Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe<sup>3+</sup> ions in an acidic environment

Wu, Peng; Li, Wei; Wu, Qiong; Liu, Yushan; Liu, Shouxin

doi:10.1039/c7ra08400e

Cited by 209 publications

(137 citation statements)

References 51 publications

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“…Figure 2 , which agree well with the (002) interlayer spacing of a graphite structure and revealing an amorphous carbon phase which is attributed to functional groups on the surface of N-CDs and carbonization in carbon core. 39,40 FT-IR was used to characterize the chemical structure of synthetic N-CDs and the precursor. As illustrated in Fig.…”

Section: Morphology and Structure Analysismentioning

confidence: 99%

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks

Dong

et al. 2018

NANO

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Fluorescent nitrogen-doped carbon dots (N-CDs) with excellent stability were prepared via single-step hydrothermal carbonization of citric acid (CA) and ethylenediamine (EDA). The as-prepared N-CDs emit blue fluorescence under the excitation of 365[Formula: see text]nm and have a size distribution of 2.80 ± 0.47[Formula: see text]nm with benign size effect. The structure and morphology were further characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. It was found that the surface of the N-CDs was successfully functionalized, which presented water solubility and chelation with Fe3+. XRD results display a diffraction peak at 23.9°C, which corresponds to the (002) interlayer spacing of a graphitic structure revealing an amorphous carbon phase. Furthermore, due to good sensitivity, N-CDs were used as probes for Fe3+ detection. The low limit of detection of 0.6[Formula: see text]μM as a fluorescence probe was successfully obtained based on the linear relationship between ([Formula: see text] and concentration of Fe3+ ions. Besides the satisfactory fluorescence, PVA/N-CDs membranes and fluorescent inks demonstrate potential for anti-counterfeiting applications due to its characteristic flexibility, transparency, removability and invisibility under ambient lighting.

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Section: Morphology and Structure Analysismentioning

confidence: 99%

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks

Dong

et al. 2018

NANO

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“…CMC, as a green and economic resource, is used as a carbon precursor for the production of fluorescent CDs. In contrast to other lignocellulosic materials reported in the literature [27,29], CMC of empty fruit bunches is enriched with ether and hydroxyl moieties which could play a major role in the enhancement of substitution degree and carbonization acceleration. Branched PEI was selected as a dopant for its feature to inject electron-rich N into the final framework of CDs and increasing QY with the ability to capture metal ions [9].…”

Section: Introductionmentioning

confidence: 60%

Sustainable Development of Enhanced Luminescence Polymer-Carbon Dots Composite Film for Rapid Cd2+ Removal from Wastewater

Issa

Abidin

2020

Molecules

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As a remedy for environmental pollution, a versatile synthetic approach has been developed to prepare polyvinyl alcohol (PVA)/nitrogen-doped carbon dots (CDs) composite film (PVA-CDs) for removal of toxic cadmium ions. The CDs were first synthesized using carboxymethylcellulose (CMC) of oil palms empty fruit bunch wastes with the addition of polyethyleneimine (PEI) and then the CDs were embedded with PVA. The PVA-CDs film possess synergistic functionalities through increasing the content of hydrogen bonds for chemisorption compared to the pure CDs. Optical analysis of PVA-CDs film was performed by ultraviolet-visible and fluorescence spectroscopy. Compared to the pure CDs, the solid-state PVA-CDs displayed a bright blue color with a quantum yield (QY) of 47%; they possess excitation-independent emission and a higher Cd2+ removal efficiency of 91.1%. The equilibrium state was achieved within 10 min. It was found that adsorption data fit well with the pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption uptake was 113.6 mg g−1 at an optimal pH of 7. Desorption experiments showhe that adsorbent can be reused fruitfully for five adsorption-desorption cycles using 0.1 HCl elution. The film was successfully applied to real water samples with a removal efficiency of 95.34% and 90.9% for tap and drinking water, respectively. The fabricated membrane is biodegradable and its preparation follows an ecofriendly green route.

