WITHDRAWN: One-pot simple green synthesis of water-soluble cleaner fluorescent carbon dots from cellulose and its sensitive detection of iron ion

Wang, Jie; Chu, Yuhao; Qiu, Fengxian; Li, Xin; Wu, Haixia; Pan, Jianming; Niu, Xiangheng; Zhang, Tao; Yang, Dongya

doi:10.1016/j.jclepro.2017.07.187

Cited by 2 publications

(5 citation statements)

References 50 publications

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“…This happens because the transferring outer electron relinquishes some energy by emitting an X-ray. Thus, by measuring the amounts of energy present in the X-rays being released by CDs during electron beam bombardment, the identity of atoms from which the X-ray was emitted were established as shown in Figure 3 [56][57][58][59]. The presence of copper (Cu) is as a result of elemental transfer from the measuring tool to CDs.…”

Section: Energy Dispersive Spectroscopy (Eds)mentioning

confidence: 99%

“…The XPS wide spectrum ( Figure 4A There is a significant elemental increase of carbon from 57.32% in tapioca (precursor) to 70.652% in the content of CDs. Furthermore, there is a significant decreased content of oxygen from 42.68% to 21.349% due to the decomposition and intermolecular formation of hydrocarbon rings (cyclization) by hydrothermal reaction [57]. Based on the XPS and EDS elemental analysis, the hybridization and coefficients that exists between the functional groups and carbon core contributed to the luminescent and adsorptive behavior of CDs [61].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

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Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

et al. 2020

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The materials and substances required for sustainable water treatment by adsorption technique, are still being researched widely by distinguished classes of researchers. Thus, the need to synthesize substances that can effectively clean up pollutants from the environment cannot be overemphasized. So far, materials in bulk forms that are rich in carbon, such as biochar and varieties of activated carbon have been used for various adsorptive purposes. The use of bulk materials for such purposes are not efficient due to minimal surface areas available for adsorption. This study explores the adsorption task at nano dimension using carbon dots (CDs) from tapioca. The properties of carbon structure and its influence on the adsorptive efficacy of carbon nanoparticles were investigated by energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HrTEM), and atomic force microscopy (AFM). The results implied carbon present in CDs are good adsorbents for effective adsorption of heavy metal ions (lead) with removal efficiency of 80.6% in aqueous environment. The adsorption process as explored by both Langmuir and Freundlich isotherms have proven favorability of the adsorption process. Langmuir form two and three have correlation coefficients R2 at 0.9922 and 0.9912, respectively. The Freundlich isotherm confirms CDs as having defined surface heterogeneity and the exponential distribution of active sites. The adsorption of lead unto CDs obeyed the second order kinetic model with coefficient of determination, R2 of 0.9668 and 0.9996 at an initial lead concentration of 20 mg/L and 100 mg/L, respectively. The findings validated the efficiency of CDs derived from tapioca as an excellent material for further utilization in the environmental fields of wastewater pollution detection and clean up, bio-imaging, and chemical sensing applications.

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Section: Energy Dispersive Spectroscopy (Eds)mentioning

confidence: 99%

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

et al. 2020

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“…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%

“…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%

“…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]. The as-formed CDs exhibit a yellow color, showing greenish emission under UV-lamp (365 nm), good water solubility and long shelf-life (up to 1 year) with no apparent agglomeration.…”

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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WITHDRAWN: One-pot simple green synthesis of water-soluble cleaner fluorescent carbon dots from cellulose and its sensitive detection of iron ion

Cited by 2 publications

References 50 publications

Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

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

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