Facile preparation of carbon quantum dots/TiO2 composites at room temperature with improved visible-light photocatalytic activity

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

doi:10.1016/j.jallcom.2021.159389

Cited by 34 publications

(10 citation statements)

References 53 publications

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“…In this regard, coal tar pitch (CTP), one of the byproducts of coal tar processing, is considered to be an ideal candidate precursor for preparing GQDs since the molecular of CTP has great similarity to that of GQDs. In our previous work, we prepared CTP/TiO 2 and Fe 3 O 4 @CTP QDs composites in a simple way and employed them as photocatalysts and anode materials for LIBs, respectively, and the CTP can be thought of as ″natural GQDs″. − Similarly, the introduction of the above perception into the FeS-based anode material system may eliminate its drawbacks in terms of lithium storage.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of an FeS@GQDs Composite for Lithium Storage with Coal Tar Pitch as ″Natural GQDs″

et al. 2022

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Graphene quantum dots (GQDs), a newly emerging zero-dimensional material, have achieved widespread interest in energy storage applications. However, the complicated preparation processes of GQDs involving harsh reagents/conditions, cumbersome purification procedures, or costly precursors hinder their practical use. Herein, we reveal a low-cost and eco-friendly solvothermal method to obtain an FeS@GQDs composite, with coal tar pitch (CTP) as ″natural GQDs″. When evaluated as an anode material in lithium-ion batteries (LIBs), this composite delivers an outstanding reversible capacity of 718.7 mAh g–1 over 200 cycles at 100 mA g–1; as comparison, the reversible capacity of pure FeS is only 16.3 mAh g–1 in the same situation. Furthermore, the FeS@GQDs composite shows much better rate performance and higher initial Coulombic efficiency than pure FeS. These prominent electrochemical properties of the FeS@GQDs composite profit from the successful coupling between FeS and GQDs by forming C–S–C, which provides a large specific surface area and well-developed porosity, leading to improved electrical conductivity and enhanced structure stability. In terms of energy storage, this approach is a potential way to prepare GQDs-based composites on a large scale without the expensive precursors, harsh reagents, as well as complex preparation conditions.

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Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of an FeS@GQDs Composite for Lithium Storage with Coal Tar Pitch as ″Natural GQDs″

et al. 2022

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“…68 (c) Cycle degradation efficiency (%) of CTP/TiO 2 -5 composite. 71 (d) Schematic energy level diagrams of CDs@Ag 3 PO 4 , CDs@ Ag 3 PO 4 -1, CDs@Ag 3 PO 4 -2, and Ag 3 PO 4 in comparison with the potential for HO /OH À . 84 Reprinted with permission from ref.…”

Section: Coal-based Cds For Photocatalysismentioning

confidence: 99%

Application of coal-based carbon dots for photocatalysis and energy storage: a minireview

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“…The synthesized composites showed a red-shift of the band gap (2.08–2.30 eV) with their efficiency to convert the ultraviolet light to current upon utilization as photoanodes. Zhang et al fabricated composites of titanium dioxide with CQDs by impregnation at room temperature, with the dots derived from coal tar pitch [ 95 ]. The composite with the optimum amount of carbon dots (6 wt.%) showed by far the highest visible-light photo-assisted decomposition of rhodamine B (RhB) dye, with the rate of degradation to be 43.7 times higher comparing to pure TiO 2 .…”

Section: Photo- and Sono-catalytic Selective Oxidation Of Hmf And Dec...mentioning

confidence: 99%

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

et al. 2022

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The continuous increase of the demand in merchandise and fuels augments the need of modern approaches for the mass-production of renewable chemicals derived from abundant feedstocks, like biomass, as well as for the water and soil remediation pollution resulting from the anthropogenic discharge of organic compounds. Towards these directions and within the concept of circular (bio)economy, the development of efficient and sustainable catalytic processes is of paramount importance. Within this context, the design of novel catalysts play a key role, with carbon-based nanocatalysts (CnCs) representing one of the most promising class of materials. In this review, a wide range of CnCs utilized for biomass valorization towards valuable chemicals production, and for environmental remediation applications are summarized and discussed. Emphasis is given in particular on the catalytic production of 5-hydroxymethylfurfural (5-HMF) from cellulose or starch-rich food waste, the hydrogenolysis of lignin towards high bio-oil yields enriched predominately in alkyl and oxygenated phenolic monomers, the photocatalytic, sonocatalytic or sonophotocatalytic selective partial oxidation of 5-HMF to 2,5-diformylfuran (DFF) and the decomposition of organic pollutants in aqueous matrixes. The carbonaceous materials were utilized as stand-alone catalysts or as supports of (nano)metals are various types of activated micro/mesoporous carbons, graphene/graphite and the chemically modified counterparts like graphite oxide and reduced graphite oxide, carbon nanotubes, carbon quantum dots, graphitic carbon nitride, and fullerenes.

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Facile preparation of carbon quantum dots/TiO2 composites at room temperature with improved visible-light photocatalytic activity

Cited by 34 publications

References 53 publications

One-Pot Synthesis of an FeS@GQDs Composite for Lithium Storage with Coal Tar Pitch as ″Natural GQDs″

One-Pot Synthesis of an FeS@GQDs Composite for Lithium Storage with Coal Tar Pitch as ″Natural GQDs″

Application of coal-based carbon dots for photocatalysis and energy storage: a minireview

Carbon-Based Nanocatalysts (CnCs) for Biomass Valorization and Hazardous Organics Remediation

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