Heteroatom Modified Hybrid Carbon Quantum Dots Derived from Cucurbita pepo for the Visible Light Driven Photocatalytic Dye Degradation

Smrithi, S. P.; Kottam, Nagaraju; Vergis, Bincy Rose

doi:10.1007/s11244-022-01581-x

Cited by 18 publications

(9 citation statements)

References 69 publications

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“…76 thermal synthesis of N-CQDs from Cucurbita pepo extract. The as-fabricated N-CQDs showed almost complete photocatalytic eradication of crystal violet dye in 3 h. 77…”

Section: Photocatalytic Activitymentioning

confidence: 91%

“…The FRET mechanism involves the transfer of non-radiative energy between C-dots and an energy acceptor, such as a quencher, that is located within 10 nm to 100 nm. 76,77 FRET takes place between a quencher in the ground state and C-dots in the excited state. 121 Also, the absorption spectrum of the quencher overlaps with the emission spectrum of C-dots.…”

Section: Mechanism Of Energy Transfermentioning

confidence: 99%

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Assessment of biomass-derived carbon dots as highly sensitive and selective templates for the sensing of hazardous ions

et al. 2023

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“…76 thermal synthesis of N-CQDs from Cucurbita pepo extract. The as-fabricated N-CQDs showed almost complete photocatalytic eradication of crystal violet dye in 3 h. 77…”

Section: Photocatalytic Activitymentioning

confidence: 91%

Section: Mechanism Of Energy Transfermentioning

confidence: 99%

Assessment of biomass-derived carbon dots as highly sensitive and selective templates for the sensing of hazardous ions

et al. 2023

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“…The average crystalline particle size of CQDs is calculated using the relation expressed in Equations ( 1) and (2). The crystal structure diffraction is based on Wulf-Bragg's law shown in Equation (1) [27].…”

Section: Characterization Methodsmentioning

confidence: 99%

Effect of Hydrothermal Reaction Temperature on Fluorescent Properties of Carbon Quantum Dots Synthesized from Lemon Juice for Adsorption Applications

Deme

Gemta

Andoshe

et al. 2023

Journal of Nanomaterials

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Photoluminescent carbon quantum dots (CQDs) were synthesized from lemon juice precursors via single-step, hydrothermal techniques under different temperatures to control the optical properties. The synthesized CQDs were characterized by PL, illuminated UV analyzer chamber, UV–vis spectroscopy, X-ray diffractometer, Fourier-transformed infrared spectrophotometry, and zeta potential techniques. The results show that the synthesized CQDs had an excellent blue–green emission extending up to the infrared region with high quantum yield (Φ) in the range of 14%–41%. The effect of reaction temperature and the aging of CQDs on the emission spectra of CQDs are also investigated. Furthermore, the adsorption effect of the synthesized CQDs was evaluated on methylene blue (MB) dyes. The result indicated the synthesized CQDs have excellent adsorbent properties with a removal efficiency of 60%–82% and an extremely fast adsorption rate of 6 × 10−2 min−1 for MB dyes.

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“…Additionally, the EDX mapping results showed that the dominating features on the surface of QDs were a broad uniform distribution of carbon and oxygen elements, showing that a more significant composition of wt% carbon with 72.4% compared to oxygen elements, with only 23.6%. Due to the increased propensity for more broken bonds to exist in the interfacial area, an adsorbent with an oxygen element content that is noticeably higher than average will increase in adsorption effectiveness [28,29]. The high proportion of oxygen atoms in the QDs caused it to be extensively oxidised, producing additional active sites on its surface.…”

Section: Characterizationmentioning

confidence: 99%

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

Nizam

Hanafiah

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon-based nanomaterials are currently gaining attention in wastewater treatment. They have gained a prime position in membrane filtration to degrade pollutants. One of the most recent additions to the field of carbon-based nanomaterials is quantum dots (QDs). Due to their exceptional qualities, QDs are among the most promising carbon-based nanomaterials at the forefront of the wastewater treatment research field. Nonetheless, most quantum dots were not sustainably fabricated. Therefore, this study aims to evaluate the carbon-based carbon quantum dots derived from biomass wastes (rubber seed shells) where the properties, behaviour and photoluminescence characteristics were evaluated through several characterization analyses. The QDs were characterized using Fourier-transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), photoluminescence spectroscopy, zeta potential analyser and Raman spectroscopy. The morphological analysis revealed multi-layered planes with highly porous and uneven surfaces, consisting of a large number of oxygen-functional groups (hydroxyl, carboxyl, carbonyl). The mapping results showed a large uniform distribution of carbon and oxygen elements on the surface of QDs with a more signified composition of wt% carbon (72.4%) compared to oxygen elements, with 23.6%. The spectroscopic and photoluminescence studies confirmed the fabrication of high-quality carbon quantum dots with blue-greenish fluorescence emissions. These results have shown promising biomass-based QDs that can be applied in wastewater treatment based on their unique characteristics. Thus, the derived biomass-based QDs can be viewed as a promising and cost-effective adsorbent for wastewater and water treatment.

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Heteroatom Modified Hybrid Carbon Quantum Dots Derived from Cucurbita pepo for the Visible Light Driven Photocatalytic Dye Degradation

Cited by 18 publications

References 69 publications

Assessment of biomass-derived carbon dots as highly sensitive and selective templates for the sensing of hazardous ions

Assessment of biomass-derived carbon dots as highly sensitive and selective templates for the sensing of hazardous ions

Effect of Hydrothermal Reaction Temperature on Fluorescent Properties of Carbon Quantum Dots Synthesized from Lemon Juice for Adsorption Applications

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

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