Fluorescence and photocatalytic activity of metal-free nitrogen-doped carbon quantum dots with varying nitrogen contents

Hu, Yingying; Guan, Rentian; Zhang, Cong; Zhang, Keying; Liu, Wenjing; Shao, Xiaodong; Xue, Qingwang; Yue, Qiaoli

doi:10.1016/j.apsusc.2020.147344

Cited by 45 publications

(12 citation statements)

References 44 publications

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“…With increasing catalyst loading, the photodegradation efficiency increases as the effective surface area increases. So, we performed all the experiments with a dye concentration of 60 mg L –1 and 0.5 mg/mL loading of MFP-CdS in the presence of sunlight …”

Section: Resultsmentioning

confidence: 99%

Melamine–Formaldehyde Polymer-Based Nanocomposite for Sunlight-Driven Photodegradation of Multiple Dyes and Their Mixture

et al. 2023

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Cadmium sulfide (CdS)-decorated, cross-linked melamine–formaldehyde polymer-based nanocomposite (MFP-CdS) has been synthesized. MFP-CdS is utilized here as a photoactive material for the photodegradation of six model organic dyes and their mixture in an aqueous medium in the presence of sunlight. The half-life values from the kinetic study of multiple dyes strongly support the importance of sunlight on the fast degradation of all six dyes compared to bulb light and control (dark) conditions. A comparative 1H NMR analysis of the dyes and their degraded products has been performed to support the breakdown of the aromatic framework of organic dyes using MFP-CdS in sunlight. The mechanisms involved in the photodegradation of dyes have been investigated based on radical trapping studies that support the significant involvement of superoxide radicals along with holes. Moreover, the dye removal efficiency using MFP-CdS from real industrial wastewater samples is evaluated via the external spiking of organic dyes and their mixture in unknown industrial effluents where they showed similar photodegradation results. Based on the high recyclability of MFP-CdS, these are used for multiple cycles.

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Section: Resultsmentioning

confidence: 99%

Melamine–Formaldehyde Polymer-Based Nanocomposite for Sunlight-Driven Photodegradation of Multiple Dyes and Their Mixture

et al. 2023

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“…Which may be due to agglomeration of catalyst at high dose photon absorption is reduced, resulting in the lesser degree of generation of active radical species in the IC solution, which degrades the IC. As a result, 0.3 mg/mL was chosen as the most efficient catalyst dose for photodegradation of IC. , …”

Section: Resultsmentioning

confidence: 99%

Cadmium-Sulfide Doped Carbon Nanoflakes Used for Sunlight-Assisted Selective Photodegradation of Indigo Carmine

et al. 2022

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Herein, we have fabricated cadmium-sulfide (CdS)-doped glucose-derived carbon nanoflakes (CNF) via a simple two-step methodology. The as-prepared CdS-doped CNF (CdS-CNF) shows selective photocatalytic activity toward the degradation of organic dye named Indigo Carmine (IC) from the tested nine model organic dyes importantly under the influence of sunlight. The viability of sunlight-promoted photodegradation was supported via comparative half-life (t 1/2) values, which is ∼14 min–1 for sunlight compared to ∼125 min–1 for artificial bulb light. The photodegradation of IC follows pseudo-first-order kinetics, and the rate associated with the sunlight-promoted photodegradation is ∼8 times faster compared to the reaction under artificial bulb light. Based on the trap experiments, the photocatalytic degradation mechanism showed the involvement of superoxide radicals. The photodegradation results are supported via a comparative proton nuclear magnetic resonance and Fourier transform infrared spectroscopic analysis. Additionally, CdS-CNF is used to degrade IC dye from industrially spiked wastewater samples to demonstrate its potential as a photocatalyst for real-life applications.

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“…150 Hu et al synthesized N-CQD (N-CQD) using different precursors with varying nitrogen contents and used in photocatalytic degradation of organic dyes such as indigo carmine (IC), ethyl violet (EV), CR, and bordeaux R (Bo-R). The degradation efficiency was 97% for IC under natural light for 2 h. 151 Chen et al developed a novel CQD modified potassium titanate nanotube (CQD/K 2 Ti 6 O 13 ) composite photocatalyst through hydrothermal treatment followed by calcination. The composite showed high degradation efficiency of degradation of amoxicillin (AMX) through photocatalysis under both UV and visible light irradiations.…”

Section: Photocatalytic Applicationsmentioning

confidence: 99%

Visible-Light-Promoted Photocatalytic Applications of Carbon Dots: A Review

Saini

Garg

Dalal

et al. 2022

ACS Appl. Nano Mater.

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The same carbon-based nanomaterials have shown their potential photocatalytic applications toward environmental and energy-related problems based on their excellent light absorption abilities. Herein, we summarized the findings associated with visible light and sunlight-induced photocatalysis, specifically using carbon dots (CD), doped-CD, and their nanocomposite as an advanced photocatalytic material. Doped-CD and CD-based composite have improved light absorption abilities compared to bare CD, which is the essential parameter for photocatalysis applications. Various parameters, such as fabrication methodologies, efficiency, and stability, have also been discussed. The possible mechanistic insights involving the photocatalysis method applied in multiple chemical reactions have been discussed in detail, including degradation of organic dye, reduction of higher toxic oxidation states of metal ions, CO 2 conversion, water splitting, organic transformation reaction, and NOx removal, etc.

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Fluorescence and photocatalytic activity of metal-free nitrogen-doped carbon quantum dots with varying nitrogen contents

Cited by 45 publications

References 44 publications

Melamine–Formaldehyde Polymer-Based Nanocomposite for Sunlight-Driven Photodegradation of Multiple Dyes and Their Mixture

Melamine–Formaldehyde Polymer-Based Nanocomposite for Sunlight-Driven Photodegradation of Multiple Dyes and Their Mixture

Cadmium-Sulfide Doped Carbon Nanoflakes Used for Sunlight-Assisted Selective Photodegradation of Indigo Carmine

Visible-Light-Promoted Photocatalytic Applications of Carbon Dots: A Review

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