapy for Bacteria-Infected Wounds

A novel spectrofluorimetric method based on a reaction with an azoisoxazoles–benzenesulfonamide derivative for determination of uranium (VI) ions in water samples

A Novel Electrochemical Sensor Modified with a Computer-Simulative Magnetic Ion-Imprinted Membrane for Identification of Uranyl Ion

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