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“…In an investigation, Wu et al synthesized N-doped CQDs with enhanced QY of 51% via hydrothermal method (11 h at 230 • C) by using ethylenediamine as N dopant, and a non-toxic C source-i.e., microcrystalline cellulose (consisting of 1,4-anhydro-D-glucopyranose units) [85]. However, Hou et al fabricated N-doped CQDs with enhanced QY of 73.2% via solid-phase thermal treatment (1.5 h at 170 • C) of citric acid (as C source) and dicyandiamide (as N source) [86].…”

Section: N-doped Cqdsmentioning

confidence: 99%

“…In another study, Li et al detected Fe 3+ ions by using N-doped CQDs, where a good linear correlation is attained between the fluorescence intensities and the concentration range of 0-100µM, with LOD of 0.001 M [82]. Similarly, Wu et al utilized N-doped CQDs as a fluorescent probe for Fe 3+ detection via fluorescent quenching, where high selectivity and sensitivity are achieved with LOD of Fe 3+ as low as 0.21 nM in the acidic environment [85]. In a similar investigation, Hou et al applied the as-prepared N-doped CQDs to the 'on-off-on' fluorescence sensing platform with the step-wise addition of Fe 3+ ions, where the LOD is calculated to be 50 nmol/L based on quenching phenomenon, which could be ascribed to the changes in the surface electron-hole recombination annihilation due to the formation of Fe 3+ -complexes on the surface of the CQDs [86].…”

Section: Sensing Of Metal Ionsmentioning

confidence: 99%

Recent Advancements in Doped/Co-Doped Carbon Quantum Dots for Multi-Potential Applications

Kandasamy

2019

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Carbon quantum dots (CQDs)/carbon nanodots are a new class of fluorescent carbon nanomaterials having an approximate size in the range of 2–10 nm. The majority of the reported review articles have discussed about the development of the CQDs (via simple and cost-effective synthesis methods) for use in bio-imaging and chemical-/biological-sensing applications. However, there is a severe lack of consolidated studies on the recently developed CQDs (especially doped/co-doped) that are utilized in different areas of application. Hence, in this review, we have extensively discussed about the recent development in doped and co-doped CQDs (using elements/heteroatoms—e.g., boron (B), fluorine (F), nitrogen (N), sulphur (S), and phosphorous (P)), along with their synthesis method, reaction conditions, and/or quantum yield (QY), and their emerging multi-potential applications including electrical/electronics (such as light emitting diode (LED) and solar cells), fluorescent ink for anti-counterfeiting, optical sensors (for detection of metal ions, drugs, and pesticides/fungicides), gene delivery, and temperature probing.

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Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe³⁺ ions in an acidic environment

Abstract: Nitrogen-doped carbon quantum dots prepared with microcrystalline cellulose display excellent sensitivity to Fe3+via dynamic quenching in an acidic environment.

Cited by 209 publications

References 51 publications

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks

Sustainable Development of Enhanced Luminescence Polymer-Carbon Dots Composite Film for Rapid Cd2+ Removal from Wastewater

Recent Advancements in Doped/Co-Doped Carbon Quantum Dots for Multi-Potential Applications

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Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe3+ ions in an acidic environment

Abstract: Nitrogen-doped carbon quantum dots prepared with microcrystalline cellulose display excellent sensitivity to Fe3+via dynamic quenching in an acidic environment.

Cited by 209 publications

References 51 publications

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe3+ Ions and Anti-Counterfeiting Inks

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe3+ Ions and Anti-Counterfeiting Inks

Sustainable Development of Enhanced Luminescence Polymer-Carbon Dots Composite Film for Rapid Cd2+ Removal from Wastewater

Recent Advancements in Doped/Co-Doped Carbon Quantum Dots for Multi-Potential Applications

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Hydrothermal synthesis of nitrogen-doped carbon quantum dots from microcrystalline cellulose for the detection of Fe³⁺ ions in an acidic environment

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks

Fluorescent Nitrogen-Doped Carbon Dots via Single-Step Synthesis Applied as Fluorescent Probe for the Detection of Fe³⁺ Ions and Anti-Counterfeiting Inks