Coal tar pitch as natural carbon quantum dots decorated on TiO2 for visible light photodegradation of rhodamine B

Zhang, Jingjie; Liu, Quanrun; He, He; Shi, Feng; Huang, Guangxu; Xing, Baolin; Jia, Jianbo; Zhang, Chuanxiang

doi:10.1016/j.carbon.2019.06.034

Cited by 86 publications

(38 citation statements)

References 71 publications

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“…However, this does not mean that solvothermal method is not suitable for the preparation of biomass carbon dots. Using scindapsus leaves [ 82 ] (Figure 3A) and coal tar pitch [ 83 ] (Figure 3B) as carbon sources, ethanol and DMF were used as solvents to perform solvothermal reactions to obtain CQDs with quantum sizes of 2–6 nm and 5.17 ± 0.95 nm, respectively. Li et al.…”

Section: Carbon Source and Synthesis Methods Of Biomass Carbon Dotsmentioning

confidence: 99%

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Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

et al. 2021

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Carbon dots have attracted much attention due to their high fluorescence intensity, easy modification, good stability, and biocompatibility. However, the realization of low‐cost mass production of high‐quality carbon dots still faces great challenges. Biomass is of non‐toxic and environmentally friendly organism, but a lot of biomass is treated as waste for burning and landfill at present, causing irreparable pollution to the environment. In fact, many biomass resources are ideal candidates for preparing carbon dots. This review focuses on carbon dots including carbon quantum dots (CQDs) and graphene quantum dots (GQDs) which using biomass as carbon source on the aspects of plants and their derivatives, animals and their derivatives and municipal waste. The characterization of the structure and composition of biomass carbon dots, the regulation of fluorescence color and the methods of improving quantum yield (QY) including heteroatom doping and surface modification are introduced in detail. Moreover, biomass carbon dots for detecting metal ions and non‐metal molecules and their quenching mechanism are emphatically introduced in addition to summarizing the luminescence mechanism, and some promising prospects and challenges in this uplifting field are discussed.

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Section: Carbon Source and Synthesis Methods Of Biomass Carbon Dotsmentioning

confidence: 99%

Section: Carbon Source and Synthesis Methods Of Biomass Carbon Dotsmentioning

confidence: 99%

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

et al. 2021

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“…Recently, Liu and co‐workers had successfully prepared an efficient, reusable and stable CTP/TiO 2 composite photocatalyst from CTP by a simple and environmental friendly one‐step solvothermal method (Figure 11). [ 105 ] The CTP/TiO 2 nanocomposites had a relatively uniform shape with an average size of 5.17 ± 0.95 nm, the degradation efficiency of CTP/TiO 2 nanocomposites increased from 41.0% to 91.1% with the content of CTP varied from 1% to 5%, and the photocatalytic degradation rate of CTP/TiO 2 nanocomposites was 23 times higher than that of pure TiO 2 at the optimum content of CTP. The possible chemical reactions during the degradation of Rhodamine B (RhB) were as follows:

CTP / Ti {normalO}_{2} + normalh ν \to {normale}^{-} + {normalh}^{+}

{normalH}_{2} O + {normalh}^{+} \to {normalH}^{+} + \cdot OH

{normalO}_{2} + {normale}^{-} \to \cdot {normalO}_{2}^{-}

\cdot {normalO}_{2}^{-} + 2 {normalH}^{+} + {normale}^{-} \to {normalH}_{2} {normalO}_{2}

{normalH}_{2} {normalO}_{2} + {normale}^{-} \to \cdot OH + O {normalH}^{-}

{normalH}_{2} O \to {normalH}^{+} + O {normalH}^{-}

O {normalH}^{-} + {normalh}^{+} \to \cdot OH

\cdot OH + RhB \to C {normalO}_{2} + {normalH}_{2} O

…”

Section: Applications Of Coal‐based Cdsmentioning

confidence: 99%

Coal based carbon dots: Recent advances in synthesis, properties, and applications

Liu

Zhang

et al. 2021

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Carbon dots are zero‐dimensional carbon nanomaterials with quantum confinement effects and edge effects, which have aroused great interests in many disciplines such as energy, chemistry, materials, and environmental applications. They can be prepared by chemical oxidation, electrochemical synthesis, hydrothermal preparation, arc discharge, microwave synthesis, template method, and many other methods. However, the raw materials' high cost, the complexity and environmental‐unfriendly fabrication process limit their large‐scale production and commercialization. Herein, we review the latest developments of coal‐based carbon dots about selecting coal‐derived energy resources (bituminous coal, anthracite, lignite, coal tar, coke, etc.) the developments of synthesis processes, surface modification, and doping of carbon dots. The coal‐based carbon dots exhibit the advantages of unique fluorescence, efficient catalysis, excellent water solubility, low toxicity, inexpensive, good biocompatibility, and other advantages, which hold the potentiality for a wide range of applications such as environmental pollutants sensing, catalyst preparation, chemical analysis, energy storage, and medical imaging technology. This review aims to provide a guidance of finding abundant and cost‐effective precursors, green, simple and sustainable production processes to prepare coal‐based carbon dots, and make further efforts to exploit the application of carbon dots in broader fields.

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“…6 In addition, CDs also have the property of photothermal stability, good photoelectric, easy functionalization, environmental friendliness, a wide range of carbon sources, and so on. The CDs have become a research hotspot for applications in bio-imaging, [7][8][9] solar cells, 10,11 photocatalysis, [12][13][14][15] light-emitting diodes, [16][17][18][19] biomedicine, [20][21][22] fluorescence sensing, [23][24][25][26] electrochemistry, 27,28 energy storage, [29][30][31] and anticounterfeiting, [32][33][34] which is due to these excellent properties of CDs. Particularly, for the CDs showed excellent advantages of fast response, high spatial resolution, and safety of remote handling, more and more scholars used CDs as a sensor for highly sensitive and selective detection of metal ions, pH, temperature, and reactive oxygen species.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of blue‐green emitting carbon dots based on the liquid products of biodegradation of coal

et al. 2021

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The liquid products of biodegradation of coal (LPBC) without further separation and purification are generally difficult to apply. In this study, a simple and low-cost method had been described for the preparation of carbon dots (CDs) by hydrothermal treatment of original LPBC. The as-synthesized CDs scence emission intensity when possessed narrowly distributed sizes and a mean diameter of 3.5 nm, and they showed significant excitation-dependent fluorescence emission. Meanwhile, the CDs exhibited good water solubility and photo-, metal ions-stability. Furthermore, the fluorescent emission intensity of CDs had been demonstrated sensitivity to pH value and temperature, showing great promise in sensor application.

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Coal tar pitch as natural carbon quantum dots decorated on TiO2 for visible light photodegradation of rhodamine B

Cited by 86 publications

References 71 publications

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

Recent advances of biomass carbon dots on syntheses, characterization, luminescence mechanism, and sensing applications

Coal based carbon dots: Recent advances in synthesis, properties, and applications

Hydrothermal synthesis of blue‐green emitting carbon dots based on the liquid products of biodegradation of coal

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