Efficient removal of Cu(<scp>ii</scp>) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

Issa, Mohammed Abdullah; Pudza, Musa Yahaya; Zentou, Hamid

doi:10.1039/d0ra02276d

Cited by 23 publications

(15 citation statements)

References 63 publications

(64 reference statements)

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“…UV-vis absorption and PL spectra were recorded to study the optical behavior of the liquid and solid-state CDs. The UV-Vis absorption spectra ( Figure 3a) of both CDs and PVA-CDs film exhibit two absorption peaks centered at 294 and 340 nm, corresponding to the π-π * transition and n-π * transition of C=C and C=O, in line with previously reported data for carbon dot-based materials [10,40].…”

Section: Optical Propertiessupporting

confidence: 89%

“…To optimize the analytical performance, the influence of pH and response time on Cd 2+ adsorption using PVA-CDs film were evaluated. Figure 4a shows the % adsorption of Cd 2+ using PVA-CDs and uncoated CDs at different pH values (3)(4)(5)(6)(7)(8)(9)(10)(11). The adsorption efficiency of Cd 2+ for both PVA-CDs and uncoated CDs were found to rise in alkaline solutions, with a maximum % adsorption of 91 and 83, respectively.…”

Section: Effect Of Ph and Contact Time On CD 2+ Removalmentioning

confidence: 99%

“…The results reveal that the removal efficiencies of PVA-CDs film towards Ni 2+ , Pb 2+ , Cd 2+ , Zn 2+ and Hg 2+ were about 46.37, 91.26, 61%, respectively ( Figure S4). This suggests the more effective chelating kinetics of Cd 2+ to bind with the functional moieties on the PVA-CDs surface compared to other metal ions [10,68].…”

Section: Heavy Metal Complexation Test Using Pva-cds Filmsmentioning

confidence: 99%

“…Nowadays, carbon dots (CDs) have gained considerable attention for heavy metal removal from aqueous systems [9,10]. These CDs, with sizes less than 10 nm, exhibit outstanding properties like ease of preparation, non-toxic nature and excellent luminescence behavior.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Effect Of Ph and Contact Time On CD 2+ Removalmentioning

confidence: 99%

Section: Heavy Metal Complexation Test Using Pva-cds Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Issa

Abidin

2020

Molecules

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“…This indicates the suitability of developed reduced cubic model to predict the best conditions within specific ranges in the tested variables. It is worth noting that the obtained QY of the present work in a considerably short synthesis duration is much higher than values previously reported for biomass based CDs in the presence of different nitrogen species (Table S1) [19][20][21][22][23] . This suggest LPEI as a great competitor for replacing the traditional N doping agents.…”

Section: Effect Of Variables On the Pl Qycontrasting

confidence: 65%

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Issa

Abidin

Sobri

et al. 2020

Sci Rep

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A versatile synthetic approach for development of highly fluorescent nitrogen-doped carbon dots (n-cDs) from carboxymethylcellulose in the presence of linear polyethyleneimine (Lpei) has been developed. According to single factor method, central composite design incorporated with response surface methodology matrix was applied to find and model optimal conditions for the temperature (220-260 °C), duration (1-3 h) and LPEI weight (0.5-1.5%). The statistical results show that duration was the most significant parameter for efficient carbonization conversion rate in comparison with temperature and Lpei weight. the reduced cubic model (R 2 = 0.9993) shows a good correlation between the experimental data and predicted values. the optimal variables were temperature of 260 °C, duration of 2 h and LPEI weight of 1%. Under these conditions, quantum yield of up to 44% was obtained. The numerically optimized N-CDs have an average size of 3.4 nm with graphitic nature owing to the abundant amino species incorporated into the carbon core framework. the blue-green n-cDs possess emission dependent upon the solvent polarity, wide pH stability with enhanced emission in an acidic environment. Impressively, the N-CDs show long-shelf-life for up to 1 year with no noticeable precipitation. the n-cDs were able to recognize a high concentration of fe 3+ ions with a detection limit of 0.14 μM in acidic solution owing to the special coordination for Fe 3+ to be captured by electron-donating oxygen/ amino groups around n-cDs. Moreover, the n-cDs can also be used as a new kind of fluorescent ink for imaging applications. Carbon dots (CDs) are the latest member of fluorescent carbon nano-sized family. Typically, CDs are nearly spherical-shaped nanoclusters with sizes of less than 10 nm and consist of amorphous or crystalline cores with sp 2 carbon atoms 1. Since the first established work 2 , CDs have attracted a considerable focusing in the fields of wastewater treatment, photocatalysis, bioimaging, cancer therapy and chemical sensing 3,4. This is owing to their feature of having outstanding optical properties, including excellent biocompatibility, tuneable photoluminescence, negligible toxicity, ease of production and resistance to photobleaching in comparison to QDs counterparts 5-7. It is well known that QDs, for instance, tend to be decayed in the biological environment leading to a serious toxicity concern 8 .

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Carbon Dots: Emerging Green Nanoprobes and Their Diverse Applications

Agarwal¹,

Bhatia²

2021

Functionalized Nanomaterials for Catalytic Application

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Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

Abstract: Low value waste resources have been converted into value-added luminescence carbon dots for copper adsorption from contaminated water.

Cited by 23 publications

References 63 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

Fluorescent recognition of Fe3+ in acidic environment by enhanced-quantum yield N-doped carbon dots: optimization of variables using central composite design

Carbon Dots: Emerging Green Nanoprobes and Their Diverse Applications

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