GSH-doped GQDs using citric acid rich-lime oil extract for highly selective and sensitive determination and discrimination of Fe3+ and Fe2+ in the presence of H2O2 by a fluorescence “turn-off” sensor

Saenwong, Khanitta; Nuengmatcha, Prawit; Sricharoen, Phitchan; Limchoowong, Nunticha; Chanthai, Saksit

doi:10.1039/c7ra13432k

Cited by 22 publications

(10 citation statements)

References 84 publications

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“…The occurrence of static quenching through complex formation between Fe(III) ions and lone pair electrons of O in phenolic hydroxyl groups on the edge of S-GQDs had been reported in recent literature. 32 Both phenomena lead to non-radiative electron/hole recombination annihilation and uorescence quenching.…”

Section: Fluorescence Sensor For Chromium Ionsmentioning

confidence: 99%

Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples

et al. 2020

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Section: Fluorescence Sensor For Chromium Ionsmentioning

confidence: 99%

Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples

et al. 2020

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“…The turn-on sensor is superior to the turn-off sensor. It is more valuable and can find its applications in various fields. − …”

Section: Introductionmentioning

confidence: 99%

A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots

et al. 2021

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This study aims to use graphene quantum dots (GQDs) as a fluorescence switching sensor (turn on–off) for the simultaneous detection of cyanide (CN–) and ferricyanide [Fe(CN)6]3– in wastewater samples. The GQDs were synthesized by pyrolyzing solid citric acid. The intrinsic blue color of the solution was observed under ultraviolet irradiation. The fluorescence spectrum was maximized at both excitation and emission wavelengths of 370 and 460 nm, respectively. The fluorescence intensity of GQDs decorated with Hg2+ (turn-off mode as the starting baseline) could be selectively turned on in the presence of CN– and once back to turn-off mode by [Fe(CN)6]3–. The fluorescence switching properties were used to develop a fluorescence turn-on–off sensor that could be used to detect trace amounts of CN– and [Fe(CN)6]3– in water samples. For highly sensitive detection under optimum conditions (Britton–Robinson buffer solution in the pH range of 8.0–9.0, linearity ranges of 5.0–15.0 μM (R 2 = 0.9976) and 10.0–50.0 μM (R 2 = 0.9994), respectively, and detection limits of 3.10 and 9.48 μM, respectively), good recoveries in the ranges of 85.89–112.66% and 84.88–113.92% for CN– and [Fe(CN)6]3–, respectively, were recorded. The developed methods were successfully used for the simultaneous and selective detection of CN– and [Fe(CN)6]3– in wastewater samples obtained from local municipal water reservoirs.

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“…Because of their unique chemical, mechanical, and optical properties, graphene quantum dots (GQDs) have gained a lot of interest in the scientific community. − Compared to the standard semiconductor quantum dots (QDs), GQDs have many unique properties such as high biocompatibility, low toxicity, excellent solubility, robust photoluminescence (PL), and tunable band gaps, − which have prompted many possible applications of GQDs that include photodetectors, , bioimaging, − fluorescent agents, − adsorbent, , and sensors. , As a consequence, the identification limit, selectivity, sensitivity, and biocompatibility are very different in GQDs in comparison with that of QDs . Because of their excellent optical, electrical, mechanical, and thermal properties, GQDs have become one of the most common options to incorporate in sensors for detecting toxic metal ions .…”

Section: Introductionmentioning

confidence: 99%

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

et al. 2021

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This study aimed to synthesize dimethylglyoxime (DMG) (N-source)-doped graphene quantum dots (N-GQDs) via simultaneous pyrolysis of citric acid and 1.0% (w/v) DMG. The maximum excitation wavelength (λ max , ex = 380 nm) of the N-GQD solution (49% quantum yield (QY)) was a red shift with respect to that of bare GQDs (λ max , ex = 365 nm) (46% QY); at the same maximum emission wavelength (λ max , em = 460 nm), their resonance light scattering (RLS) intensity peak was observed at λ max , ex/em = 530/533 nm. FTIR, X-ray photoelectron spectroscopy, XRD, energy-dispersive X-ray spectroscopy, and transmission electron microscopy analyses were performed to examine the synthesized materials. The selective and sensitive detection of Ni 2+ using the RLS intensity was performed at 533 nm under the optimum conditions consisting of both 25 mg L –1 N-GQDs and 2.5 mg L –1 DMG in the ammonium buffer solution of pH 9.0. The linearity of Ni 2+ was 50.0–200.0 μg L –1 with a regression line, y = 5.031 x – 190.4 ( r 2 = 0.9948). The limit of detection (LOD) and the limit of quantitation (LOQ) were determined to be 20.0 and 60.0 μg L –1 , respectively. The method precision expressed as % RSDs was 4.90 for intraday ( n = 3 × 3) and 7.65 for interday ( n = 5 × 3). This developed method afforded good recoveries of Ni 2+ in a range of 85–108% when spiked with real water samples. Overall, this innovative method illustrated the identification and detection of Ni 2+ as a DMG complex with N-GQDs, and the detection was highly sensitive and selective.

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GSH-doped GQDs using citric acid rich-lime oil extract for highly selective and sensitive determination and discrimination of Fe³⁺ and Fe²⁺ in the presence of H₂O₂ by a fluorescence “turn-off” sensor

Abstract: Synthesis and characterization of graphene quantum dots (GQDs) simultaneously doped with 1% glutathione (GSH-GQDs) by pyrolysis using citric acid rich-lime oil extract as a starting material.

Cited by 22 publications

References 84 publications

Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples

Green and facile synthesis of water-soluble carbon dots from ethanolic shallot extract for chromium ion sensing in milk, fruit juices, and wastewater samples

A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots

Ultratrace Detection of Nickel(II) Ions in Water Samples Using Dimethylglyoxime-Doped GQDs as the Induced Metal Complex Nanoparticles by a Resonance Light Scattering Sensor

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