Luminescent carbon dots obtained from cellulose

Souza, Débora Rosa da Silva; Caminhas, Larissa Durães; Mesquita, João Paulo de; Pereira, Fabiano Vargas

doi:10.1016/j.matchemphys.2017.10.001

Cited by 112 publications

(62 citation statements)

References 26 publications

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“…Beyond 350 nm, a red-shift of the PL intensity was observed. The particle size selection and surface traps of CDs are the main factors responsible for the emission variation [27,51,65,66]. In contrast to the liquid CDs, PVA-CDs film exhibits only excitation-independent emission phenomena when exposed to varied excitation wavelengths (Figure 7c), which agrees with previous work [40].…”

Section: Optical Propertiessupporting

confidence: 89%

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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Section: Optical Propertiessupporting

confidence: 89%

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

Issa

Abidin

2020

Molecules

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“…The peak at 806 cm −1 is the characteristic breathing mode of triazine units . For the g‐C 3 N 4 nanosheets/CDs nanocomposite, the peaks at the ranges of 1600‐1770 cm −1 and 1350‐1460 cm −1 are corresponding to the stretching vibrations of C=O and CH 2 groups, respectively . The characteristic peak of BiOCl is observed at 524 cm −1 , which refers to the stretching vibration of Bi–O bond …”

Section: Resultsmentioning

confidence: 99%

Novel g‐C₃N₄ nanosheets/CDs/BiOCl photocatalysts with exceptional activity under visible light

2018

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We fabricated novel ternary nanocomposites through integration of C‐dots (carbon dots), BiOCl, and nanosheets of graphitic carbon nitride (g‐C3N4 nanosheets) by a cost‐effective route. The fabricated photocatalysts were subsequently characterized by XRD, EDX, TEM, HRTEM, XPS, FT‐IR, UV‐vis DRS, TGA, BET, and PL methods to gain their structure, purity, morphology, optical, textural, and thermal properties. In addition, the degradation intermediates were identified by gas chromatography‐mass spectroscopy (GC‐MS). Photocatalytic performance of the synthesized samples was studied by photodegradations of three cationic (RhB, MB, and fuchsine), one anionic (MO) dyes, one colorless (phenol) pollutant and removal of an inorganic pollutant (Cr(VI)) under visible light. It was revealed that the ternary nanocomposite with loading 20% of BiOCl illustrated superlative performances in the selected photocatalytic reactions compared with the corresponding bare and binary photocatalysts. Visible‐light photocatalytic activity of the g‐C3N4 nanosheets/CDs/BiOCl (20%) nanocomposite was 42.6, 27.8, 24.8, 20.2, and 15.9 times higher than the pure g‐C3N4 for removal of RhB, MB, MO, fuchsine, and phenol, respectively. Likewise, the ternary photocatalyst showed enhanced activity of 15.3 times relative to the g‐C3N4 in photoreduction of Cr(VI). Moreover, the ternary nanocomposite exhibited excellent chemical stability and recyclability after five cycles. Finally, the mechanism for improved photocatalytic performance was discussed based on the band potential positions.

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“…The procedure, is an established process of calculating quantum yields of photoluminescent substances. Quinine sulphate as reference quantum yield was held at 54.6 [22][23][24][25][26].…”

Section: Photoluminescent Quantum Yieldmentioning

confidence: 99%

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

et al. 2019

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Nowadays, to ensure sustainability of smart materials, it is imperative to eliminate or reduce carbon footprint related to nano material production. The concept of design of experiment to provide an optimal synthesis process, with a desired yield, is indispensable. It is the researcher’s goal to get optimum value for experiments that requires multiple runs and multiple inputs. Herein, is a reliable approach of utilizing design of experiment (DOE) for response surface methodology (RSM). Thus, to optimize a facile and effective synthesis process for fluorescent carbon dots (CDs) derived from tapioca that is in line with green chemistry principles for sustainable synthesis. The predictions for fluorescent CDs synthesis from RSM were in excellent agreement with the artificial neural network (ANN) model prediction by the Levenberg–Marquardt back propagation (LMBP) algorithm. Considering R2, root mean square error (RMSE) and mean absolute error (MAE) have all revealed a positive hidden layer size. The best hidden layer of neurons were discovered at point 4-8, to confirm the validity of carbon dots, characterization of surface morphology and particles sizes of CDs were conducted with favorable confirmations of the unique characteristics and attributes of synthesized CDs by hydrothermal route.

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Luminescent carbon dots obtained from cellulose

Cited by 112 publications

References 26 publications

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

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

Novel g‐C₃N₄ nanosheets/CDs/BiOCl photocatalysts with exceptional activity under visible light

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

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Luminescent carbon dots obtained from cellulose

Cited by 112 publications

References 26 publications

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

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

Novel g‐C3N4 nanosheets/CDs/BiOCl photocatalysts with exceptional activity under visible light

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

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Novel g‐C₃N₄ nanosheets/CDs/BiOCl photocatalysts with exceptional activity under visible light