The effect of functionalization on rice-husks derived carbon quantum dots properties and cadmium removal

Abidin, Nur Hafizah Zainal; Wongso, Viona; Hui, Khee Chung; Cho, Kuk; Sambudi, Nonni Soraya; Ang, Wei Lun; Saad, Bahruddin

doi:10.1016/j.jwpe.2020.101634

Cited by 40 publications

(12 citation statements)

References 55 publications

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“…As CDs possess unique photoluminescence and excitation-based emissions, quenching and reversal of quenching processes can be used as an analytical tool for detection of certain analytes. CDs have been widely used as sensors for metal ions such as Fe 3+ [ 49 , 59 , 85 , 138 – 141 ], Fe 2+ [ 25 ], Hg 2+ [ 109 , 142 – 143 ], Cu 2+ [ 86 , 108 , 144 – 146 ], Cd 2+ [ 147 ], Cr 6+ [ 52 , 148 – 152 ], Co 2+ [ 153 ], Au 3+ [ 154 ], As 3+ [ 155 – 156 ], Pb 2+ [ 157 ], and Ag + [ 158 ]. This sensing application is based on the principle that fluorescence is either quenched or increases when the functional groups on the surface of the CDs interact with the metal ions creating new electron–hole pairs via energy transfer.…”

Section: Reviewmentioning

confidence: 99%

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Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

Kanwal¹,

Bibi²,

Hyder³

et al. 2022

Beilstein J. Nanotechnol.

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Carbon dots (CDs) show extensive potential in various fields such as sensing, bioimaging, catalysis, medicine, optoelectronics, and drug delivery due to their unique properties, that is, low cytotoxicity, cytocompatibility, water-solubility, multicolor wavelength tuned emission, photo-stability, easy modification, strong chemical inertness, etc. This review article especially focuses on the recent advancement (2015–2022) in the green synthesis of CDs, their application in metal ions sensing and microbial bioimaging, detection, and viability studies as well as their applications in pathogenic control and plant growth promotion.

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Section: Reviewmentioning

confidence: 99%

“…Moreover, electron transfer between the CDs and Cd 2+ may result in reducing the latter to Cd. The quenching due to –COOH groups is stronger than that due to amino groups, because of high electronegativity of–COOH [ 147 ].…”

Section: Reviewmentioning

confidence: 99%

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

Kanwal¹,

Bibi²,

Hyder³

et al. 2022

Beilstein J. Nanotechnol.

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“…CQDs have been synthesized through hydrothermal process from rice husks [59]. Using Ethylenediamine (EDA) and ascorbic acid as functionalization agents to produce amino and carboxyl functionalized CQDs.…”

Section: Carbon Quantum Dots For Removal Of Pollutantsmentioning

confidence: 99%

Water Purification by Carbon Quantum Dots

Sridharan

Ilango

Samuel³

2021

Inorganic-Organic Composites for Water and Wastewater Treatment

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Sustainable, sufficient and pure water is vital on earth at present. Of all processes used to purify water, nanotechnology plays an important role. Nanomaterials are available in all stages like membranes in filtration, adsorbents of pollutants, photocatalysts for degradation and for detection of pollutants in water purification. Carbon quantum dots (CQDs), an accidentally invented nanomaterial, like in many applications have supported in water purification in all stages. Hence, it is intended for a mini-review for the water purification techniques with carbon quantum dots (CQDs). The chapter consists of three parts. Many nanotechnological methods are employed in water purification. Among them, nanomembranes play a dominant role in detection, nanofiltration and degradation in water purification. Next, nanomaterials as adsorbents, sensors and photocatalytic activity for water remediation are being investigated largely. Hence, they are discussed in the first part. In the second part, the features of CQDs are considered for its versatile applications. The easy and low-cost preparation of CDQs from easily available materials are investigated from the research published articles. In the third part, an attempt is made to collectively analyze the CQDs contributions as membranes in water purification, to detect the presence of organic, inorganic and dye contamination from water is reviewed. Further, the removal of the harmful and or toxic elements from polluted and impure water is discussed from various research groups.

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“…CQDs is an attractive nanomaterial with good chemical and optical stability, high specific surface area, and excellent adsorption capability (Chung Hui et al, 2021;Liu et al, 2017b;Yahaya Pudza et al, 2020;. The adsorption performance of CQDs has been tested for the removal of heavy metals such as cadmium and lead also for the removal of cationic dyes in the form of composites (de Oliveira et al, 2020;Yahaya Pudza et al, 2020;Yang et al, 2019;Yin et al, 2020;Zainal Abidin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Modification of Kaolin with Carbon Quantum Dots as Composite for Methylene Blue Removal: Literature Review and Experiment

Sambudi

Sithambaran

Hui

et al. 2022

Indonesian J. Sci. Technol

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The modification of kaolin with nano-size fillers has exhibited excellent performance in the adsorption process. Carbon quantum dots (CQDs) are the new generation of nanoparticles that have attracted interest for their utilization as modifiers. In this study, a composite of metakaolin(MK)/CQDs was synthesized and tested for methylene blue (MB) removal. The heating and acid-alkali treatment of kaolin transformed it into MK. The interaction between MK and CQDs was analyzed using XPS to detect the binding of pyridic NH2 and C-N. By loading CQDs into the kaolin matrix, the surface area was improved and the removal of MB increased. For a lower MB concentration at 5 ppm, the removal efficiency could reach 96%. The composite exhibited good regeneration through the recyclability test.

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The effect of functionalization on rice-husks derived carbon quantum dots properties and cadmium removal

Cited by 40 publications

References 55 publications

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

Water Purification by Carbon Quantum Dots

Modification of Kaolin with Carbon Quantum Dots as Composite for Methylene Blue Removal: Literature Review and Experiment

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