High luminescent carbon dots as an eco-friendly fluorescence sensor for Cr(VI) determination in water and soil samples

Vaz, Roberto; Bettini, Jefferson; Júnior, José Guimarães F.; Lima, Elysson David S.; Botero, Wander Gustavo; Santos, Josué Carinhanha Caldas; Schiavon, Marco A.

doi:10.1016/j.jphotochem.2017.06.047

Cited by 79 publications

(26 citation statements)

References 40 publications

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“…For analytical parameters optimization, the slope of calibration curve was used based on Eq. ( 1 ) 18 : where F 0 and F represent the PL intensities of PANI/Ag (AMPSA)/GO QDs in the absence and presence of Cr(VI) ions, respectively and C Cr(VI) is the concentration of chromium (mg/L). The slope and the intercept of the calibration curve are represented by a and b, respectively.…”

Section: Methodsmentioning

confidence: 99%

Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Ebrahim

Shokry

Khalil

et al. 2020

Sci Rep

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Selective determination of toxic hexavalent chromium (Cr(VI)) is a stringent important due to its huge negative impact on the health and environment. Recently, the high sensitivity, rapidness, and cost-effectiveness of the fluorescent sensors for Cr(VI) have been developed. A fluorescent nanocomposite (NC) has been synthesized based on doped polyaniline (PANI), 2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped Ag nanoparticles (NPs) and graphene oxide (GO) quantum dots (QDs) via in situ reaction for highly selective sensing of Cr(VI) ions based on the luminescent quenching in the range from 0.01 to 7.5 mg/L. This NC showed an emission peak at 348 nm with a linear range from 0.01 to 0.05 mg/L and the low limit of detection (LOD) was 0.0065 mg/L (~ 6 µg/L). PANI/Ag (AMPSA) GO QDs NC displayed high selectivity for Cr(VI) over other common metal ions. Notably, the PANI/Ag (AMPSA) GO QDs NC can be used for distinguishing Cr(VI) and Cr(III) in solutions. The sensitive determination of Cr(VI) in real surface water samples was also confirmed and demonstrated recoveries in the range 95.3–99.2%. This NC will emerge as a new class of fluorescence materials that could be suitable for practical applications.

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Section: Methodsmentioning

confidence: 99%

Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Ebrahim

Shokry

Khalil

et al. 2020

Sci Rep

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“…In the UV−vis absorption spectrum ( Figure 5), ON-CQDs and WN-CQDs presented two obvious absorption peaks at around 265 and 280 nm, respectively. The peaks at 265 and 280 nm were ascribable to the π-π* transition for the C=C or C=O bond in which the orbital was sp 2 hybridized clusters [24,26,27,63]. The fluorescence emission spectra of N-CQDs under different excitations were shown in Figure 6.…”

Section: Optical Properties Of N-cqdsmentioning

confidence: 99%

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Gao

Wang

et al. 2020

Nanomaterials

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Nitrogen-doped carbon quantum dots (N-CQDs) with strong fluorescence were prepared by a one-step hydrothermal method using natural biomass waste. Two efficient fluorescent probes were constructed for selective and sensitive detection of oxytetracycline (OTC). The synthesized N-CQDs were characterized by UV-visible absorption spectra, fluorescence spectra, Fourier transform infrared spectroscopy (FT-IR), X-ray photon spectroscopy (XPS), atomic force microscopy (AFM), and high-resolution transmission electron microscopy (HRTEM), which proved that the synthesized N-CQDs surface were functionalized and had stable fluorescence performance. The basis of N-CQDs detection of OTC was discussed, and various reaction conditions were studied. Under optimized conditions, orange peel carbon quantum dots (ON-CQDs) and watermelon peel carbon quantum dots (WN-CQDs) have a good linear relationship with OTC concentrations in the range of 2–100 µmol L−1 and 0.25–100 µmol L−1, respectively. ON-CQDs and WN-CQDs were both successfully applied in detecting the OTC in pretreated tap water, lake water, and soil, with the recovery rate at 91.724–103.206%, and the relative standard deviation was less than 5.35%. The results showed that the proposed N-CQDs proved to be green and simple, greatly reducing the detection time for OTC in the determination environment.

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“…For instance, the detection of hexavalent chromium(VI) has been reported through different fluorescence quenching or enhancement mechanisms. Vaz et al [ 180 ] explained that the quenching of fluorescent CDs in the presence of varying chromium(VI) concentrations in water and soil samples was due to IFE and static quenching mechanisms. The proposed sensor had an LOD of 0.03 µg mL −1 with a linear detection range of 0.1–12 µg mL −1 .…”

Section: Sensing Applicationsmentioning

confidence: 99%

Biogreen Synthesis of Carbon Dots for Biotechnology and Nanomedicine Applications

2018

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Over the past decade, carbon dots have ignited a burst of interest in many different fields, including nanomedicine, solar energy, optoelectronics, energy storage, and sensing applications, owing to their excellent photoluminescence properties and the easiness to modify their optical properties through doping and functionalization. In this review, the synthesis, structural and optical properties, as well as photoluminescence mechanisms of carbon dots are first reviewed and summarized. Then, we describe a series of designs for carbon dot-based sensors and the different sensing mechanisms associated with them. Thereafter, we elaborate on recent research advances on carbon dot-based sensors for the selective and sensitive detection of a wide range of analytes, including heavy metals, cations, anions, biomolecules, biomarkers, nitroaromatic explosives, pollutants, vitamins, and drugs. Lastly, we provide a concluding perspective on the overall status, challenges, and future directions for the use of carbon dots in real-life sensing.

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High luminescent carbon dots as an eco-friendly fluorescence sensor for Cr(VI) determination in water and soil samples

Cited by 79 publications

References 40 publications

Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Polyaniline/Ag nanoparticles/graphene oxide nanocomposite fluorescent sensor for recognition of chromium (VI) ions

Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Biogreen Synthesis of Carbon Dots for Biotechnology and Nanomedicine Applications

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