Photocatalytic materials modified with carbon quantum dots for the degradation of organic pollutants under visible light: A review

Mei, Aoxue; Xu, Zhengfu; Wang, Xiyuan; Liu, Yuying; Chen, Jiao; Fan, Jingbiao; Shi, Qingdong

doi:10.1016/j.envres.2022.114160

Cited by 55 publications

(15 citation statements)

References 60 publications

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“…The frequent detection of organic pollutants in environmental media due to the rapid advancement of industrial technology has raised numerous concerns [1,2]. Among the techniques used for the removal of organic pollutants from water, e.g., adsorption, catalytic degradation, and biodegradation [3], photocatalytic degradation is one of the most effective techniques, considering the mild operational conditions, high reaction rate, and excellent efficiency [4]. However, most conventional photocatalytic materials used for wastewater treatment, e.g., TiO 2 [5], ZnO [6], CdS [7], and WO 3 [8], are impractical because of their large band gaps and the resulting inability to directly adsorb and utilise visible light [9].…”

Section: Introductionmentioning

confidence: 99%

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Li¹,

Liu²,

et al. 2023

Mater. Res. Express

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Owing to their advantageous physical, chemical, electronic, and optical properties, two-dimensional (2D) materials are widely used as highly active visible-light photocatalysts. In this study, 3D/2D composite photocatalysts were prepared from ammonium phosphotungstate nanoparticles and 2D ultrathin graphitic carbon nitride by an impregnation method and were found to efficiently promote the photodegradation of rhodamine B and tetracycline in water under visible light irradiation. Photocatalytic degradation was maximum at a PW12NH4 loading of 20 wt% (UCN20), with photodegradation efficiencies of 93.40% and 69.6% for RhB and TC, respectively. The photocatalytic degradation rate using UCN20 was 5.8-fold higher for RhB and 2.2-fold higher for TC compared to those with UCN. This high performance is ascribed to the large specific surface areas and pore volumes of the composites and the reduced probability of photogenerated carrier recombination therein. The related degradation mechanism is believed to involve a Z-scheme charge transfer mode, which enhances the redox capability of composite photocatalysts and renders them suitable for the visible light-driven remediation of wastewater containing organic contaminants.

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Section: Introductionmentioning

confidence: 99%

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Li¹,

Liu²,

et al. 2023

Mater. Res. Express

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“…One of the possible reasons is the low photon energy from infrared light can be hardly used to directly initiate chemical reactions over photocatalysts, resulting in a large waste of light energy (more than 50%). On the other hand, most photocatalysts can only respond to ultraviolet and visible light due to the limitation of their energy band structures . It would therefore be helpful for future research to focus on broadening the infrared light absorption of catalysts.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress on Photocatalytic CO₂ Conversion Reactions over Plasmonic Metal-based Catalysts

Lei

et al. 2023

ACS Catal.

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The massive consumption of fossil energy leads to excessive emissions of CO2, which has caused global warming. Solar-driven CO2 conversion is a promising avenue that could solve the energy crisis and environmental pollution issues simultaneously. For photocatalytic CO2 conversion reactions, several photocatalysts have been developed such as semiconductors and plasmonic metal-based catalysts. Among them, plasmonic metal-based catalysts have attracted extensive attention due to their strong light harvesting capacities and low electron–hole pair recombination rates, which are beneficial for photocatalytic CO2 conversion. This review summarizes the progress of plasmonic metal-based catalysts in CO2 reduction with H2, CH4, H2O, and organic chemicals and generalizes the mechanism of plasmonic metal-based catalysts in CO2 conversion reactions.

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“…Recently, carbon dots (CDs) have received remarkable attention in optoelectronic devices, − bioimaging, − catalysis, − sensing, − and anti-counterfeiting − due to the fascinating merits of good photostability, low cytotoxicity, and excellent biocompatibility. Regarding their luminescent properties, highly emissive CDs with a large fluorescence quantum yield have been successfully fabricated, but most of them showed relatively short excitation/emission wavelengths, usually ranging from blue and green to a yellowish color.…”

Section: Introductionmentioning

confidence: 99%

Versatile Red-Emissive Carbon Dots for Smart Textiles and Fluorescence Sensing

Jia

Zhang

2023

ACS Appl. Nano Mater.

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Red-emissive carbon dots (RCDs) were facilely synthesized from o-phenylenediamine and catechol in ethanol through a hydrothermal method. The produced RCDs showed a triplet fluorescence emission around 597, 647, and 707 nm, respectively. The eco-friendly fluorescent pigment was prepared by dispersing RCDs into poly(vinylpyrrolidone) for smart textiles. Bright and stable fluorescent patterns on the cotton fabrics were successfully created by a screen-printing technique. Based on the pH-sensitive color change of RCDs, reversible volatile acid/amine-responsive RCD-patterned smart textiles and paper indicators were also constructed, respectively. Furthermore, fluorescence-sensing platforms were developed for MnO4 – using an inner-filter-effect approach. It was found that the present RCDs could be used for the quantitative detection of MnO4 – in the range of 0–7 μM in aqueous solution and for practical water sample analysis with satisfactory recovery results.

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Photocatalytic materials modified with carbon quantum dots for the degradation of organic pollutants under visible light: A review

Cited by 55 publications

References 60 publications

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Recent Progress on Photocatalytic CO₂ Conversion Reactions over Plasmonic Metal-based Catalysts

Versatile Red-Emissive Carbon Dots for Smart Textiles and Fluorescence Sensing

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Photocatalytic materials modified with carbon quantum dots for the degradation of organic pollutants under visible light: A review

Cited by 55 publications

References 60 publications

Ammonium phosphotungstate nanoparticle/ultrathin g-C3N4 composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Ammonium phosphotungstate nanoparticle/ultrathin g-C3N4 composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Recent Progress on Photocatalytic CO2 Conversion Reactions over Plasmonic Metal-based Catalysts

Versatile Red-Emissive Carbon Dots for Smart Textiles and Fluorescence Sensing

Contact Info

Product

Resources

About

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Ammonium phosphotungstate nanoparticle/ultrathin g-C₃N₄ composite photocatalysts with Z-scheme heterojunctions: preparation and application to organic contaminant degradation

Recent Progress on Photocatalytic CO₂ Conversion Reactions over Plasmonic Metal-based Catalysts